阅读说明：本技术 光纤通信系统及在其内进行动态功率优化的方法 (Optical fiber communication system and method for dynamic power optimization therein ) 是由 李岳儒 刘书贤 吴敬平 李少华 于 2020-04-10 设计创作，主要内容包括：本发明提供一种光纤通信系统及在其内进行动态功率优化的方法,该光纤通信系统包含第一和第二光学收发器。第一光学收发器首先以具有初始值的光传送功率来传递信号至第二光学收发器的情况下。当实际输入第二光学收发器的光接收功率的值大于第二光学收发器的预期输入功率的值时,依据光接收功率和预期输入功率的值求出功率差异值。第一光学收发器依据功率差异值来调整其光传送功率,再以调整后的光传送功率来传递信号至第二光学收发器。(The invention provides a fiber optic communication system and a method for dynamic power optimization therein. The first optical transceiver first transmits a signal to the second optical transceiver with an optical transmission power having an initial value. And when the value of the light receiving power actually input into the second optical transceiver is larger than the value of the expected input power of the second optical transceiver, calculating a power difference value according to the values of the light receiving power and the expected input power. The first optical transceiver adjusts the optical transmission power according to the power difference value, and transmits a signal to the second optical transceiver according to the adjusted optical transmission power.)

1. A method for dynamic power optimization in a fiber optic communication system, comprising:

a first optical transceiver in the optical fiber communication system sends a power calibration request packet to a second optical transceiver in the optical fiber communication system with an optical transmission power having an initial value;

when the value of the light receiving power actually input into the second optical transceiver is larger than the value of the expected input power of the second optical transceiver, calculating a power difference value according to the values of the light receiving power and the expected input power;

adjusting the optical transmission power according to the power difference value; and

the first optical transceiver transmits a signal to the second optical transceiver with the adjusted optical transmission power.

2. The method of claim 1, further comprising:

after receiving the power calibration request packet, the second optical transceiver sends a power calibration backhaul packet including the optical receive power and the expected input power to the first optical transceiver; and

when the first optical transceiver determines that the value of the optical receiving power is greater than the value of the expected input power, the power difference value is calculated according to the values of the optical receiving power and the expected input power.

3. The method of claim 1, further comprising:

after receiving the power calibration request packet, the second optical transceiver calculates the power difference value according to the values of the optical receiving power and the expected input power;

the second optical transceiver transmitting a power calibration backhaul packet including the power difference value to the first optical transceiver; and

when the first optical transceiver determines whether the value of the optical receiving power is larger than the value of the expected input power according to the power difference value.

4. The method of claim 1, further comprising:

adjusting the optical transmission power from the initial value to a first adjustment value, wherein the first adjustment value is the initial value minus the power difference value;

after adjusting the optical transmission power from the initial value to the first adjustment value, the first optical transceiver determines whether the optical transmission power with the first adjustment value can pass a verification procedure;

when it is determined that the optical transmission power with the first adjustment value can pass the verification procedure and it is determined that the optical transmission power with the first adjustment value is not greater than a maximum optical transmission power value of the first optical transceiver, the first optical transceiver transmits signals to the second optical transceiver with the optical transmission power with the first adjustment value.

5. The method of claim 4, further comprising:

when the optical transmission power with the first adjustment value is determined to fail the verification procedure, adjusting the optical transmission power from the first adjustment value to a second adjustment value, wherein the second adjustment value is greater than the first adjustment value; and

when it is determined that the optical transmission power having the second adjustment value can pass the verification procedure, the first optical transceiver transmits a signal to the second optical transceiver at the optical transmission power having the second adjustment value.

6. The method of claim 5, further comprising:

when it is determined that the optical transmission power with the second adjustment value can pass the verification procedure and the optical transmission power with the second adjustment value is not greater than the maximum optical transmission power value, the first optical transceiver transmits a signal to the second optical transceiver at the optical transmission power with the second adjustment value; and

when the second adjustment value is larger than the maximum optical transmission power value, the first optical transceiver also sends out an online abnormity warning.

7. A fiber optic communication system, comprising:

a first optical transceiver, comprising:

a first transmitter optical subassembly for transmitting signals with an optical transmission power;

a first optical receive sub-module; and

a first power monitoring circuit for monitoring the operating status of the first optical transceiver;

a first calculation control unit for adjusting the value of the optical transmission power according to a power difference value;

a second optical transceiver, comprising:

a second transmitter optical subassembly;

the second optical receive submodule is used for receiving the signal transmitted by the first optical transmit submodule; and

a second power monitoring circuit for monitoring an optical reception power actually inputted to the second optical transceiver; and

a second operation control unit for:

determining whether the value of the optical receive power is greater than a value of an expected input power of the second optical transceiver; and

when it is determined that the value of the optical reception power is larger than the value of the expected input power, the optical reception power and the expected input power are supplied to find the power difference value.

8. A fiber optic telecommunications system according to claim 7, wherein:

the second operation control unit is further used for transmitting the values of the optical receiving power and the expected input power to the first optical receiving submodule when the value of the optical receiving power is judged to be larger than the value of the expected input power; while

The first arithmetic control unit is further configured to calculate the power difference value according to the values of the light receiving power and the expected input power.

9. A fiber optic communication system according to claim 7, wherein the second arithmetic control unit is further operable to:

when the light receiving power value is judged to be larger than the expected input power value, calculating the power difference value according to the light receiving power value and the expected input power value; and

and transmitting the power difference value to the first optical receive submodule.

10. A fiber optic communication system according to claim 7, wherein the first arithmetic control unit is further operable to:

adjusting the value of the optical transmission power from an initial value to a first adjustment value according to the power difference value, wherein the first adjustment value is the initial value minus the power difference value; and

instructing the first optical transceiver to transmit signals to the second optical transceiver with the optical transmit power having the first adjustment value when it is determined that the optical transmit power having the first adjustment value can pass a verification procedure and it is determined that the optical transmit power having the first adjustment value is not greater than a maximum optical transmit power value of the first optical transceiver.

11. A fiber optic communication system according to claim 10, wherein the first arithmetic control unit is further operative to:

when the optical transmission power with the first adjustment value is determined to fail the verification procedure, adjusting the value of the optical transmission power from the first adjustment value to a second adjustment value, wherein the second adjustment value is greater than the first adjustment value; and

instructing the first optical transceiver to transmit a signal to the second optical transceiver at the optical transmit power having the second adjustment value when it is determined that the optical transmit power having the second adjustment value can pass the verification procedure and it is determined that the optical transmit power having the second adjustment value is not greater than the maximum optical transmit power value.

Technical Field

The present invention relates to a method for performing dynamic power optimization in an optical fiber communication system and a related optical fiber communication system, and more particularly, to a method for performing dynamic power optimization in an optical fiber communication system according to a relationship between an actual input optical receive power and an expected input power at a receiving end and a related optical fiber communication system.

Background

With the popularity of networks, the dramatic growth in network capacity demand has prompted the development of fiber-optic communication (fiber-optical communication) technology. Optical fiber communication is a wired communication method for transmitting information by using optical signals and optical fibers, which has many advantages such as long-distance communication, high transmission capacity and high security, and has become the most dominant wired communication method in the present day.

Optical fiber communication systems are of various types, and the components therein are roughly classified into three main categories: the optical fiber and the optical cable, the optical active element and the optical passive element made of the optical fiber. In the architecture of the entire optical fiber communication system, the optical transceiver (transceiver) is an optical active device that integrates an optical transmitter (transmitter) and an optical receiver (receiver), and the optical transceiver at the transmitting end can convert an original electrical signal into an optical signal through electro-optical conversion for transmission. After reaching the target, the optical transceiver at the receiving end performs photoelectric conversion, and converts the optical signal back to the original electrical signal for application by other electronic devices.

The optical transceiver generally uses a light emitting device such as a Laser Diode (LD) or a Light Emitting Diode (LED) to provide an optical signal, and the operation performance of the light emitting device affects the electrical-to-optical conversion efficiency of the optical transceiver. In the application to an industrial environment at high temperature, the photoelectric conversion efficiency of the light emitting element may be deteriorated. In the application of the prior art, the optical transceiver outputs the maximum optical transmission power allowed by its specification, and if the optical transmission power of the optical transceiver can be reduced on the premise of normal communication, the operating current can be greatly reduced to reduce the waste heat generated in the electro-optical conversion process, thereby slowing the aging speed of the light emitting element and prolonging the service life.

Disclosure of Invention

To overcome the shortcomings of the prior art, the present invention provides an optical fiber communication system and a method for dynamic power optimization therein.

The present invention provides a method for dynamic power optimization in a fiber optic communication system. A first optical transceiver in the optical fiber communication system transmits signals to a second optical transceiver in the optical fiber communication system with an optical transmission power having an initial value. When a value of an optical receiving power actually input to the second optical transceiver is larger than a value of an expected input power of the second optical transceiver, a power difference value is obtained according to the value of the optical receiving power and the expected input power, and the optical transmission power is adjusted according to the power difference value, so that the first optical transceiver transmits signals to the second optical transceiver with the adjusted optical transmission power.

The invention also provides an optical fiber communication system, which comprises a first optical transceiver, a second optical transceiver, a first operation control unit and a second operation control unit. The first optical transceiver comprises a first transmitter optical sub-assembly (TOSA) for transmitting signals with an optical transmission power; a first receiver optical sub-assembly (ROSA); and a first power monitoring circuit for monitoring the operating status of the first optical transceiver. The first arithmetic control unit is used for adjusting the value of the optical transmission power according to a power difference value. The second optical transceiver comprises a second transmitter optical subassembly; the second optical receive submodule is used for receiving the signal transmitted by the first optical transmit submodule; and a second power monitoring circuit for monitoring an optical reception power actually inputted to the second optical transceiver. The second operation control unit is used for judging whether the value of the optical receiving power is larger than the value of an expected input power of the second optical transceiver; and when the value of the optical receiving power is judged to be larger than the value of the expected input power, providing the optical receiving power and the expected input power to obtain the power difference value.

The beneficial effects of the invention include: the invention can dynamically optimize the optical transmission power of the optical transceiver at the transmission end, thereby reducing the system power consumption under the condition of ensuring normal data.

Drawings

Fig. 1A is a functional block diagram of an optical fiber communication system according to an embodiment of the present invention.

Fig. 1B is a functional block diagram of an optical fiber communication system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram illustrating an implementation manner of a transmitting end driving circuit of each optical transceiver in an optical fiber communication system according to an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating waveforms of signals related to the operation of a transmitter driving circuit of each optical transceiver in an optical fiber communication system according to an embodiment of the present invention.

Fig. 4 is a schematic diagram illustrating a correlation between information monitored by each power monitoring unit in an optical fiber communication system according to an embodiment of the present invention.

Fig. 5 is a flowchart illustrating an operation of the optical fiber communication system according to the embodiment of the present invention.

Fig. 6 is a flowchart illustrating an operation of the optical fiber communication system according to the embodiment of the present invention.

The reference numerals are explained below:

10. 20: optical fiber

30A, 30B: transmission end drive circuit

40A, 40B: receiving end amplifying circuit

50A, 50B: power monitoring unit

60A, 60B arithmetic control unit

100A, 100B: optical transceiver

100. 200 optical fiber communication system

TOSA _ A, TOSA _ B: optical transmitter sub-module

ROSA _ A, ROSA _ B: optical receiving sub-module

TR: differential transistor pair

RB: balancing loads

RD: damping resistor

I_MOD: modulation current source

I_BIAS: bias current source

L_OUT: output electricityFeeling of

L_BIAS: bias inductor

V_IN: input voltage

CHR: characteristic curve of laser diode

TxP _ A: optical transmission power

RxP _ B: optical reception power

ExP _ B: expected input power

PL: path loss

P_IS: input sensitivity

PB: energy budget

500 to 580, 600 to 680: step (ii) of

Detailed Description

Fig. 1A is a functional block diagram of an optical fiber communication system 100 according to an embodiment of the present invention. Fig. 1B is a functional block diagram of an optical fiber communication system 200 according to an embodiment of the present invention. Fiber optic communication systems 100 and 200 each include a plurality of optical transceivers that transmit optical signals over optical fibers to each other. Each optical transceiver can convert the electrical signal into an optical signal by using a photoelectric effect and then transmit the optical signal to the other optical transceiver through an optical fiber; after each optical transceiver receives optical signals transmitted by other optical transceivers through optical fibers, the optical signals can be converted into electrical signals by utilizing a photoelectric effect, and then the electrical signals are used by other electronic equipment. For simplicity of illustration, fig. 1A and 1B illustrate two optical transceiver embodiments, however, the number of optical transceivers in the fiber optic communication system 100 or 200 is not limiting to the scope of the present invention.

The optical fiber communication systems 100 and 200 each include an optical transceiver 100A, an optical transceiver 100B, an arithmetic control unit 60A, an arithmetic control unit 60B, and two optical fibers 10 and 20. The optical transceiver 100A includes a transmission optical sub-assembly (TOSA _ a), a reception optical sub-assembly (ROSA _ a), a transmitter driver circuit 30A, a receiver amplifier circuit 40A, and a power monitoring unit 50A. The optical transceiver 100B includes a transmitter optical subassembly TOSA _ B, a receiver optical subassembly ROSA _ B, a transmitter driver circuit 30B, a receiver amplifier circuit 40B, and a power monitoring unit 50B. The TOSA _ a of the optical transceiver 100A may transmit an optical signal to the ROSA _ B of the optical transceiver 100B through the optical fiber 10, and the TOSA _ B of the optical transceiver 100B may transmit an optical signal to the ROSA _ a of the optical transceiver 100A through the optical fiber 20.

In the optical fiber communication system 100 shown in fig. 1A, the arithmetic control unit 60A is an element provided outside the optical transceiver 100A, and the arithmetic control unit 60B is an element provided outside the optical transceiver 100B. In the optical fiber communication system 200 shown in fig. 1B, the arithmetic control unit 60A is an element integrated within the optical transceiver 100A, and the arithmetic control unit 60B is an element integrated outside the optical transceiver 100B. However, the implementation of the arithmetic control units 60A and 60B does not limit the scope of the present invention.

The TOSAs _ a and TOSA _ B each include a light emitting element, a light detecting element, an optical mirror, etc., and are associated with a ceramic sleeve (not shown in fig. 1A and 1B), a sleeve (sleeve), a housing, a transistor-outer package (TO-Can), etc., or other mechanical components. In the optical transceivers 100A and 100B, the light emitting elements of the TOSA _ a and TOSA _ B can convert electrical signals into optical signals, and the optical signals are guided to corresponding optical fibers by the focusing element for transmission. In the embodiment of the present invention, the light emitting elements in the TOSA _ a and TOSA _ B may be laser diodes or light emitting diodes, such as Fabry-Perot (FP) laser diodes, Distributed Feedback (DFB) laser diodes, vertical-cavity surface-emitting laser (VCSEL) diodes, Fiber Bragg Grating (FBG) laser diodes, gallium arsenide (GaAs) light emitting diodes, or gallium arsenide phosphide (GaAsP) light emitting diodes, which provide optical signals with different tonality, operating wavelength, speed, and output power. However, the kind of the light emitting elements in the TOSA _ a and TOSA _ B does not limit the scope of the present invention.

The ROSA _ a and ROSA _ B each include a photodetector, a transimpedance amplifier, and an optical lens, and are associated with ceramic ferrules, sleeves, housings, and TO-Can, etc. (not shown in fig. 1A and 1B). In the optical transceivers 100A and 100B, the optical signals transmitted by the optical fibers can be guided by the optical mirrors to the optical detection elements of the ROSA _ a and ROSA _ B, so as to convert the optical signals into electrical signals. In the embodiment of the invention, the light detection elements in the ROSA _ a and ROSA _ B may be PN interface photodiodes (PIN photodiodes), Avalanche Photodiodes (APDs), or metal-semiconductor-metal (MSM) photodiodes. However, the type of the light detection elements in the ROSA modules ROSA _ a and ROSA _ B does not limit the scope of the present invention.

The transmitting-end driving circuits 30A and 30B may respectively provide driving signals required for the operation of the light emitting elements in the TOSA _ a and TOSA _ B, and the receiving-end amplifying circuits 40A and 40B may respectively amplify signals output by the operation of the light detecting elements in the ROSA _ a and ROSA _ B.

Fig. 2 is a schematic diagram of an implementation manner of a transmitting end driving circuit of each optical transceiver in the optical fiber communication system 100 or 200 according to the embodiment of the invention, which is not intended to limit the scope of the invention. Each transmitter driver circuit includes a differential transistor pair TR, a balanced load RB, and a modulation current source I_MODA bias current source I_BIASA damping resistor RD and an output inductor L_OUTAnd a bias inductor L_BIASCan be based on the input voltage V_INTo provide the driving current I required by the operation of the light-emitting device in the corresponding transmitter sub-module_LASERIn which I_LASER＝I_BIAS+I_MOD。

Fig. 3 is a schematic diagram of related signal waveforms when the transmitter driving circuit of each optical transceiver in the optical fiber communication system 100 or 200 operates according to an embodiment of the present invention. The embodiment of the OSA with the light emitting device as the laser diode is explained, the vertical axisRepresents the output power value of the TOSA, the horizontal axis represents the current value, CHR represents the characteristic curve of the laser diode, TxP represents the optical transmission power of the optical transceiver, and I_LASERRepresenting the drive current provided by the transmit side driver circuit. When driving a current I_LASERIs less than a critical current I_THAt this time, the light emitted from the laser diode is mainly emitted by spontaneous emission, and thus the optical transmission power TxP is small. When the driving current value I_LASERIs above the critical current I_THWhen the laser diode is oscillated, the intensity of the exciting radiation is along with the driving current I_LASERIs increased sharply. In order to avoid the time delay between the output of logic 0 and logic 1 signals of the laser diode caused by the above condition, each transmitting end driving circuit can provide a bias current I with a fixed value_BIASAs a drive current for a logic 0 signal, wherein the bias current I_BIASIs greater than the critical current I_THA value of (a) and I_LASER＝I_BIAS. For the drive current of logic 1 signal, each transmitting end drive circuit can also provide a modulation current I switched with the input signal_MODAnd I is_LASER＝I_BIAS+I_MOD。

The power monitoring unit 50A may monitor the optical transmission power TxP _ a of the optical transmitter sub-module TOSA _ a and the optical reception power RxP _ a of the optical receiver sub-module ROSA _ a in the optical transceiver 100A. The power monitoring unit 50B may monitor the optical transmission power TxP _ B of the optical transmitter sub-module TOSA _ B and the optical reception power RxP _ B of the optical receiver sub-module ROSA _ B in the optical transceiver 100B.

Fig. 4 is a schematic diagram illustrating a correlation between information monitored by each power monitoring unit in the optical fiber communication system 100 or 200 according to an embodiment of the present invention. For illustrative purposes, it is assumed that the optical transceiver 100A is a transmitting end device and the optical transceiver 100B is a receiving end device. When the optical transmit sub-module TOSA _ a in the optical transceiver 100A outputs the optical transmit power TxP _ a, the optical receive power actually input to the optical receive sub-module ROSA _ B in the optical transceiver 100B is RxP _ B. The light source propagating in the fiber experiences both intrinsic losses (e.g., material scattering, material absorption, waveguide scattering, etc.) and extrinsic losses (e.g., bending, microbending, splice loss, manufacturing damage, etc.) that cause the receive power of the receiving device to be lower than the transmit power of the transmitting device, where PL is TxP _ a-RxP _ B.

In addition, the optical transceiver 100B has an input sensitivity P corresponding to the optical receive sub-module ROSA _ B of different brands_ISThe energy budget (power budget) PB reflects the degree of energy attenuation caused by the aging of the internal components of the optical transceiver 100B and the aging of the optical fiber lines, and P can be set by the user or automatically set by the system for different usage considerations_ISAnd the value of PB. According to input sensitivity P_ISAnd the energy budget PB may determine the expected input power ExP _ B of the optical transceiver 100B, where ExP _ B is P_IS+ PB. As shown in fig. 4, when the actual optical receiving power RxP _ B input into the optical transceiver 100B is greater than the expected input power ExP _ B, the excess power difference value Δ TxP is wasted, where Δ TxP is RxP _ B-ExP _ B.

In the present invention, the optical transceiver 100A can adjust the optical transmission power TxP _ a of its TOSA _ a to minimize the power difference value Δ TxP under the condition of ensuring normal communication. Assume that the initial value of the optical transmission power TxP _ a of the optical transceiver 100A is TX0, and the adjusted value of the optical transmission power TxP _ a is TX1, where TX1 is TX0- Δ TxP + n × Δ P, n represents the fine adjustment scale, and Δ P represents the fine adjustment amount corresponding to each fine adjustment scale.

Fig. 5 is a flow chart illustrating the operation of the optical fiber communication system 100 or 200 according to the embodiment of the present invention. For illustrative purposes, it is also assumed that the optical transceiver 100A of the optical fiber communication system 100 or 200 is a transmitting end device, and signals can be transmitted to the optical transceiver 100B of a receiving end device through the optical fiber 10. The flow chart shown in fig. 5 comprises the following steps:

step 500: starting a power correction program; step 510 is performed.

Step 510: the optical transceiver 100A sets the value of the fine adjustment scale n to 0 and sets the optical transmission power TxP _ a thereof to an initial value TX 0; step 520 is performed.

Step 520: the optical transceiver 100A sends a power calibration request packet to the optical transceiver 100B with the optical transmission power TxP _ a through the optical fiber 10; step 530 is performed.

Step 530: the optical transceiver 100B sends a power calibration return packet including the optical receive power RxP _ B and the expected input power ExP _ B to the optical transceiver 100A via the optical fiber 20; step 540 is performed.

Step 540: the optical transceiver 100A determines whether the actually input optical received power RxP _ B is greater than the expected input power ExP _ B; if yes, go to step 550; if not, go to step 580.

Step 550: the optical transceiver 100A calculates a power difference value Δ TxP according to the values of the optical receiving power RxP _ B and the expected input power ExP _ B; step 560 is performed.

Step 560: the optical transceiver 100A sets the optical transmit power TxP _ a as an adjustment value TX1, and sends a test packet to the optical transceiver 100B with the adjusted optical transmit power TxP _ a for performing a verification procedure, wherein TX1 is TX0- Δ TxP + n Δ P; step 572 is performed.

Step 572: the optical transceiver 100A determines whether information of successful authentication is received from the optical transceiver 100B; if yes, go to step 580; if not, go to step 574.

Step 574: the optical transceiver 100A adds 1 to the value of the fine tuning scale n; step 576 is performed.

Step 576: the optical transceiver 100A determines whether the adjustment value TX1 is greater than a maximum optical transmission power value TP_MAX(ii) a If yes, go to step 578; if not, go to step 560.

Step 578: the optical transceiver 100A issues an online anomaly alarm.

Step 580: the power correction procedure is ended.

When a link-on event occurs in the optical fiber communication system 100 or 200, once connection or poor communication is determined (e.g., a large CRC increase is detected), the power calibration procedure is restarted to obtain the optimal power setting in step 500. For illustration purposes, the optical transceiver 100A is taken as a transmitting end and the optical transceiver 100B is taken as a receiving end.

In step 510, the optical transceiver 100A sets the fine tuning scale n to 0 and sets its optical transmission power TxP _ a is set to the initial value TX 0. Therefore, in step 520, the optical transceiver 100A sends the power calibration request packet to the optical transceiver 100B with the optical transmit power TxP _ a having the initial value TX 0. In one embodiment, the initial value TX0 may be the maximum optical transmission power value TP allowed by the specification of the TOSA _ a in the optical transceiver 100A_MAX. In other embodiments, the initial value TX0 may be any value not greater than TP allowed by the specification of the optical transmitter optical subassembly TOSA _ a in the optical transceiver 100A_MAXThe output power of (1). However, the manner of setting the initial value TX0 does not limit the scope of the present invention.

After receiving the power calibration request packet from the optical transceiver 100A, the optical transceiver 100B knows the actual input optical reception power RxP _ B, and therefore sends a power calibration return packet including the optical reception power RxP _ B and the expected input power ExP _ B to the optical transceiver 100A through the optical fiber 20 in step 530.

In step 540, after receiving the power calibration return packet from the optical transceiver 100B, the optical transceiver 100A may determine whether the optical receive power RxP _ B is greater than the expected input power ExP _ B. When the optical received power RxP _ B is determined to be greater than its expected input power ExP _ B, the difference between representation RxP _ B and ExP _ B is wasted. Therefore, the optical transceiver 100A then calculates a power difference value Δ TxP according to the values of the optical receive power RxP _ B and the expected input power ExP _ B in step 550, where Δ TxP is RxP _ B-ExP _ B. When the optical transceiver 100A determines in step 540 that the optical received power RxP _ B is not greater than the expected input power ExP _ B, it represents that the optical transmit power TxP _ a of the optical transceiver 100A may be abnormal or the path loss PL between the optical transceiver 100A and the optical transceiver 100B is too large, and step 580 is executed to end the power calibration procedure.

In step 560, the optical transceiver 100A sets the optical transmit power TxP _ a as the adjusted value TX1, and sends a test packet to the optical transceiver 100B with the adjusted optical transmit power TxP _ a for performing the verification procedure, where TX1 is TX0- Δ TxP + n Δ P. In the first execution of step 560, the value of the fine tuning scale n is 0 set in step 510, and the adjustment value TX1 is the initial value TX0 minus the optical transmission power compensation value Δ TxP.

As shown in fig. 4, there may be power consumption caused by the path loss PL between the optical transceivers 100A and 100B, and many factors affect the power consumption value of the path loss PL. Therefore, the optical transceiver 100A performs the verification procedure in steps 572-578 to ensure that the optical transmit power TxP _ A with the adjusted value TX1 can be used to transmit data smoothly.

In step 560, the optical transceiver 100A sends the test packet to the optical transceiver 100B with the optical transmit power TxP _ a having the adjusted value TX 1. The optical transceiver 100B receives the test packet and verifies the test packet, and notifies the optical transceiver 100A of the verification. If the information of successful verification is received from the optical transceiver 100B in step 572, step 580 is executed to end the power calibration procedure, at which point the optical transceiver 100A transmits a signal to the optical transceiver 100B with the optical transmit power TxP _ a having the adjustment value TX1, wherein TX1 is TX0- Δ TxP, so that power consumption can be reduced while ensuring normal data transmission.

If the optical transceiver 100A cannot receive the verification success message from the optical transceiver 100B in step 572, the optical transceiver 100A then increments the fine scale n by 1 in step 574, and then proceeds to step 576 to determine whether the adjustment value TX1 is greater than the maximum optical transmission power TP_MAX. If the adjusted optical transmission power TxP _ A is not greater than the maximum optical transmission power TP_MAXThen step 560 is performed again.

In the second execution of step 560, the value of the fine tuning scale n is 1, and the adjusted value TX1 is the initial value TX0 minus the optical transmit power offset Δ TxP plus a fine tuning amount Δ P, and the optical transceiver 100A sends the test packet to the optical transceiver 100B with the latest adjusted optical transmit power TxP _ a for verification. Once the verification is determined to be successful in step 572, the optical transceiver 100A may transmit data using the transmission power TxP _ a having the value of the adjustment value TX1(TX0- Δ TxP + Δ P).

If the verification is not successful after the second execution of step 560, the optical transceiver 100A will again execute steps 572, 574, and 576 in sequence. When the value of the fine-tuning scale n is addedWhen the adjustment value TX1(TX0- Δ TxP + n × Δ P) is verified in step 560, step 580 is executed to end the power calibration procedure, and the optical transceiver 100A can transmit data using the TX power TxP _ a with the value (TX0- Δ TxP + n × Δ P). Once the latest adjusting value TX1(TX0- Δ TxP + n × Δ P) is determined to be larger than the maximum optical transmission power value TP during the fine tuning process_MAXIn this case, the optical transceiver 100A performs step 578 to issue an online anomaly alarm.

Fig. 6 is a flowchart illustrating the operation of the optical fiber communication system 100 according to another embodiment of the present invention. For illustrative purposes, it is also assumed that the optical transceiver 100A of the optical fiber communication system 100 is a transmitting end device, and signals can be transmitted to the optical transceiver 100B of a receiving end device through the optical fiber 10.

Step 600: starting a power correction program; step 610 is performed.

Step 610: the optical transceiver 100A sets the value of the fine adjustment scale n to 0 and sets the optical transmission power TxP _ a thereof to an initial value TX 0; step 620 is performed.

Step 620: the optical transceiver 100A sends a power calibration request packet to the optical transceiver 100B with the optical transmission power TxP _ a through the optical fiber 10; step 630 is performed.

Step 630: the optical transceiver 100B calculates a power difference value Δ TxP according to the values of the optical receiving power RxP _ B and the expected input power ExP _ B; step 640 is performed.

Step 640: the optical transceiver 100B sends a power calibration feedback packet containing the power difference value Δ TxP to the optical transceiver 100A through the optical fiber 20; step 650 is performed.

Step 650: the optical transceiver 100A determines whether the power difference value Δ TxP is greater than 0; if yes, go to step 660; if not, go to step 680.

Step 660: the optical transceiver 100A sets the optical transmit power TxP _ a as an adjusted value TX1, and sends a test packet to the optical transceiver 100B for verification with the adjusted optical transmit power TxP _ a, where TX1 is TX0- Δ TxP + n × Δ P; step 672 is performed.

Step 672: the optical transceiver 100A determines whether information of successful authentication is received from the optical transceiver 100B; if yes, go to step 680; if not, go to step 674.

Step 674: the optical transceiver 100A adds 1 to the value of the fine tuning scale n; step 676 is performed.

Step 676: the optical transceiver 100A determines whether the adjustment value TX1 is greater than a maximum optical transmission power value TP_MAX(ii) a If yes, go to step 678; if not, go to step 660.

Step 678: the optical transceiver 100A issues an online anomaly alarm.

Step 680: the power correction procedure is ended.

In the embodiment shown in FIG. 6, the steps 600 to 620 and 660 to 680 are performed in the same manner as the steps 500 to 520 and 560 to 580 shown in FIG. 5, and are not repeated herein. The difference between the embodiments shown in fig. 5 and fig. 6 is steps 530-550 and 630-650, wherein fig. 5 is that the receiving end device transmits back the optical receiving power RxP _ B and the expected input power ExP _ B, and then the transmitting end device calculates the power difference Δ TxP and determines the magnitude of the power difference Δ TxP; fig. 6 shows that the power difference value Δ TxP is calculated by the receiving end device and then transmitted back to the receiving end device, and the receiving end device determines the magnitude of the power difference value Δ TxP.

In the embodiment shown in fig. 6, after the optical transceiver 100B calculates the power difference Δ Tx according to the values of the optical receiving power RxP _ B and the expected input power ExP _ B in step 630, the value of the power difference Δ TxP is transmitted to the optical transceiver 100A through the optical fiber 20 in step 640, and the optical transceiver 100A determines the magnitude of the power difference Δ Tx in step 650.

In summary, in the optical fiber communication system of the present invention, the optical transceiver of each receiving end periodically determines whether the actually input optical receiving power is greater than the expected input power, and then the optical transceiver of the corresponding transmitting end reduces the optical transmitting power according to the power difference value, and performs a verification procedure to ensure that the adjusted optical transmitting power can normally transmit data. Therefore, the invention can dynamically optimize the optical transmission power of the optical transceiver at the transmission end, thereby reducing the system power consumption under the condition of ensuring normal data.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.