阅读说明：本技术 光纤信号放大系统、及光纤线路测量系统 (Optical fiber signal amplification system and optical fiber line measurement system ) 是由 孙少华 杨林慧 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种光纤信号放大系统、及光纤线路测量系统。其中,该光纤信号放大系统,包括：远程增益单元,串联接入待测试光纤中间,其中,远程增益单元内置掺铒光纤,待测试光纤用于传输信号光；泵浦源,通过合波器接入远程增益单元,用于将泵浦光注入掺铒光纤,其中,泵浦光用于激励掺铒光纤中的铒离子,放大信号光。本发明解决了由于传统光纤系统传输距离较短,而造成长距离传输需要使用多个中继放大器的技术问题。(The invention discloses an optical fiber signal amplification system and an optical fiber line measurement system. Wherein, this optical fiber signal amplification system includes: the remote gain unit is connected in series to the middle of the optical fiber to be tested, wherein the erbium-doped optical fiber is arranged in the remote gain unit, and the optical fiber to be tested is used for transmitting signal light; and the pumping source is connected to the remote gain unit through the wave combiner and is used for injecting pumping light into the erbium-doped optical fiber, wherein the pumping light is used for exciting erbium ions in the erbium-doped optical fiber and amplifying signal light. The invention solves the technical problem that a plurality of relay amplifiers are needed for long-distance transmission due to the short transmission distance of the traditional optical fiber system.)

1. A fiber optic signal amplification system, comprising:

the remote gain unit is connected into an optical fiber to be tested in series, wherein an erbium-doped optical fiber is arranged in the remote gain unit, and the optical fiber to be tested is used for transmitting signal light;

and the pumping source is accessed to the remote gain unit through a wave combiner and is used for injecting pumping light into the erbium-doped optical fiber, wherein the pumping light is used for exciting erbium ions in the erbium-doped optical fiber and amplifying the signal light.

2. The system of claim 1, comprising:

and the remote gain unit is arranged at the receiving end of the optical fiber to be tested.

3. The system of claim 2, comprising:

the pumping source is arranged at the receiving end of the optical fiber to be tested; or a transmitting end.

4. The system of claim 1, comprising:

the combiner is connected in series to the middle of the optical fiber to be tested on the outer side of the remote gain unit and is used for enabling the signal light and the pump light to be transmitted through the optical fiber to be tested.

5. The system of claim 1, comprising:

and the wave combiner is arranged in the remote gain unit and is connected with the pumping source through a preset optical fiber, so that the pumping light is transmitted through the preset optical fiber.

6. The system of claim 5, wherein the remote gain unit comprises:

and the first optical isolator is arranged between the erbium-doped optical fiber and the receiving end of the optical fiber to be tested.

7. The system of claim 1, wherein the combiner comprises:

the first wave combiner is connected in series with the middle of the optical fiber to be tested on the outer side of the remote gain unit, is connected with the first end of the pumping source and is used for injecting the pumping light into the erbium-doped optical fiber through the optical fiber to be tested;

and the second wave combiner is arranged in the remote gain unit, is connected with the second end of the pumping source through a preset optical fiber and is used for injecting the pumping light into the erbium-doped optical fiber through the preset optical fiber.

8. The system of claim 1, comprising:

the remote gain unit is arranged at the receiving end of the optical fiber to be tested;

the pumping source is arranged at the transmitting end of the optical fiber to be tested;

and the wave combiner is arranged in the remote gain unit and is connected with the pumping source through a preset optical fiber, so that the pumping light is transmitted through the preset optical fiber.

9. The system of any of claims 1-8, wherein the remote gain unit comprises:

and the second optical isolator is arranged between the erbium-doped optical fiber and the emission end of the optical fiber to be tested.

10. A fiber optic line measurement system, comprising:

a transmitting end for transmitting the signal light,

the receiving end is used for receiving the signal light and measuring based on the signal light;

an optical fiber to be tested connected between the transmitting end and the receiving end for transmitting the signal light, wherein the optical fiber to be tested is connected with the optical fiber signal amplifying system of any one of claims 1-9.

Technical Field

The invention relates to the field of optical fiber testing, in particular to an optical fiber signal amplification system and an optical fiber line measurement system.

Background

The current power communication network is mainly based on optical fiber communication, and communication equipment is deployed in a transformer substation. In an extra-high voltage power grid, the distance between two substations can reach more than 200km, if a traditional relay amplification method of the erbium-doped fiber amplifier EDFA is used, a plurality of erbium-doped fiber amplifiers EDFA need to be arranged between the substations, and although the erbium-doped fiber amplifiers EDFA serving as the relay amplifiers are all-optical amplification devices, the EDFA needs to be powered to drive laser pumping to generate gain so as to compensate transmission loss of communication signals. Obviously, the stability of the communication line is affected by the relay amplifier device itself, and in particular by its environment. The topography and the landform of the ultra-high voltage transmission line passing through the region are complex, and the maintenance of the optical communication line becomes relatively difficult by using the traditional scheme of multi-relay discrete amplification.

In view of the above-mentioned problem that a plurality of repeater amplifiers are required for long-distance transmission due to the short transmission distance of the conventional optical fiber system, no effective solution has been proposed.

Disclosure of Invention

The embodiment of the invention provides an optical fiber signal amplification system and an optical fiber line measurement system, which at least solve the technical problem that a plurality of relay amplifiers are needed for long-distance transmission due to the short transmission distance of the traditional optical fiber system.

According to an aspect of an embodiment of the present invention, there is provided an optical fiber signal amplifying system including: the remote gain unit is connected into an optical fiber to be tested in series, wherein an erbium-doped optical fiber is arranged in the remote gain unit, and the optical fiber to be tested is used for transmitting signal light; and the pumping source is accessed to the remote gain unit through a wave combiner and is used for injecting pumping light into the erbium-doped optical fiber, wherein the pumping light is used for exciting erbium ions in the erbium-doped optical fiber and amplifying the signal light.

Optionally, the remote gain unit is disposed at a receiving end of the optical fiber to be tested.

Optionally, the pump source is disposed at a receiving end of the optical fiber to be tested; or a transmitting end.

Optionally, the combiner is serially connected to the middle of the optical fiber to be tested outside the remote gain unit, and is configured to transmit the signal light and the pump light through the optical fiber to be tested.

Optionally, the wave combiner is disposed in the remote gain unit, and is connected to the pump source through a predetermined optical fiber, so that the pump light is transmitted through the predetermined optical fiber.

Optionally, the remote gain unit comprises: and the first optical isolator is arranged between the erbium-doped optical fiber and the receiving end of the optical fiber to be tested.

Optionally, the combiner comprises: the first wave combiner is connected in series with the middle of the optical fiber to be tested on the outer side of the remote gain unit, is connected with the first end of the pumping source and is used for injecting the pumping light into the erbium-doped optical fiber through the optical fiber to be tested; and the second wave combiner is arranged in the remote gain unit, is connected with the second end of the pumping source through a preset optical fiber and is used for injecting the pumping light into the erbium-doped optical fiber through the preset optical fiber.

Optionally, the remote gain unit is disposed at a receiving end of the optical fiber to be tested; the pumping source is arranged at the transmitting end of the optical fiber to be tested; and the wave combiner is arranged in the remote gain unit and is connected with the pumping source through a preset optical fiber, so that the pumping light is transmitted through the preset optical fiber.

Optionally, the remote gain unit comprises: and the second optical isolator is arranged between the erbium-doped optical fiber and the emission end of the optical fiber to be tested.

According to another aspect of the embodiments of the present invention, there is also provided an optical fiber line measurement system, including: the receiving end is used for receiving the signal light and carrying out measurement based on the signal light; and the optical fiber to be tested is connected between the transmitting end and the receiving end and is used for transmitting the signal light, wherein the optical fiber to be tested is connected with the optical fiber signal amplification system.

In the embodiment of the invention, a remote gain unit is connected in series into an optical fiber to be tested, wherein the remote gain unit is internally provided with an erbium-doped optical fiber, and the optical fiber to be tested is used for transmitting signal light; the pump source, insert the remote gain unit through the wave combiner, be used for injecting the pump light into erbium-doped fiber, wherein, the pump light is used for encouraging the erbium ion in the erbium-doped fiber, amplify the signal light, insert the remote gain unit through the optic fibre that awaits measuring, can be at the in-process that uses the optic fibre transmission signal light that awaits measuring, utilize the erbium ion amplification signal light in the pump light excitation remote gain unit, the purpose of amplifying the signal light has been reached, can improve the transmission distance of signal light, thereby realized under the condition that does not use repeater, improve the technical effect of optic fibre to the transmission distance of signal light, and then solved because traditional fiber system transmission distance is shorter, and cause long distance transmission to need to use a plurality of repeater technical problem.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a first schematic diagram of a fiber optic signal amplification system according to an embodiment of the present invention;

FIG. 2 is a second schematic diagram of an optical fiber signal amplification system according to an embodiment of the present invention;

FIG. 3 is a third schematic diagram of a fiber optic signal amplification system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a fiber optic line measurement system according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a first schematic diagram of an optical fiber signal amplifying system according to an embodiment of the present invention, as shown in fig. 1, including: the remote gain unit 10 is connected in series into an optical fiber 12 to be tested, wherein the erbium-doped optical fiber 14 is arranged in the remote gain unit 10, and the optical fiber 12 to be tested is used for transmitting signal light; the pump source 16 is connected to the remote gain unit 10 through the combiner 18, and is configured to inject pump light into the erbium-doped fiber 14, where the pump light is used to excite erbium ions in the erbium-doped fiber 14 and amplify the signal light.

In the embodiment of the invention, a remote gain unit is connected in series into an optical fiber to be tested, wherein the remote gain unit is internally provided with an erbium-doped optical fiber, and the optical fiber to be tested is used for transmitting signal light; the pump source, insert the remote gain unit through the wave combiner, be used for injecting the pump light into erbium-doped fiber, wherein, the pump light is used for encouraging the erbium ion in the erbium-doped fiber, amplify the signal light, insert the remote gain unit through the optic fibre that awaits measuring, can be at the in-process that uses the optic fibre transmission signal light that awaits measuring, utilize the erbium ion amplification signal light in the pump light excitation remote gain unit, the purpose of amplifying the signal light has been reached, can improve the transmission distance of signal light, thereby realized under the condition that does not use repeater, improve the technical effect of optic fibre to the transmission distance of signal light, and then solved because traditional fiber system transmission distance is shorter, and cause long distance transmission to need to use a plurality of repeater technical problem.

Optionally, the pump light has a wavelength of 1450nm to 1490 nm.

Alternatively, the wavelength of the pump beam may be 1480 nm.

Optionally, one end for transmitting the signal light is a transmitting end, and one end for receiving the signal light is a receiving end.

Alternatively, the signal light may be used as a test signal for detecting event information of the optical fiber to be tested, such as a connector, a fusion point, a bend, and the like.

As an alternative embodiment, the system further comprises: and the remote gain unit is arranged at the receiving end of the optical fiber to be tested.

In the above embodiment of the present invention, the remote gain unit is disposed at the receiving end of the optical fiber to be tested, and can amplify the signal light received by the receiving end, so that the optical fiber can realize the remote transmission of the signal light without arranging a plurality of relay amplifiers between the transmitting end and the receiving end.

As an alternative embodiment, the system further comprises: the pumping source is arranged at the receiving end of the optical fiber to be tested; or a transmitting end.

In the above embodiments of the present invention, the pump source may be disposed at the receiving end or the transmitting end of the optical fiber to be tested, and the signal light may be flexibly amplified based on the use environment by flexibly disposing the pump source.

Optionally, the pump source is divided into a channel associated pump and a bypass pump according to different delivery modes of the pump source for the pump light, wherein the channel associated pump mode refers to that the pump light and the signal light are transmitted by using the same optical fiber; the bypass pumping means that the pump light is transmitted using an additional optical fiber (i.e., a predetermined optical fiber).

As an alternative embodiment, the system further comprises: and the combiner is connected in series with the middle of the optical fiber to be tested on the outer side of the remote gain unit and is used for transmitting the signal light and the pump light through the optical fiber to be tested.

As an alternative embodiment, the system further comprises: and the wave combiner is arranged in the remote gain unit and is connected with the pumping source through a preset optical fiber, so that the pumping light is transmitted through the preset optical fiber.

Fig. 2 is a second schematic diagram of an optical fiber signal amplification system according to an embodiment of the present invention, and as shown in fig. 2, the remote gain unit includes: and a first optical isolator 21 arranged between the erbium-doped fiber and the receiving end of the fiber to be tested.

In the above embodiment of the present invention, under the condition of using the bypass pump, the first optical isolator is disposed in the remote gain unit, so that the amplified signal light in the erbium-doped fiber can be transmitted to the receiving end in a single direction through the first optical isolator.

As an alternative embodiment, the combiner comprises: the first wave combiner is connected in series with the middle of the optical fiber to be tested on the outer side of the remote gain unit, is connected with the first end of the pumping source and is used for injecting pumping light into the erbium-doped optical fiber through the optical fiber to be tested; and the second wave combiner is arranged in the remote gain unit, is connected with the second end of the pumping source through a preset optical fiber and is used for injecting the pumping light into the erbium-doped optical fiber through the preset optical fiber.

In the above embodiment of the present invention, a scheme of channel associated pumping and bypass pumping is used simultaneously, the first combiner injects pumping light to the erbium-doped fiber through the fiber to be tested, and the second combiner injects pumping light to the erbium-doped fiber through the predetermined fiber, so that signal light can be further amplified through the erbium-doped fiber, and the signal light can be transmitted for a longer distance.

As an alternative embodiment, the system further comprises: the remote gain unit is arranged at the receiving end of the optical fiber to be tested; the pumping source is arranged at the transmitting end of the optical fiber to be tested; and the wave combiner is arranged in the remote gain unit and is connected with the pumping source through a preset optical fiber, so that the pumping light is transmitted through the preset optical fiber.

In the above embodiments of the present invention, under the condition that the pump source is disposed at the emission end, the pump light is injected into the erbium-doped fiber through the predetermined fiber by using a bypass pump, so that the mutual interference between the signal light and the pump light can be reduced.

Fig. 3 is a third schematic diagram of an optical fiber signal amplification system according to an embodiment of the present invention, and as shown in fig. 3, the remote gain unit includes: and a second optical isolator 30 disposed between the erbium-doped fiber and the emitting end of the fiber to be tested.

In the above embodiments of the present invention, the second optical isolator is disposed between the erbium-doped fiber and the transmitting end of the fiber to be tested, so that the signal light can be transmitted in one direction through the second optical isolator.

Fig. 4 is a schematic diagram of a fiber optic line measurement system according to an embodiment of the present invention, as shown in fig. 4, including: the receiving end RX is used for receiving the signal light and carrying out measurement based on the signal light; and the optical fiber 12 to be tested is connected between the transmitting end TX and the receiving end RX and is used for transmitting signal light, wherein the optical fiber 12 to be tested is connected with the optical fiber signal amplification system.

In the embodiment of the invention, a remote gain unit is connected in series into an optical fiber to be tested, wherein the remote gain unit is internally provided with an erbium-doped optical fiber, and the optical fiber to be tested is used for transmitting signal light; the pump source, insert the remote gain unit through the wave combiner, be used for injecting the pump light into erbium-doped fiber, wherein, the pump light is used for encouraging the erbium ion in the erbium-doped fiber, amplify the signal light, insert the remote gain unit through the optic fibre that awaits measuring, can be at the in-process that uses the optic fibre transmission signal light that awaits measuring, utilize the erbium ion amplification signal light in the pump light excitation remote gain unit, the purpose of amplifying the signal light has been reached, can improve the transmission distance of signal light, thereby realized under the condition that does not use repeater, improve the technical effect of optic fibre to the transmission distance of signal light, and then solved because traditional fiber system transmission distance is shorter, and cause long distance transmission to need to use a plurality of repeater technical problem.

The invention also provides a preferable embodiment, and the preferable embodiment provides a relay-free long-distance optical fiber line measuring system.

Optionally, a remote Pumped optical Amplifier (ROPA), which is called a remote Pumped Amplifier for short, is mainly used in a unrepeatered system to improve a power budget of the system and extend a transmission distance. When the indexes of Raman amplification are exhausted by the span of the optical fiber line, the span loss can be improved by about 10dB by adopting the remote pump optical amplifier ROPA, and the greater expansion on the span can be allowed.

Optionally, the unrepeatered long-distance optical fiber line measurement system combines the remote pump optical amplifier ROPA and the optical fiber raman amplifier RFA to be used, so that the transmission distance can be maximally extended, and the power budget of the system can be improved.

The remote pump optical amplifier ROPA system can be described simply as: erbium Doped Fibers (EDFs) and related passive components are placed in special cases, accessed at specific locations of the transmission fiber, while the pump light source is placed at the termination. The small-gain line amplifier in the far pump line can effectively improve the transmission distance of the unrepeatered system.

A box body containing a section of erbium-doped fiber and passive devices such as an optical isolator is fused into a proper position in the middle of a transmission fiber (such as a fiber to be tested), and the box body is called a Remote Gain Unit (RGU), and high-power pump light with one or more wavelengths near 1480nm or 1380nm (high-order remote pump, namely a pump source) is emitted from a transmitting end or a receiving end, injected into the erbium fiber after being injected into the fiber through a wave combiner and transmitted, and excites erbium ions. The signal light is amplified inside the erbium fiber, and the power budget of the system is obviously improved. Since the pump laser is not located at the same position as the gain medium (i.e., erbium doped fiber), it is called "far pump".

Alternatively, the remote pump optical amplifier ROPA may be classified into a remote pump preamplifier (Pre-ROPA) and a remote pump Post-amplifier (Post-ROPA) according to the position of the remote gain unit placed in the link.

Alternatively, the pump source of the remote pump preamplifier Pre-ROPA is placed at the receiving end, and the remote gain unit RGU is located in the link close to the receiving end, which plays a preventive role for the signal light.

Alternatively, the pump source of the far pump Post-amplifier Post-ROPA is placed at the transmit end, and the remote gain unit RGU is located close to the receive end in the link.

In addition, the remote pump (i.e. the pump source) is divided into a channel pump and a bypass pump according to the different delivery modes of the remote pump.

Alternatively, the channel pumping mode refers to that the pump light and the signal light are transmitted by using the same optical fiber.

Alternatively, the bypass pumping mode refers to the pumping light being transmitted by using an additional optical fiber (e.g., a predetermined optical fiber).

It should be noted that the remote pump has four basic forms, but the post-remote pump amplifier has two disadvantages if the channel pumping method is adopted. Firstly, because the signal light and the pump light injected into the transmission fiber from the transmitting end are both stronger, Raman gain of the signal can be caused near the transmitting end, and the signal intensity is limited by the SBS threshold of the fiber, so that the nonlinear cost of the system is larger; secondly, when high power pump light and signal light are transmitted in the same direction in the same fiber, Relative Intensity Noise (RIN) from the pump is converted to the signal due to the fast response speed of Raman scattering process, so that it is preferable to use bypass pumping for the post-remote pump amplifier.

Optionally, when the configuration mode of the front remote pump is adopted, the mode of the channel associated pump is mostly adopted. Because the signal light reaching the receiving end is very small, the 1480nm pump light is reversely injected into the transmission optical fiber and is transmitted in the same optical fiber with the signal light in the opposite direction, so that the Raman amplification effect can be realized, and the system has a simple structure and is easy to construct and maintain.

But the pump light power in a single fiber is limited to below 2W due to the influence of Raman scattering. If the link budget can not meet the requirement after the front-end channel associated remote pump is adopted, the channel associated pump and the bypass pump can be used together, and the pump light is transmitted and injected into the remote gain unit RGU through the signal optical fiber and the special optical fiber respectively so as to improve the gain of the remote gain unit RGU to the signal. The adoption of the two-way pumping mode can increase the link budget by about 2 dB.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.