阅读说明：本技术 一种局端到远端的光纤状态检测方法 (Method for detecting optical fiber state from local side to far side ) 是由 骆益民 黄志新 陈烈强 赖柏辉 徐远佃 何小婵 江永杰 刘年 王剑锋 余冬玲 杨 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种局端到远端的光纤状态检测方法,包括步骤：局端客户端的监控光源发出检测光信号,所述检测光信号输出至有源设备内；局端客户端发出数据业务光信号进过分波器分波后,其中1％的光进入到第二光探测器进行检测得到P2并判断业务的在线状态；剩下的99％输入到有源设备的波分复用器中与光开关的输出的光信号进行合波后通过待测光纤线路传输至远端客户端；远端客户端的无源设备中通过波分解复用器分离出检测光信号和数据业务光信号,的检测光信号在反射器反射回到波分解复用器中,而所述数据业务光信号经过反射器后输出至客户接收端。本发明采用每芯独立监测设计,每路光源独立,无需配置即可使用,即可获取每路纤芯的可用性、业务在线的监测。(The invention discloses a method for detecting the state of an optical fiber from a local side to a remote side, which comprises the following steps: a monitoring light source of a local side client side sends out a detection light signal, and the detection light signal is output to active equipment; after a data service optical signal sent by the local side client enters a wave separator for wave separation, 1% of light enters a second optical detector for detection to obtain P2 and the online state of the service is judged; the remaining 99% of the optical signals are input into a wavelength division multiplexer of the active equipment, are multiplexed with the optical signals output by the optical switch, and are transmitted to a remote client through an optical fiber line to be tested; the passive device of the far-end client separates out detection optical signals and data service optical signals through a wavelength division demultiplexer, the detection optical signals are reflected back to the wavelength division demultiplexer through a reflector, and the data service optical signals are output to a client receiving end after passing through the reflector. The invention adopts the independent monitoring design of each core, each path of light source is independent, and the light source can be used without configuration, thereby obtaining the availability of each path of fiber core and the on-line monitoring of the service.)

1. A method for office-to-remote fiber status detection, the method comprising the steps of:

step 1: a monitoring light source of a local side client side sends out a detection light signal, the detection light signal is output to active equipment, an optical switch of the active equipment is divided into N paths of light signals, the N paths of light signals are respectively input to N paths of unit detection light paths, and the N paths of light signals enter a wavelength division multiplexer after entering the unit detection light paths;

step 2: after the data service optical signal sent by the local side client enters the wave separator for wave separation, 1% of the data service optical signal enters a second optical detector of the active device for detection, and detection data P2 is obtained to judge the online state of the service;

when P2 is greater than 0, the service is judged to be on-line; otherwise, judging that the service is not on-line;

inputting the remaining 99% of data service optical signals into a wavelength division multiplexer of the active device, combining the optical signals with the detection optical signals output by the optical switch, outputting the combined optical signals to any path of optical fiber line to be detected through a circulator and a flange, and transmitting the combined optical signals to a remote client through the optical fiber line to be detected;

and step 3: any path of unit reflection optical path in the optical fiber reflection module in the passive device of the remote client receives an optical signal transmitted by an optical fiber line to be detected and then separates out a detection optical signal and a data service optical signal through a wavelength division demultiplexer, the detection optical signal and the data service optical signal are transmitted to a reflector, the detection optical signal is reflected back to the wavelength division demultiplexer at the reflector and is transmitted to the optical fiber line to be detected through the wavelength division demultiplexer and transmitted back to a client sending end, and the data service optical signal is output to a client receiving end after passing through the reflector;

and 4, step 4: the office client-side block receives the detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator to be detected to obtain detection data P4, and outputs the detection data signal to the control module to judge the availability of the optical fiber to be detected.

2. The method according to claim 1, wherein the active device comprises a control module and a light detection module, the light detection module comprises a monitoring light source, an optical switch and N unit detection optical paths, and each unit detection optical path comprises a wavelength division multiplexer, an optical splitter, a circulator, a first photodetector, a second photodetector, a third photodetector, and a fourth photodetector;

the passive device comprises N paths of unit reflection light paths, and any path of unit reflection light path comprises a wavelength division demultiplexer and a reflector;

the monitoring light source emits detection light signals, and the detection light signals are output to the optical switch to be divided into N paths of light signals which are respectively input to N paths of unit detection light paths;

after a data service optical signal sent by a local side client enters a wave separator for wave separation, 1% of the data service optical signal enters a second optical detector connected with the local side client for detection, and the remaining 99% of the data service optical signal is input into one path of unit detection optical path connected with the local side client and is output to an optical fiber to be detected through a circulator and an output port after being combined with one path of optical signal output by an optical switch in the unit detection optical path and is transmitted to a remote side client connected with the local side client through the optical fiber to be detected;

the method comprises the steps that a far-end client receives a composite optical signal and transmits the composite optical signal to an optical fiber reflection module of passive equipment, any path of unit reflection optical path of the optical fiber reflection module receives an optical signal transmitted by an optical fiber line to be detected and then separates an optical detection signal and a data service optical signal through a wavelength division demultiplexer, the optical detection signal and the data service optical signal are transmitted to a reflector, the optical detection signal is reflected back to the wavelength division demultiplexer through the reflector and transmitted to an optical fiber to be detected through the wavelength division demultiplexer, and the data service optical signal is output to a user client after passing through the reflector;

the optical detection module receives a detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator for detection, and outputs a detected data signal to the control module;

and after the control module acquires the detection data, the control module judges the running condition of each optical fiber circuit and reports the information to the resource network management server.

3. The office-to-remote fiber status detection method of claim 2,

the first photoelectric detector is optically connected with the optical switch and is used for collecting a detection optical signal power value P1 output by the optical switch;

the third photoelectric detector is connected with the circulator and is used for detecting the optical power value P3 of the optical signal after passing through the circulator;

the fourth photodetector is connected to the output port, and is configured to detect an optical power value P4 of the optical signal reflected by the reflection module.

4. The office-to-remote optical fiber status detection method according to claim 3, wherein the rules for determining the operation status and the cause of failure of each optical fiber line are as follows:

the judgment basis is as follows: and when the P3 is larger than the P1, judging that the optical signal is normal, otherwise, judging that the optical detection module has a fault, and reporting the fault information to a network management center.

5. The office-to-remote optical fiber status detecting method according to claim 4, wherein the optical fiber line under test generates insertion loss during the optical signal transmission process, and the method for calculating the insertion loss value of the optical fiber line under test comprises:

and the insertion loss value delta of the optical fiber line to be tested is P1-insertion loss of the wavelength division multiplexer-insertion loss of the wavelength division demultiplexer-P4.

6. The office-to-remote optical fiber status detection method according to claim 5, wherein the optical fiber under test is available if the insertion loss value of the optical fiber line under test is less than 0.25dB per kilometer, and is not available if not.

7. The office-to-remote optical fiber status detecting method according to claim 1, wherein the optical fiber to be detected is a 12-core or 24-core optical fiber.

8. The method for detecting the state of the optical fiber from the local side to the remote side according to claim 1, wherein the resource network management server is connected with a mobile phone APP, and is used for in-and-out lookup and operation through the mobile phone APP;

the detection optical signal and the data service optical signal are optical signals with different wavelengths;

the wavelength of the detection optical signal is 1591nm, and the wavelength of the data service optical signal is 1310nm or 1550 nm.

9. The office-to-remote fiber status detection method according to claim 1, wherein said optical switch is an 8-way or 16-way output port optical switch.

10. The office-to-remote fiber status detection method according to claim 1, wherein said output interface employs APC interface fiber.

Technical Field

The invention relates to the field of communication networks, in particular to a method for detecting the state of an optical fiber from a local side to a remote side.

Background

In the operator's network, there are a lot of passive networks, which cannot report their own information automatically, and are called "dummy resources". At present, most light is handed over in-box dumb resource and is not effectual supervision, and the distribution condition and the behavior of resource can't be mastered in real time.

The current resource supervision adopts a manpower inspection mode to ensure the normal operation of the box body, and the mode has high operation cost and poor actual effect.

Most of the current research progress from the intelligent technology angle is a scheme for monitoring the position information, the temperature and the humidity, the vibration displacement and the like of the optical communication box through the internet of things technologies such as an intelligent electronic lock, an intelligent gateway and the like, and the scheme focuses on the aspects of preventing damage, unlocking authority, environment information and the like, and does not provide a scheme for monitoring and managing the link state in the dumb resources.

Therefore, there is a need to improve the prior art and provide a method for detecting the state of an optical fiber from the office end to the remote end, which can improve the efficiency, save the cost and monitor the link state in the dummy resource on line.

Disclosure of Invention

In order to solve the technical problem, a method for detecting the state of the optical fiber from the local side to the remote side, which improves the efficiency, saves the cost and can monitor the state of the link in the dummy resource on line, is provided.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for office-to-remote fiber status detection, the method comprising the steps of:

step 1: a monitoring light source of a local side client side sends out a detection light signal, the detection light signal is output to active equipment, an optical switch of the active equipment is divided into N paths of light signals, the N paths of light signals are respectively input to N paths of unit detection light paths, and the N paths of light signals enter a wavelength division multiplexer after entering the unit detection light paths;

step 2: after a data service optical signal sent by the local side client enters a wave separator for wave separation, 1% of the light enters a second optical detector of the active device for detection to obtain detection data P2 for judging the online state of the service;

when P2 is greater than 0, the service is judged to be on-line; otherwise, judging that the service is not on-line;

the remaining 99% of the optical signals are input into a wavelength division multiplexer of the active equipment, are multiplexed with the optical signals output by the optical switch, are output to any path of optical fiber line to be tested through a circulator and a flange disc, and are transmitted to a remote client through the optical fiber line to be tested;

and step 3: any path of unit reflection optical path in the optical fiber reflection module in the passive device of the remote client receives an optical signal transmitted by an optical fiber line to be detected and then separates out a detection optical signal and a data service optical signal through a wavelength division demultiplexer, the detection optical signal and the data service optical signal are transmitted to a reflector, the detection optical signal is reflected back to the wavelength division demultiplexer at the reflector and is transmitted to the optical fiber line to be detected through the wavelength division demultiplexer and transmitted back to a client sending end, and the data service optical signal is output to a client receiving end after passing through the reflector;

and 4, step 4: the office client-side block receives the detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator to be detected to obtain detection data P4, and outputs the detection data signal to the control module to judge the availability of the optical fiber to be detected.

Preferably, the active device includes a control module and an optical detection module, the optical detection module includes a monitoring light source, an optical switch and N unit detection optical paths, and any unit detection optical path includes a wavelength division multiplexer, an optical splitter, a circulator, a first photodetector, a second photodetector, a third photodetector, and a fourth photodetector;

the passive device comprises N paths of unit reflection light paths, and any path of unit reflection light path comprises a wavelength division demultiplexer and a reflector;

the monitoring light source emits detection light signals, and the detection light signals are output to the optical switch to be divided into N paths of light signals which are respectively input to N paths of unit detection light paths;

after a data service optical signal sent by a local side client enters a wave separator for wave separation, 1% of the data service optical signal enters a second optical detector connected with the local side client for detection, and the remaining 99% of the data service optical signal is input into one path of unit detection optical path connected with the local side client and is output to an optical fiber to be detected through a circulator and an output port after being combined with one path of optical signal output by an optical switch in the unit detection optical path and is transmitted to a remote side client connected with the local side client through the optical fiber to be detected;

the method comprises the steps that a far-end client receives a composite optical signal and transmits the composite optical signal to an optical fiber reflection module of passive equipment, any path of unit reflection optical path of the optical fiber reflection module receives an optical signal transmitted by an optical fiber line to be detected and then separates an optical detection signal and a data service optical signal through a wavelength division demultiplexer, the optical detection signal and the data service optical signal are transmitted to a reflector, the optical detection signal is reflected back to the wavelength division demultiplexer through the reflector and transmitted to an optical fiber to be detected through the wavelength division demultiplexer, and the data service optical signal is output to a user client after passing through the reflector;

the optical detection module receives a detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator for detection, and outputs a detected data signal to the control module;

after the control module acquires the detection data, the control module judges the running condition of each optical fiber circuit through calculation processing and reports the information to the resource network management server.

Preferably, the first photodetector is optically connected to the optical switch, and is configured to collect a detected optical signal power value P1 output from the optical switch;

the third photoelectric detector is connected with the circulator and is used for detecting the optical power value P3 of the optical signal after passing through the circulator;

the fourth photodetector is connected to the output port, and is configured to detect an optical power value P4 of the optical signal reflected by the reflection module.

Preferably, the rules for judging the operation condition and the fault cause of each optical fiber line are as follows:

the judgment basis is as follows: and when the P3 is larger than the P1, judging that the optical signal is normal, otherwise, judging that the optical detection module has a fault, and reporting the fault information to a network management center.

Preferably, the method for calculating the insertion loss value of the optical fiber line to be tested is as follows:

and the insertion loss value delta of the optical fiber line to be tested is P1-insertion loss of the wavelength division multiplexer-insertion loss of the wavelength division demultiplexer-P4.

Preferably, when the insertion loss value Δ per kilometer of the optical fiber line to be tested is less than 0.25, it indicates that the optical fiber to be tested is available, otherwise, it is unavailable.

Preferably, the optical fiber to be tested is a 12-core or 24-core optical fiber.

Preferably, the resource network management server is connected with a mobile phone APP, and is used for consulting and operating in and out through the mobile phone APP;

the detection optical signal and the data service optical signal are optical signals with different wavelengths;

the wavelength of the detection optical signal is 1591nm, and the wavelength of the data service optical signal is 1310nm or 1550 nm.

Preferably, the optical switch is an 8-way or 16-way output port optical switch.

Preferably, the output interface adopts an APC interface fiber.

The invention has the beneficial technical effects that:

the detection method adopts an all-optical design concept, and a detection link is completely designed by adopting a passive optical design and consists of a three-port junction wave separator, a light splitter, a circulator and a reflector, so that the on-off of the link is independent of a power supply, and the equipment is powered off or not, and has no influence on services;

the remote client adopts a passive design, does not need to take electricity, is convenient to deploy and maintain and saves energy;

the optical fiber to be detected adopts an independent monitoring design of each core, each path of light source is independent, and the optical fiber to be detected can be used without configuration, so that the usability of each path of fiber core and the online monitoring of the service can be obtained.

Drawings

Fig. 1 is a schematic diagram of a method for detecting a status of an optical fiber from a central office to a remote location according to the present invention;

fig. 2 is a schematic block diagram of an active device of the present invention.

Fig. 3 is a functional block diagram of a passive device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1-3, a method for office-to-remote fiber status detection includes the steps of:

step 1: a monitoring light source of a local side client side sends out a detection light signal, the detection light signal is output to active equipment, an optical switch of the active equipment is divided into N paths of light signals, the N paths of light signals are respectively input to N paths of unit detection light paths, and the N paths of light signals enter a wavelength division multiplexer after entering the unit detection light paths;

step 2: after a data service optical signal sent by the local side client enters a wave separator for wave separation, 1% of the light enters a second optical detector of the active device for detection to obtain detection data P2 for judging the online state of the service;

when P2 is greater than 0, the service is judged to be on-line; otherwise, judging that the service is not on-line;

the remaining 99% of the optical signals are input into a wavelength division multiplexer of the active equipment, are multiplexed with the optical signals output by the optical switch, are output to any path of optical fiber line to be tested through a circulator and a flange disc, and are transmitted to a remote client through the optical fiber line to be tested;

and step 3: any path of unit reflection optical path in the optical fiber reflection module in the passive device of the remote client receives an optical signal transmitted by an optical fiber line to be detected and then separates out a detection optical signal and a data service optical signal through a wavelength division demultiplexer, the detection optical signal and the data service optical signal are transmitted to a reflector, the detection optical signal is reflected back to the wavelength division demultiplexer at the reflector and is transmitted to the optical fiber line to be detected through the wavelength division demultiplexer and transmitted back to a client sending end, and the data service optical signal is output to a client receiving end after passing through the reflector;

and 4, step 4: the office client-side block receives the detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator to be detected to obtain detection data P4, and outputs the detection data signal to the control module to judge the availability of the optical fiber to be detected.

Preferably, the active device includes a control module and an optical detection module, the optical detection module includes a monitoring light source, an optical switch and N unit detection optical paths, and any unit detection optical path includes a wavelength division multiplexer, an optical splitter, a circulator, a first photodetector, a second photodetector, a third photodetector, and a fourth photodetector;

the passive device comprises N paths of unit reflection light paths, and any path of unit reflection light path comprises a wavelength division demultiplexer and a reflector;

the monitoring light source emits detection light signals, and the detection light signals are output to the optical switch to be divided into N paths of light signals which are respectively input to N paths of unit detection light paths;

after a data service optical signal sent by a local side client enters a wave separator for wave separation, 1% of the data service optical signal enters a second optical detector connected with the local side client for detection, and the remaining 99% of the data service optical signal is input into one path of unit detection optical path connected with the local side client and is output to an optical fiber to be detected through a circulator and an output port after being combined with one path of optical signal output by an optical switch in the unit detection optical path and is transmitted to a remote side client connected with the local side client through the optical fiber to be detected;

the method comprises the steps that a far-end client receives a composite optical signal and transmits the composite optical signal to an optical fiber reflection module of passive equipment, any path of unit reflection optical path of the optical fiber reflection module receives an optical signal transmitted by an optical fiber line to be detected and then separates an optical detection signal and a data service optical signal through a wavelength division demultiplexer, the optical detection signal and the data service optical signal are transmitted to a reflector, the optical detection signal is reflected back to the wavelength division demultiplexer through the reflector and transmitted to an optical fiber to be detected through the wavelength division demultiplexer, and the data service optical signal is output to a user client after passing through the reflector;

the optical detection module receives a detection optical signal reflected by the optical fiber line to be detected, outputs the detection optical signal to the fourth photoelectric detector through the circulator for detection, and outputs a detected data signal to the control module;

after the control module acquires the detection data, the control module judges the running condition of each optical fiber circuit through calculation processing and reports the information to the resource network management server.

Specifically, the optical fiber to be measured is a 12-core or 24-core optical fiber. The resource network management server is connected with a mobile phone APP for displaying data. The optical switch is an 8-path or 16-path output port optical switch. And the output interface adopts an APC interface optical fiber interface.

The first photodetector PD1 is optically connected to the optical switch, and is configured to collect a detection optical signal power value P1 output from the optical switch;

the second photodetector PD2 is connected to the optical splitter, and is configured to detect an optical power value P2 of the data service optical signal at the user end;

the third photodetector PD3 is connected with the circulator and is used for detecting the optical power value P3 of the optical signal after passing through the circulator;

the fourth photo detector PD4 is connected to the output port, and is configured to detect an optical power value P4 of the detected optical signal reflected back by the reflection module.

Preferably, the rule for judging the operation condition of each optical fiber line is as follows:

the judgment basis is as follows: and when the P3 is larger than the P1, judging that the optical signal is normal, otherwise, judging that the optical detection module has a fault, and reporting the fault information to a network management center.

Preferably, the method for calculating the insertion loss value (loss value) of the optical fiber line to be tested is as follows:

and the insertion loss value delta of the optical fiber line to be tested is P1-wavelength division multiplexer insertion loss-wavelength division demultiplexing insertion loss-P4.

The specific process of detecting the optical fiber to be detected by the active device and the passive device is shown in fig. 2, the active device can simultaneously monitor a plurality of different optical fiber circuits, the invention only explains the principle of the first optical fiber circuit, the monitoring principle of other optical fiber circuits is the same as that of the first optical fiber circuit, and the used components and circuit principles are the same.

The monitoring light source of the active equipment generates a light source for testing an optical fiber circuit, the wavelength of a detection light signal generated by the light source is different from the wavelength of a data service light signal generated on an optical fiber circuit of a user end A, so that the service data signal of the user end can be ensured not to be influenced, meanwhile, the dispersion coefficient of the detection light signal is lower, the loss of the optical power in the transmission process on the optical fiber to be tested is reduced, more accurate optical power information is obtained, and more accurate judgment is made; in addition, different wavelength signals can be conveniently processed by wave combination and wave division, so that the system has higher feasibility and lower input cost. Specifically, the optical signal wavelength is selected to be 1591nm, and the data traffic optical signal is selected to be 1310nm or 1550 nm.

Specifically, the detection optical signal is output to the optical switch, the optical switch can provide multiple schemes such as 2-way, 4-way, 8-way, 16-way and the like according to the application requirements of an actual scene, so that optical fiber monitoring resources are utilized to the maximum extent, the optical switch of 8-way or 16-way can be used at the concentrated station of the optical fiber line, the monitoring of one-way detection optical signal on multiple optical fiber lines can be realized, the investment of a detection system is saved, the optical switch of 2-way or 4-way can be used at the scattered station of the optical fiber line, the waste of a detection port is avoided, and the material cost investment can be reduced. The optical detection optical signal has influence on the power of the optical signal after passing through the optical switch, the optical switches with different paths have different influence on the power of the optical signal, and at this time, the first photodetector PD1 is needed to accurately collect the power value of the optical detection optical signal output from the optical switch, and the current optical power value of the optical signal is recorded as P1.

The optical detection module provides a multi-path service line interface, and can access user data information of a client A in a local OFD, the user data information enters the detection module, is divided into two optical paths of 1:99 by a wave splitter, and is used for detecting the power of 1% of detected optical signals of the data information by a second photoelectric detector PD2 and recording the optical power value of the current optical signals as P2.

The optical detection signal and the other 99% of service data signal light are multiplexed by a WDM (wavelength division multiplexing) device, the WDM device multiplexes the two groups of signals and outputs the signals to a circulator, the circulator transmits the optical signals output by the WDM device in a lossless manner, before the optical signals output by the circulator enter an optical fiber to be detected, a third photoelectric detector PD3 is needed to detect the optical power of the optical signals, and the current optical power value is recorded as P3. The optical signal output by the circulator is output to the port of the detection module and enters the optical fiber line to be detected, the port uses the optical fiber flange interface in the APC mode, the return loss generated when the port is not connected with the optical fiber of the line to be detected can be effectively eliminated, and misjudgment and errors are avoided.

The circulator can transmit optical signals output to an optical fiber line to be detected by the wavelength division multiplexer in a lossless manner, but can effectively strip optical signals output to the optical fiber line to be detected in the WDM direction at the position of the wavelength division multiplexer, after receiving the optical signals reflected by the optical fiber line to be detected from the opposite end, the circulator can effectively strip out the reflected detection optical signals, a fourth photoelectric detector PD4 is needed, optical power detection is carried out on the reflected detection optical signals, and the current optical power value is recorded as P4.

The optical fiber line to be tested transmits the optical detection signal to the optical fiber reflection module of the passive device.

As shown in fig. 3, after receiving the optical detection signal input by the optical fiber line to be detected, the optical fiber reflection module splits the wave through the WDM wavelength division demultiplexer, and the split optical detection signal passes through the reflector, and then is reflected back to the optical fiber line to be detected, and is transmitted back to the optical fiber monitoring module end; the service data information after the wave division is directly output to a line interface of a client B connected with a remote building ODF.

After the control module collects the optical powers P1, P2, P4 and P3, the calculation is performed by the following algorithm.

And the insertion loss value delta of the optical fiber line to be tested is P1-insertion loss of the wavelength division multiplexer-insertion loss of the wavelength division demultiplexer-P4.

In this example, the add/drop loss of the wavelength division multiplexer and the add/drop loss of the wavelength division demultiplexer are 1dB, the data can be well controlled when a system is designed, and whether the add/drop loss value meets the application requirement of the system can be judged according to the factors of an actual device.

According to the principle, the insertion loss of the optical fiber line to be measured is a value of the optical fiber line to be measured going back and forth once, and if the actual insertion loss of the optical fiber line to be measured is calculated, the actual insertion loss of the optical fiber line to be measured is delta/2.

And the distance L of the optical fiber line to be measured is equal to the insertion loss of the actual optical fiber line to be measured divided by the optical fiber loss.

The fiber loss is as follows, according to ITU-T standard, the dispersion loss of the standard G.652 single-mode fiber is generally about 0.35dB/km in 1310nm band and about 0.250.35dB/km in 1550nm band, and the data is relatively accurate within 50km according to the standard requirement.

As described above, the control module can determine whether the optical fiber line is usable according to the actual insertion loss of the optical fiber line to be tested and the distance of the optical fiber line to be tested, and the specific principle is as follows:

the optical fiber line insertion loss generally consists of insertion loss introduced by optical fiber self-transmission and insertion loss generated by an optical fiber transit point, and corresponding line insertion loss redundancy reserved in a line is considered in consideration of the complexity and the unknown of an actual line optical fiber line.

The insertion loss of each optical fiber switching point is generally 0.5dB, one line is calculated according to 4 switching points on average, and the insertion loss caused by the optical fiber switching points is 2 dB.

In practical optical fiber communication engineering applications, operators generally consider the insertion loss redundancy of an optical fiber line to be 2 dB.

Taking the distance of the optical fiber (1310nm signal) between stations as 10km as an example, the insertion loss of the optical fiber line is calculated as follows:

the insertion loss of the optical fiber line to be tested is 0.35 × 10+2+2, 7.5 (dB).

In practical engineering application, within a corresponding optical fiber distance, if a line insertion loss test is within an insertion loss range calculated as follows, the optical fiber line is considered to meet the requirements of engineering application.

Typical line distance insertion requirements are shown in table 1 below:

therefore, if the calculated line insertion loss and the calculated line distance are within the range of the table 1, the optical fiber to be tested is considered to be available, the information can be visually presented in a network control center, and the purpose that the optical fiber line can be managed in a machine room is achieved.

The optical power P2 can be used to determine whether there is a service in the subscriber line at the client a, according to the determination that the optical power at the location should be less than-15 dB when there is no data service, and the optical power at the location should be greater than-2 dB when there is data service, and report the information to the network management center.

And for the optical power P3, the optical power P3 is used for balancing whether the optical signal after WDM wave combination is normal or not, ensuring that the optical signal transmitted to the optical fiber line to be detected is available, judging that the optical signal is normal according to the condition that P3 is greater than P1, otherwise, judging that the optical detection module has a fault, and reporting the judgment information to a network management center.

The combination and principle of each component of the above-described example are explained and explained only for the first detection optical line, and the principle and implementation manner of the remaining optical fiber lines are the same as those of the first optical fiber line. For the sake of brevity, the technical features of the combination of the respective devices in the above examples are not described, however, as long as there is no contradiction between the combinations of the technical features, they are considered to be the scope set forth in the specification.

The device of the invention is accessed into ODF device and far-end building ODF device synthetically, on the design, the all-optical design is adopted, on the link, the passive optical design is adopted, and the device is composed of three-port junction wave separator, light separator, circulator and reflector, so the on-off of the link is independent of the power supply, the device is cut off, and no influence is caused to the service;

the ODF of the remote building adopts a passive design, does not need to take electricity, is convenient to deploy and maintain, and saves energy;

the invention adopts the independent monitoring design of each core, each path of light source is independent, and the light source can be used without configuration, thereby obtaining the availability of each path of fiber core and the on-line monitoring of the service.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.