阅读说明：本技术 一种无源波分故障检测系统 (Passive wavelength division fault detection system ) 是由 黄翠翠 郭志鹏 胡进 邵天民 张扬 于 2021-04-09 设计创作，主要内容包括：本发明公开了一种无源波分故障检测系统,包括：参比系统,所述参比系统位于待测系统的一侧,且参比系统中的光线路终端用于发射参比光线,同时参比光线依次通过光中继器、光放大器与波分复用器进行信号传输；待测系统,所述待测系统中的待测光纤发射器用于发射待测光线,且待测光线依次通过光时域反射仪、光环形器、光放大器与波分复用器进行信号传输；分光器,所述分光器设置在波分复用器的一侧,且分光器与检测仪之间设置有第二信号处理结构和第一信号处理结构。该无源波分故障检测系统,通过将待测光纤的抛物线图像与参比光纤的抛物线图像进行比对,即可检测出光纤在传输的过程中是否存在故障。(The invention discloses a passive wavelength division fault detection system, which comprises: the reference system is positioned on one side of the system to be measured, an optical line terminal in the reference system is used for emitting reference light, and meanwhile, the reference light sequentially passes through the optical repeater, the optical amplifier and the wavelength division multiplexer to carry out signal transmission; the system comprises a system to be tested, wherein a fiber emitter to be tested in the system to be tested is used for emitting light to be tested, and the light to be tested is subjected to signal transmission through an optical time domain reflectometer, an optical circulator, an optical amplifier and a wavelength division multiplexer in sequence; the optical splitter is arranged on one side of the wavelength division multiplexer, and a second signal processing structure and a first signal processing structure are arranged between the optical splitter and the detector. According to the passive wavelength division fault detection system, whether faults exist in the optical fiber in the transmission process can be detected by comparing the parabolic image of the optical fiber to be detected with the parabolic image of the reference optical fiber.)

1. A passive wavelength division fault detection system, comprising:

the reference system (1) is positioned on one side of the system to be tested (7), an optical line terminal (11) in the reference system (1) is used for emitting reference light, and the reference light sequentially passes through an optical repeater (13), an optical amplifier (15) and the wavelength division multiplexer (2) to carry out signal transmission;

the system to be tested (7) comprises a system to be tested (7), wherein a fiber emitter to be tested (73) in the system to be tested (7) is used for emitting light to be tested, and the light to be tested sequentially passes through an optical time domain reflectometer (72), an optical circulator (71), an optical amplifier (15) and a wavelength division multiplexer (2) for signal transmission;

the optical fiber coupling device comprises an optical splitter (3), wherein the optical splitter (3) is arranged on one side of the wavelength division multiplexer (2), and a second signal processing structure (6) and a first signal processing structure (4) are arranged between the optical splitter (3) and a detector (5).

2. A passive wavelength division fault detection system as defined in claim 1, wherein: the reference system (1) comprises an optical line terminal (11), an optical monitoring channel receiver (12), an optical repeater (13), an optical monitoring channel transmitter (14) and an optical amplifier (15), wherein the optical amplifier (15) is a nonlinear optical amplifier.

3. A passive wavelength division fault detection system as defined in claim 1, wherein: the system to be tested (7) comprises an optical circulator (71), an optical time domain reflector (72) and a fiber emitter to be tested (73).

4. A passive wavelength division fault detection system as defined in claim 1, wherein: the first signal processing structure (4) is consistent with the second signal processing structure (6) in composition structure, the first signal processing structure (4) is composed of a filter (41) and a coupler (42), the adjusting frequency difference of the filter (41) is 0.15-30MHz, and the return loss of the coupler (42) is 45 dB.

5. A passive wavelength division fault detection system as defined in claim 1, wherein: the wavelength division multiplexer (2) transmits signals through the optical splitter (3) respectively through the first signal processing structure (4), the second signal processing structure (6) and the wavelength detector (5).

6. A passive wavelength division fault detection system as defined in claim 1, wherein: the wavelength division multiplexer (2) and the optical splitter (3) are connected in series, the insertion loss of the optical splitter (3) is 0.2dB, and the return loss of the optical splitter (3) is 45 dB.

7. A passive wavelength division fault detection system as defined in claim 1, wherein: the detection wavelength range of the wavelength detector (5) is between 1000 and 2000 nm.

8. A passive wavelength division fault detection system as defined in claim 2, wherein: the optical line terminal (11), the optical monitoring channel receiver (12), the optical repeater (13), the optical monitoring channel transmitter (14) and the optical amplifier (15) are sequentially arranged in series, and the service environment temperature of the optical amplifier (15) is-20-65 ℃.

Technical Field

The invention relates to the technical field of passive wavelength division multiplexing network optical fiber fault detection systems, in particular to a passive wavelength division fault detection system.

Background

At present, the techniques for implementing WDM network optical fiber fault detection by using chaotic laser as a detection light source in experiments mainly include: the method comprises the steps of utilizing chaotic laser generated by an optical feedback multimode laser to realize optical fiber fault detection with 24km and 2cm resolution [ journal of lightwave technology, vol.30, No.21, pp.3420-3426, 2012], utilizing self-feedback lasers with a plurality of different wavelengths to generate chaotic laser to realize optical fiber fault detection with 20 km and 1.8cm spatial resolution on line [ optics communications, vol.350, p.288-295, 2015], and utilizing chaotic laser generated by an optical chaotic direct modulation multimode laser to realize optical fiber fault detection with 75km and 14cm distance resolution [ microwaveand optical technology gyLetters, vol.57, No.11, pp.2502-2506, 2015 ].

However, when the above-mentioned technology is used to detect a fault in an optical fiber, a chaotic laser band generated by optical feedback has "side lobes" (i.e., length information fed back by an external cavity), which can cause detection misjudgment, and is limited by the fact that the bandwidth of the chaotic laser generated by the modulation depth of the electrical modulation is too narrow, and thus fault location with higher precision cannot be realized; therefore, it is necessary to invent a high-precision optical fiber fault detection system based on WDM-POM to solve the problems of false alarm (misjudgment), short distance and poor precision of the existing chaotic optical time domain reflectometer technology.

After retrieval, the prior art discloses (application number: CN201910965258.8) a passive wavelength division multiplexing network optical fiber fault detection system and a detection method thereof, wherein the system comprises a chaotic laser generator, a signal output end of the chaotic laser generator is connected with a second input end of a first optical circulator, and a signal output end of the first optical circulator is connected with an optical isolator in series and then is connected with an input end of a first optical fiber coupler; the first output end of the first optical fiber coupler is connected with the input end of the phase modulator after being sequentially connected with the polarization controller and the optical attenuator in series, and the output end of the phase modulator is connected with the first input end of the first optical circulator; the fault detection mode for the optical fiber is too complex, and the manufacturing cost is higher.

Disclosure of Invention

The invention provides a passive wavelength division fault detection system for making up market vacancy.

The present invention is directed to a passive wavelength division fault detection system to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: a passive wavelength division fault detection system, comprising:

the reference system is positioned on one side of the system to be measured, an optical line terminal in the reference system is used for emitting reference light, and meanwhile, the reference light sequentially passes through the optical repeater, the optical amplifier and the wavelength division multiplexer to carry out signal transmission;

the system comprises a system to be tested, wherein a fiber emitter to be tested in the system to be tested is used for emitting light to be tested, and the light to be tested is subjected to signal transmission through an optical time domain reflectometer, an optical circulator, an optical amplifier and a wavelength division multiplexer in sequence;

the optical splitter is arranged on one side of the wavelength division multiplexer, and a second signal processing structure and a first signal processing structure are arranged between the optical splitter and the detector.

Further, the reference system comprises an optical line terminal, an optical monitoring channel receiver, an optical repeater, an optical monitoring channel transmitter and an optical amplifier, and the optical amplifier is a nonlinear optical amplifier.

Furthermore, the system to be tested comprises an optical circulator, an optical time domain reflectometer and a fiber optic transmitter to be tested, wherein the model of the optical circulator is FBY-FOC 3P-13/15.

Furthermore, the first signal processing structure is consistent with the second signal processing structure in composition structure, and the first signal processing structure is composed of a filter and a coupler, the adjusting frequency difference of the filter is 0.15-30MHz, and the return loss of the coupler is 45 dB.

Furthermore, the wavelength division multiplexer transmits signals through the first signal processing structure, the second signal processing structure and the wavelength detector respectively through the optical splitter.

Furthermore, the wavelength division multiplexer and the optical splitter are connected in series, the insertion loss of the optical splitter is 0.2dB, and the return loss of the optical splitter is 45 dB.

Further, the detection wavelength range of the wavelength detector is between 1000 and 2000 nm.

Further, the optical line terminal, the optical monitoring channel receiver, the optical repeater, the optical monitoring channel transmitter and the optical amplifier are sequentially arranged in series, and the service environment temperature of the optical amplifier is-20-65 ℃.

Compared with the prior art, the invention has the beneficial effects that: the display screen of the wavelength detector can display a parabolic image of the reference optical fiber; similarly, the optical fiber to be detected is transmitted to the wavelength detector under the action of the second signal processing structure through the wavelength division multiplexer and the optical splitter, and a display screen of the wavelength detector can display a parabolic image of the optical fiber to be detected; whether the optical fiber has a fault in the transmission process can be detected by comparing the parabolic image of the optical fiber to be detected with the parabolic image of the reference optical fiber, and the detection mode is simple, convenient, effective and quick.

Drawings

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is a schematic imaging view of a reference fiber constructed in accordance with the present invention;

FIG. 3 is a schematic diagram of an imaging of a fiber under test according to the present invention;

FIG. 4 is a logical view of the structure of FIG. 1.

In the figure: 1. a reference system; 11. an optical line terminal; 12. an optical supervisory channel receiver; 13. an optical repeater; 14. an optical supervisory channel transmitter; 15. an optical amplifier; 2. a wavelength division multiplexer; 3. a light splitter; 4. a first signal processing structure; 41. a filter; 42. a coupler; 5. a wavelength detector; 6. a second signal processing structure; 7. a system to be tested; 71. an optical circulator; 72. an optical time domain reflectometer; 73. and the optical fiber emitter to be tested.

Detailed Description

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.

The first embodiment is as follows: referring to fig. 1-4, the present invention provides a technical solution: a passive wavelength division failure detection system is provided,

the method comprises the following steps: a reference system 1, a system to be measured 7 and a spectrometer 3;

the reference system 1 is positioned at one side of the system to be measured 7, an optical line terminal 11 in the reference system 1 is used for emitting reference light, and meanwhile, the reference light sequentially passes through an optical repeater 13, an optical amplifier 15 and the wavelength division multiplexer 2 for signal transmission;

the optical fiber transmitter to be measured 73 in the system to be measured 7 is used for transmitting light to be measured, and the light to be measured sequentially passes through the optical time domain reflectometer 72, the optical circulator 71, the optical amplifier 15 and the wavelength division multiplexer 2 for signal transmission;

the optical splitter 3 is arranged at one side of the wavelength division multiplexer 2, and a second signal processing structure 6 and a first signal processing structure 4 are arranged between the optical splitter 3 and the detector 5.

The normal reference optical fiber is transmitted to an optical amplifier 15 through an optical line terminal 11 under the relay action of an optical repeater 13, the optical amplifier 15 amplifies an optical signal and then transmits the optical signal to a wavelength division multiplexer 2, the reference optical fiber is input to a wavelength detector 5 through a first signal processing structure 4 through an optical splitter 3 for detection, and after the detection is finished, a parabolic image of the reference optical fiber can be displayed on a display screen of the wavelength detector 5; similarly, the optical fiber to be detected is transmitted to the wavelength detector 5 through the wavelength division multiplexer 2 and the optical splitter 3 under the action of the second signal processing structure 6, and a parabolic image of the optical fiber to be detected can be displayed on a display screen of the wavelength detector 5; whether the optical fiber has a fault in the transmission process can be detected by comparing the parabolic image of the optical fiber to be detected with the parabolic image of the reference optical fiber.

The second embodiment is as follows: as shown in fig. 1, the reference system 1 includes an optical line terminal 11, an optical supervisory channel receiver 12, an optical repeater 13, an optical supervisory channel transmitter 14, and an optical amplifier 15, and the optical amplifier 15 is a nonlinear optical amplifier.

The third concrete implementation mode: as shown in fig. 1, the system under test 7 includes an optical circulator 71, an optical time domain reflectometer 72, and a fiber optic transmitter under test 73, and the model of the optical circulator 71 is FBY-FOC 3P-13/15.

The fourth concrete implementation mode: as shown in fig. 1, the first signal processing structure 4 and the second signal processing structure 6 are identical in composition, the first signal processing structure 4 is composed of a filter 41 and a coupler 42, the adjusted frequency difference of the filter 41 is 0.15-30MHz, and the return loss of the coupler 42 is 45 dB.

The fifth concrete implementation mode: in this embodiment, as further limiting to the first embodiment, as shown in fig. 1, the wavelength division multiplexer 2 transmits signals through the first signal processing structure 4, the second signal processing structure 6 and the wavelength detector 5 via the optical splitter 3.

The sixth specific implementation mode: as shown in fig. 1, the wavelength division multiplexer 2 and the optical splitter 3 are connected in series, the insertion loss of the optical splitter 3 is 0.2dB, and the return loss of the optical splitter 3 is 45 dB.

The seventh embodiment: as shown in FIG. 1, the wavelength detection device 5 has a detection wavelength range between 1000 and 2000 nm.

The specific implementation mode is eight: as shown in fig. 1, the optical line terminal 11, the optical supervisory channel receiver 12, the optical repeater 13, the optical supervisory channel transmitter 14 and the optical amplifier 15 are sequentially arranged in series, and the temperature of the environment where the optical amplifier 15 is used is-20 to 65 ℃.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.