CN116318409A - Optical repeater optical path structure and pump backup architecture - Google Patents

Optical repeater optical path structure and pump backup architecture Download PDF

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Publication number
CN116318409A
CN116318409A CN202310098363.2A CN202310098363A CN116318409A CN 116318409 A CN116318409 A CN 116318409A CN 202310098363 A CN202310098363 A CN 202310098363A CN 116318409 A CN116318409 A CN 116318409A
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China
Prior art keywords
optical
optical coupler
transmission route
coupler
pump
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CN202310098363.2A
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Chinese (zh)
Inventor
李健源
陈燕丽
蒋小庆
梅传志
张伟
康健
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Fenghuo Ocean Network Equipment Co ltd
Fiberhome Telecommunication Technologies Co Ltd
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Fenghuo Ocean Network Equipment Co ltd
Fiberhome Telecommunication Technologies Co Ltd
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Priority to CN202310098363.2A priority Critical patent/CN116318409A/en
Publication of CN116318409A publication Critical patent/CN116318409A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0771—Fault location on the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application relates to an optical repeater optical path structure and a pump backup architecture, which comprise a forward transmission route and a reverse transmission route; the forward transmission route and the reverse transmission route comprise a first optical amplifier, a gain flattening filter with an isolator and a second optical amplifier which are sequentially connected along the optical transmission direction; the optical repeater optical path structure also comprises a narrow-band filter, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter; the forward transmission route further comprises at least one of a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises at least one of the first optical coupler and the fifth optical coupler, the first optical coupler is located upstream of the first optical amplifier, and the fifth optical coupler is located downstream of the second optical amplifier along the optical transmission direction. The method forms a marine cable link fault positioning COTDR coherent detection path in the forward and reverse universe, can detect complete communication routes, and realizes long-span detection.

Description

Optical repeater optical path structure and pump backup architecture
Technical Field
The application relates to the technical field of submarine communication, in particular to an optical repeater optical path structure and a pump backup architecture.
Background
From the global data exchange implementation way, as international and regional main communication transmission equipment, the submarine optical cable bears 90% of international communication service and is a main carrier for the rapid development of the global information optical communication industry, so that the ocean communication transmission system is still the preferred mode of the current trans-regional transmission. As the most core equipment for realizing long-distance networking with a relayed submarine communication network, a submarine repeater is evolving toward satisfying a larger fiber log and a longer transmission distance.
The submarine communication is mainly characterized by long communication distance, large transmission capacity and long system operation life, and is always an application place of the new optical fiber communication technology. Therefore, the submarine Repeater (RPT) is required to amplify the power of the optical signal of the long-distance submarine cable transmission system to compensate the attenuation of the signal after long-distance transmission, and the product achieves high threshold because the requirements of 8000m water depth and 25 years of operation life are met.
The submarine optical cable transmits more than 95% of transoceanic service, the fault of the submarine cable system can cause huge economic loss, and the submarine optical cable system has high maintenance cost and great difficulty, so the reliability requirements on the submarine optical repeater and the submarine optical cable are very high, in the submarine repeater, the failure rate of the pumping laser is the first, and in order to improve the reliability of the optical path system, the submarine optical repeater generally adopts a redundant design to the submarine optical repeater so as to prevent the condition of communication interruption in the whole optical path caused by the failure of a single laser.
In one aspect, undersea repeaters typically use 980nm wavelength pump lasers to provide pump energy and use erbium-doped fiber (EDF) as the gain medium to achieve optical amplification. In order to improve the reliability of the optical repeater, the circuit generally adopts that the power supplies of all fiber pairs of amplifying units are mutually backed up, the optical path adopts optical pumping sharing backup, each fiber pair is provided with two pumping lasers in two paths of amplifying mode, the two pumping lasers are connected through an optical fiber Coupler (Coupler) with a 2×2 structure, and each pumping laser provides 50% of pumping energy for each of the two paths of optical amplifiers. The defect that exists in this kind of mode is that when one of them pumping fails, also can seriously influence the optical amplification output, and 2 x 2 architectures have used the multi-wave to concentrate the coupler simultaneously, and the device once the inefficacy is reported to be the whole inefficacy, and the reliability is low.
On the other hand, for the problem of submarine cable link fault location, coherent optical time domain transmitter (COTDR) technology is most commonly adopted. The COTDR technology is similar to the existing optical time domain reflectometer (OTDR, optical Time Domain Reflector) principle, and uses rayleigh scattering and fresnel reflection to characterize the optical fiber, and is different from the OTDR principle in that the COTDR technology adopts coherent detection at a receiving end to improve the signal-to-noise ratio of a received signal. Because the submarine repeater is internally provided with a unidirectional isolator, the COTDR reflected and scattered light cannot be returned to the COTDR instrument input port for detection, a reliable COTDR optical loop is required to be customized to realize the transmission of reverse COTDR signals, and an O-O structure is adopted later, so that the structure has high complexity and can reduce output power, and the reverse final optical relay amplifying structure cannot be detected and can only be applied to short-span transmission.
In addition, the existing submarine repeater amplifying light path structure comprises double-pump double-stage erbium fiber amplification, single-pump single-stage erbium fiber amplification and reverse-pump single-stage erbium fiber amplification, but the cost and the heat dissipation control, the saturated output of the optical amplification and the indexes of noise index cannot be considered. For example, the cost of the double-pump double-stage erbium fiber amplifying structure can be doubled, and the double-pump double-stage erbium fiber amplifying structure is high in cost and unfavorable for heat dissipation control when applied to a submarine repeater; the single-pump single-stage erbium fiber amplification structure has small gain and can not provide enough saturated output; the noise figure of the reverse pumping single-stage erbium fiber amplifying structure is high.
Disclosure of Invention
The embodiment of the application provides an optical repeater optical path structure and a pumping backup architecture, which utilize a narrow-band filter between a forward transmission route and a reverse transmission route, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter to realize connection of the forward transmission route and the reverse transmission route, form a forward and reverse universe submarine cable link fault positioning COTDR coherent detection path of an O-I structure, detect complete communication routes, and use a high-performance COTDR narrow-band filter in the path to reduce the influence of detection light on the reverse link, reduce the loss of a COTDR scattered optical link and realize long-span detection.
In a first aspect, there is provided an optical repeater optical path structure comprising:
the optical transmission directions of the forward transmission route and the reverse transmission route are opposite;
the forward transmission route and the reverse transmission route both comprise a gain flattening filter with an isolator and two optical amplifiers, wherein the two optical amplifiers are a first optical amplifier and a second optical amplifier respectively, and the first optical amplifier, the gain flattening filter with the isolator and the second optical amplifier are sequentially connected along the optical transmission direction;
the optical repeater optical path structure further comprises a narrow-band filter, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter;
the forward transmission route further comprises at least one of a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises at least one other of the first optical coupler and the fifth optical coupler, the first optical coupler is located upstream of the first optical amplifier, and the fifth optical coupler is located downstream of the second optical amplifier along the optical transmission direction.
In some embodiments, the forward transmission route further includes a first optical coupler, and the reverse transmission route further includes a fifth optical coupler, where the first optical coupler of the forward transmission route and the fifth optical coupler of the reverse transmission route are connected through a narrowband filter;
or the forward transmission route further comprises a fifth optical coupler, the reverse transmission route further comprises a first optical coupler, and the fifth optical coupler of the forward transmission route is connected with the first optical coupler of the reverse transmission route through a narrow-band filter;
or the forward transmission route further comprises a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises the first optical coupler and the fifth optical coupler, the first optical coupler of the forward transmission route is connected with the fifth optical coupler of the reverse transmission route through a narrow-band filter, and the fifth optical coupler of the forward transmission route is connected with the first optical coupler of the reverse transmission route through the narrow-band filter.
In some embodiments, the first and fifth optocouplers employ 10:1 optocouplers.
In some embodiments, the first optical amplifier and the second optical amplifier share the same pump light.
In some embodiments, along the optical transmission direction, the first optical amplifier includes a first isolator, a second optical coupler, a first erbium-doped fiber, and a third optical coupler that are sequentially connected, where the second optical coupler is configured to receive one path of pump light and optically couple with the service;
the second optical amplifier comprises a fourth optical coupler, a second erbium-doped fiber and a second isolator along the optical transmission direction;
and the third optical coupler and the fourth optical coupler are connected through a through short-circuit optical fiber.
In some embodiments, the second, third and fourth optocouplers employ wavelength division multiplexers.
In a second aspect, a pump backup architecture is provided, comprising: pump laser, sixth optical coupler and connecting optical fiber, the number of pump lasersThe amount is 2 n+2 The number of the sixth optocouplers is (n+2). Times.2 n+1 N is 0 or a positive integer, the connecting optical fiber connects the pump laser and the sixth optical coupler, and the output of the connecting optical fiber is 2 n+2 The pump light is used in the input optical amplifier, and each pump light contains 2 n+2 2 of the pump light output by each of the pump lasers -(n+2) % energy.
In some embodiments, the optical amplifier is an optical amplifier in an optical repeater optical path structure as described in any of the above.
In some embodiments, n has a value of 1.
In some embodiments, the sixth optical coupler is a 2×2 optical coupler, where the 2×2 optical coupler has two input ends and two output ends, and the 2×2 optical coupler is used to couple the pump light output by the two pump lasers into the 2×2 optical coupler, and outputs one pump light through the two output ends respectively.
The beneficial effects that technical scheme that this application provided brought include:
the embodiment of the application provides an optical repeater optical path structure and a pump backup architecture, which utilize a narrow-band filter between a forward transmission route and a reverse transmission route, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter to realize connection of the forward transmission route and the reverse transmission route, form a forward and reverse universe submarine cable link fault positioning COTDR coherent detection path of an O-I structure, detect a complete communication route, and use a high-performance COTDR narrow-band filter in the path to reduce the influence of detection light on the reverse link, reduce the loss of a COTDR scattered optical link and realize long-span detection.
In the application, two optical amplifiers jointly form a high-power unidirectional pumping and double-section erbium fiber gain amplifying structure, the pumping first-stage erbium fiber amplifying provides high gain and low noise, the pumping second-stage amplifying provides high output power, and the structure can effectively reduce noise figure and provide larger output power. The high-power unidirectional pump has low cost and low power consumption, is beneficial to the heat dissipation and stability requirements of products, is beneficial to reducing noise index below 4.5dB, and can provide larger output power compared with a single-section erbium fiber, and the average of the gain of the double-section erbium fiber can be improved by about 3dB. Because the erbium-doped optical fiber has different gains for different wavelengths, which results in different amplified single-wave power, the application uses the gain flattening filter IGFF with the isolator ISO to balance the power of each wavelength, and the IGFF is arranged between two sections of erbium-doped optical fibers, thereby not only avoiding the problem that the noise index of a high gain area becomes high due to the arrangement of the IGFF at the input end of the erbium-doped optical fiber, but also avoiding the problem that the energy conversion efficiency of the erbium-doped optical fiber is reduced due to the direct attenuation of the output service spectrum by the output end of the erbium-doped optical fiber, saving too much isolators, and miniaturizing the device package.
In the present application, 2 of output n+2 Lu Bengpu the energy of the light is 2 n+2 The pump lasers are provided together, each pump laser is 2 n+2 The pump light supplies 2 -(n+2) % energy. When one or more pump lasers fail or one or more sixth optical couplers fail, specific optical path pumps are not directly caused to be free of light, service interruption is caused, meanwhile, 2X 2 optical couplers are adopted for series-parallel connection, the problem of overall failure of functions caused by centralized coupling is avoided, and the requirement of long-term operation of a communication system is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical path structure of an optical repeater according to an embodiment of the present application;
fig. 2 is a schematic diagram of a COTDR coherent detection path according to an embodiment of the present application;
fig. 3 is a schematic diagram of an optical repeater optical path structure connection pump backup architecture according to an embodiment of the present application;
fig. 4 is a schematic diagram of a pump backup architecture according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Referring to fig. 1, 2 and 3, an embodiment of the present application provides an optical repeater optical path structure, where the optical repeater optical path structure includes a forward transmission route and a reverse transmission route, and the optical transmission directions of the forward transmission route and the reverse transmission route are opposite; the forward transmission route and the reverse transmission route both comprise a gain flattening filter (IGFF in figure 1) with an isolator and two optical amplifiers, wherein the two optical amplifiers are a first optical amplifier and a second optical amplifier respectively, and the first optical amplifier, the gain flattening filter with the isolator and the second optical amplifier are sequentially connected along the optical transmission direction; the optical repeater optical path structure also comprises a narrow-band filter, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter; the forward transmission route further comprises at least one of a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises at least one of the first optical coupler and the fifth optical coupler, the first optical coupler is located upstream of the first optical amplifier, and the fifth optical coupler is located downstream of the second optical amplifier along the optical transmission direction.
The first optocoupler and the fifth optocoupler use 10:1 optocouplers. The optical coupler has the advantages that the 10:1 optical coupler brings about 10 log (0.1) =10 dB insertion loss to the COTDR wavelength which is combined by the narrow-band filter or split to the narrow-band filter, but only 10 log (0.9) =0.46 dB insertion loss to 1550nm main service light, so that the minimum insertion loss to the main service light is ensured, and meanwhile, the attenuation of COTDR reflected back light after passing through the fifth optical coupler, the narrow-band filter and the first optical coupler is controlled to be about 21.5dB, so that the light received by the COTDR receiver is in a sensitivity range.
The two optical paths may be connected by a narrow-band filter, for example, the forward transmission route further includes a first optical coupler, the reverse transmission route further includes a fifth optical coupler, and the first optical coupler of the forward transmission route and the fifth optical coupler of the reverse transmission route are connected by the narrow-band filter.
As another example, the forward transmission route further includes a fifth optical coupler, and the reverse transmission route further includes a first optical coupler, where the fifth optical coupler of the forward transmission route and the first optical coupler of the reverse transmission route are connected by a narrow band filter.
Alternatively, the two optical paths may be connected by two narrowband filters, for example, as shown in fig. 1, where the forward transmission route further includes a first optical coupler and a fifth optical coupler, the reverse transmission route further includes a first optical coupler and a fifth optical coupler, the first optical coupler of the forward transmission route and the fifth optical coupler of the reverse transmission route are connected by the narrowband filters, and the fifth optical coupler of the forward transmission route and the first optical coupler of the reverse transmission route are connected by the narrowband filters.
According to the optical repeater optical path structure, between the forward transmission route and the reverse transmission route, the first optical coupler and the fifth optical coupler which are connected through the narrow-band filter are utilized to realize connection of the forward transmission route and the reverse transmission route, a forward and reverse universe submarine cable link fault positioning COTDR coherent detection path of an O-I structure is formed, a complete communication route can be detected, the influence of detection light on the reverse link can be reduced by using the high-performance COTDR narrow-band filter in the path, COTDR scattered light link loss can be reduced, and long-span detection is realized.
Specifically, referring to fig. 1 and 2, in the forward transmission route, an optical wavelength signal sent by a transmitting end of a COTDR of the coherent optical time domain transmitter is output along with a 1550nm service optical signal through a second optical amplifier and a fifth optical coupler, then the optical wavelength signal returns through a rayleigh scattering and reflection light obtained through 100 km-120 km optical fibers, and after passing through a fifth coupler in the forward transmission route, the optical wavelength signal reaches a narrow-band filter, then enters the reverse transmission route from a first optical coupler of the reverse transmission route, and is input into a first optical amplifier in the reverse transmission route together with 1550nm service optical in the reverse transmission route, and is reversely transmitted to a receiving end of the COTDR of the coherent optical time domain transmitter, so that the amplifier of the reverse transmission route can compensate the loss of COTDR in a reverse scattering mode, and can enable COTDR to detect a system with a length of more than 120km in each section, and whether the reverse transmission route is normal or not is synchronously detected, the narrow-band filter filters side waves of the COTDR wavelength, and the influence on the service optical signal can be effectively reduced when the service optical light in the reverse transmission route is mixed.
In fig. 2, the third optical amplifier on the forward transmission route and the reverse transmission route indicates that the next station amplifier is connected to the optical path structure of the repeater in the forward and reverse directions.
Meanwhile, relative to the O-O structure of the COTDR, the forward amplification output port of the forward transmission route is directly connected with the reverse amplification output port of the reverse transmission route, the COTDR optical power amplifier adopts the O-I structure, the second optical amplifier of the forward transmission route is used as an output O port, the first optical amplifier of the reverse transmission route is used as an input I port, and the COTDR optical power amplifier outputs the amplified output O port of the forward transmission route to the amplified input I port of the reverse transmission route.
Referring to fig. 1, in some preferred embodiments, the first optical amplifier and the second optical amplifier share the same pump light. Specifically, along the optical transmission direction, the first optical amplifier comprises a first isolator, a second optical coupler, a first erbium-doped optical fiber and a third optical coupler which are sequentially connected, wherein the second optical coupler is used for receiving one path of pump light and is optically coupled with the service; along the optical transmission direction, the second optical amplifier comprises a fourth optical coupler, a second erbium-doped optical fiber and a second isolator, and the third optical coupler is connected with the fourth optical coupler through a through short-circuit optical fiber. The second, third and fourth optocouplers employ wavelength division multiplexers.
As shown in fig. 1, in the forward transmission route, 1550nm service light passes through the first optical coupler and the first isolator, then is coupled with 980nm pump light through the second optical coupler, and is amplified through the first erbium-doped optical fiber, and 1550nm service light outputs a high-gain low-noise amplified signal.
After 1550nm service light and 980nm pump light which is remained after passing through the first erbium-doped optical fiber are separated through a third optical coupler, 1550nm service light is subjected to gain spectrum adjustment through an IGFF, so that the spectrum which is finally output by the amplifier is flat (wherein the IGFF can be made of a thin film filter material to improve reliability), the 980nm pump light which is remained after being separated through the third optical coupler is in direct short circuit, and then is subjected to optical synthesis with 1550nm service after being shaped through a fourth optical coupler.
The light combined by the fourth optical coupler is amplified again by the second erbium-doped optical fiber, and then the amplified 1500nm service light passes through the second isolator (isolating the remaining 980nm pump light and the back-end line reflected light) and is output after passing through the fifth optical coupler.
In this embodiment, the two optical amplifiers together form a "high-power unidirectional pump+dual-section erbium fiber gain" amplifying structure, the pump first-stage erbium fiber amplification provides high gain and low noise, and the pump second-stage amplification provides high output power. The high-power unidirectional pump has low cost and low power consumption, is beneficial to the heat dissipation and stability requirements of products, is beneficial to reducing noise index below 4.5dB, and can provide larger output power compared with a single-section erbium fiber, and the average of the gain of the double-section erbium fiber can be improved by about 3dB. Because the erbium-doped optical fiber has different gains for different wavelengths, which results in different amplified single-wave power, the application uses the gain flattening filter IGFF with the isolator ISO to balance the power of each wavelength, and the IGFF is arranged between two sections of erbium-doped optical fibers, thereby not only avoiding the problem that the noise index of a high gain area becomes high due to the arrangement of the IGFF at the input end of the erbium-doped optical fiber, but also avoiding the problem that the energy conversion efficiency of the erbium-doped optical fiber is reduced due to the direct attenuation of the output service spectrum by the output end of the erbium-doped optical fiber, saving too much isolators, and miniaturizing the device package.
As can be seen in figures 3 and 4,the embodiment of the application also provides a pump backup architecture, which comprises pump lasers, a sixth optical coupler and connecting optical fibers, wherein the number of the pump lasers is 2 n+2 The number of the sixth optocouplers is (n+2). Times.2 n+1 N is 0 or a positive integer, and the pump laser is connected with the sixth optical coupler by the connecting optical fiber, and 2 is output by all the sixth optical couplers n+2 Lu Bengpu each pump light contains 2 n+2 2 of the pump light output by each of the pump lasers -(n+2) % energy. The pump light output by the sixth optical coupler is used for being input into the optical amplifier so as to amplify the service light. The sixth optical coupler adopts a 2×2 optical coupler, the 2×2 optical coupler is provided with two input ends and two output ends, and the 2×2 optical coupler is used for coupling the pump light output by the two pump lasers into the 2×2 optical coupler and respectively outputting one path of pump light through the two output ends.
In the present embodiment, 2 of output n+2 Lu Bengpu the energy of the light is 2 n+2 The pump lasers are provided together, each pump laser is 2 n+2 The pump light supplies 2 -(n+2) % energy. When one or more pump lasers fail or one or more sixth optical couplers fail, specific optical path pumps are not directly caused to be free of light, service interruption is caused, meanwhile, 2X 2 optical couplers are adopted for series-parallel connection, the problem of overall failure of functions caused by centralized coupling is avoided, and the requirement of long-term operation of a communication system is ensured.
Referring to fig. 3 and 4, in a preferred embodiment, n has a value of 1. I.e. 8 pump lasers in total and denoted pump laser 1, pump laser 2, pump laser 3. Pump laser 8, 12 sixth optocouplers, arranged in a 4 x 3 array and denoted sixth optocoupler 1, sixth optocoupler 2, sixth optocoupler 3.
The 8 pump lasers were cross-mixed by 12 separate 2 x 2 optocouplers. The pump light generated by the pump laser 1 and the pump laser 2 passes through a sixth optical coupler 1, the pump light generated by the pump laser 3 and the pump laser 4 passes through a sixth optical coupler 2, and the two independent sixth optical couplers 1 and 2 are cross-connected with the other two independent sixth optical couplers 5 and 6, so that 50% of the energy of each of the pump laser 1, the pump laser 2, the pump laser 3 and the pump laser 4 is combined together to be re-split and output, and each of the four output mixed pump light paths contains 25% of the energy of the pump light of the previous pump lasers 1-4.
The pump lasers 5-8 are also cross-connected through sixth optical couplers 3, 4, 7 and 8 to output four paths of pump light.
The sixth optical couplers 9, 10, 11 and 12 at the rear stage are in cross connection with the sixth optical couplers 5, 6, 7 and 8 at the front stage to output, the output light of 8 paths is divided by the sixth optical couplers 9, 10, 11 and 12 to provide pumping energy for the optical amplifying optical paths of 4 fiber pairs, and each path of final output light contains 12.5% of the original 8 pumping energy, and the 8 energy is combined into 100% energy to be output, so that a pumping sharing backup structure of an 8 x 8 architecture and a structure of improving the reliability by connecting one or more of the optical couplers in series and parallel can still ensure that each optical path can be amplified normally when one or more pumping fails or one or more of the sixth optical couplers fails.
Referring to fig. 3, the pump backup architecture provided in the foregoing embodiment is applied to the optical repeater optical path structure provided in the foregoing embodiment, and the pump light output by the pump backup architecture is used to provide pump light for an optical amplifier in the optical repeater optical path structure, amplify 1550nm service light, and use a plurality of sixth optical couplers to split pump coupling, so that the problem that if the optical couplers fail when a single optical coupler is used, the whole fails can be prevented.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An optical repeater optical path structure, comprising:
the optical transmission directions of the forward transmission route and the reverse transmission route are opposite;
the forward transmission route and the reverse transmission route both comprise a gain flattening filter with an isolator and two optical amplifiers, wherein the two optical amplifiers are a first optical amplifier and a second optical amplifier respectively, and the first optical amplifier, the gain flattening filter with the isolator and the second optical amplifier are sequentially connected along the optical transmission direction;
the optical repeater optical path structure further comprises a narrow-band filter, and a first optical coupler and a fifth optical coupler which are connected through the narrow-band filter;
the forward transmission route further comprises at least one of a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises at least one other of the first optical coupler and the fifth optical coupler, the first optical coupler is located upstream of the first optical amplifier, and the fifth optical coupler is located downstream of the second optical amplifier along the optical transmission direction.
2. The optical repeater optical path structure of claim 1, wherein:
the forward transmission route further comprises a first optical coupler, the reverse transmission route further comprises a fifth optical coupler, and the first optical coupler of the forward transmission route is connected with the fifth optical coupler of the reverse transmission route through a narrow-band filter;
or the forward transmission route further comprises a fifth optical coupler, the reverse transmission route further comprises a first optical coupler, and the fifth optical coupler of the forward transmission route is connected with the first optical coupler of the reverse transmission route through a narrow-band filter;
or the forward transmission route further comprises a first optical coupler and a fifth optical coupler, the reverse transmission route further comprises the first optical coupler and the fifth optical coupler, the first optical coupler of the forward transmission route is connected with the fifth optical coupler of the reverse transmission route through a narrow-band filter, and the fifth optical coupler of the forward transmission route is connected with the first optical coupler of the reverse transmission route through the narrow-band filter.
3. The optical repeater optical path structure of claim 1, wherein:
the first optical coupler and the fifth optical coupler adopt 10:1 optical couplers.
4. The optical repeater optical path structure of claim 1, wherein:
the first optical amplifier and the second optical amplifier share the same pump light.
5. The optical repeater optical path structure of claim 4 wherein:
the first optical amplifier comprises a first isolator, a second optical coupler, a first erbium-doped optical fiber and a third optical coupler which are sequentially connected along the optical transmission direction, wherein the second optical coupler is used for receiving one path of pump light and is optically coupled with the service;
the second optical amplifier comprises a fourth optical coupler, a second erbium-doped fiber and a second isolator along the optical transmission direction;
and the third optical coupler and the fourth optical coupler are connected through a through short-circuit optical fiber.
6. The optical repeater optical path structure of claim 5 wherein:
the second optical coupler, the third optical coupler and the fourth optical coupler adopt wavelength division multiplexers.
7. A pump backup architecture, comprising: pump lasers, a sixth optical coupler and a connecting optical fiber, wherein the number of the pump lasers is 2 n+2 The number of the sixth optocouplers is (n+2). Times.2 n+1 N is 0 or a positive integer, the connecting optical fiber connects the pump laser and the sixth optical coupler, and the output of the connecting optical fiber is 2 n+2 The pump light is used in the input optical amplifier, and each pump light contains 2 n+2 2 of the pump light output by each of the pump lasers -(n+2) % energy.
8. The pump backup architecture of claim 7, wherein:
the optical amplifier is an optical amplifier in the optical repeater optical path structure as claimed in any one of claims 1 to 6.
9. The pump backup architecture of claim 7, wherein:
n takes on the value 1.
10. The pump backup architecture of claim 7, wherein:
the sixth optical coupler adopts a 2×2 optical coupler, the 2×2 optical coupler is provided with two input ends and two output ends, and the 2×2 optical coupler is used for coupling the pump light output by the two pump lasers into the 2×2 optical coupler and respectively outputting one path of pump light through the two output ends.
CN202310098363.2A 2023-02-10 2023-02-10 Optical repeater optical path structure and pump backup architecture Pending CN116318409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310098363.2A CN116318409A (en) 2023-02-10 2023-02-10 Optical repeater optical path structure and pump backup architecture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310098363.2A CN116318409A (en) 2023-02-10 2023-02-10 Optical repeater optical path structure and pump backup architecture

Publications (1)

Publication Number Publication Date
CN116318409A true CN116318409A (en) 2023-06-23

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Family Applications (1)

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CN202310098363.2A Pending CN116318409A (en) 2023-02-10 2023-02-10 Optical repeater optical path structure and pump backup architecture

Country Status (1)

Country Link
CN (1) CN116318409A (en)

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