CN117439696B - Optical path communication structure applied to submarine observation network communication equipment - Google Patents
Optical path communication structure applied to submarine observation network communication equipment Download PDFInfo
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- CN117439696B CN117439696B CN202311743339.6A CN202311743339A CN117439696B CN 117439696 B CN117439696 B CN 117439696B CN 202311743339 A CN202311743339 A CN 202311743339A CN 117439696 B CN117439696 B CN 117439696B
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- 238000004891 communication Methods 0.000 title claims abstract description 96
- 239000013307 optical fiber Substances 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 35
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
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Classifications
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- 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
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
Abstract
The embodiment of the application relates to the technical field of communication, and provides an optical path communication structure applied to submarine observation network communication equipment, which comprises an optical add-drop multiplexer, a first coupler, a communication module and a second coupler; the optical add/drop multiplexer is connected to a trunk or branch of a trunk submarine cable of the submarine optical fiber communication system, two input ends of the first coupler are respectively connected to two output ends of the optical add/drop multiplexer, an input end of the communication module is connected to the first coupler, an output end of the communication module is connected to the second coupler, and two output ends of the second coupler are connected to the optical add/drop multiplexer. By applying the technical scheme of the embodiment of the application, the optical add/drop multiplexer is integrated in the submarine observation network equipment; after the communication module generates the optical signal carrying the service, the second coupler divides the optical signal into two links to be sent to the optical add-drop multiplexer so as to send the submarine observation network equipment to different shore stations, namely, a plurality of shore stations acquire and backup the observation data of the submarine observation network equipment.
Description
Technical Field
The application relates to the technical field of communication, in particular to an optical path communication structure applied to submarine observational network communication equipment.
Background
The main submarine cable of the submarine optical fiber communication system mainly comprises a submarine optical cable and underwater equipment, wherein the submarine cable underwater equipment mainly comprises optical repeater equipment (RPT), water branch unit equipment (BU) and a reconfigurable/fixed optical add/drop multiplexer (R/F) OADM. An optical repeater device (RPT) is an optical signal amplifying unit for amplifying an optical signal transmitted in an optical fiber. The BU is a bridge for realizing the intercommunication of three stations, namely a trunk station and a branch station, and realizes the function of combining/separating part of optical fibers or part of wavelengths of a trunk submarine cable into branches.
The submarine observation network is an earth scientific observation platform, and various observation scientific instruments are installed on the seabed by the submarine observation network to carry out long-term, dynamic and real-time scientific observation on a seawater layer and a ocean bottom layer. As shown in FIG. 1, the existing submarine optical fiber communication system is characterized in that BU2 is a traditional submarine cable trunk branch unit and is used for realizing the communication of ABC three shore base stations; BU1 and BU3 are undersea branching units integrated in the undersea observatory network device for enabling communication between the shore base station and the undersea observatory network device.
However, when the submarine observational network device is directly applied to the submarine optical fiber communication system, for example, as shown in fig. 2, the communication content between the shore a and the shore C is i, the communication content between the shore B and the shore C is ii, where i and ii have the same wavelength but are completely different, and when the shore a transmits the communication content i to the submarine observational network device, if the shore B transmits the communication content ii to the submarine observational network device, the submarine observational network device cannot simultaneously adjust the communication content i and the communication content ii, but in the actual use process, a plurality of shore stations are required to acquire and backup the observation data of the submarine observational network device.
Disclosure of Invention
The embodiment of the application provides an optical path communication structure applied to submarine observation network communication equipment, so that a plurality of shore stations can acquire and backup observation data of the submarine observation network equipment in a submarine observation network.
An optical path communication structure applied to a submarine observation network communication device provided in an embodiment of the present application includes:
the optical add/drop multiplexer is connected to a trunk or branch of a main submarine cable of the submarine optical fiber communication system and used for branching a through signal and a down wave signal of the trunk or branch and/or combining the through signal and the up wave signal of the trunk or branch;
the first coupler is provided with two input ends which are respectively connected with two output ends of the optical add/drop multiplexer so as to receive the downlink signals from two directions of a trunk or a branch;
the input end of the communication module is connected with the first coupler and receives the optical signal output by the first coupler;
the input end of the second coupler is connected with the output end of the communication module and receives the optical signal output by the communication module; the two output ends are connected with the optical add/drop multiplexer to send the uplink signals to the optical add/drop multiplexer in different directions of the trunk or the branch.
In one implementation, the communication module includes a first module and a second module of a dual-link cold-backup setup;
when the first module is abnormal, the second module is switched to work, or when the second module is abnormal, the first module is switched to work.
In one implementation, the optical add/drop multiplexer includes a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer, and a fourth wavelength division multiplexer;
the first wavelength division multiplexer and the second wavelength division multiplexer are arranged on one of two parallel transmission links, and the first wavelength division multiplexer is connected with the input end of the first coupler so as to split a through signal and a downlink signal; the second wavelength division multiplexer is connected with the output end of the second coupler so as to combine the uplink signal and the through signal;
the third wavelength division multiplexer and the fourth wavelength division multiplexer are arranged on the other link of the two parallel transmission links, and the third wavelength division multiplexer is connected with the input end of the first coupler so as to split the through signal and the down signal; the fourth wavelength division multiplexer is connected with the output end of the second coupler so as to combine the uplink signal and the through signal.
In one implementation, the first wavelength division multiplexer, the second wavelength division multiplexer, the third wavelength division multiplexer, and the fourth wavelength division multiplexer are three-port optical add/drop multiplexer branching units.
In one implementation, an optical add/drop multiplexer is configured to: when the trunk or branch where the optical add/drop multiplexer is located has a transmission link fault, the trunk or branch of the main submarine cable of the submarine optical fiber communication system where the transmission link is located is switched from a through state to a loop-back state, so that an optical signal input by the end without the fault of the transmission link is looped back to the end for output.
In one implementation, an optical add/drop multiplexer includes a first optical switch disposed on one of two parallel transmission links and a second optical switch disposed on the other of the two parallel transmission links;
when no transmission link fails, the first optical switch and the second optical switch are in a normal first position, and when the transmission link fails, the first optical switch and the second optical switch are switched to a second position so as to communicate two parallel transmission links.
In one implementation, a fifth wavelength division multiplexer and a sixth wavelength division multiplexer are disposed between the first optical switch and the second optical switch;
after the first optical switch and the second optical switch are switched to the second position, the fifth wavelength division multiplexer or the sixth wavelength division multiplexer positioned on the non-fault side optical path filters COTDR detection light in the service light and/or downlink service light of the submarine observation network device.
In one implementation, the fifth wavelength division multiplexer and the sixth wavelength division multiplexer are two-port bandpass filters.
In one implementation, the first optical switch and the second optical switch are optical devices that include at least two input and output terminals to achieve at least two conductive states.
In one implementation, the first coupler includes two output ports respectively connecting the first module and the second module to couple the down signal to the first module and/or the second module; the second coupler comprises two input ports respectively connected with the first module and the second module so as to receive optical signals output by the first module and/or the second module.
The embodiment of the application provides an optical path communication structure applied to submarine observation network communication equipment, which comprises an optical add/drop multiplexer, a first coupler, a communication module and a second coupler; the optical add/drop multiplexer is connected to a trunk or branch of a trunk submarine cable of the submarine optical fiber communication system, two input ends of the first coupler are respectively connected to two output ends of the optical add/drop multiplexer, an input end of the communication module is connected to the first coupler, an output end of the communication module is connected to the second coupler, and two output ends of the second coupler are connected to the optical add/drop multiplexer.
By applying the technical scheme of the embodiment of the application, the optical add/drop multiplexer is integrated in the submarine observation network equipment, so that the branching of part of wavelengths of a trunk or a branch to the submarine observation network equipment is realized; after the communication module generates the optical signal carrying the service, the second coupler divides the optical signal into two links to be sent to the optical add-drop multiplexer so as to send the submarine observation network equipment to different shore stations, namely, a plurality of shore stations acquire and backup the observation data of the submarine observation network equipment.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a general schematic diagram of a subsea fiber optic communication system;
FIG. 2 is a schematic diagram of a communication link of the submarine optical fiber communication system of FIG. 1;
fig. 3 is a schematic structural diagram of a submarine observation network with an optical path communication structure according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an optical add/drop multiplexer according to an embodiment of the present application;
fig. 5 is a schematic view of a scene in which disaster recovery occurs in a submarine observation network according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of switching an optical add/drop multiplexer to a loopback state according to an embodiment of the present disclosure;
fig. 7 is a schematic wavelength diagram of each link signal in the submarine observation network according to the embodiment of the present application.
Detailed Description
The method comprises the steps that a shore station is responsible for communicating with the submarine observation network equipment, observation data of the submarine observation network equipment are collected and stored, however, in the practical application process, the submarine observation network is required to communicate by using a submarine cable, when the submarine cable breaks down, the problem that the observation data of the submarine observation network equipment are lost very easily, and when the submarine cable breaks down, the problem that the communication with the submarine observation network equipment is lost for a long time is solved seriously, in order to enable the submarine observation network equipment to be arranged in the submarine observation network, and enable a plurality of shore stations to receive the observation data of the submarine observation network equipment, the shore stations are backed up mutually, and the embodiment of the application provides an optical path communication structure applied to the submarine observation network communication equipment.
As shown in fig. 3, an optical path communication structure applied to a submarine observation network communication device provided in the first aspect of the present application includes an optical add/drop multiplexer OADM, a first coupler CPL1, a communication module, and a second coupler CPL2; the optical add/drop multiplexer OADM is connected to a trunk or branch of a main submarine cable of the submarine optical fiber communication system, and is used for branching a through signal and a down wave signal of the trunk or branch, and/or combining the through signal and an up wave signal of the trunk or branch, two input ends of the first coupler CPL1 are respectively connected to two ports of the optical add/drop multiplexer OADM so as to receive the down wave signal branched by the optical add/drop multiplexer OADM, an input end of the communication module is connected to the first coupler CPL1 so as to receive the down wave signal of the first coupler CPL1, and the up wave signal is connected to the optical add/drop multiplexer OADM through two output ends so as to send the up wave signal to different directions of the trunk or branch, thereby realizing single-wave bidirectional dual-channel communication of the submarine observation network device, namely, the submarine observation network device transmits the identical service to the shore station a and the shore station B simultaneously, and realizing the acquisition of the observation data of a plurality of shore stations and the submarine observation network device.
According to the optical path communication structure provided by the embodiment of the application, the optical add/drop multiplexer OADM is integrated in the submarine observation network equipment, so that partial wavelengths of a trunk or a branch are branched to the submarine observation network equipment; after the communication module generates the optical signal carrying the service, the second coupler CPL2 divides the optical signal into two links and transmits the two links to the optical add/drop multiplexer OADM so as to transmit the submarine observation network equipment to different shore stations, namely, a plurality of shore stations acquire and backup the observation data of the submarine observation network equipment.
Because the submarine observation network equipment cannot distinguish the communication content with the same wavelength from different shore stations, in the practical application process, a plurality of shore stations are not communicated with the submarine observation network equipment at the same time, for example, in the practical application process, one shore station is used as a main terminal communicated with the submarine observation network equipment, other shore stations capable of receiving business light of the submarine observation network equipment are used as data backup terminals, when the main terminal cannot communicate with the submarine observation network equipment, the other backup terminals are started to communicate with the backup submarine observation network equipment, so that when the main terminal cannot acquire the observation data due to faults, the observation data of the submarine observation network equipment can still be acquired and backed up, and the communication with the submarine observation network equipment is kept.
In order to improve reliability of the submarine observatory network device, as shown in fig. 3, in some embodiments of the present application, the communication module includes a first module and a second module that are configured with a dual-link cold backup; the first module and the second module have the same structure and function, and work by the first module under normal conditions, and when the first module is abnormal, the second module can be switched to work by a command, so that service transmission is quickly recovered; or under normal conditions, the second module works, when the second module is abnormal, the first module can be switched to work through a command, so that service transmission is quickly recovered, and in order to realize dual-link cold backup of the first module and the second module, the first coupler comprises two output ports respectively connected with the first module and the second module so as to couple a downlink signal to the first module and/or the second module; correspondingly, the second coupler comprises two input ports respectively connected with the first module and the second module so as to receive the optical signals output by the first module and/or the second module.
In order to achieve splitting of the through signal and the down signal of the trunk or branch and combining of the through signal and the up signal of the trunk or branch, as shown in fig. 4, in some embodiments of the present application, the optical add/drop multiplexer includes a first wavelength division multiplexer WDM1, a second wavelength division multiplexer WDM2, a third wavelength division multiplexer WDM3, and a fourth wavelength division multiplexer WDM4, and the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, the third wavelength division multiplexer WDM3, and the fourth wavelength division multiplexer WDM4 are three-port optical add/drop multiplexer branching units.
The first wavelength division multiplexer WDM1 and the second wavelength division multiplexer WDM2 are arranged on one of two parallel transmission links, one port of the first wavelength division multiplexer WDM1 is connected with the input end of the first coupler CPL1 so as to split a through signal and a downlink signal, and the split downlink signal is transmitted to the first coupler CPL 1; one port of the second wavelength division multiplexer WDM2 is connected to the output end of the second coupler CPL2, so as to receive the uplink signal sent by the second coupler CPL2, and combine the uplink signal and the through signal.
The third wavelength division multiplexer WDM3 and the fourth wavelength division multiplexer WDM4 are arranged on the other link of the two parallel transmission links, one port of the third wavelength division multiplexer WDM3 is connected with the input end of the first coupler CPL1 to split the through signal and the down signal, and the split down signal is sent to the first coupler CPL 1; the fourth wavelength division multiplexer WDM4 is connected to the output end of the second coupler CPL2, so as to receive the uplink signal sent by the second coupler CPL2, and combine the uplink signal and the through signal.
To more clearly illustrate the principle of the optical path communication structure provided in the embodiment of the present application, taking fig. 4 as an example, an optical signal (without considering signal processing procedures such as optical signal and/or branching and filtering) sent by the shore station a to the submarine observation network device passes through the first wavelength division multiplexer WDM1, the first coupler CPL1, the first module or the second module and the second coupler CPL2 in sequence, and then the second coupler CPL2 outputs two paths of signals to the fourth wavelength division multiplexer WDM4 and the second wavelength division multiplexer WDM2, so as to send the same service light to the shore station a and the shore station B.
As shown in fig. 5, in order to construct a submarine observation network using a submarine observation network device with an optical path communication structure, a shore a, a shore B, and a submarine observation network device with an optical path communication structure are included in the submarine observation network. Optical repeater devices RPT are respectively arranged among the shore station A, the shore station B and the submarine observation network device. When a cable break or a submarine cable leakage fault occurs between the shore station A and the submarine observation network equipment, the business light on the shore station A side cannot reach the submarine observation network equipment, and the survival business from the submarine observation network equipment to the shore station B only has the wave-up business of the submarine observation network equipment. In order to solve the problem that the total output power is constant when the submarine cable optical repeater works under the condition of deep saturation, and the service signals from the submarine observatory network device to the shore station B are amplified to be larger times due to the loss of the through service signals from the shore station A to the shore station B, the single wave optical power of the signal is increased, and the system performance is possibly degraded due to high nonlinear transmission cost, and normal communication between the submarine observatory network device and the shore station B is affected, in some embodiments of the present application, the optical add/drop multiplexer OADM is configured to: when the trunk or branch where the optical add drop multiplexer OADM is located has a transmission link fault, the trunk or branch where the transmission link is located is switched from a pass-through state to a loop-back state, so that an optical signal input at the end where the transmission link has no fault is looped back to the end for output.
Specifically, the above-described function may be implemented by using a plurality of optical paths (the through state is switched to the loop-back state), for example, as shown in fig. 4 and 6, the optical add/drop multiplexer OADM includes a first optical switch SW1 provided on one of two parallel transmission links, and a second optical switch SW2 provided on the other of the two parallel transmission links; wherein the first optical switch SW1 and the second optical switch SW2 are optical devices having one or more selectable transmission ports, which function to perform physical switching or logical operation on optical signals in an optical transmission line or an integrated optical circuit, and at least two input/output ports.
In the embodiment of the application, the first optical switch and the second optical switch are optical devices including two input and output ends, so as to realize at least two conducting states, as shown in fig. 4, wherein the first state is that a port (4) is communicated with a port (3); as shown in fig. 6, the second state is that the port (1) is communicated to the port (3) and the port (4) is communicated to the port (2), so that when there is no transmission link failure, as shown in fig. 4, the first optical switch SW1 and the second optical switch SW2 are in a normal first position (first state), and when a transmission link failure occurs, as shown in fig. 6, the first optical switch SW1 and the second optical switch SW2 are switched to a second position (second state) to communicate two transmission links in parallel.
Wherein, as shown in fig. 6, a fifth wavelength division multiplexer and a sixth wavelength division multiplexer are arranged between the first optical switch SW1 and the second optical switch SW2; the fifth wavelength division multiplexer and the sixth wavelength division multiplexer are two-port band-pass filters, and can completely filter or partially filter optical signals in a specific wavelength range in the input wavelength division multiplexing optical signals, and the other optical signals completely pass through, so that after the first optical switch SW1 and the second optical switch SW2 are switched to the second position, the fifth wavelength division multiplexer or the sixth wavelength division multiplexer in the non-fault side optical path filters COTDR detection light (coherent optical time domain reflection, coherent optical time domain reflectometer) in service light and/or downlink service light of the submarine observation network device.
To more clearly illustrate the above principle, consider fig. 7 as an example:
the whole system transmits lambda 1 -λ 40 A wave.
λ 41 For COTDR probe wavelength.
The upper and lower wavelength of the first submarine observation network equipment is lambda 1 。
The upper and lower wavelength of the second submarine observation network equipment is lambda 2 。
BU2 has an upper and lower wavelength of lambda 3 。
For the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, the third wavelength division multiplexer WDM3 and the fourth wavelength division multiplexer WDM4 within the first subsea observation network device, the wavelength X of the penetrating signal at the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, the third wavelength division multiplexer WDM3 and the fourth wavelength division multiplexer WDM4 refers to the wavelength λ 2 -λ 41 The wavelength Y of the down signal is lambda 1 。
For the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, the third wavelength division multiplexer WDM3 and the fourth wavelength division multiplexer WDM4 in the second subsea observation network device, the wavelength X of the penetrating signal of the first wavelength division multiplexer WDM1, the second wavelength division multiplexer WDM2, the third wavelength division multiplexer WDM3 and the fourth wavelength division multiplexer WDM4 refers to the wavelength λ 1 +λ 3 -λ 41 The wavelength Y of the down signal is lambda 2 。
For the fifth wavelength division multiplexer WDM5 and the sixth wavelength division multiplexer WDM6 of the undersea observation network arrangement of this fibre pair, the wavelength X' of the penetration signal at the fifth wavelength division multiplexer WDM5 and the sixth wavelength division multiplexer WDM6 refers to λ 3 -λ 40 Wavelength Y' of the downlink traffic light refers to lambda 1 -λ 2 +λ 41 (i.e. the fifth wavelength division multiplexer WDM5 and the sixth wavelength division multiplexer WDM6 function to filter all undersea observatory network device down-wave wavelengths and COTDR detection wavelengths).
In this way, in the disaster-tolerant scene of the main road or the side of the shore station A, the optical signal sent by the shore station B is filtered out by the fifth wavelength division multiplexer WDM5, and then is used as a dummy light (no-signal fake light) to be looped back to the shore station B after the COTDR detection light and the downlink service frequency of the second submarine observation network equipment are filtered out, so that the lost service power of the non-fault side main road due to faults is compensated, and the normal communication of the non-fault side is ensured.
The embodiment of the application provides an optical path communication structure applied to submarine observation network communication equipment, which comprises an optical add/drop multiplexer OADM, a first coupler CPL1, a communication module and a second coupler CPL2; the optical add/drop multiplexer OADM is connected to a trunk or branch of a main submarine cable of the submarine optical fiber communication system, two input ends of the first coupler CPL1 are respectively connected to two output ends of the optical add/drop multiplexer OADM, an input end of the communication module is connected to the first coupler CPL1, an output end of the communication module is connected to the second coupler CPL2, and two output ends of the second coupler are connected to the optical add/drop multiplexer.
By applying the technical scheme of the embodiment of the application, the optical add/drop multiplexer is integrated in the submarine observation network equipment, so that the branching of part of wavelengths of a trunk or a branch to the submarine observation network equipment is realized; the second coupler CPL2 divides the optical signal into two links to be sent to the optical add/drop multiplexer so as to send the submarine observation network equipment to different shore stations, namely, a plurality of shore stations acquire and backup the observation data of the submarine observation network equipment.
The foregoing detailed description of the embodiments has further described the objects, technical solutions and advantageous effects of the present application, and it should be understood that the foregoing is only a detailed description of the present application and is not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the scope of protection of the present application.
Claims (9)
1. An optical path communication structure applied to submarine observation network communication equipment, comprising:
the optical add/drop multiplexer is connected to a trunk or branch of a main submarine cable of the submarine optical fiber communication system and used for branching a through signal and a down wave signal of the trunk or branch and/or combining the through signal and the up wave signal of the trunk or branch;
the first coupler is provided with two input ends which are respectively connected with two output ends of the optical add/drop multiplexer so as to receive the downlink signals from two directions of a trunk or a branch;
the input end of the communication module is connected with the first coupler and receives the optical signal output by the first coupler;
the input end of the second coupler is connected with the output end of the communication module so as to receive the optical signal output by the communication module; the two output ends are connected with the optical add/drop multiplexer so as to send uplink signals to the optical add/drop multiplexer in different directions of a trunk or a branch;
the optical add/drop multiplexer comprises a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer and a fourth wavelength division multiplexer;
the first wavelength division multiplexer and the second wavelength division multiplexer are arranged on one of two parallel transmission links, and the first wavelength division multiplexer is connected with the input end of the first coupler so as to split a through signal and a downlink signal; the second wavelength division multiplexer is connected with the output end of the second coupler so as to combine the uplink signal and the through signal;
the third wavelength division multiplexer and the fourth wavelength division multiplexer are arranged on the other link of the two parallel transmission links, and the third wavelength division multiplexer is connected with the input end of the first coupler so as to split the through signal and the down signal; the fourth wavelength division multiplexer is connected with the output end of the second coupler so as to combine the uplink signal and the through signal.
2. The optical path communication structure applied to the submarine observation network communication equipment according to claim 1, wherein the communication module comprises a first module and a second module of a dual-link cold backup set;
when the first module is abnormal, the second module is switched to work, or when the second module is abnormal, the first module is switched to work.
3. The optical path communication structure applied to the submarine observation network communication equipment according to claim 1, wherein the first wavelength division multiplexer, the second wavelength division multiplexer, the third wavelength division multiplexer and the fourth wavelength division multiplexer are three-port optical add/drop multiplexer branching units.
4. An optical path communication structure applied to a submarine observation network communication apparatus according to claim 1, wherein the optical add/drop multiplexer is configured to:
when the trunk or branch where the optical add/drop multiplexer is located has a transmission link fault, the trunk or branch of the main submarine cable of the submarine optical fiber communication system where the transmission link is located is switched from a through state to a loop-back state, so that an optical signal input by the end without the fault of the transmission link is looped back to the end for output.
5. The optical path communication structure applied to the communication equipment of the submarine observation network according to claim 4, wherein the optical add/drop multiplexer comprises a first optical switch arranged on one of two parallel transmission links and a second optical switch arranged on the other of the two parallel transmission links;
when no transmission link fails, the first optical switch and the second optical switch are in a normal first position, and when the transmission link fails, the first optical switch and the second optical switch are switched to a second position so as to communicate two parallel transmission links.
6. The optical path communication structure applied to the communication equipment of the submarine observation network according to claim 5, wherein a fifth wavelength division multiplexer and a sixth wavelength division multiplexer are arranged between the first optical switch and the second optical switch;
after the first optical switch and the second optical switch are switched to the second position, the fifth wavelength division multiplexer or the sixth wavelength division multiplexer positioned on the non-fault side optical path filters COTDR detection light in the service light and/or downlink service light of the submarine observation network device.
7. The optical communication structure for use in a communication device of a submarine observational network of claim 6, wherein the fifth wavelength division multiplexer and the sixth wavelength division multiplexer are two-port bandpass filters.
8. An optical communication structure for use in a submarine observatory network communication device according to claim 5 or 6, wherein the first optical switch and the second optical switch are optical devices comprising at least two input and output terminals, so as to achieve at least two conducting states.
9. An optical path communication structure applied to a submarine observation network communication device according to claim 2, wherein the first coupler comprises two output ports respectively connected with the first module and the second module to couple the down wave signal to the first module and/or the second module;
the second coupler comprises two input ports respectively connected with the first module and the second module so as to receive optical signals output by the first module and/or the second module.
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