CN114584207B - Reconfigurable optical add-drop multiplexer - Google Patents
Reconfigurable optical add-drop multiplexer Download PDFInfo
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- CN114584207B CN114584207B CN202210478461.4A CN202210478461A CN114584207B CN 114584207 B CN114584207 B CN 114584207B CN 202210478461 A CN202210478461 A CN 202210478461A CN 114584207 B CN114584207 B CN 114584207B
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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
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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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
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
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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
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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Abstract
The application relates to the technical field of submarine communication, and provides a reconfigurable optical add-drop multiplexer, a reconfigurable optical add-drop multiplexer internally configured has main light path and backup state light path, the main light path includes: the system comprises a first trunk line and a second trunk line which are arranged between an end station A and an end station B, wherein a first branch input line and a first branch output line are arranged between the first trunk line and the end station C, and a second branch input line and a second branch output line are arranged between the second trunk line and the end station C; the backup state lightpath comprises: a third trunk line and a fourth trunk line provided between the end station a and the end station B. The method and the device are suitable for the technical field of communication, and solve the problems that in the prior art, when a main wavelength selection switch of the reconfigurable optical add-drop multiplexer is failed, a backup wavelength selection switch is set to be more complicated and switching is limited, and after backup, an original service signal transmission path is changed to influence normal reception, so that service performance is reduced, and the safety of information transmission is lower.
Description
Technical Field
The application relates to the technical field of submarine communication, in particular to a reconfigurable optical add-drop multiplexer.
Background
As shown in fig. 1, a dashed box in fig. 1 represents a Reconfigurable Optical Add/Drop Multiplexer enclosure, and in the prior art, two branch fibers are used to implement a ROADM (Reconfigurable Optical Add/Drop Multiplexer) node scheme that simultaneously supports bidirectional communication between an end station a and an end station B, where the end station a and the end station B are trunk end stations, and the end station C is a branch end station, and a CPL (Coupler). The scheme divides the service bandwidth into three sub-bands for carrying the communication services of the end station a and the end station B (the communication signal sent by the end station a to the end station B and the communication signal sent by the end station B to the end station a), the communication services of the end station a and the end station C (the communication signal sent by the end station a to the end station C and the communication signal sent by the end station C to the end station a), and the communication services of the end station B and the end station C (the communication signal sent by the end station C to the end station B and the communication signal sent by the end station B to the end station C).
As shown in fig. 2, when WSS1 device (Wavelength Selective Switch) of the reconfigurable optical add-drop multiplexer in fig. 1 fails, SW1/2/3 (Switch optical Switch device) switches states in the same optical path, specifically, after optical signals from end station a (communication signal sent by end station a to end station B and communication signal sent by end station a to end station C) enter the ROADM node, because WSS1 fails, communication signal sent by end station a to end station B and communication signal sent by end station a to end station C are directly transmitted to end station C by down-wave, communication signal sent by end station a to end station B and communication signal sent by end station a to end station C are down-wave transmitted to end station C after passing through WSS3, communication signal sent by end station a to end station B and communication signal sent by end station C to end station B are combined via SW3, and then are further up-wave transmitted to reconfigurable optical add-drop multiplexer, and SW2 of optical add-drop multiplexer send communication signals sent by end station a to end station B and end station C And transmitting the signal to the end station B to realize the function of backup failure of the WSS device of the reconfigurable optical add-drop multiplexer. The switching backup principle when the WSS2 fails is the same as that when the WSS1 fails, and the description is omitted here.
It can be seen from the above that in the prior art, redundant backup of a reconfigurable optical add-drop multiplexer WSS requires matching of branch end stations, and backup state switching can only be performed through the branch end stations, which results in that the backup function of the reconfigurable optical add-drop multiplexer is not flexible and convenient enough, and when the backup state is switched, communication services between original trunk end stations go to the branch end stations and are looped back from the WSS of the branch end stations and then transmitted to the trunk end stations, which results in the problem of information safety.
Disclosure of Invention
The application provides a reconfigurable optical add-drop multiplexer, which solves the problems that when a main wavelength selection switch of the reconfigurable optical add-drop multiplexer in the prior art is invalid, the switching to a backup wavelength selection switch is complicated and limited, and after backup, the transmission path of an original service signal is lengthened to influence normal reception, so that the service performance is reduced, and the safety of information transmission is low.
A reconfigurable optical add/drop multiplexer having a master optical path and a backup optical path disposed therein, the master optical path comprising: the first trunk line and the second trunk line are arranged between the end station A and the end station B, a first branch input line and a first branch output line are arranged between the first trunk line and the end station C, and a second branch input line and a second branch output line are arranged between the second trunk line and the end station C;
the backup state lightpath comprises: a third trunk line and a fourth trunk line provided between the end station a and the end station B, the third trunk line and the first trunk line sharing a pair of the changeover switch S1 and the changeover switch S2 at both ends thereof so that the end station B transmits a communication signal to the end station a through the first trunk line or so that the end station B transmits a communication signal to the end station a through the third trunk line, the fourth trunk line and the second trunk line sharing a pair of the changeover switch S3 and the changeover switch S4 at both ends thereof so that the end station a transmits a communication signal to the end station B through the second trunk line or so that the end station a transmits a communication signal to the end station B through the fourth trunk line;
a third branch input line and a third branch output line are arranged between the third trunk line and the end station C, and the input ends of the third branch input line and the first branch input line share one switch S5, so that the end station C transmits a communication signal to the end station A through the first branch input line, or the end station C transmits a communication signal to the end station A through the third branch input line; the output ends of the third branch output line and the first branch output line share one switch S6, so that the end station B transmits a communication signal to the end station C through the first branch output line, or the end station B transmits a communication signal to the end station C through the third branch output line;
a fourth branch input line and a fourth branch output line are arranged between the fourth trunk line and the end station C, and the input ends of the second branch input line and the fourth branch input line share one switch S7, so that the end station C transmits a communication signal to the end station B through the second branch input line, or the end station C transmits a communication signal to the end station B through the fourth branch input line; the outputs of the second branch input line and the fourth branch output line share a switch S8 to allow end station a to transmit communication signals to end station C via the second branch output line or allow end station a to transmit communication signals to end station C via the fourth branch output line.
In one implementation, the first trunk line includes a first splitter and a first wavelength selective switch connected in sequence, an input of the first splitter being connected to an output of the end station B through a switch S1, an output of the first wavelength selective switch being connected to an input of the end station a through a switch S2; the third trunk line comprises a fifth splitter and a fifth wavelength selective switch which are connected in sequence, wherein the input end of the fifth splitter is connected with the output end of the terminal station B through a selector switch S1, and the output end of the fifth wavelength selective switch is connected with the input end of the terminal station A through a selector switch S2.
In one implementation, the second trunk line includes a second splitter and a second wavelength selective switch connected in sequence, an input end of the second splitter is connected to an output end of the end station a through a switch S3, and an output end of the second wavelength selective switch is connected to an input end of the end station B through a switch S4; the fourth trunk line comprises a sixth splitter and a sixth wavelength selective switch which are connected in sequence, the input end of the sixth splitter is connected with the output end of the terminal station A through a change-over switch S3, and the output end of the sixth wavelength selective switch is connected with the input end of the terminal station B through a change-over switch S4.
In one implementation, the first branch input line comprises a third splitter, the input of which is connected to the switch S5, and the output of which is connected to the first wavelength selective switch; the third branch input line comprises a seventh splitter, an input end of the seventh splitter is connected with a switch S5, and an output end of the seventh splitter is connected with a fifth wavelength selective switch;
the first branch output line comprises a third wavelength selective switch, the input end of the third wavelength selective switch is connected with the first splitter, and the output end of the third wavelength selective switch is connected with the input end of the terminal station C through a selector switch S6; the third branch output line comprises a seventh wavelength selective switch, the input end of the seventh wavelength selective switch is connected with the fifth branch, and the output end of the seventh wavelength selective switch is connected with the input end of the terminal station C through a selector switch S6.
In one implementation, the second branch input line comprises a fourth splitter, the input of which is connected to the switch S7, and the output of which is connected to the input of the second wavelength selective switch; the fourth branch input line comprises an eighth splitter, an input of the eighth splitter being connected to the switch S7, an output of the eighth splitter being connected to an input of a sixth wavelength selective switch;
the second branch output line comprises a fourth wavelength selective switch, the input end of the fourth wavelength selective switch is connected with the second branch device, and the output end of the fourth wavelength selective switch is connected with the input end of the terminal station C through a selector switch S8; the fourth branch output line comprises an eighth wavelength selective switch, the input end of the eighth wavelength selective switch is connected with the sixth splitter, and the output end of the eighth wavelength selective switch is connected with the input end of the terminal station C through a selector switch S8.
According to the reconfigurable optical add-drop multiplexer, the main optical path and the backup optical path which are completely the same are arranged in the reconfigurable optical add-drop multiplexer, so that when a communication service signal output by an end station is input into the reconfigurable optical add-drop multiplexer provided by the application, if the main optical path fails, the communication signal can be transmitted by switching to the backup optical path, the backup function is realized only by an optical device in the reconfigurable optical add-drop multiplexer, an original optical signal path is not changed before and after optical path state switching, the information safety risk is avoided, and the equipment reliability is also improved.
According to the reconfigurable optical add-drop multiplexer, optical path devices through which communication signals pass before and after switching of a main optical path and a backup state optical path are completely consistent, optical performance before and after switching of the optical path states is consistent, and transmission performance of a system is prevented from being cracked; by utilizing the synchronous selection and switching of a plurality of optical switches, the power distribution of the branching unit and the wavelength selection function of the wavelength selection switch device, the backup of the internal key units of the reconfigurable optical add-drop multiplexer is realized, the network management backup functions of the end station A, the end station B and the end station C can be flexible, the backup of a certain end station or equipment only through a certain end station is not needed, and the convenience of equipment backup setting is greatly improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a ROADM node scheme in the prior art, in which two branch fiber pairs simultaneously support two trunk end stations and one branch end station to perform bidirectional communication.
Fig. 2 is a schematic diagram of a ROADM node scheme in the event of a failure of the WSS1 device of fig. 1.
Fig. 3 is a schematic diagram of a main light path arrangement scheme provided in this embodiment.
Fig. 4 is a schematic diagram of a backup state optical path setting scheme provided in this embodiment.
Fig. 5 is a schematic optical path diagram when the main optical path provided in this embodiment transmits an optical signal.
Fig. 6 is a schematic optical path diagram when the optical path in the backup state provided in this embodiment transmits an optical signal.
Detailed Description
In the embodiment of the present application, a reconfigurable optical add/drop multiplexer is provided, where a main optical path and a backup optical path are configured inside the reconfigurable optical add/drop multiplexer, as shown in fig. 3 and 5, a dashed-line frame in fig. 3 and 5 represents a reconfigurable optical add/drop multiplexer casing, the main optical path includes: a first trunk line is provided between end station a and end station B. Specifically, the first trunk line includes a first splitter a1 and a first wavelength selective switch B1, which are connected in sequence, an input end of the first splitter a1 is connected to an output end of the terminal station B through a switch S1, and an output end of the first wavelength selective switch B1 is connected to an input end of the terminal station a through a switch S2.
A second trunk line disposed between end station a and end station B. Specifically, the second trunk line includes a second splitter a2 and a second wavelength selective switch B2, which are connected in sequence, an input end of the second splitter a2 is connected to an output end of the terminal station a through a change-over switch S3, and an output end of the second wavelength selective switch B2 is connected to an input end of the terminal station B through a change-over switch S4.
A first trunk line provided between the first trunk line and an end station C. Specifically, the first branch input line includes a third splitter A3, an input end of the third splitter A3 is connected to the switch S5, and an output end of the third splitter A3 is connected to an input end of the first wavelength selective switch B1.
And a first branch output line is arranged between the first trunk line and the end station C. Specifically, the first branch output line includes a third wavelength selective switch B3, an input end of the third wavelength selective switch B3 is connected to the first splitter a1, and an output end of the third wavelength selective switch B3 is connected to an input end of the terminal station C through a changeover switch S6.
A second branch input line provided between the second trunk line and an end station C. Specifically, the second branch input line comprises a fourth splitter a4, an input end of the fourth splitter a4 is connected with the switch S7, and an output end of the fourth splitter a4 is connected with an input end of the second wavelength selection switch B2.
And a second branch output line is arranged between the second trunk line and the end station C. Specifically, the second branch output line includes a fourth wavelength selective switch B4, an input end of the fourth wavelength selective switch B4 is connected to the second splitter a2, and an output end of the fourth wavelength selective switch B4 is connected to an input end of the terminal station C through a change-over switch S8.
As shown in fig. 4 and 6, the dashed boxes in fig. 4 and 6 represent reconfigurable optical add/drop multiplexer housings, and the backup-state optical path includes: and a third trunk line provided between the end station a and the end station B, the third trunk line and the first trunk line sharing a pair of a switch S1 and a switch S2 at both ends thereof, so that the end station B transmits the communication signal to the end station a through the first trunk line, or the end station B transmits the communication signal to the end station a through the third trunk line. Specifically, the third trunk line includes a fifth splitter a5 and a fifth wavelength selective switch B5, which are connected in sequence, an input end of the fifth splitter a5 is connected to an output end of the terminal B through a switch S1, and an output end of the fifth wavelength selective switch B5 is connected to an input end of the terminal a through a switch S2.
And a fourth trunk line provided between the end station a and the end station B, the fourth trunk line and the second trunk line sharing a pair of the switch S3 and the switch S4 at both ends thereof, so that the end station a transmits the communication signal to the end station B through the second trunk line, or the end station a transmits the communication signal to the end station B through the fourth trunk line. Specifically, the fourth trunk line includes a sixth splitter a6 and a sixth wavelength selective switch B6, which are connected in sequence, an input end of the sixth splitter a6 is connected to an output end of the terminal station a through a switch S3, and an output end of the sixth wavelength selective switch B6 is connected to an input end of the terminal station B through a switch S4.
And a third branch input line disposed between the third trunk line and the end station C, wherein the input ends of the third branch input line and the first branch input line share a switch S5, so that the end station C transmits the communication signal to the end station a through the first branch input line, or the end station C transmits the communication signal to the end station a through the third branch input line. Specifically, the third branch input line includes a seventh splitter a7, an input of the seventh splitter a7 is connected to the switch S5, and an output of the seventh splitter a7 is connected to an input of a fifth wavelength selective switch B5.
And a third branch output line is arranged between the third trunk line and the end station C, and the output ends of the third branch output line and the first branch output line share one switch S6, so that the end station B transmits a communication signal to the end station C through the first branch output line, or the end station B transmits a communication signal to the end station C through the third branch output line. Specifically, the third branch output line includes a seventh wavelength selective switch B7, an input end of the seventh wavelength selective switch B7 is connected to the fifth splitter a5, and an output end of the seventh wavelength selective switch B7 is connected to an input end of the end station C through a switch S6.
And a fourth branch input line disposed between the fourth trunk line and the end station C, wherein input ends of the fourth branch input line and the second branch input line share one switch S7, so that the end station C transmits a communication signal to the end station B through the second branch input line, or the end station C transmits a communication signal to the end station B through the fourth branch input line. Specifically, the fourth branch input line includes an eighth splitter A8, an input of the eighth splitter A8 is connected to the switch S7, and an output of the eighth splitter A8 is connected to an input of the sixth wavelength selective switch B6.
And a fourth branch output line is arranged between the fourth trunk line and the end station C, and output ends of the fourth branch output line and the second branch output line share one switch S8, so that the end station a transmits a communication signal to the end station C through the second branch output line, or the end station a transmits a communication signal to the end station C through the fourth branch output line. Specifically, the fourth branch output line includes an eighth wavelength selective switch B8, an input end of the eighth wavelength selective switch B8 is connected to the sixth splitter a6, and an output end of the eighth wavelength selective switch B8 is connected to an input end of the terminal station C through a switch S8.
In this application, end station a, end station B are trunk end stations, and end station C is a branch end station. The first splitter a1, the second splitter a2, the third splitter A3, the fourth splitter a4, the fifth splitter a5, the sixth splitter a6, the seventh splitter a7 and the eighth splitter A8 are respectively provided with an input interface and two output interfaces, and split an input communication signal into two communication signals with equal power. The change-over switch S1, the change-over switch S2, the change-over switch S3, the change-over switch S4, the change-over switch S5, the change-over switch S6, the change-over switch S7 and the change-over switch S8 are a two-switch with a set state and a reset state.
It should be noted that after passing through the reconfigurable optical add/drop multiplexer, the optical signal also needs to be transmitted to the optical fiber amplifier for amplifying the optical signal, and the optical fiber amplifier has a certain requirement on the bandwidth required for normal operation. For example, the bandwidth required for normal operation of the optical fiber amplifier is 10-wave signals, 10-wave signals are sent from the end station a, and are transmitted to the end station C2-wave signals and transmitted to the end station B8-wave signals after passing through the reconfigurable optical add-drop multiplexer, 10 waves are combined after 2-wave signals of the end station C and 8-wave optical signals transmitted by the end station a, and are continuously transmitted to the end station B, while for equipment of the end station C, only 2 waves of the end station a exist, and the bandwidth required for normal operation of the subsequent optical fiber amplifier cannot be met, so that 8-wave signals, i.e., DL signals, need to be sent through the end station C, and the 8 waves and 2-wave combined waves of the end station a continue to be transmitted to the end station C. In this application, the DL (dummy light) signal is an optical signal without modulation signal and carrying no traffic, and the DL signal is provided only by the end station C in the normal operation mode of the ROADM.
In an exemplary embodiment, one output interface of the third splitter A3 is connected to an input terminal of the first wavelength selective switch B1, and the other output interface is connected to an input terminal of the third wavelength selective switch B3, so as to transmit a DL signal, which is sent by the end station C and used for balancing the power of an optical signal sent by the end station C to the end station a, back to the end station C, and the other output interface of the fourth splitter a4 is connected to an input terminal of the fourth wavelength selective switch B4, so as to transmit a DL signal, which is sent by the end station C and used for balancing the power of an optical signal sent by the end station C to the end station B, back to the end station C.
In an exemplary embodiment, one output interface of the seventh splitter a7 is connected to an input terminal of the fifth wavelength selective switch B5, and the other output interface is connected to an input terminal of the seventh wavelength selective switch B7, so as to transmit the DL signal, which is sent by the end station C and used for balancing the power of the optical signal sent by the end station C to the end station a, back to the end station C, and the other output interface of the eighth splitter A8 is connected to an input terminal of the eighth wavelength selective switch B8, so as to transmit the DL signal, which is sent by the end station C and used for balancing the power of the optical signal sent by the end station C to the end station B, back to the end station C.
In one illustrative embodiment, the reconfigurable optical add/drop multiplexer comprises an end station a input interface, an end station B input interface, an end station a output interface, an end station B output interface, two input interfaces of an end station C, and two output interfaces of an end station C. Through the arranged input interface of the end station A, the input interface of the end station B, the output interface of the end station A, the output interface of the end station B, the two input interfaces of the end station C and the two output interfaces of the end station C, the reconfigurable optical add-drop multiplexer can be convenient for installation personnel to carry out wiring installation when in use.
In an exemplary embodiment, when a signal transmission abnormality and failure occur in the main optical path or the backup optical path, the switching of the backup optical path or the main optical path is completed by switching the states of the switch S1, the switch S2, the switch S3, the switch S4, the switch S5, the switch S6, the switch S7 and the switch S8.
The change-over switch S1, the change-over switch S2, the change-over switch S3, the change-over switch S4, the change-over switch S5, the change-over switch S6, the change-over switch S7 and the change-over switch S8 synchronously complete the switching of the switch states, so that the communication signals are transmitted through the backup state optical path or the main optical path.
In an exemplary embodiment, the switch states of the switch S1, the switch S3, the switch S5 and the switch S6 are synchronously switched, and the switch states of the switch S2, the switch S4, the switch S7 and the switch S8 are synchronously switched according to the switched states of the switch S1, the switch S3, the switch S5 and the switch S6, so as to realize smooth switching of the main optical path or the backup optical path and normal transmission of the communication signal. For example, when the switch states of the switch S1, the switch S3, the switch S5 and the switch S6 are synchronously in the reset state, the switch states of the switch S2, the switch S4, the switch S7 and the switch S8 are synchronously switched to the reset state, and the communication signal is transmitted through the main optical path; when the switch states of the change-over switch S1, the change-over switch S3, the change-over switch S5 and the change-over switch S6 are synchronously in the setting state, the switch states of the change-over switch S2, the change-over switch S4, the change-over switch S7 and the change-over switch S8 are synchronously switched to the setting state, and the communication signals are transmitted through the backup state optical path.
In the present application, when a communication signal is transmitted through the main optical path, the backup optical path is not enabled; when the communication signal is transmitted through the backup-state optical path, the main optical path is not activated. So as to reduce the loss of the signal transmission process and the overall power consumption of the reconfigurable optical add-drop multiplexer.
For example, after the communication signal sent by the end station B is selectively transmitted to the main optical path inside the reconfigurable optical add/drop multiplexer through the switch S1, the first splitter a1 splits the communication signal sent by the end station B into two communication signals with equal power, where one communication signal is: the communication signal is sent to a first wavelength selection switch B1 for screening and is output to the end station A after a switch S2 is switched; the other path of communication signal is as follows: the communication signal is sent to the third wavelength selective switch B3 for screening and switching the switch S6, and then is output to the end station C.
After the communication signal sent by the end station a is selectively transmitted to the main optical path inside the reconfigurable optical add-drop multiplexer through the switch S3, the communication signal sent by the end station a is divided into two paths of communication signals with equal power through the second splitter a2, one path of communication signal is filtered through the second wavelength selective switch B2 and output to the end station B through the switch S4, and the other path of communication signal is filtered through the fourth wavelength selective switch B4 and output to the end station C through the switch S8.
After a communication signal sent by the end station C to the end station a is selectively transmitted to a main optical path inside the reconfigurable optical add-drop multiplexer through the switch S5, the communication signal sent by the end station C is divided into two paths of communication signals with equal power through the third splitter A3, one path of communication signal is filtered through the first wavelength selective switch B1 and output to the end station a after the switch S2, and the other path of communication signal is filtered through the third wavelength selective switch B3 and returned to the end station C after the switch S6 (a DL signal is returned).
After a communication signal sent by the end station C to the end station B is selectively transmitted to the main optical path inside the reconfigurable optical add-drop multiplexer through the switch S7, the communication signal sent by the end station C is divided into two paths of communication signals with equal power through the fourth splitter a4, one path of communication signal is filtered through the second wavelength selective switch B2 and output to the end station B after the switch S4, and the other path of communication signal is filtered through the fourth wavelength selective switch B4 and returned to the end station C after the switch S8 (DL signal is returned).
In practical application, by the selective switching of the change-over switch S1, the change-over switch S2, the change-over switch S3, the change-over switch S4, the change-over switch S5, the change-over switch S6, the change-over switch S7 and the change-over switch S8, the power distribution is realized by the first splitter a1, the second splitter a2, the third splitter A3, the fourth splitter a4, the fifth splitter a5, the sixth splitter A6, the seventh splitter a7 and the eighth splitter A8, and the wavelength selection is realized by the first wavelength selection switch B1, the second wavelength selection switch B2, the third wavelength selection switch B3, the fourth wavelength selection switch B4, the fifth wavelength selection switch B5, the sixth wavelength selection switch B6, the seventh wavelength selection switch B7 and the eighth wavelength selection switch B8, thereby realizing the backup of the reconfigurable optical add-drop multiplexer internal unit and realizing the backup function of the key end station a, the end station B and the backup station C, and the device can be set without setting a certain end station or only through the equipment of a certain end station, so that the convenience of equipment backup setting is greatly improved. In the whole switching process, the original optical signal path is not changed before and after the switching of the main optical path and the backup optical path only by changing the switching states of the switch S1, the switch S2, the switch S3, the switch S4, the switch S5, the switch S6, the switch S7 and the switch S8, so that the information safety risk is avoided, and the equipment reliability is improved.
The above embodiments are provided to explain the purpose, technical solutions and advantages of the present application in further detail, and it should be understood that the above embodiments are merely illustrative of the present application and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.
Claims (10)
1. A reconfigurable optical add/drop multiplexer, wherein a main optical path and a backup optical path are configured inside the reconfigurable optical add/drop multiplexer, and the main optical path comprises: the first trunk line and the second trunk line are arranged between the end station A and the end station B, a first branch input line and a first branch output line are arranged between the first trunk line and the end station C, and a second branch input line and a second branch output line are arranged between the second trunk line and the end station C;
the backup state lightpath comprises: a third trunk line and a fourth trunk line provided between the end station a and the end station B, the third trunk line and the first trunk line sharing a pair of the changeover switch S1 and the changeover switch S2 at both ends thereof so that the end station B transmits a communication signal to the end station a through the first trunk line or so that the end station B transmits a communication signal to the end station a through the third trunk line, the fourth trunk line and the second trunk line sharing a pair of the changeover switch S3 and the changeover switch S4 at both ends thereof so that the end station a transmits a communication signal to the end station B through the second trunk line or so that the end station a transmits a communication signal to the end station B through the fourth trunk line;
a third branch input line and a third branch output line are arranged between the third trunk line and the end station C, and the input ends of the third branch input line and the first branch input line share one switch S5, so that the end station C transmits a communication signal to the end station A through the first branch input line, or the end station C transmits a communication signal to the end station A through the third branch input line; the output ends of the third branch output line and the first branch output line share one switch S6, so that the end station B transmits a communication signal to the end station C through the first branch output line, or the end station B transmits a communication signal to the end station C through the third branch output line;
a fourth branch input line and a fourth branch output line are arranged between the fourth trunk line and the end station C, and the input ends of the second branch input line and the fourth branch input line share one switch S7, so that the end station C transmits a communication signal to the end station B through the second branch input line, or the end station C transmits a communication signal to the end station B through the fourth branch input line; the outputs of the second branch input line and the fourth branch output line share a switch S8 to allow end station a to transmit communication signals to end station C via the second branch output line or allow end station a to transmit communication signals to end station C via the fourth branch output line.
2. The reconfigurable optical add/drop multiplexer according to claim 1, wherein the first trunk line comprises a first splitter (a 1) and a first wavelength selective switch (B1) connected in series, an input of the first splitter (a 1) being connected to an output of the end station B via a change-over switch S1, an output of the first wavelength selective switch (B1) being connected to an input of the end station a via a change-over switch S2;
the third trunk line comprises a fifth branching device (A5) and a fifth wavelength selection switch (B5) which are connected in sequence, wherein the input end of the fifth branching device (A5) is connected with the output end of the terminal station B through a changeover switch S1, and the output end of the fifth wavelength selection switch (B5) is connected with the input end of the terminal station A through a changeover switch S2.
3. The reconfigurable optical add/drop multiplexer according to claim 2, wherein said second trunk line comprises a second splitter (a 2) and a second wavelength selective switch (B2) connected in series, the input of said second splitter (a 2) being connected to the output of end station a via a change-over switch S3, the output of said second wavelength selective switch (B2) being connected to the input of end station B via a change-over switch S4;
the fourth trunk line comprises a sixth splitter (A6) and a sixth wavelength selective switch (B6) which are connected in sequence, wherein the input end of the sixth splitter (A6) is connected with the output end of the terminal station A through a change-over switch S3, and the output end of the sixth wavelength selective switch (B6) is connected with the input end of the terminal station B through a change-over switch S4.
4. The reconfigurable optical add/drop multiplexer according to claim 3, wherein the first branch input line comprises a third splitter (A3), the input of the third splitter (A3) being connected to a switch S5, the output of the third splitter (A3) being connected to a first wavelength selective switch (B1);
the third branch input line includes a seventh splitter (a 7), an input of the seventh splitter (a 7) is connected with a switch S5, and an output of the seventh splitter (a 7) is connected with a fifth wavelength selection switch (B5);
the first branch output line comprises a third wavelength selective switch (B3), the input end of the third wavelength selective switch (B3) is connected with the first shunt (A1), and the output end of the third wavelength selective switch (B3) is connected with the input end of the terminal station C through a change-over switch S6;
the third branch output line comprises a seventh wavelength selective switch (B7), the input end of the seventh wavelength selective switch (B7) is connected with the fifth branching device (A5), and the output end of the seventh wavelength selective switch (B7) is connected with the input end of the terminal station C through a change-over switch S6.
5. The reconfigurable optical add/drop multiplexer according to claim 4, wherein the second branch input line comprises a fourth splitter (A4), the input of the fourth splitter (A4) being connected to a switch S7, the output of the fourth splitter (A4) being connected to the input of a second wavelength selective switch (B2);
the fourth branch input line includes an eighth splitter (A8), an input of the eighth splitter (A8) is connected with the switch S7, and an output of the eighth splitter (A8) is connected with an input of a sixth wavelength selective switch (B6);
the second branch output line comprises a fourth wavelength selective switch (B4), the input end of the fourth wavelength selective switch (B4) is connected with the second shunt (A2), and the output end of the fourth wavelength selective switch (B4) is connected with the input end of the terminal station C through a change-over switch S8;
the fourth branch output line comprises an eighth wavelength selective switch (B8), an input of the eighth wavelength selective switch (B8) is connected with a sixth splitter (a 6), and an output of the eighth wavelength selective switch (B8) is connected with an input of the terminal station C through a change-over switch S8.
6. The reconfigurable optical add/drop multiplexer according to claim 5, wherein the first splitter (A1), the second splitter (A2), the third splitter (A3), the fourth splitter (A4), the fifth splitter (A5), the sixth splitter (A6), the seventh splitter (A7) and the eighth splitter (A8) split the incoming communication signal into two communication signals of equal power.
7. The reconfigurable optical add/drop multiplexer according to any of claims 1-6, wherein the reconfigurable optical add/drop multiplexer comprises an end station A input interface, an end station B input interface, an end station A output interface, an end station B output interface, two input interfaces of an end station C and two output interfaces of an end station C.
8. The reconfigurable optical add/drop multiplexer according to claim 1, wherein the switches S1, S2, S3, S4, S5, S6, S7 and S8 are a two-pole switch comprising a set state and a reset state.
9. The reconfigurable optical add/drop multiplexer according to claim 8, wherein the switch S1, the switch S2, the switch S3, the switch S4, the switch S5, the switch S6, the switch S7 and the switch S8 synchronously complete switching of the switch states so that the communication signal is transmitted through the backup state optical path or the main optical path.
10. The reconfigurable optical add/drop multiplexer according to claim 8, wherein the switch states of the switch S1, the switch S3, the switch S5 and the switch S6 are switched synchronously, and the switch states of the switch S2, the switch S4, the switch S7 and the switch S8 are switched synchronously according to the switched states of the switch S1, the switch S3, the switch S5 and the switch S6, so as to realize smooth switching of the main optical path or the backup optical path and normal transmission of the communication signals.
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