CN113067660B - Semi-active wavelength division multiplexing system - Google Patents

Semi-active wavelength division multiplexing system Download PDF

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Publication number
CN113067660B
CN113067660B CN202010003321.2A CN202010003321A CN113067660B CN 113067660 B CN113067660 B CN 113067660B CN 202010003321 A CN202010003321 A CN 202010003321A CN 113067660 B CN113067660 B CN 113067660B
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optical
channel
dividing
optical power
optical channel
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CN113067660A (en
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黄乐天
邓春胜
魏丽红
高军诗
马奔腾
王迎春
贺政
万奇
刘卓
吴超
高志英
李鑫
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China Mobile Communications Group Co Ltd
China Mobile Group Design Institute Co Ltd
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China Mobile Communications Group Co Ltd
China Mobile Group Design Institute Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • 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 embodiment of the invention provides a semi-active wavelength division multiplexing system, which comprises a remote passive device at an AAU/RRU side and a local active device at a DU/BBU side; the remote passive equipment comprises a first combining and dividing device and a dividing and dividing coupler, wherein a plurality of dividing ports of the first combining and dividing device are connected with a first color optical module of the AAU/RRU, a public port of the first combining and dividing device is connected with a total interface of the dividing and dividing coupler, a first dividing interface of the dividing and dividing coupler is connected with a main optical channel, and a second dividing interface of the dividing and dividing coupler is connected with a standby optical channel; the local side active equipment comprises a second multiplexer/demultiplexer and an optical switch, a plurality of sub-ports of the second multiplexer/demultiplexer are connected with a second color optical module of the DU/BBU, a public port of the second multiplexer/demultiplexer is connected with a first optical interface of the optical switch, a second optical interface of the optical switch is connected with a main optical channel, and a third optical interface is connected with a standby optical channel. The embodiment realizes the consideration of the optical fiber resource, the equipment power consumption and the protection function.

Description

Semi-active wavelength division multiplexing system
Technical Field
The invention relates to the technical field of communication equipment, in particular to a semi-active wavelength division multiplexing system.
Background
With the rapid development of mobile communication technology, the fifth generation mobile communication technology (5th generation mobile networks,5G) puts forward new requirements on the communication network of operators, and on the basis of the original 4G backhaul network, a 5G forward transmission network and a 5G medium/backhaul network are refined. In the 5G forwarding network, a communication connection between an active antenna Unit (Active Antenna Unit, AAU)/remote radio Unit (Remote Radio Unit, RRU) and a Distribution Unit (DU)/baseband processing Unit (Building Base band Unite, BBU) of the wireless base station device needs to be solved, and a port required for the communication connection is called a forwarding port. To solve this problem, the prior art has 3 types of solutions, namely, an optical fiber direct drive, a passive wavelength division multiplexing system and an active system solution.
The optical fiber direct-drive scheme is characterized in that the AAU/RRU and the DU/BBU are directly connected through point-to-point optical fibers between the front light transmission modules. The front light transmission module used in the optical fiber direct drive scheme can be divided into a double-fiber bidirectional light module and a single-fiber bidirectional light module, and the number of optical fibers required in the scheme is generally 2 times of the number of front light transmission ports (double-fiber bidirectional light module) or the same as the number of front light transmission ports (single-fiber bidirectional light module). However, the optical fiber direct-drive scheme has huge consumption on optical fiber resources, and the additional construction of the optical cable has the problems of construction investment, construction period, construction difficulty and the like; in addition, the scheme can not solve the problem of providing protection/recovery functions when the optical cable line faults occur, and the transmission profession can not monitor and manage the optical cable in a network, so that the optical cable faults are difficult to discover and process in time.
The characteristic of the passive wavelength division multiplexing scheme is that the color light module is used on AAU/RRU and DU/BBU equipment, and the wavelength division multiplexing technology is adopted to multiplex a plurality of wavelengths for transmission through a passive multiplexer-demultiplexer. Compared with the optical fiber direct drive scheme, the scheme has the advantages that the required optical fiber number can be reduced to at least less than 1/3 of the forward port number, and the ratio of the required optical fiber number to the forward port number can be reduced to 1/24 according to the adopted system capacity and the different wavelength division multiplexing technology. However, the passive wavelength division multiplexing scheme cannot meet the requirements of monitoring and managing 5G forward transmission, cannot provide a protection recovery function, and is unfavorable for convenience of construction and maintenance.
The active system scheme comprises various technical schemes such as active wavelength division multiplexing (Wavelength Division Multiplexing, WDM)/optical transport network (Optical Transport Network, OTN), slice packet network (Slicing Packet Network, SPN) and the like. The active system schemes adopt active equipment on two sides of the AAU/RRU and the DU/BBU, the number of the optical fibers of the forwarding network is reduced by different technical means, and the active equipment provides important functions such as monitoring, management, protection and recovery of the forwarding optical cable lines and services. Wherein the savings in the number of forward fibers by the active WDM scheme can be reduced to at most 1/24; the OTN scheme and the SPN scheme rely on different technologies to aggregate a plurality of low-speed forwarding ports into a line port with a rate of 100Gb/s or higher for transmission, and the saving ratio of the number of optical fibers is limited by the rate of the line port, and is generally 1/4 according to the prior art. However, the active system scheme is more complex in technology, the equipment cost and the equipment power consumption are far higher than those of the active system scheme, and the higher equipment power consumption further increases the cost of network operation; in addition, the active equipment on the AAU/RRU side needs power supply access, so that flexible deployment of the equipment is limited, and the difficulty of base station construction is increased; in addition, in the 5G standard, the requirement on the time delay index of the forward scene is strict, the active equipment can additionally introduce equipment time delay in the forward network, and the performance of the 5G network can be influenced to a certain extent; in addition, the OTN scheme and the SPN scheme are limited by the speed of the line port, and under the condition of the prior art, the difficulty of further improving the saving proportion of the optical fiber by adopting a high-speed port with the speed of more than 200G/s is high.
In summary, it is difficult to achieve the effects of saving optical fiber resources, reducing power consumption of devices, and protecting and recovering functions in the prior art.
Disclosure of Invention
The embodiment of the invention provides a semi-active wavelength division multiplexing system, which is used for taking account of the aspects of optical fiber resources, equipment power consumption, protection recovery function and the like in communication connection.
The embodiment of the invention provides a semi-active wavelength division multiplexing system, which comprises:
remote passive equipment arranged on the AAU/RRU side and local active equipment arranged on the DU/BBU side;
the remote passive device comprises a first combining and dividing device and a one-to-two coupler, wherein a plurality of dividing ports of the first combining and dividing device are connected with a plurality of first color light modules at the AAU/RRU side, a public port of the first combining and dividing device is connected with a total interface of the one-to-two coupler, a first dividing interface of the one-to-two coupler is connected with a first end of a main optical channel, and a second dividing interface is connected with a first end of a standby optical channel;
the local side active equipment comprises a second multiplexer/demultiplexer and an optical switch, wherein a plurality of sub-ports of the second multiplexer/demultiplexer are connected with a plurality of second color optical modules on the DU/BBU side, a public port of the second multiplexer/demultiplexer is connected with a first optical interface of the optical switch, a second optical interface of the optical switch is connected with a second end of a main optical channel, and a third optical interface of the optical switch is connected with a second end of a standby optical channel and is used for switching the main optical channel or the standby optical channel to be in a communication state.
Optionally, the local side active device further includes a first optical power detection module and a control module; the first optical power detection module is respectively connected with the control module and the second end of the main optical channel and is used for monitoring the optical power of the main optical channel, and when the optical power of the main optical channel is monitored to be smaller than a first preset threshold value, a first control signal is sent to the control module, and the control module switches the optical switch according to the first control signal so that the optical switch switches the communication channel from the main optical channel to the standby optical channel.
Optionally, the local side active device further includes a second optical power detection module, where the second optical power detection module is connected to the control module and the second end of the standby optical channel, and is configured to monitor optical power of the standby optical channel, and send a second control signal to the control module when it is monitored that the optical power of the standby optical channel is smaller than a second preset threshold, and the control module switches the optical switch according to the second control signal, so that the optical switch switches the communication channel from the standby optical channel to the main optical channel.
Optionally, the local side active device further includes a plurality of third optical power detection modules, the number of which is the same as that of the ports of the second multiplexer/demultiplexer; each third optical power detection module is connected with a sub-port of a second multiplexer/demultiplexer and is used for detecting the optical power of a channel corresponding to each corresponding sub-port and carrying out alarm indication when the optical power of the corresponding channel is detected to be smaller than a third preset threshold value.
Optionally, each third optical power detection module is connected with the control module, and is used for sending the detected optical power of the channel corresponding to each corresponding sub-port to the control module.
Optionally, the local side active device further includes a network management interface for accessing a network management system of the forwarding network.
According to the semi-active wavelength division multiplexing system provided by the embodiment of the invention, the far-end passive equipment is arranged on the AAU/RRU side, the local-end active equipment is arranged on the DU/BBU side, the first multiplexer/demultiplexer in the far-end passive equipment is connected with the one-to-two coupler, the optical switch is arranged in the local-end active equipment, the main optical channel and the standby optical channel separated by the one-to-two coupler are switched by the switching optical switch, so that the optical fiber resource is saved by the far-end passive equipment, the low power consumption is realized by the local-end active equipment, the communication protection function of the optical channel is realized by the one-to-two coupler and the optical switch, the compromise of the functions of saving the optical fiber resource, the low power consumption, the protection and the like is realized, the application scene is wide, and the system is convenient for mass production and floor application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a semi-active wdm system according to an embodiment of the present invention;
fig. 2 is a second schematic diagram of a semi-active wdm system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Specifically, as an important part of 5G construction, in order to promote 5G construction and achieve a strategy of 5G network deployment, a technical scheme is needed that satisfies low latency, low cost, monitoring, manageability, protection, and convenience in construction and maintenance. In the prior art, the optical fiber direct-drive scheme consumes larger optical fiber resources; the passive wavelength division multiplexing scheme has the best saving degree on optical fiber resources and lower cost, but has no network management and protection functions; the active system scheme has better saving degree on optical fiber resources and the best network management and protection capability, but the cost and the power consumption are far higher than those of the rest schemes. That is, the existing scheme cannot achieve a compromise in saving optical fiber resources, network management and protection capability, cost, power consumption and the like, and only can select a scheme according to a specific scene and pay corresponding cost.
In order to achieve a compromise in saving optical fiber resources, network management and protection capability, cost, power consumption and other schemes, the invention provides the following embodiments:
specifically, as shown in fig. 1, a schematic structural diagram of a semi-active wavelength division multiplexing system in an embodiment of the present invention is shown, where the semi-active wavelength division multiplexing system includes: remote passive equipment 1 arranged on the AAU/RRU side and local active equipment 2 arranged on the DU/BBU side;
the remote passive device 1 comprises a first multiplexer/demultiplexer 11 and a one-to-two coupler 12, wherein a plurality of sub-ports of the first multiplexer/demultiplexer 11 are connected with a plurality of first color light modules 3 on the AAU/RRU side, a common port of the first multiplexer/demultiplexer 11 is connected with a total interface of the one-to-two coupler, a first sub-interface of the one-to-two coupler 12 is connected with a first end of the main optical channel 4, and a second sub-interface is connected with a first end of the standby optical channel 5;
the local side active device 2 includes a second multiplexer/demultiplexer 21 and an optical switch 22, where multiple ports of the second multiplexer/demultiplexer 21 are connected to multiple second color optical modules 6 on the side of the DU/BBU, a common port of the second multiplexer/demultiplexer 21 is connected to a first optical interface of the optical switch 22, a second optical interface of the optical switch 22 is connected to a second end of the main optical channel 4, and a third optical interface of the optical switch 22 is connected to a second end of the spare optical channel 5, so as to switch the main optical channel 4 or the spare optical channel 5 to be in a communication state.
Specifically, by arranging the remote passive equipment on the AAU/RRU side and arranging the local side active equipment on the DU/BBU side, an asymmetric semi-active system is formed, so that the characteristics of the passive equipment on the AAU/RRU side and the characteristics of the active equipment on the DU/BBU side can be utilized, namely flexible deployment of the remote passive equipment on the AAU/RRU side is realized, the construction and maintenance are convenient, the low power consumption on the DU/BBU side is realized, and the balance between the optical fiber resource saving and the low power consumption is realized.
In addition, specifically, by connecting the multiple ports of the first multiplexer/demultiplexer 11 in the remote passive device 1 with the multiple first color optical modules 3 on the AAU/RRU side, multiplexing multiple wavelength transmission through the first multiplexer/demultiplexer 11 is achieved, and 2G/4G/5G service hybrid transmission can be supported, and each wavelength carries a receiving or transmitting signal of the wireless AAU/RRU color optical module. It should be noted that, of course, the transmission wavelength of the AAU/RRU may be specified to coincide with the reception wavelength of the DU/BBU.
In addition, specifically, the common port of the first multiplexer/demultiplexer 11 is connected to the total interface of the one-to-two couplers 12, and the first sub-interface of the one-to-two couplers 12 is connected to the first end of the main optical channel 4 (i.e. the main optical fiber), and the second sub-interface is connected to the first end of the standby optical channel 5 (i.e. the standby optical fiber), so that the first multiplexer/demultiplexer can receive two paths of optical signals of the main optical channel and the standby optical channel at the same time, thereby realizing the protection and recovery functions of the optical channels.
In addition, specifically, by setting the local side active device 2 on the side of the DU/BBU and connecting the multiple ports of the second multiplexer/demultiplexer 21 in the local side active device 2 with the multiple second color optical modules 6 on the side of the DU/BBU, multiplexing multiple wavelength transmissions by the second multiplexer/demultiplexer 21 is achieved, and the 2G/4G/5G service hybrid transmission can be supported, and each wavelength carries a transmission or reception signal of the wireless DU/BBU color optical module. It should be noted that the transmission wavelength of the DU/BBU may be defined to be identical to the reception wavelength of the AAU/RRU.
In addition, specifically, by setting the optical switch 22 in the local side active device 2, and connecting the first optical interface of the optical switch 22 with the public port of the second multiplexer/demultiplexer 21, the second optical interface of the optical switch 22 is connected with the second end of the main optical channel 4, and the third optical interface of the optical switch 22 is connected with the second end of the standby optical channel 5, so that the main optical channel 4 or the standby optical channel 5 can be switched to be in a communication state through the optical switch 22, thereby realizing that when the main optical channel 4 fails, the optical switch 22 can be switched to the standby optical channel 5, and when the standby optical channel 5 fails, the optical switch 22 can be switched to the main optical channel 4, and further realizing the communication protection function of the optical channel in communication connection.
In this way, in this embodiment, the remote passive device is set on the AAU/RRU side, the local side active device is set on the DU/BBU side, the first multiplexer/demultiplexer in the remote passive device is connected to the one-to-two coupler, the optical switch is set in the local side active device, and the main optical channel and the standby optical channel separated by the one-to-two coupler are switched by the switching optical switch, so that the saving of optical fiber resources is realized by the remote passive device, the low power consumption is realized by the local side active device, and the communication protection function of the optical channel is realized by the one-to-two coupler and the optical switch, so that the compromise of the functions of saving optical fiber resources, low power consumption, protection and the like is realized, the application scenario is wide, and the batch production and the floor application are facilitated.
Further, referring to fig. 2, the office active device 2 further includes a first optical power detection module 23 and a control module 24; the first optical power detection module 23 is respectively connected to the control module 24 and the second end of the main optical channel 4, and is configured to monitor the optical power of the main optical channel 4, and send a first control signal to the control module 24 when it is monitored that the optical power of the main optical channel 4 is smaller than a first preset threshold, where the control module 24 switches the optical switch 22 according to the first control signal, so that the optical switch 22 switches the communication channel from the main optical channel to the standby optical channel.
Specifically, by connecting the first optical power detection module 23 to the second end of the main optical channel 4, the optical power of the main optical channel 4 on the line can be monitored by the first optical power detection module 23. At this time, when the first optical power detection module 23 detects that the optical power of the main optical channel 4 is smaller than the first preset threshold, a first control signal indicating that the optical power is smaller than the first preset threshold may be sent to the control module 24, so that the control module 24 may control the optical switch to switch according to the first control signal, that is, the working channel is switched from the main optical channel 4 to the standby optical channel 5, so as to ensure normal communication of the optical channels, that is, ensure normal connection of communication, thereby implementing an optical power monitoring function of the line.
It should be noted that, when the first optical power detection module 23 detects that the optical power of the main optical channel 4 is smaller than the first preset threshold, an LOS alarm indication of the optical power of the line of the main optical channel may be sent, and the LOS alarm triggers the automatic switch 22 to switch the communication channel from the main optical channel 4 to the standby optical channel 5, so that the user is alerted, thereby implementing the functions of monitoring and alarming the optical power of the line.
It should be noted that, when the first optical power detection module 23 detects that the optical power of the main optical channel 4 decreases by more than the preset amplitude, the first control signal may also be sent to the control module 24 to control the optical switch to switch.
Furthermore, the local side active device 2 further includes a second optical power detection module 25, where the second optical power detection module 25 is respectively connected to the control module 24 and the second end of the standby optical channel 5, and is configured to monitor the optical power of the standby optical channel 5, and send a second control signal to the control module 24 when it is monitored that the optical power of the standby optical channel 5 is less than a second preset threshold, and the control module 24 switches the optical switch 22 according to the second control signal, so that the optical switch 22 switches the communication channel from the standby optical channel 5 to the main optical channel 4.
Specifically, by connecting the second optical power detection module 25 to the second end of the spare optical channel 5, the optical power of the spare optical channel 5 on the line can be monitored by the second optical power detection module 25. At this time, when the second optical power detection module 25 detects that the optical power of the standby optical channel 5 is smaller than the second preset threshold, a second control signal indicating that the optical power is smaller than the second preset threshold may be sent to the control module 24, so that the control module 24 may control the optical switch 22 to switch according to the second control signal, that is, the working channel is switched from the standby optical channel 5 to the main optical channel 4, so as to ensure normal communication of the optical channels, that is, ensure normal connection of communication, thereby implementing an optical power monitoring function of the line.
It should be noted that, when the second optical power detection module 25 detects that the optical power of the standby optical channel 5 is smaller than the second preset threshold, an LOS alarm indication of the optical power of the line of the standby optical channel may be sent, and the automatic switch 22 is triggered by the LOS alarm to switch the communication channel from the standby optical channel 5 to the main optical channel 4, so that the user is alerted, thereby implementing the functions of monitoring and alerting the optical power of the line.
It should be noted that, when the second optical power detection module 25 detects that the optical power of the standby optical channel 5 decreases by more than the preset amplitude, the second control signal may also be sent to the control module 24 to control the optical switch to switch.
Of course, it should be noted that, when the communication channel is a standby optical channel and the first optical power detection module 23 detects that the optical power of the main optical channel is greater than the first preset threshold, the second control signal may also be sent to the control module 24 to control the optical switch to switch. Of course, it is also possible to manually switch back to the main light channel.
Further, with continued reference to fig. 2, the local side active device 2 further includes a plurality of third optical power detection modules 26, which are the same as the number of ports of the second multiplexer/demultiplexer 21; each third optical power detection module 26 is connected to a port of the second multiplexer/demultiplexer 21, and is configured to detect optical power of a channel corresponding to each corresponding port, and perform alarm indication when the detected optical power of the corresponding channel is less than a third preset threshold.
Specifically, each sub-port of the second multiplexer/demultiplexer 21 is connected to a third optical power detection module 26 to detect the optical power of the channel corresponding to each corresponding sub-port, so as to realize the monitoring of the optical power of each channel; in addition, by performing alarm indication when the optical power of the corresponding channel is detected to be smaller than the third preset threshold, the user can judge the service corresponding to a certain wavelength and the fault condition of the color optical module according to the alarm indication.
Of course, each third optical power detection module 26 is connected to the control module 24, and is configured to send the detected optical power of the channel corresponding to each corresponding split port to the control module 24. This allows the control module 24 to know the optical power of each channel in time, so that the control module 24 can manage performance, faults, and the like of the system according to the known optical power.
In addition, the local side active device 2 further comprises a network management interface of a network management system for accessing the forwarding network, so that functions such as configuration management, fault management, performance management, network topology management and the like can be performed on the forwarding network and the device through the network management system.
In this way, in the semi-active wavelength division multiplexing system provided in this embodiment, the remote passive device is set on the AAU/RRU side, the local active device is set on the DU/BBU side, the first multiplexer/demultiplexer in the remote passive device is connected to the one-to-two coupler, the optical switch is set in the local active device, and the main optical channel and the standby optical channel separated by the one-to-two coupler are switched by the switching optical switch, so that the saving of optical fiber resources is realized by the remote passive device, the low power consumption is realized by the local active device, and the communication protection function of the optical channel is realized by the one-to-two coupler and the optical switch, so that the compromise of the functions of saving optical fiber resources, low power consumption, protection and the like is realized, the application scenario is wide, and the system is convenient for mass production and floor application.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A semi-active wavelength division multiplexing system, comprising:
remote passive equipment arranged on the AAU/RRU side and local active equipment arranged on the DU/BBU side;
the remote passive device comprises a first combining and dividing device and a one-to-two coupler, wherein a plurality of dividing ports of the first combining and dividing device are connected with a plurality of first color light modules at the AAU/RRU side, a public port of the first combining and dividing device is connected with a total interface of the one-to-two coupler, a first dividing interface of the one-to-two coupler is connected with a first end of a main optical channel, and a second dividing interface is connected with a first end of a standby optical channel;
the local side active device comprises a second multiplexer/demultiplexer and an optical switch, wherein a plurality of sub-ports of the second multiplexer/demultiplexer are connected with a plurality of second color optical modules at the DU/BBU side, a public port of the second multiplexer/demultiplexer is connected with a first optical interface of the optical switch, a second optical interface of the optical switch is connected with a second end of the main optical channel, and a third optical interface of the optical switch is connected with a second end of the standby optical channel and is used for switching the main optical channel or the standby optical channel to be in a communication state;
the local side active equipment further comprises a first optical power detection module and a control module; the first optical power detection module is respectively connected with the control module and the second end of the main optical channel and is used for monitoring the optical power of the main optical channel, when the optical power of the main optical channel is monitored to be smaller than a first preset threshold value, a first control signal is sent to the control module, and the control module switches the optical switch according to the first control signal so that the optical switch switches the communication channel from the main optical channel to the standby optical channel;
when the first optical power detection module detects that the optical power reduction amplitude of the main optical channel is larger than a preset amplitude value, the first control signal is also sent to the control module so as to control the optical switch to switch.
2. The system of claim 1, wherein the local side active device further comprises a second optical power detection module, wherein the second optical power detection module is respectively connected to the control module and a second end of the standby optical channel, and is configured to monitor an optical power of the standby optical channel, and when it is monitored that the optical power of the standby optical channel is less than a second preset threshold, send a second control signal to the control module, and the control module switches the optical switch according to the second control signal, so that the optical switch switches the communication channel from the standby optical channel to the main optical channel.
3. The system of claim 1, wherein the local side active device further comprises a plurality of third optical power detection modules equal to the number of ports of the second multiplexer/demultiplexer; each third optical power detection module is connected with a sub-port of a second multiplexer/demultiplexer and is used for detecting the optical power of a channel corresponding to each corresponding sub-port and carrying out alarm indication when the optical power of the corresponding channel is detected to be smaller than a third preset threshold value.
4. A semi-active wavelength division multiplexing system in accordance with claim 3 wherein each of said third optical power detection modules is coupled to said control module for transmitting detected optical power of a channel corresponding to each respective sub-port to said control module.
5. The system according to any one of claims 1 to 4, wherein the office-side active device further comprises a network management interface for accessing a network management system of the forwarding network.
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