CN108055082B - C-RAN system-based single-fiber bidirectional optical line system - Google Patents
C-RAN system-based single-fiber bidirectional optical line system Download PDFInfo
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- CN108055082B CN108055082B CN201711124423.4A CN201711124423A CN108055082B CN 108055082 B CN108055082 B CN 108055082B CN 201711124423 A CN201711124423 A CN 201711124423A CN 108055082 B CN108055082 B CN 108055082B
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/25073—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion using spectral equalisation, e.g. spectral filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Abstract
The invention discloses a single-fiber bidirectional optical line system based on a C-RAN system, which relates to the field of mobile communication and at least comprises the following components: the BBU preprocessing unit is in signal connection with the BBU equipment pool and is used for carrying out signal transmission with the BBU equipment pool; an ODN unit, the ODN unit comprising: the first optical comb filter is used for splitting the signal into odd waves and even waves and integrating and transmitting the signal to the BBU preprocessing unit; a first filter and a second filter in signal connection with the first optical comb filter, the first filter for transmitting odd waves and the second filter for transmitting even waves; the number of the site transmitting ends is even, and the site transmitting ends are equally divided into two groups; a plurality of RRU preprocessing units. The invention establishes a single-fiber bidirectional optical path, reduces the degree of signal mutual interference during bidirectional transmission and reduces the loss of an optical link.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a single-fiber bidirectional optical line system based on a C-RAN system.
Background
In the current mobile communication field, a C-RAN architecture mobile communication system based on DWDM (dense optical wavelength multiplexing) technology is gradually becoming the best carrier of a distributed 4G communication system;
due to the increasing shortage of optical fiber resources of the access layer, when the DWDM equipment is used by the access layer to carry CPRI (common public radio interface) services, a single-fiber bidirectional application scenario often occurs;
however, in the application process of single-fiber bidirectional, signals interfere with each other, and the optical link generates large loss, which has a certain influence on the daily signal transmission work.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a single-fiber bidirectional optical line system based on a C-RAN system, which reduces the degree of mutual interference of signals during bidirectional transmission and reduces the loss of an optical link while establishing a single-fiber bidirectional optical path.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a single-fiber bidirectional optical line system based on a C-RAN system, comprising at least:
the BBU preprocessing unit is in signal connection with the BBU equipment pool and is used for carrying out signal transmission with the BBU equipment pool;
-an ODN unit comprising:
-a first optical comb filter for splitting the signal into odd and even waves and for transmitting signal integration to the BBU pre-processing unit;
-a first filter and a second filter in signal connection with said first optical comb filter, said first filter for transmitting said odd waves and said second filter for transmitting said even waves;
-a plurality of site transmitters, the number of said site transmitters being an even number, the plurality of said site transmitters being equally divided into two groups, one of said site transmitters being in signal connection with said first filter, the other of said site transmitters being in signal connection with said second filter;
the wiring system further includes:
a plurality of RRU preprocessing units, which are in one-to-one signal connection with the plurality of station transmitting ends, and are further in signal connection with RRU equipment; wherein the content of the first and second substances,
the RRU preprocessing unit comprises:
the second optical wave multiplexer is used for carrying out signal transmission with the corresponding site sending end;
a second optical service forwarding disk in signal connection with the second optical wave multiplexer, where the second optical service forwarding disk is used for performing signal transmission with the RRU device and is also used for performing signal transmission with the second optical wave multiplexer;
the number of the station transmitting ends is not less than the number of the second optical wave multiplexers.
On the basis of the technical scheme, the BBU preprocessing unit comprises:
a plurality of first optical service forwarding disks, where the first optical service forwarding disks are used for performing signal transmission with the BBU device pool;
and the first optical wave multiplexer is in signal connection with the plurality of first optical service forwarding disks respectively, is used for integrating signals transmitted by the plurality of first optical service forwarding disks, transmitting the signals to the first optical comb filter, and is also used for receiving, splitting and transmitting the signals transmitted by the first optical comb filter to the plurality of first optical service forwarding disks.
On the basis of the above technical solution, when the number of the second optical wave multiplexers is less than the number of the site transmitting terminals, the excess number of the site transmitting terminals are left unused, and the remaining site transmitting terminals are connected with the second optical wave multiplexers in a one-to-one pairing manner.
On the basis of the technical scheme, the first optical wave multiplexer is a 96-wave AAWG.
On the basis of the above technical solution, the ODN unit further includes: a first optical coupler;
the wiring system further includes:
an OLP near-end monitoring protection device, comprising:
a first optical switch;
the two second optical couplers are respectively provided with an optical filter, and the optical filter is in signal connection with the photodiodes;
the first optical switch is used for receiving signals transmitted by the BBU preprocessing unit, grouping the signals, respectively transmitting the signals to the two second optical couplers, receiving the signals transmitted by the two second optical couplers, integrating the signals and transmitting the signals to the BBU preprocessing unit;
the second optical coupler is used for receiving signals transmitted by the first optical switch and dividing the signals into two groups of signals, one group of signals is transmitted to the first optical coupler, the other group of signals is transmitted to the optical filter sheet corresponding to the second optical coupler, the second optical coupler is also used for receiving signals transmitted by the first optical coupler and dividing the signals into two groups of signals, one group of signals is transmitted to the first optical switch, and the other group of signals is transmitted to the optical filter sheet corresponding to the second optical coupler;
the first optical coupler is used for receiving signals transmitted by the first optical comb filter, grouping the signals, respectively transmitting the signals to the two second optical couplers, receiving the signals transmitted by the two second optical couplers, integrating the signals and further transmitting the signals to the first optical comb filter.
On the basis of the technical scheme, the second optical coupler is an optical coupler with a splitting ratio of 2:98, and is used for receiving signals transmitted by the first optical switch and dividing the signals into two groups of signals, 98% of the signals are transmitted to the first optical coupler, 2% of the signals are transmitted to the optical filter corresponding to the second optical coupler, and is also used for receiving signals transmitted by the first optical coupler and dividing the signals into two groups of signals, 98% of the signals are transmitted to the first optical switch, and 2% of the signals are transmitted to the optical filter corresponding to the second optical coupler.
On the basis of the technical scheme, the first optical coupler is an optical coupler with the light splitting ratio of 50: 50.
Compared with the prior art, the invention has the advantages that:
(1) the invention establishes a single-fiber bidirectional optical path, reduces the degree of signal mutual interference during bidirectional transmission and reduces the loss of an optical link.
(2) According to the invention, redundant site transmitting ends are idled according to actual requirements, and on the premise of ensuring the smooth work of the invention, a proper number of site transmitting ends are selected to be connected with the second optical wave multiplexer.
(3) The invention separates the optical signal by using the second optical coupler, filters the impurity optical signal by using the optical filter, provides data basis for monitoring optical power and troubleshooting through the photodiode, and provides convenience for daily work.
Drawings
Fig. 1 is a block diagram of a C-RAN system single-fiber bidirectional optical line system according to embodiment 1 of the present invention;
fig. 2 is a block diagram of a C-RAN system single-fiber bidirectional optical line system according to embodiment 1 of the present invention;
fig. 3 is a block diagram of a C-RAN system single-fiber bidirectional optical line system according to embodiment 3 of the present invention;
fig. 4 is a block diagram of an OLP near-end monitoring line system according to embodiment 3 of the present invention;
in the figure: 1. a BBU preprocessing unit; 101. a first optical service forwarding disk; 102. a first optical wave multiplexer; 2. an ODN unit; 201. a first optical comb filter; 202. a first filter; 203. a second filter; 204. a site sending end; 205. a first optical coupler; 3. an RRU preprocessing unit; 301. a second optical multiplexer; 302. a second optical service forwarding disk; 4. an OLP near-end monitoring protection device; 401. a first optical switch; 402. a second optical coupler; 403. a light filter; 404. a photodiode.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a single-fiber bidirectional optical line system based on a C-RAN system, which at least includes: the system comprises a BBU preprocessing unit 1, wherein the BBU preprocessing unit 1 is in signal connection with a BBU equipment pool and is used for carrying out signal transmission with the BBU equipment pool; an ODN unit 2, the ODN unit 2 comprising: the first optical comb filter 201 is used for splitting the signal into odd waves and even waves, and integrating and transmitting the signal to the BBU preprocessing unit 1; a first filter 202 and a second filter 203 in signal connection with the first optical comb filter 201, the first filter 202 for transmitting odd waves and the second filter 203 for transmitting even waves; a plurality of site transmitters 204, the number of the site transmitters 204 is an even number, the plurality of site transmitters 204 are equally divided into two groups, one group of the site transmitters 204 is in signal connection with the first filter 202, and the other group of the site transmitters 204 is in signal connection with the second filter 203; the line system further comprises: the multiple RRU preprocessing units 3 are in one-to-one corresponding signal connection with the multiple station sending ends 204, and the RRU preprocessing unit 3 is further in signal connection with RRU equipment.
When an optical signal is sent by a BBU device pool, first, a BBU preprocessing unit 1 is used for collection and integration, a first optical comb filter 201 is used for wave division processing, 96 waves are divided into 48 odd waves and 48 even waves, the separation is based on a wave band, the odd waves and the even waves are respectively distributed to a first filter 202 and a second filter 203 through the first optical comb filter 201, the optical signal is distributed to station sending ends 204 which are correspondingly connected with the station sending ends through the first filter 202 and the second filter 203, it needs to be noted that the number of the optical signals received by each station sending end 204 is equal, the optical signals are sent to corresponding RRU preprocessing units 3 through the station sending ends 204, and finally the optical signals are transmitted to RRU devices;
when the RRU device sends an optical signal, the RRU preprocessing unit 3 is first used to transmit the optical signal to the station sending end 204 corresponding to the RRU device, and then the optical signal is integrated into odd waves and even waves by the first filter 202 and the second filter 203, and then integrated by the first optical comb filter 201, and then transmitted to the BBU preprocessing unit 1, and finally transmitted to the BBU device pool.
It should be noted that, when the first optical comb filter 201 splits the wave, if there are 96 waves, the first wave is an odd wave, the second wave is an even wave, and the first wave and the second wave are grouped at intervals, and are finally split into 48 odd waves and 48 even waves;
if there are 4 waves, the 1 st and 3 rd waves are odd waves, and the 2 nd and 4 th waves are even waves.
The models of the first filter 202 and the second filter 203 are the same, and the specific model is selected according to the number of the station transmitting ends 204.
In addition, the BBU device pool contains a plurality of BBU devices.
The invention establishes a single-fiber bidirectional optical path, reduces the degree of signal mutual interference during bidirectional transmission and reduces the loss of an optical link.
It should be noted that the C-RAN is a novel Radio access network architecture, and the C-RAN is specifically a green Radio access network architecture (Clean system) based on Centralized Processing (Centralized Processing), cooperative Radio (Collaborative Radio) and Real-time Cloud computing architecture (Real-time Cloud Infrastructure);
the BBU equipment is a baseband processing unit;
the RRU equipment is a radio remote unit.
Example 2
Referring to fig. 2, an embodiment of the present invention provides a single-fiber bidirectional optical line system based on a C-RAN system, which is different from embodiment 1 in that a BBU preprocessing unit 1 includes: the system comprises a plurality of first optical service forwarding disks 101, wherein the first optical service forwarding disks 101 are used for carrying out signal transmission with a BBU (base band unit) equipment pool; the first optical wave multiplexer 102, the first optical wave multiplexer 102 is respectively in signal connection with the plurality of first optical service forwarding disks 101, and is configured to integrate signals transmitted from the plurality of first optical service forwarding disks 101, and transmit the signals to the first optical comb filter 201, and is further configured to receive signals transmitted from the first optical comb filter 201, split the signals, and transmit the split signals to the plurality of first optical service forwarding disks 101;
when the BBU device pool sends signals to the first optical service forwarding disk 101, the first optical service forwarding disk 101 is used to transmit signals of the BBU device pool and record, the first optical wave multiplexer 102 is used to integrate signals transmitted by a plurality of first optical service forwarding disks 101 and send the signals to the first optical comb filter 201,
when the first optical comb filter 201 sends a signal to the first optical wave multiplexer 102, the first optical wave multiplexer 102 is first used to split the signal, and the first optical wave multiplexer 102 is used to send the split signal to the plurality of first optical service forwarding disks 101, and the finally split signal is transmitted to the BBU device pool by the plurality of first optical service forwarding disks 101, and is specifically transmitted to the BBU devices in the BBU device pool.
In this embodiment, the RRU preprocessing unit 3 includes:
the second optical wave multiplexer 301 is configured to perform signal transmission with the corresponding station sending end 204;
and a second optical service forwarding disc 302 in signal connection with the second optical wave multiplexer 301, where the second optical service forwarding disc 302 is used for performing signal transmission with the RRU device, and is also used for performing signal transmission with the second optical wave multiplexer 301.
When the RRU device needs to send a signal to the RRU preprocessing unit 3, the RRU device signal is received by the second optical service forwarding disc 302 and transmitted to the second optical wave multiplexer 301, and during the transmission process, the signal can be effectively monitored, and finally the second optical wave multiplexer 301 transmits the signal to the station sending end 204 correspondingly connected thereto;
when the station sending end 204 sends a signal to the RRU preprocessing unit 3, the second optical wave multiplexer 301 is first used to process odd waves or even waves sent by the station sending end 204, separate service waves and monitor waves therein, transmit the service waves and the monitor waves through the second optical service forwarding disc 302, and finally send the service waves to the RRU device.
In this embodiment, the number of the station sending terminals 204 is not less than the number of the second optical wave multiplexers 301;
thereby ensuring that each second optical multiplexer 301 has a station-sending end 204 connected to its corresponding signal.
In this embodiment, when the number of the second optical wave multiplexers 301 is less than the number of the site transmitting ends 204, the excess site transmitting ends 204 are left unused, and the remaining site transmitting ends 204 are connected to the second optical wave multiplexers 301 in a one-to-one matching manner;
according to actual requirements, redundant site transmitting terminals 204 are left unused, and on the premise of ensuring the smooth operation of the present invention, a suitable number of site transmitting terminals 204 are selected to connect with the second optical wave multiplexer 301.
In this embodiment, the first optical multiplexer 102 is a 96-wave AAWG;
the maximum contact capacity of a single station is 10 traffic waves and one OSC wave, plus 6 waves for the intermediate interval, for a total of (10+1) × 2 × 4+6 ═ 94, so it is necessary to use 96 waves AAWG to meet the maximum traffic demand.
In this embodiment, the first optical comb filter 201 divides the signal into odd waves and even waves according to the wave band, where odd waves are the wave band and even waves are the wave band.
The first optical service forwarding disc 101 and the second optical service forwarding disc 302 have a signal transmission function, and can record transmission work of the first optical service forwarding disc and the second optical service forwarding disc.
Example 3
Referring to fig. 3 and 4, an embodiment of the present invention provides a single-fiber bidirectional optical line system based on a C-RAN system, which is different from embodiments 1 and 2 in that the line system further includes: the OLP near-end monitoring protection device 4, the OLP near-end monitoring protection device 4 includes: a first optical switch 401; two second optical couplers 402, each of the two second optical couplers 402 is provided with an optical filter 403, and the optical filters 403 are in signal connection with the photodiodes 404; a first optical coupler 205;
the first optical switch 401 is configured to receive signals transmitted from the BBU preprocessing unit 1, perform grouping, and transmit the signals to the two second optical couplers 402, and is further configured to receive signals transmitted from the two second optical couplers 402, perform integration, and transmit the signals to the BBU preprocessing unit 1;
the second optical coupler 402 is used for receiving signals transmitted from the first optical switch 401 and dividing the signals into two groups of signals, wherein the signals of one group are transmitted to the first optical coupler 205, the signals of the other group are transmitted to the optical filter 403 corresponding to the second optical coupler 402, the signals transmitted from the first optical coupler 205 are further received and divided into two groups of signals, the signals of one group are transmitted to the first optical switch 401, and the signals of the other group are transmitted to the optical filter 403 corresponding to the second optical coupler 402;
the first optical coupler 205 is configured to receive signals transmitted from the first optical comb filter 201, perform grouping, and transmit the signals to the two second optical couplers 402, and is further configured to receive signals transmitted from the two second optical couplers 402, perform integration, and transmit the signals to the first optical comb filter 201.
The first optical coupler 205 is an optical coupler having a splitting ratio of 50:50, i.e., a received signal is divided into two or two signals are integrated into one.
The OLP near-end monitoring and protecting device 4 is mainly used for detecting the power of signals, and because the invention uses a single-fiber bidirectional technology, namely, optical signals sent by a BBU device pool and an RRU device simultaneously exist on one optical fiber;
when an RRU device sends an optical signal, the optical signal is transmitted to the OLP near-end monitoring protection device 4, the optical signal is first divided into two groups by the second optical coupler 402, the optical signal is separated by the second optical coupler 402, 98% of the optical signal is sent to the first optical switch 401 to be continuously integrated and transmitted to the BBU preprocessing unit 1, while 2% of the optical signal is filtered by the optical filter 403, the signals sent by the BBU device pool and the RRU device are optical signals, and therefore the optical signal is converted into an electrical signal by the photodiode 404, so that the power of the optical signal is detected by the converted electrical signal, and a data basis is provided for checking a fault, so as to further determine whether the fault exists.
The invention separates the optical signal by using the second optical coupler 402, filters the impurity optical signal by using the optical filter 403, provides data basis for monitoring optical power and troubleshooting by using the photodiode 404, and provides convenience for daily work.
In this embodiment, the second optical coupler 402 is an optical coupler with a splitting ratio of 2:98, the second optical coupler 402 is configured to receive a signal transmitted from the first optical switch 401 and divide the signal into two groups of signals, 98% of the signal is transmitted to the first optical coupler 205, 2% of the signal is transmitted to the optical filter 403 corresponding to the second optical coupler 402, the second optical coupler 402 is further configured to receive a signal transmitted from the first optical coupler 205 and divide the signal into two groups of signals, 98% of the signal is transmitted to the first optical switch 401, and 2% of the signal is transmitted to the optical filter 403 corresponding to the second optical coupler 402.
When the power of the signal needs to be checked, the power of the converted electrical signal is detected only because the photodiode 404 can convert the optical signal into the electrical signal;
in addition, when the power is abnormal, the working personnel can also be used as a data basis for troubleshooting.
The optical signal is separated by the second optical coupler, the optical filter is used for filtering the impurity optical signal, and a data basis is provided for monitoring the optical power and troubleshooting through the photodiode, so that convenience is provided for daily work.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone with the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, are within the protection scope.
Claims (7)
1. A single-fiber bidirectional optical line system based on a C-RAN system, wherein the line system at least comprises:
the system comprises a BBU preprocessing unit (1), wherein the BBU preprocessing unit (1) is in signal connection with a BBU equipment pool and is used for carrying out signal transmission with the BBU equipment pool;
-an ODN unit (2), the ODN unit (2) comprising:
-a first optical comb filter (201), said first optical comb filter (201) being configured to split a signal into odd and even waves and to transmit signal integration to said BBU pre-processing unit (1);
-a first filter (202) and a second filter (203) in signal connection with said first optical comb filter (201), said first filter (202) being adapted to transmit said odd waves and said second filter (203) being adapted to transmit said even waves;
-a plurality of site senders (204), said site senders (204) being an even number, said site senders (204) being equally divided into two sets, one set of said site senders (204) being in signal connection with said first filter (202), the other set of said site senders (204) being in signal connection with said second filter (203);
the wiring system further includes:
-a plurality of RRU pre-processing units (3), the plurality of RRU pre-processing units (3) being in signal-to-one correspondence with the plurality of station transmitting ends (204), the RRU pre-processing units (3) being further in signal connection with RRU equipment;
wherein the RRU pre-processing unit (3) comprises:
the second optical multiplexer (301) is used for carrying out signal transmission with the corresponding station transmitting end (204);
a second optical service forwarding disk (302) in signal connection with the second optical wave multiplexer (301), where the second optical service forwarding disk (302) is used for performing signal transmission with the RRU device and is also used for performing signal transmission with the second optical wave multiplexer (301);
the number of the station transmitting ends (204) is not less than the number of the second optical wave multiplexers (301).
2. A single fiber bidirectional optical line system based on a C-RAN system according to claim 1, wherein the BBU pre-processing unit (1) comprises:
a plurality of first optical service forwarding disks (101), the first optical service forwarding disks (101) being configured to perform signal transmission with the BBU device pool;
the first optical wave multiplexer (102), the first optical wave multiplexer (102) is respectively in signal connection with the plurality of first optical service forwarding disks (101), and is configured to integrate signals transmitted from the plurality of first optical service forwarding disks (101), and send the signals to the first optical comb filter (201), and is further configured to receive signals transmitted from the first optical comb filter (201), split the signals, and send the signals to the plurality of first optical service forwarding disks (101).
3. The C-RAN system-based single-fiber bidirectional optical line system of claim 1, wherein when the number of the second optical wavelength multiplexers (301) is less than the number of the site transmitters (204), an excess number of the site transmitters (204) are idle, and the remaining site transmitters (204) are connected to the second optical wavelength multiplexers (301) in a one-to-one pairing manner.
4. A C-RAN system based single fiber bidirectional optical line system according to claim 2, wherein the first optical multiplexer (102) is a 96 wave AAWG.
5. A single-fiber bidirectional optical line system based on a C-RAN system according to claim 1, wherein the ODN unit (2) further comprises: a first optical coupler (205); the wiring system further includes:
an OLP near-end monitoring protection device (4), the OLP near-end monitoring protection device (4) comprising:
a first optical switch (401);
two second optical couplers (402), wherein optical filters (403) are respectively arranged on the two second optical couplers (402), and the optical filters (403) are in signal connection with a plurality of photodiodes (404);
the first optical switch (401) is configured to receive signals transmitted by the BBU preprocessing unit (1), perform grouping, and respectively send the signals to the two second optical couplers (402), and is further configured to receive signals transmitted by the two second optical couplers (402), perform integration, and send the signals to the BBU preprocessing unit (1);
the second optical coupler (402) is used for receiving signals transmitted by the first optical switch (401) and dividing the signals into two groups of signals, wherein the signals of one group are transmitted to the first optical coupler (205), the signals of the other group are transmitted to the optical filter (403) corresponding to the second optical coupler (402), the signals transmitted by the first optical coupler (205) are further received and divided into two groups of signals, the signals of one group are transmitted to the first optical switch (401), and the signals of the other group are transmitted to the optical filter (403) corresponding to the second optical coupler (402);
the first optical coupler (205) is configured to receive signals transmitted by the first optical comb filter (201), perform grouping, and respectively send the signals to the two second optical couplers (402), and is further configured to receive signals transmitted by the two second optical couplers (402), perform integration, and further transmit the signals to the first optical comb filter (201).
6. The C-RAN system-based single-fiber bidirectional optical line system of claim 5, wherein: the second optical coupler (402) is an optical coupler with a splitting ratio of 2:98, the second optical coupler (402) is used for receiving signals transmitted by the first optical switch (401) and dividing the signals into two groups of signals, 98% of the signals are transmitted to the first optical coupler (205), 2% of the signals are transmitted to the optical filter (403) corresponding to the second optical coupler (402), the second optical coupler is also used for receiving signals transmitted by the first optical coupler (205) and dividing the signals into two groups of signals, 98% of the signals are transmitted to the first optical switch (401), and 2% of the signals are transmitted to the optical filter (403) corresponding to the second optical coupler (402).
7. The C-RAN system-based single-fiber bidirectional optical line system of claim 5, wherein:
the first optical coupler (205) is an optical coupler having a spectral ratio of 50: 50.
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