CN108055082A - A kind of single-fiber bidirectional optical line system based on C-RAN systems - Google Patents
A kind of single-fiber bidirectional optical line system based on C-RAN systems Download PDFInfo
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- CN108055082A CN108055082A CN201711124423.4A CN201711124423A CN108055082A CN 108055082 A CN108055082 A CN 108055082A CN 201711124423 A CN201711124423 A CN 201711124423A CN 108055082 A CN108055082 A CN 108055082A
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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
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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
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of single-fiber bidirectional optical line systems based on C RAN systems, are related to moving communicating field, include at least：BBU pretreatment units, BBU pretreatment units are connected with BBU equipment pond signal, for carrying out signal transmission with BBU equipment pond；ODN units, ODN units include：First optical interleaver, the first optical interleaver are used to signal being split as strange ripple, even ripple, are additionally operable to signal integration being transferred to BBU pretreatment units；The first filter and second filter being connected with the first optical interleaver signal, first filter are used for transmission strange ripple, and second filter is used for transmission even ripple；Multiple website transmitting terminals, the quantity of website transmitting terminal is even number, and multiple website transmitting terminals are divided into two groups；Multiple RRU pretreatment units.While the present invention establishes single fiber bi-directional light path, degree that signal when alleviating transmitted in both directions interferes with each other reduces the loss of optical link.
Description
Technical field
The present invention relates to moving communicating fields, and in particular to a kind of single fiber bi-directional optical link system based on C-RAN systems
System.
Background technology
In current mobile communications field, the C-RAN framework mobile communication system based on DWDM (intensive light wave multiplexing) technology
System has been increasingly becoming the optimum carrier of distributed 4G communication systems；
And since access layer fiber resource is increasingly in short supply, cause to carry CPRI (general public affairs using DWDM equipment in access layer
Altogether radio interface) business when, often there are the application scenarios of single fiber bi-directional；
But in the application process of single fiber bi-directional, signal interferes with each other, and larger loss occurs in optical link, to daily letter
Number transmission work have some impact on.
The content of the invention
For defect in the prior art, it is an object of the invention to provide a kind of single fibers based on C-RAN systems
Bi-directional optical line system, while establishing single fiber bi-directional light path, journey that signal when alleviating transmitted in both directions interferes with each other
Degree, reduces the loss of optical link.
To achieve the above objectives, the present invention adopts the technical scheme that：
A kind of single-fiber bidirectional optical line system based on C-RAN systems, includes at least：
- BBU pretreatment units, the BBU pretreatment units are connected with BBU equipment pond signal, for being set with the BBU
Standby pond carries out signal transmission；
- ODN units, the ODN units include：
-- the first optical interleaver, first optical interleaver are used to signal being split as strange ripple, idol
Ripple is additionally operable to signal integration being transferred to the BBU pretreatment units；
-- the first filter and second filter being connected with the first optical interleaver signal, described first
Wave filter is used for transmission the strange ripple, and the second filter is used for transmission the even ripple；
-- multiple website transmitting terminals, the quantity of the website transmitting terminal is even number, and multiple website transmitting terminals are divided into
Two groups, website transmitting terminal described in one of which is connected with the first filter signal, website transmitting terminal described in another group and institute
State the connection of second filter signal；
The line system further includes：
- multiple RRU pretreatment units, multiple RRU pretreatment units are corresponded with multiple website transmitting terminals
Signal connects, and the RRU pretreatment units are also connected with RRU device signal.
Based on the above technical solutions, the BBU pretreatment units include：
Multiple first smooth business forwarding disks, the first smooth business forwarding disk are used to carry out signal with the BBU equipment pond
Transmission；
First light wave multiplexer, the first light wave multiplexer forward disk signals with multiple first smooth business respectively
Connection for integrating the signal that multiple first smooth business forwarding disks transmit, and is sent to the first optics comb filtering
Device is additionally operable to receive the signal that first optical interleaver transmits, and is split, and is sent to multiple described first
Light business forwards disk.
Based on the above technical solutions, the RRU pretreatment units include：
Second light wave multiplexer, for carrying out signal transmission with the corresponding website transmitting terminal；
The second smooth business forwarding disk being connected with the second light wave mux signal, the second smooth business forwarding disk
For carrying out signal transmission with the RRU device, it is additionally operable to carry out signal transmission with the second light wave multiplexer.
Based on the above technical solutions, the quantity of the website transmitting terminal is no less than the second light wave multiplexer
Quantity.
Based on the above technical solutions, when the quantity of the second light wave multiplexer is less than the website transmitting terminal
Quantity when, then the website transmitting terminal of excess amount is left unused, by the remaining website transmitting terminal and second light
Ripple multiplexer matches connection one by one.
Based on the above technical solutions, the first light wave multiplexer is 96 ripple AAWG.
Based on the above technical solutions, the ODN units further include：First photo-coupler；
The line system further includes：
OLP near-end monitoring and protecting devices, the OLP near-ends monitoring and protecting device include：
First photoswitch；
Two the second photo-couplers, two second photo-couplers are equipped with light filter plate, the smooth filter plate respectively
It is connected with multiple photodiode signals；
First photoswitch is grouped for receiving the signal that the BBU pretreatment units transmit, and sends out respectively
Two second photo-couplers are given, is additionally operable to receive the signal that two second photo-couplers transmit, and carries out whole
It closes, is sent to the BBU pretreatment units；
Second photo-coupler is divided into two groups of signals for receiving the signal that first photoswitch transmits, one group
Signal transmission to first photo-coupler, another group of signal transmission gives the corresponding institute of second photo-coupler
Light filter plate is stated, is additionally operable to receive the signal that first photo-coupler transmits, and is divided into two groups of signals, one group of signal passes
First photoswitch is defeated by, another group of signal transmission gives the corresponding light filtering of second photo-coupler
Piece；
First photo-coupler is grouped for receiving the signal that first optical interleaver transmits,
Two second photo-couplers are sent respectively to, is additionally operable to receive the signal that two second photo-couplers transmit, go forward side by side
Row is integrated, and then is transferred to first optical interleaver.
Based on the above technical solutions, second photo-coupler is that splitting ratio is 2:98 photo-coupler, it is described
Second photo-coupler is divided into two groups of signals for receiving the signal that first photoswitch transmits, and 98% signal transmission is given
First photo-coupler, 2% signal transmission give the corresponding smooth filter plate of second photo-coupler, also use
In the signal that reception first photo-coupler transmits, and it is divided into two groups of signals, 98% signal transmission gives first light
Switch, 2% signal transmission give the corresponding smooth filter plate of second photo-coupler.
Based on the above technical solutions, first photo-coupler is that light splitting rate is 50:50 photo-coupler.
Compared with prior art, the advantage of the invention is that：
(1) while the present invention establishes single fiber bi-directional light path, journey that signal when alleviating transmitted in both directions interferes with each other
Degree, reduces the loss of optical link.
(2) extra website transmitting terminal is left unused according to actual demand, is ensureing the invention work by the present invention
Under the premise of making smoothly, appropriate number of website transmitting terminal is selected to be connected with the second light wave multiplexer.
(3) present invention separates optical signal using the second photo-coupler, believes using light filter plate impurity screening light
Number, data foundation is provided for monitoring luminous power and malfunction elimination by photodiode, is provided just for routine work
Profit.
Description of the drawings
Fig. 1 is the structure diagram of C-RAN system single fiber bi-directional optical link line systems in the embodiment of the present invention 1；
Fig. 2 is the structure diagram of C-RAN system single fiber bi-directional optical link line systems in the embodiment of the present invention 2；
Fig. 3 is the structure diagram of C-RAN system single fiber bi-directional optical link line systems in the embodiment of the present invention 3；
Fig. 4 is the structure diagram that OLP near-ends monitor line system in the embodiment of the present invention 3；
In figure：1st, BBU pretreatment units；101st, the first smooth business forwarding disk；102nd, the first light wave multiplexer；2nd, ODN is mono-
Member；201st, the first optical interleaver；202nd, first filter；203rd, second filter；204th, website transmitting terminal；205、
First photo-coupler；3rd, RRU pretreatment units；301st, the second light wave multiplexer；302nd, the second smooth business forwarding disk；4、OLP
Near-end monitoring and protecting device；401st, the first photoswitch；402nd, the second photo-coupler；403rd, light filter plate；404th, two pole of photoelectricity
Pipe.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Embodiment 1
Shown in Figure 1, the embodiment of the present invention provides a kind of single-fiber bidirectional optical line system based on C-RAN systems, until
Include less：BBU pretreatment units 1, BBU pretreatment units 1 are connected with BBU equipment pond signal, for being carried out with BBU equipment pond
Signal transmission；ODN units 2, ODN units 2 include：First optical interleaver 201, the first optical interleaver 201
For signal to be split as strange ripple, even ripple, it is additionally operable to signal integration being transferred to BBU pretreatment units 1；With the first optical comb
The first filter 202 and second filter 203, first filter 202 of 201 signal of shape wave filter connection are used for transmission strange ripple,
Second filter 203 is used for transmission even ripple；Multiple website transmitting terminals 204, the quantity of website transmitting terminal 204 is even number, multiple
Website transmitting terminal 204 is divided into two groups, and one of which website transmitting terminal 204 is connected with 202 signal of first filter, another group
Website transmitting terminal 204 is connected with 203 signal of second filter；Line system further includes：Multiple RRU pretreatment units 3, it is multiple
RRU pretreatment units 3 correspond signal with multiple website transmitting terminals 204 and are connected, and RRU pretreatment units 3 are gone back and RRU device
Signal connects.
When BBU equipment pond sends optical signal, integration is collected first with BBU pretreatment units 1, passes through first
The progress partial wave processing of optical interleaver 201, by strange ripple and the even ripple that 96 wavelength-divisions are each 48, separation foundation is wave band,
And pass through the first optical interleaver 201 and strange ripple, even ripple are respectively allocated to first filter 202, second filter 203,
Optical signal is being distributed to the website transmitting terminal with being each correspondingly connected with by first filter 202, second filter 203
204, it is necessary to which explanation, the quantity for the optical signal that each website transmitting terminal 204 receives is equal, then is sent out by website
Optical signal is sent to corresponding RRU pretreatment units 3 by sending end 204, is finally transferred to RRU device；
When RRU device sends optical signal, then it is transferred to corresponding website first with RRU pretreatment units 3 and sends out
Sending end 204, then integrated optical signal by first filter 202, second filter 203, it is integrated into Qi Bo and even ripple,
And then integrated by the first optical interleaver 201, BBU pretreatment units 1 are then transferred to, are finally transferred to
BBU equipment pond.
It should be noted that the first optical interleaver 201 is in partial wave, it is assumed that there are 96 ripples, then first ripple
For strange ripple, Article 2 ripple is even ripple, and so interval grouping is finally divided into 48 strange ripples, 48 even ripples；
If there are 4 ripples, the 1st, 3 article of ripple is strange ripple, and the 2nd, 4 article of ripple is even ripple.
Wherein, first filter 202, the model of second filter 203 are identical, and concrete model is according to website transmitting terminal 204
Quantity make choice.
In addition, BBU equipment pond includes multiple BBU equipment.
While the present invention establishes single fiber bi-directional light path, degree that signal when alleviating transmitted in both directions interferes with each other, drop
The loss of low optical link.
It should be noted that C-RAN is a kind of novel radio access net framework, C-RAN is specially to be handled based on centralization
(Centralized Processing), collaborative radio (Collaborative Radio) and real-time cloud computing framework
The green wireless access network framework (Clean system) of (Real-time Cloud Infrastructure)；
BBU equipment is baseband processing unit；
RRU device is Remote Radio Unit.
Embodiment 2
Shown in Figure 2, the embodiment of the present invention provides a kind of single-fiber bidirectional optical line system based on C-RAN systems, with
Difference lies in BBU pretreatment units 1 include embodiment 1：Multiple first smooth business forwarding disks 101, the first smooth business forwarding
Disk 101 is used to carry out signal transmission with BBU equipment pond；First light wave multiplexer 102, the first light wave multiplexer 102 respectively with
Multiple first smooth business forwarding disk, 101 signal connections, for integrating the signal that the multiple first smooth business forwarding disks 101 transmit, and
The first optical interleaver 201 is sent to, is additionally operable to receive the signal that the first optical interleaver 201 transmits, and carries out
It splits, is sent to the multiple first smooth business forwarding disks 101；
When BBU equipment pond sends signal to the first smooth business forwarding disk 101, the first smooth business forwarding disk 101 is used to pass
The signal in defeated BBU equipment pond is simultaneously recorded, and the first light wave multiplexer 102 forwards disks 101 for integrating the multiple first smooth business
The signal of transmission, and the first optical interleaver 201 is sent to,
When the first optical interleaver 201 sends signal to the first light wave multiplexer 102, first with the first light
Ripple multiplexer 102 splits signal, and using the first light wave multiplexer 102 is sent respectively to the signal after fractionation more
A first smooth business forwarding disk 101, the signal after final fractionation are transferred to BBU equipment by the multiple first smooth business forwarding disks 101
Pond, the BBU equipment being specifically transferred in BBU equipment pond.
In the present embodiment, RRU pretreatment units 3 include：
Second light wave multiplexer 301, for carrying out signal transmission with corresponding website transmitting terminal 204；
The second smooth business forwarding disk 302 being connected with 301 signal of the second light wave multiplexer, the second smooth business forwarding disk 302
For carrying out signal transmission with RRU device, it is additionally operable to carry out signal transmission with the second light wave multiplexer 301.
When RRU device needs to send signal to RRU pretreatment units 3, disk 302 is forwarded by the second smooth business first
Receive the signal of RRU device, and be transferred to the second light wave multiplexer 301, during transmission, can have to signal
Effect monitoring is finally transmitted a signal to the website transmitting terminal 204 of corresponding connection by the second light wave multiplexer 301；
When website transmitting terminal 204 sends signal to RRU pretreatment units 3, first with the second light wave multiplexer 301
The strange ripple or even ripple that treatment station transmitting terminal 204 is sent, by business ripple therein and monitoring wavelength-division from respectively by the
Two smooth business forwarding disks 302 transmit, and are eventually sent to RRU device.
In the present embodiment, the quantity of website transmitting terminal 204 is no less than the quantity of the second light wave multiplexer 301；
So as to ensure that each second light wave multiplexer 301 has the website transmitting terminal 204 of corresponding signal connection.
Then will be more when the quantity of the second light wave multiplexer 301 is less than the quantity of website transmitting terminal 204 in the present embodiment
The website transmitting terminal 204 of remainder amount is idle, by remaining 204 and second light wave multiplexer 301 of the website transmitting terminal company of pairing one by one
It connects；
According to actual demand, extra website transmitting terminal 204 is left unused, is ensureing that the invention work is smooth
On the premise of, appropriate number of website transmitting terminal 204 is selected to be connected with the second light wave multiplexer 301.
In the present embodiment, the first light wave multiplexer 102 is 96 ripple AAWG；
List stands Maximum Contact ability as 10 business ripples and an OSC ripple, the ripple for being used for midfeather along with 6,
Sum is (10+1) * 2*4+6=94, it is therefore desirable to 96 ripple AAWG, so as to meet maximum traffic demand.
In the present embodiment, signal is divided into Qi Bo and even ripple by the first optical interleaver 201 according to wave band, and wave band is
Odd number is strange ripple, and wave band is that even number is even ripple.
Wherein, the first smooth business forwarding disk 101, the second smooth business forwarding disk 302 have signal transfer functions, and can
The transmission work of itself is recorded.
Embodiment 3
Referring to shown in Fig. 3,4, the embodiment of the present invention provides a kind of single-fiber bidirectional optical line system based on C-RAN systems,
Difference lies in line system further includes with embodiment 1,2：OLP near-end monitoring and protectings device 4, OLP near-ends monitoring and protecting dress
Putting 4 includes：First photoswitch 401；Two the second photo-couplers 402, two the second photo-couplers 402 are equipped with light filter respectively
Wave plate 403, light filter plate 403 are connected with multiple 404 signals of photodiode；First photo-coupler 205；
First photoswitch 401 is grouped for receiving the signal that BBU pretreatment units 1 transmit, and is sent respectively to
Two the second photo-couplers 402 are additionally operable to receive the signal that two the second photo-couplers 402 transmit, and are integrated, and send
To BBU pretreatment units 1；
Second photo-coupler 402 is divided into two groups of signals for receiving the signal that the first photoswitch 401 transmits, one group
Signal transmission gives the first photo-coupler 205, and another group of signal transmission gives the 402 corresponding light filtering of the second photo-coupler
Piece 403 is additionally operable to receive the signal that transmits of the first photo-coupler 205, and is divided into two groups of signals, and one group of signal transmission is to the
One photoswitch 401, another group of signal transmission give 402 corresponding smooth filter plate 403 of the second photo-coupler；
First photo-coupler 205 is grouped for receiving the signal that the first optical interleaver 201 transmits, point
Two the second photo-couplers 402 are not sent to, are additionally operable to receive the signal that two the second photo-couplers 402 transmit, and are carried out whole
It closes, and then is transferred to the first optical interleaver 201.
First photo-coupler 205 is that light splitting rate is 50:Received signal is divided into two or incited somebody to action by 50 photo-coupler
Two signal integrations are one.
OLP near-end monitoring and protectings device 4 is mainly used for being detected the power of signal, since the present invention uses single fiber
BBU equipment pond can be existed simultaneously in bidirectional technique, i.e. an optical fiber and optical signal that RRU device is sent；
When RRU device sends optical signal, optical signal transmission is to OLP near-end monitoring and protectings device 4, first with second
Optical signal is divided into two groups by photo-coupler 402, is respectively separated optical signal by the second photo-coupler 402,98% light letter
Number being sent to the first photoswitch 401 continues to integrate and is transferred to BBU pretreatment units 1, and 2% optical signal then utilizes
Light filter plate 403 is filtered, and the signal that BBU equipment pond and RRU device are sent is optical signal, therefore passes through light again
Optical signal is switched to electric signal by electric diode 404, thus the power of the electrical signal detection optical signal obtained using conversion, and be
Check that failure provides data foundation, to further determine whether that there are failures.
The present invention separates optical signal using the second photo-coupler 402, is utilizing 403 impurity screening of light filter plate
Optical signal provides data foundation for monitoring luminous power and malfunction elimination by photodiode 404, is carried for routine work
Facility is supplied.
In the present embodiment, the second photo-coupler 402 is that splitting ratio is 2:98 photo-coupler, the second photo-coupler 402 are used
In the signal that the first photoswitch 401 of reception transmits, and it is divided into two groups of signals, 98% signal transmission gives the first photo-coupler
205,2% signal transmission gives 402 corresponding smooth filter plate 403 of the second photo-coupler, is additionally operable to receive the first optical coupling
The signal that device 205 transmits, and it is divided into two groups of signals, 98% signal transmission is to the first photoswitch 401,2% signal transmission
Give 402 corresponding smooth filter plate 403 of the second photo-coupler.
When needing to check the power of signal, it is only necessary to since photodiode 404 can convert optical signal into telecommunications
Number, therefore detect the power for the electric signal that conversion obtains；
In addition, when power occurs abnormal, staff is alternatively arranged as the data foundation of malfunction elimination.
The present invention separates optical signal by the second photo-coupler, is utilizing light filter plate impurity screening optical signal,
Data foundation is provided for monitoring luminous power and malfunction elimination by photodiode, is provided convenience for routine work.
The present invention is not only limited to above-mentioned preferred forms, anyone can draw other under the enlightenment of the present invention
Various forms of products, however, make any variation in its shape or structure, it is every with same or similar seemingly with the present invention
Technical solution, within its protection domain.
Claims (9)
1. a kind of single-fiber bidirectional optical line system based on C-RAN systems, which is characterized in that the line system includes at least：
- BBU pretreatment units (1), the BBU pretreatment units (1) are connected with BBU equipment pond signal, for being set with the BBU
Standby pond carries out signal transmission；
- ODN units (2), the ODN units (2) include：
-- the first optical interleaver (201), first optical interleaver (201) are used to signal being split as very
Ripple, even ripple, are additionally operable to signal integration being transferred to the BBU pretreatment units (1)；
-- the first filter (202) and second filter being connected with the first optical interleaver (201) signal
(203), the first filter (202) is used for transmission the strange ripple, and the second filter (203) is used for transmission the idol
Ripple；
-- multiple website transmitting terminals (204), the quantity of the website transmitting terminal (204) are even number, multiple website transmitting terminals
(204) two groups are divided into, website transmitting terminal (204) described in one of which is connected with the first filter (202) signal, another
The group website transmitting terminal (204) is connected with the second filter (203) signal；
The line system further includes：
- multiple RRU pretreatment units (3), multiple RRU pretreatment units (3) and multiple website transmitting terminals (204) one
A pair of of induction signal connection, the RRU pretreatment units (3) are also connected with RRU device signal.
2. a kind of single-fiber bidirectional optical line system based on C-RAN systems as described in claim 1, which is characterized in that described
BBU pretreatment units (1) include：
Multiple first smooth business forwarding disks (101), the first smooth business forwarding disk (101) be used for the BBU equipment pond into
Row signal transmission；
First light wave multiplexer (102), the first light wave multiplexer (102) forward disks with multiple first smooth business respectively
(101) signal connects, and for integrating the signal that multiple first smooth business forwarding disks (101) are transmitted, and is sent to described the
One optical interleaver (201) is additionally operable to receive the signal that first optical interleaver (201) is transmitted, and carries out
It splits, is sent to multiple first smooth business forwarding disks (101).
3. a kind of single-fiber bidirectional optical line system based on C-RAN systems as described in claim 1, which is characterized in that described
RRU pretreatment units (3) include：
Second light wave multiplexer (301), for carrying out signal transmission with the corresponding website transmitting terminal (204)；
The second smooth business forwarding disk (302) being connected with the second light wave multiplexer (301) signal, the second smooth business turn
(302) are offered for carrying out signal transmission with the RRU device, are additionally operable to carry out letter with the second light wave multiplexer (301)
Number transmission.
4. a kind of single-fiber bidirectional optical line system based on C-RAN systems as claimed in claim 3, which is characterized in that described
The quantity of website transmitting terminal (204) is no less than the quantity of the second light wave multiplexer (301).
5. a kind of single-fiber bidirectional optical line system based on C-RAN systems as claimed in claim 4, which is characterized in that work as institute
State the second light wave multiplexer (301) quantity be less than the website transmitting terminal (204) quantity when, then will be described in excess amount
Website transmitting terminal (204) is idle, by the remaining website transmitting terminal (204) with the second light wave multiplexer (301) one by one
Pairing connection.
6. a kind of single-fiber bidirectional optical line system based on C-RAN systems as claimed in claim 2, which is characterized in that described
First light wave multiplexer (102) is 96 ripple AAWG.
7. a kind of single-fiber bidirectional optical line system based on C-RAN systems as described in claim 1, which is characterized in that described
ODN units (2) further include：First photo-coupler (205)；The line system further includes：
OLP near-end monitoring and protecting devices (4), the OLP near-ends monitoring and protecting device (4) include：
First photoswitch (401)；
Two the second photo-couplers (402), two second photo-couplers (402) are equipped with light filter plate (403), institute respectively
Light filter plate (403) is stated to be connected with multiple photodiodes (404) signal；
First photoswitch (401) is grouped for receiving the signal that the BBU pretreatment units (1) are transmitted, respectively
Two second photo-couplers (402) are sent to, are additionally operable to receive the letter that two second photo-couplers (402) are transmitted
Number, and integrated, it is sent to the BBU pretreatment units (1)；
Second photo-coupler (402) is divided into two groups of letters for receiving the signal that first photoswitch (401) is transmitted
Number, for one group of signal transmission to first photo-coupler (205), another group of signal transmission gives second photo-coupler
(402) the corresponding smooth filter plate (403) is additionally operable to receive the signal that first photo-coupler (205) is transmitted, and divides
For two groups of signals, for one group of signal transmission to first photoswitch (401), another group of signal transmission gives second light
The corresponding smooth filter plate (403) of coupler (402)；
First photo-coupler (205) carries out for receiving the signal that first optical interleaver (201) is transmitted
Grouping, is sent respectively to two second photo-couplers (402), is additionally operable to receive two second photo-couplers (402)
The signal transmitted, and integrated, and then it is transferred to first optical interleaver (201).
8. a kind of single-fiber bidirectional optical line system based on C-RAN systems as claimed in claim 7, it is characterised in that：It is described
Second photo-coupler (402) is that splitting ratio is 2:98 photo-coupler, second photo-coupler (402) is for receiving described the
The signal that one photoswitch (401) transmits, and it is divided into two groups of signals, 98% signal transmission gives first photo-coupler (205),
2% signal transmission gives the corresponding smooth filter plate (403) of second photo-coupler (402), is additionally operable to receive institute
The signal that the first photo-coupler (205) transmits is stated, and is divided into two groups of signals, 98% signal transmission gives first photoswitch
(401), 2% signal transmission gives the corresponding smooth filter plate (403) of second photo-coupler (402).
9. a kind of single-fiber bidirectional optical line system based on C-RAN systems as claimed in claim 7, it is characterised in that：
First photo-coupler (205) is that light splitting rate is 50:50 photo-coupler.
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