CN104243082B - Wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network system and method for defencive function - Google Patents
Wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network system and method for defencive function Download PDFInfo
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- CN104243082B CN104243082B CN201410460002.9A CN201410460002A CN104243082B CN 104243082 B CN104243082 B CN 104243082B CN 201410460002 A CN201410460002 A CN 201410460002A CN 104243082 B CN104243082 B CN 104243082B
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Abstract
The transmission of broadcasting service and the extensive optical access network system and transmission method of defencive function are realized the present invention relates to a kind of wavelength-division multiplex optical access network network.The system is：1 central office CO connects 1 far-end node RN by M+1 roots optical fiber and forms tree network, is connected in far-end node RN by profile fiber with optical network unit ONU.The design at CO ends and RN ends, realize the high efficiency of transmission of broadcast singal；The shared protection that the structure design of RN ends photoswitch and ONU end photoswitch realizes to feeder fiber makes system reach equilibrium between cost and performance.The selection that the present invention passes through the optional optical device in part, it is possible to achieve the flexible selection to transmission range and scale, make system be adapted to different network needs.
Description
Technical field
The present invention relates to optical communication field, is specifically related to a kind of wavelength-division multiplex optical access network network (OAN) and realizes broadcast service
Business transmission and the extensive optical access network system and method for defencive function.
Background technology
Wavelength-division multiplex technique (WDM) technology can in the case where not changing physical basis equipment upgrade bandwidth, significantly
The transmission capacity of network is lifted, virtual point-to-point transmission is realized, will not share information between each user, there is natural peace
Quan Xing.Also just because of in the introducing of WDM technology, in optical access network, the overall transmission capacity of network is compared traditional time-division and answered
Greatly improved with technology (TDM), therefore people are for the reliability requirement also more and more higher of network, and network failure can be provided
Self-healing and protection are into a current big study hotspot.Simultaneously as the characteristic of the virtual point-to-point transmission of WDM technology, makes it simultaneously
Effective broadcasting service transmission can not be directly realized by.And in current access network under the main trend of the integration of three networks, for broadcast service
Efficiently being carried in access network for business is particularly important.Furthermore in order to promote Metropolitan Area Network (MAN) to be possibly realized with merging for access network,
Research for long range, Large Copacity access network is increasingly subject to the attention of people.The present invention is carried out to the architectural framework of system
Rational layout, system not only can efficiently carry broadcasting service, realization carries out shared protection to feeder fiber, while can expired
Foot length distance, large-scale access require, and system can also reach perfect condition between cost and performance.
The content of the invention
A kind of the defects of it is an object of the invention to exist for prior art, there is provided wavelength-division multiplex optical access network
(WDM-OAN) the extensive optical access network system and method for broadcast traffic transmissions and defencive function are realized, can be effectively in WDM-
The efficient carrying of broadcasting service and the shared protection to feeder fiber are realized in OAN, while the system is also supported to advise over long distances, greatly
The transmission of mould.
To reach above-mentioned purpose, core concept of the invention is：Multiple optical line terminal OLTs are placed in the CO of central office to enter
The Corticofugal Modulation of Somatosensory and uplink receiving of row multi-wavelength, while dispose a specific wavelength emitter to be used to send broadcasting service.In distal end
A kind of new structure configuration mode is used at node RN, by this new distant-end node RN frame mode, realizes broadcast letter
The shared protection of feeder fiber between modulation and central office CO and far-end node RN number on upper line light source.When being loaded with broadcast singal
Upper line light source when transmitting to each group optical network unit ONU, be divided into two parts carry out respectively the reception of broadcast singal with it is up
The modulation of signal.
Conceived according to foregoing invention, the present invention uses following scheme：
A kind of wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network system of defencive function
System, 1 far-end node RN is connected by M+1 roots single-mode fiber by central office CO, far-end node RN is connected to M by profile fiber
Individual optical network unit group, each optical network unit group include N number of optical network unit ONU；It is characterized in that：
1) the central office CO described in is by M optical line terminal OLT, the broadcast signal transmission machine of specific wavelength, one
Individual M+1 × M+1 photoswitch and first erbium-doped fiber amplifier form.In the olt, N number of emitter is connected to one
One 1 × N array waveguide optical grating AWG, one 1 × N array waveguide optical grating AWG output are connected to first Optical circulator, the
The output of one Optical circulator is connected to optical branching device, and an output of the first optical branching device is connected to optical monitoring signal instrument, another
End is connected to M+1 × M+1 photoswitch, meanwhile, the output of broadcast signal transmission machine is also connected to M+1 × M+1 photoswitch, M+
M+1 output of 1 × M+1 photoswitch is connected to far-end node RN by M roots feeder fiber and a sharing fiber；
2) in the far-end node RN described in, the M roots feeder fiber is respectively connecting to M REPEATER repeater, each
Feeder fiber is connected to the 5th optical branching device in individual REPEATER repeaters, and an output of the first optical branching device is connected to
Optical monitoring signal instrument, the other end are connected to 1 × 2 photoswitch, an output of 1 × 2 photoswitch be connected to one it is first thick
Wavelength division multiplexer, with one after one of first Coarse Wave Division Multiplexer output connection, one the second erbium doped optical fibre light amplifier EDFA
Individual 3rd Coarse Wave Division Multiplexer is connected, another output one the 3rd Er-doped fiber light amplification of connection of the first Coarse Wave Division Multiplexer
Be connected after device EDFA and second Optical circulator with second Coarse Wave Division Multiplexer, the output of the second Coarse Wave Division Multiplexer with
One 41 × N array waveguide optical grating AWG connects, and 41 × N array waveguide optical grating AWG N number of output passes through N roots point respectively
Cloth optical fiber is connected with optical network unit OUN；Sharing fiber is connected with erbium doped optical fibre light amplifier EDFA, and its output passes through one
It is divided into two-way after 3rd Coarse Wave Division Multiplexer, exports and one 1 all the way：M the 3rd optical branching device connection, its M road output difference
1 × 2 photoswitch being connected in M REPEATER repeater, and the output of the another way of the 3rd Coarse Wave Division Multiplexer is connected to
Broadcast signal receiver RX, it is exported passes through 31 × N array waveguide optical grating with N number of distributed feedback laser DFB
AWG output is admitted to electroabsorption modulator EAM, electroabsorption modulator EAM output and a 5th Er-doped fiber light together
Its output passes through one 1 after amplifier EDFA is connected：After M the 3rd optical branching device, the output of M roads is respectively connecting to M
The second Optical circulator in REPEATER repeaters；
3) M optical network unit OUN group described in respectively by M REPEATER repeater in far-end node RN each via
N number of optical network unit OUN compositions of N roots profile fiber connection；In each optical network unit OUN, including one and profile fiber
Connected the 4th Coarse Wave Division Multiplexer, a downstream signal reception machine, a broadcast signal receiver, one 1:The of 2
Four optical branching devices and a reflective semiconductor optical amplifier RSOA composition；The output all the way of 4th Coarse Wave Division Multiplexer directly connects
Downstream signal reception machine is connected to, the output of its another way passes through one 1:2 the 4th optical branching device is divided into two-way and is respectively connecting to one
Individual broadcast signal receiver and a reflective semiconductor optical amplifier RSOA.
A kind of wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network of defencive function
Transmission method, realize that the transmission of broadcasting service and the extensive light of defencive function connect using above-mentioned Wave division multiplexing passive optical network
The system of networking is operated, and its transmission method difference is as follows：
1) for the transmission of broadcasting service, a specific proprietary ripple is used in the emitter in the CO of central office first
Long λBFor the transmission of broadcast singal, after a first erbium doped optical fibre light amplifier EDFA carries out optical signal amplification, pass through
Sharing fiber is sent into after one M+1 × M+1 photoswitch, and is transferred to far-end node RN.In far-end node RN, light is shared
Broadcast singal in fibre first passes around the 4th erbium doped optical fibre light amplifier EDFA and carried out after signal amplification by one the 3rd
Coarse Wave Division Multiplexer is by wavelength in λBOn broadcast optical signal be sent into receiver, by receiver by wavelength in λBOn broadcast light
Signal is changed into electric signal.N number of distributed feedback laser DFB in far-end node RN is produced N number of non-modulated simultaneously
Up light source lambda '1,λ'2…λ'N-1,λ'N, electric absorption tune is delivered to after carrying out wavelength multiplexing by a 1*N array waveguide gratings AWG
Device EAM (32) processed.In electroabsorption modulator EAM, by being loaded with the electric signal of broadcasting service caused by receiver to up light
Source λ '1,λ'2…λ'N-1,λ'NCarry out optical signal modulation so that up light source lambda '1,λ'2…λ'N-1,λ'NIn each wavelength be loaded with
Broadcast singal.Be loaded with broadcast singal up light source lambda '1,λ'2…λ'N-1,λ'NPass through the 5th erbium doped optical fibre light amplifier
After EDFA carries out optical signal amplification, pass through one 1：M the 3rd optical branching device is divided into behind M roads to be delivered in M REPEATER respectively
After the second Optical circulator in device, the output of the second Optical circulator after second Coarse Wave Division Multiplexer by delivering to one the 4th
1*N array waveguide gratings AWG demultiplex, be loaded with broadcast singal up light source lambda '1,λ'2…λ'N-1,λ'NThen pass through N roots point
Cloth optical fiber is sent to N number of optical network unit ONU.The λ ' in optical network unit ONUn(1≤n≤N) passes through a 4th thick wavelength-division
Multiplexer and one 1:2 the 4th optical branching device is divided into two parts, and a portion is sent into receiver and is used for broadcasting service
Receive, another part is sent into the modulation that reflective semiconductor optical amplifier RSOA is used for upward signal.
2) for the up-downgoing business in network, in the normal mode, the M optical link in central office CO (1) is whole
End OLT be each responsible for in an optical network unit group N number of optical network unit carry out downlink information transmission with it is up
The reception of signal.In the terminal OLT of road, N number of emitter produces the optical signal λ that N roads are each loaded with downlink information1,λ2…λN-1,
λN, N roads optical signal after a first 1*N array waveguide grating AWG wavelength multiplexing by passing through the first Optical circulator, M+1 afterwards
Far-end node RN is delivered to by feeder fiber after × M+1 photoswitch.In far-end node RN, M roots feeder fiber will each carry
There is the optical signal λ of downlink information1,λ2…λN-1,λNIt is respectively connected in M REPEATER repeater.In REPEATER repeaters,
It is loaded with the optical signal λ of downlink information1,λ2…λN-1,λNBy being passed through after the photoswitch of one 1 × 2, second Coarse Wave Division Multiplexer
Cross a second erbium doped optical fibre light amplifier EDFA and carry out optical signal amplification, then with being loaded with extensively in the second Coarse Wave Division Multiplexer
Broadcast signal up light source lambda '1,λ'2…λ'N-1,λ'NWavelength multiplexing, solved afterwards by a 2nd 1*N array waveguide gratings AWG
Multiplexing, the output of its N road will be loaded with the optical signal λ of downlink information by N roots profile fibernWith the upper line light source for being loaded with broadcast singal
λ'n(1≤n≤N) transmits to N number of optical network unit ONU together.In optical network unit ONU, pass through the 4th Coarse Wave Division Multiplexer
Demultiplexing, it is loaded with the optical signal λ of downlink informationnThe reception of downstream signal is carried out by receiver, and is loaded with the upper of broadcast singal
Line light source λ 'nPass through one 1:2 the 4th optical branching device is divided into two parts, and a portion feeding reflective semiconductor light is put
Big device RSOA is used for the modulation of upward signal, and another part is sent into the reception that receiver is used for broadcasting service.Partly led reflective
Body image intensifer RSOA carries out the λ ' after upward signal modulationnPass through 1:2 the 4th optical branching device, the 4th Coarse Wave Division Multiplexer and
The REPEATER repeaters that profile fiber returns in far-end node RN again.In REPEATER repeaters, pass through one first
Individual 4th 1*N array waveguide grating AWG wavelength multiplexings, subsequent upward signal λ '1,λ'2…λ'N-1,λ'NAnswered by the second thick wavelength-division
Amplified with after device, the second Optical circulator by one the 3rd erbium doped optical fibre light amplifier EDFA, through the second Coarse Wave Division Multiplexer after
With 1 × 2 the optical line terminal OLT that is returned to by the photoswitch of feeder fiber and M+1 × M+1 in the CO of central office of photoswitch.
In optical line terminal OLT, upward signal λ '1,λ'2…λ'N-1,λ'NThrough the first Optical circulator in a 4th 1*N Waveguide array
After grating AWG demultiplexings, N roads upward signal λ '1,λ'2…λ'N-1,λ'NReceived respectively by N number of receiver.
Above-mentioned wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network of defencive function
Method, it is characterised in that：When any one failure in M root feeder fibers, 1 can be carried out by sharing fiber:M's is shared
Protection.The optical signal monitor instrument in optical line terminal OLT in the CO of central office detects uplink optical signal when an error occurs
Change, control M+1 × M+1 photoswitch make network enter protected mode.Originally the uplink and downlink signals in fault feeder optical fiber
It is loaded onto on sharing fiber by the switching of M+1 × M+1 photoswitch and is transmitted together with broadcast singal.Simultaneously in far-end node RN
The optical signal monitor instrument in REPEATER repeaters that fault feeder optical fiber is connected detects that downlink optical signal changes, control 1
× 2 photoswitch makes it into protected mode.Consequently, it is possible to it is loaded with the light letter of downlink information in the transmission of down direction sharing fiber
Number λ1,λ2…λN-1,λNWith the λ for being loaded with broadcast optical signalBTo far-end node RN.In far-end node RN, the light letter of downlink information
Number λ1,λ2…λN-1,λNWith the λ for being loaded with broadcast optical signalBAmplified first by one the 4th erbium doped optical fibre light amplifier EDFA, then
Demultiplexed in the 3rd Coarse Wave Division Multiplexer, be loaded with the λ of broadcast optical signalBFeeding receiver identical with normal mode, and under
The optical signal λ of row information1,λ2…λN-1,λNPass through 1:The optical branching devices of M second deliver to respectively M REPEATER repeater 1 ×
2 photoswitch.1 × 2 photoswitch in the REPEATER repeaters that fault feeder optical fiber is connected believes the light of downlink information
Number λ1,λ2…λN-1,λNDeliver to the second Coarse Wave Division Multiplexer then carry out downstream signal reception identical with normal mode, while will be upper
Row signal λ '1,λ'2…λ'N-1,λ'NPass through 1:The optical branching devices of M second and the 3rd Coarse Wave Division Multiplexer feeding sharing fiber, and its
Remaining REPEATER repeaters then unaffected normal work.Up direction, upward signal λ ' in sharing fiber1,λ'2…λ'N-1,
λ'NDelivered to by M+1 × M+1 photoswitch with realizing upward signal in the optical line terminal OLT corresponding to fault feeder optical fiber
Reception.
Above-mentioned wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network of defencive function
Method, itself another feature is that：Network size can be flexibly selected according to actual conditions.N number of upgoing wave is shared in whole network
Long, N number of downstream wavelength, a broadcasting wave length, a sharing fiber and M root feeder fibers, so whole network can carry altogether
Up-downgoing wavelength channel is transmitted for N × M., can when needing to provide large-scale broadband inserting service for a large number of users
To be realized by increasing M numerical value.The four, the 5th erbium doped optical fibre light amplifier EDFA in far-end node RN are put as optional
Big device, for ensureing, when M is larger, enough power to be provided for data traffic transmission.When the width for needing network to provide long range
During band access, optional first erbium doped optical fibre light amplifier EDFA can be added in the CO of central office, increases the biography of network with this
Defeated distance.
Compared with prior art, it is of the invention that there is following obvious prominent substantive distinguishing features and notable technology to enter
Step：(1) 1 can be provided to feeder fiber part:M shared protection, particularly can be significantly in the case where long range is transmitted
Reduce and rise because improving network cost caused by network reliability；(2) broadcast traffic transmissions can be effectively supported, and
Due to use only specific wavelength load broadcast signal on feeder fiber, the smooth liter of some particular networks can be supported
Level.(3) by the selection to optional device, network size and transmission range can flexibly be selected according to actual conditions.
Brief description of the drawings
Fig. 1 is that one embodiment of the invention demonstrate,proves transmission and defencive function that wavelength-division multiplex optical access network network realizes broadcasting service
Extensive optical access network system schematic.
Fig. 2 is the schematic diagram of wavelength-division multiplex optical access network network central office CO internal structures.
Fig. 3 is the schematic diagram of wavelength-division multiplex optical access network network far-end node RN internal structures.
Fig. 4 is the schematic diagram of central office CO internal structures under wavelength-division multiplex optical access network network protected mode.
Fig. 5 is the schematic diagram of far-end node RN internal structures under wavelength-division multiplex optical access network network protected mode.
Embodiment
Details are as follows for the preferred embodiments of the present invention combination accompanying drawing：
Embodiment one：
Referring to Fig. 1, this wavelength-division multiplex optical access network network realizes that the transmission of broadcasting service and the extensive light of defencive function connect
Networking system, 1 far-end node RN (2) is connected by M+1 roots single-mode fiber by central office CO (1), far-end node RN (2) passes through
Profile fiber is connected to M optical network unit group (3), and each optical network unit group includes N number of optical network unit ONU (4)；
Referring to Fig. 2, described central office CO (1) includes broadcast signal transmission machine (8), a M optical line terminal OLT
(7), M+1 × M+1 photoswitch (9) and optional first erbium-doped optical fiber amplifier EDFA (10), wherein each light
Include N number of optical signal transmitter (11), N number of optical signal receiver (12), first, second 2 1*N battle arrays in road terminal OLT (7)
Train wave guide grating AWG (13,17), an Optical circulator (15), an optical signal monitor instrument (14), first optical branching device
(16).In OLT (7), N number of emitter (11) is connected to one 1 × N array waveguide optical grating AWG (13), one 1 × N battle arrays
Train wave guide grating AWG (13) output is connected to first Optical circulator (15), the output connection of the first Optical circulator (15)
To the first optical branching device (16), an output of the first optical branching device (16) is connected to optical monitoring signal instrument (14), and the other end connects
M+1 × M+1 photoswitch (9) is connected to, meanwhile, the output of broadcast signal transmission machine (8) is also connected to M+1 × M+1 photoswitch
(9), M+1 output of M+1 × M+1 photoswitch (9) is connected to far by M roots feeder fiber (5) and a sharing fiber (6)
Leaf RN (2)；
Referring to Fig. 3, the far-end node RN (2) includes M REPEATER repeater (18), the 3rd CWDM
Device (29), a broadcast optical signal receiver (31), an electroabsorption modulator EAM (32), a 3rd 1*N Waveguide array light
Grid AWG (33), N number of distributed feedback laser DFB (34), second, third two optical branching device (30,35) and the four, the 5th
Two optional erbium-doped optical fiber amplifier EDFA (28,36) compositions, and M REPEATER repeater (18) is believed by a light respectively
Number monitor (19), an optical branching device (21), the photoswitch (20) of one 1 × 2, first, second two Coarse Wave Division Multiplexers
(22,26), second, third two erbium-doped optical fiber amplifier EDFA (23,24), second Optical circulator (25) and one the 4th
1*N array waveguide gratings AWG (27) is formed.In far-end node RN (2), M roots feeder fiber (5) is respectively connecting to M
REPEATER repeaters (18), feeder fiber (5) is connected to optical branching device (21) in each REPEATER repeaters (18), the
One of one optical branching device (16) output is connected to optical monitoring signal instrument (19), and the other end is connected to 1 × 2 photoswitch (20), and 1
One output of × 2 photoswitch (20) is connected to the first Coarse Wave Division Multiplexer (22), first Coarse Wave Division Multiplexer (22)
One output connection, one the second erbium doped optical fibre light amplifier EDFA (24) is connected with the second Coarse Wave Division Multiplexer (26) afterwards, and first
Another output one the 3rd erbium doped optical fibre light amplifier EDFA (23) of connection of Coarse Wave Division Multiplexer (22) and the second optical loop
Device (25) is connected with the second Coarse Wave Division Multiplexer (26) afterwards, the output of the second Coarse Wave Division Multiplexer (26) and a 2nd 1*N battle array
Train wave guide grating AWG (27) connects, and the 4th 1*N array waveguide gratings AWG (27) N number of output passes through N root profile fibers respectively
(42) it is connected with optical network unit OUN (4)；Sharing fiber (6) is connected with the 4th erbium doped optical fibre light amplifier EDFA (28), and its
Output is divided into two-way after passing through the 3rd Coarse Wave Division Multiplexer (29), exports and one 1 all the way:M the second optical branching device (30) is even
Connect, the output of its M road is respectively connecting to 1 × 2 photoswitch (20) in M REPEATER repeater (18), and the 3rd thick wavelength-division
The another way output of multiplexer (29) is connected to broadcast signal receiver RX (31), and it is exported and N number of distributed feedback laser
DFB (34) is admitted to electroabsorption modulator EAM (32) together by a 3rd 1*N array waveguide gratings AWG (33) output,
Its output passes through after electroabsorption modulator EAM (32) output is connected with a 5th erbium doped optical fibre light amplifier EDFA (36)
One 1:After M the 3rd optical branching device (35), the output of M roads is respectively connecting to the second light in M REPEATER repeater (18)
Circulator (25).
Referring to Fig. 3, described optical network unit group is made up of N number of ONU, and each ONU includes a Coarse Wave Division Multiplexer
(37), an optical branching device (40), a reflective semiconductor optical amplifier RSOA (41) and two optical signal receivers (38,
39) form.The output all the way of Coarse Wave Division Multiplexer (37) is connected directly to downstream signal reception machine (38), and the output of its another way is logical
Cross one 1:2 the 4th optical branching device (40) is divided into two-way and is respectively connecting to a broadcast signal receiver (39) and a reflection
Formula semiconductor optical amplifier RSOA (41).
Embodiment two：
Referring to Fig. 1, Fig. 2, system shown in Figure 3, transmission and the guarantor of system wavelength-division multiplex optical access network network broadcasting service are realized
The specific method of the extensive optical access network of protective function is：Transmission for broadcasting service, first in central office CO (1)
Emitter (8) be used for the transmission of broadcast singal using specific proprietary wavelength, put by a first Er-doped fiber light
After big device EDFA (10) carries out optical signal amplification, sharing fiber (6) is sent into by M+1 × M+1 photoswitch (9) afterwards, and
It is transferred to far-end node RN (2).In far-end node RN (2), the broadcast singal in sharing fiber (6) first passes around one
Four erbium doped optical fibre light amplifier EDFA (28) are existed wavelength by the 3rd Coarse Wave Division Multiplexer (29) after carrying out signal amplification
On broadcast optical signal be sent into receiver (31), wavelength is changed into by telecommunications in upper broadcast optical signal by receiver (31)
Number.N number of distributed feedback laser DFB (34) in far-end node RN (2) produces N number of non-modulated up light simultaneously
Source, electroabsorption modulator EAM (32) is delivered to after carrying out wavelength multiplexing by one the 3rd 1*N array waveguide gratings AWG (33).In electricity
In Absorption modulation device EAM (32), light is carried out to upper line light source by the electric signal that broadcasting service is loaded with caused by receiver (31)
Signal modulation so that each wavelength is loaded with broadcast singal in upper line light source.The upper line light source of broadcast singal is loaded with by one
After 5th erbium doped optical fibre light amplifier EDFA (36) carries out optical signal amplification, pass through one 1:M the second optical branching device (35) point
The second Optical circulator (25) delivered to respectively after into M roads in M REPEATER repeater (18), the second Optical circulator (25) it is defeated
Go out by delivering to the 4th 1*N array waveguide gratings AWG (27) demultiplexing after second Coarse Wave Division Multiplexer (26), be loaded with
The upper line light source of broadcast singal is then sent to N number of optical network unit ONU (4) by N roots profile fiber (42).In optical-fiber network list
λ ' in first ONU (4)n(1≤n≤N) passes through the 4th Coarse Wave Division Multiplexer (37) and one 1:2 the 4th optical branching device (40)
It is divided into two parts, a portion is sent into the reception that receiver (39) is used for broadcasting service, and another part is sent into reflective half
Conductor image intensifer RSOA (41) is used for the modulation of upward signal.For the up-downgoing business in network, in the normal mode, position
M optical line terminal OLT (7) in central office CO (1) is each responsible for being used for N number of in an optical network unit group (3)
Optical network unit (4) carries out the transmission of downlink information and the reception of upward signal.In road terminal OLT (7), N number of emitter (1)
Produce the optical signal λ that N roads are each loaded with downlink information1,λ2…λN-1,λN, afterwards N roads optical signal pass through a 1*N Waveguide array
After grating AWG (13) wavelength multiplexing by the first Optical circulator (15), M+1 × M+1 photoswitch (9) after pass through feeder fiber
(5) far-end node RN (2) is delivered to.In far-end node RN (2), M roots feeder fiber will each be loaded with the optical signal of downlink information
λ1,λ2…λN-1,λNIt is respectively connected in M REPEATER repeater (18).In REPEATER repeaters (18), descending letter is loaded with
The optical signal λ of breath1,λ2…λN-1,λNBy after the photoswitch of one 1 × 2 (20), first Coarse Wave Division Multiplexer (22) by
One the second erbium doped optical fibre light amplifier EDFA (24) carries out optical signal amplification, then in the second Coarse Wave Division Multiplexer (26) with
Be loaded with broadcast singal up light source lambda '1,λ'2…λ'N-1,λ'NWavelength multiplexing, pass through one the 4th 1*N array waveguide gratings afterwards
AWG (27) is demultiplexed, and the output of its N road by the optical signal for being loaded with downlink information and is loaded with broadcast letter by N roots profile fiber (42)
Number up light source lambda 'n(1≤n≤N) transmits to N number of optical network unit ONU (4) together.In optical network unit ONU (4), lead to
The 4th Coarse Wave Division Multiplexer (37) demultiplexing is crossed, the optical signal for being loaded with downlink information carries out downstream signal by receiver (38)
Receive, and be loaded with the upper line light source of broadcast singal by one 1:2 the 4th optical branching device (40) is divided into two parts, wherein one
The modulation that reflective semiconductor optical amplifier RSOA (41) is used for upward signal is sent into part, and another part is sent into receiver (39)
Reception for broadcasting service.λ ' after reflective semiconductor optical amplifier RSOA (41) carries out upward signal modulationnPass through
1:2 the 4th optical branching device (40), the 4th Coarse Wave Division Multiplexer (37) and profile fiber (42) returns to far-end node RN again
(2) the REPEATER repeaters (18) in.In REPEATER repeaters (18), pass through a 2nd 1*N Waveguide array first
Grating AWG (27) wavelength multiplexing, subsequent upward signal λ '1,λ'2…λ'N-1,λ'NPass through the second Coarse Wave Division Multiplexer (26), second
Amplified after Optical circulator (25) by one the 3rd erbium doped optical fibre light amplifier EDFA (23), through the first Coarse Wave Division Multiplexer after
(22) returned to 1 × 2 photoswitch (20) by the photoswitch (9) of feeder fiber (5) and M+1 × M+1 in central office CO (1)
Optical line terminal OLT (7).In optical line terminal OLT (7), upward signal λ '1,λ'2…λ'N-1,λ'NThrough Optical circulator
(15) after one the 2nd 1*N array waveguide gratings AWG (17) demultiplexings, N roads upward signal λ '1,λ'2…λ'N-1,λ'NRespectively by N
Individual receiver (12) receives.
Embodiment three：
Referring to Fig. 4, Fig. 5, when any one failure in M roots feeder fiber (5), can be entered by sharing fiber (6)
Row 1:M shared protection.The optical signal monitor instrument being located at when an error occurs in central office CO (1) interior optical line terminal OLT (7)
(14) detect that uplink optical signal changes, control M+1 × M+1 photoswitch (9) makes network enter protected mode.Originally in failure
The switching for the photoswitch (9) that uplink and downlink signals in feeder fiber (5) pass through M+1 × M+1 be loaded onto on sharing fiber (6) with it is wide
Signal is broadcast to transmit together.In the REPEATER repeaters (18) that fault feeder optical fiber (5) is connected in far-end node RN (2) simultaneously
Optical signal monitor instrument (19) detect downlink optical signal change, control 1 × 2 photoswitch (20) make it into protected mode.
Consequently, it is possible to it is loaded with the optical signal λ of downlink information in the transmission of down direction sharing fiber1,λ2…λN-1,λNBelieve with broadcast light is loaded with
Number λBTo far-end node RN (2).In far-end node RN (2), the optical signal λ of downlink information1,λ2…λN-1,λNIt is wide with being loaded with
Broadcast the λ of optical signalBAmplified first by one the 4th erbium doped optical fibre light amplifier EDFA (28), then in the 4th Coarse Wave Division Multiplexer
(29) demultiplexed, be loaded with the λ of broadcast optical signalBFeeding receiver (31) identical with normal mode, and the light of downlink information
Signal λ1,λ2…λN-1,λNPass through 1:The optical branching devices of M second (30) deliver to the 1 × 2 of M REPEATER repeater (18) respectively
Photoswitch (20).1 × 2 photoswitch (20) in the REPEATER repeaters (18) that fault feeder optical fiber (5) is connected will
The optical signal λ of downlink information1,λ2…λN-1,λNDeliver to that the first Coarse Wave Division Multiplexer (22) is then identical with normal mode to be carried out down
Row signal receives, while by upward signal λ '1,λ'2…λ'N-1,λ'NPass through 1:The optical branching devices of M second (30) and the 3rd thick wavelength-division
Multiplexer (29) is sent into sharing fiber (6), and remaining REPEATER repeater (18) then unaffected normal work.Up side
To upward signal λ ' in sharing fiber (6)1,λ'2…λ'N-1,λ'NDelivered to by M+1 × M+1 photoswitch (9) and fault feeder
The reception of upward signal is realized in optical line terminal OLT (7) corresponding to optical fiber (5).
Claims (4)
1. a kind of wavelength-division multiplex optical access network network realizes the transmission of broadcasting service and the extensive optical access network system of defencive function,
1 far-end node RN (2) is connected by M+1 roots single-mode fiber by central office CO (1), far-end node RN (2) passes through profile fiber
M optical network unit group (3) is connected to, each optical network unit group (3) includes N number of optical network unit ONU (4)；Its feature exists
In：
1) the central office CO (1) described in is by the broadcast signal transmission machine of M optical line terminal OLT (7), specific wavelength
(8), one (M+1) × (M+1) photoswitch (9) forms with first erbium-doped fiber amplifier (10)；In OLT (7), N
Individual emitter (11) is connected to one 1 × N array waveguide optical grating AWG (13), one 1 × N array waveguide optical grating AWG (13)
Output be connected to first Optical circulator (15), the output of the first Optical circulator (15) is connected to first optical branching device
(16), an output of optical branching device (16) is connected to an optical monitoring signal instrument (14), and the other end is connected to (M+1) × (M+
1) photoswitch (9), meanwhile, the output of broadcast signal transmission machine (8) is also connected to (M+1) × (M+1) photoswitch (9), (M+
1) M+1 output of × (M+1) photoswitch (9) is connected with the first Erbium-doped fiber amplifier by M roots feeder fiber (5) and one
The sharing fiber (6) of device (10) is connected to RN (2)；
2) in the far-end node RN (2) described in, the M roots feeder fiber (5) is respectively connecting to M REPEATER repeater
(18), feeder fiber (5) is connected to the 5th optical branching device (21), the first optical branching device in each REPEATER repeaters (18)
(16) one output is connected to an optical monitoring signal instrument (19), the other end by (M+1) × (M+1) photoswitch (9) with
And the 5th optical branching device (21) be connected to the photoswitch (20) of one 1 × 2, an output of 1 × 2 photoswitch (20) is connected to
One the first Coarse Wave Division Multiplexer (22), output one second Er-doped fiber of connection of first Coarse Wave Division Multiplexer (22)
Image intensifer EDFA (24) is connected with second Coarse Wave Division Multiplexer (26) afterwards, the first Coarse Wave Division Multiplexer (22) another
Output connection one the 3rd erbium doped optical fibre light amplifier EDFA (23) and second Optical circulator (25) afterwards with the second thick wavelength-division
Multiplexer (26) is connected, the output of the second Coarse Wave Division Multiplexer (26) and 21 × N array waveguide optical grating AWG (27) phase
Connect, 21 × N array waveguide optical grating AWG (27) N number of output passes through N roots profile fiber (42) and N number of optical network unit respectively
OUN (4) is connected；The sharing fiber (6) is connected with a 4th erbium doped optical fibre light amplifier EDFA (28), and its output passes through
It is divided into two-way after 3rd Coarse Wave Division Multiplexer (29), exports and one 1 all the way：M the second optical branching device (30) connection, its M road
Output is respectively connecting to 1 × 2 photoswitch (20) in M REPEATER repeater (18), and the 3rd Coarse Wave Division Multiplexer
(29) another way output is connected to a broadcast signal receiver RX (31), and it is exported and N number of distributed feedback laser DFB
(34) an electroabsorption modulator EAM is admitted to together by the output of 31 × N array waveguide optical grating AWG (33)
(32) after, electroabsorption modulator EAM (32) output is connected with a 5th erbium doped optical fibre light amplifier EDFA (36) its
Output passes through one 1：After M the 3rd optical branching device (35), the output of M roads is respectively connecting in M REPEATER repeater (18)
The second Optical circulator (25)；
3) M optical network unit OUN group (3) described in is each by M REPEATER repeater (18) in far-end node RN (2) respectively
From N number of optical network unit OUN (4) composition connected by N roots profile fiber (42)；In each optical network unit OUN (4), bag
Include the 4th Coarse Wave Division Multiplexer (37) of one to be connected with profile fiber (42), downstream signal reception machine (38), one
Individual broadcast signal receiver (39), one 1:2 the 4th optical branching device (40) and a reflective semiconductor optical amplifier RSOA
(41) form；The output all the way of 4th Coarse Wave Division Multiplexer (37) is connected directly to downstream signal reception machine (38), its another way
Output passes through one 1:2 the 4th optical branching device (40) is divided into two-way and is respectively connecting to a broadcast signal receiver (39) and one
Individual reflective semiconductor optical amplifier RSOA (41).
2. a kind of wavelength-division multiplex optical access network network realizes the biography of the transmission of broadcasting service and the extensive optical access network of defencive function
Transmission method, transmission and the defencive function of broadcasting service are realized using Wave division multiplexing passive optical network according to claim 1
The system of extensive optical access network operated, its transmission method difference is as follows：
1) it is specific special using one in the emitter (8) in central office CO (1) first for the transmission of broadcasting service
Wavelength XBFor the transmission of broadcast singal, after the photoswitch (9) for first passing through one (M+1) × (M+1), then mixed by one first
Erbium optical amplifier fiber EDFA (10) is sent into sharing fiber (6) after carrying out optical signal amplification, and is transferred to far-end node RN
(2)；In far-end node RN (2), the broadcast singal in sharing fiber (6) first passes around the 4th erbium doped optical fibre light amplifier
Wavelength is sent into by EDFA (28) after carrying out signal amplification by the 3rd Coarse Wave Division Multiplexer (29) in upper broadcast optical signal
Receiver (31), by receiver (31) by wavelength in λBOn broadcast optical signal be changed into electric signal, while be located at distal colorectal
N number of distributed feedback laser DFB (34) in point RN (2) produce N number of non-modulated up light source lambda '1,λ'2…λ'N-1,
λ'N, electroabsorption modulator EAM (32) is delivered to after carrying out wavelength multiplexing by 31 × N array waveguide optical grating AWG (33)；
In electroabsorption modulator EAM (32), using by being loaded with the electric signal of broadcasting service to up light caused by receiver (31)
Source λ '1,λ'2…λ'N-1,λ'NCarry out optical signal modulation so that up light source lambda '1,λ'2…λ'N-1,λ'NIn each wavelength be loaded with
Broadcast singal；The upper line light source for being loaded with broadcast singal enters traveling optical signal by a 5th erbium doped optical fibre light amplifier EDFA (36)
After amplification, pass through one 1：M the 3rd optical branching device (35) is divided into behind M roads to be delivered in M REPEATER repeater (18) respectively
The second Optical circulator (25), deliver to one after output to second Coarse Wave Division Multiplexer (26) for the second Optical circulator (25)
21 × N array waveguide optical grating AWG (27) demultiplex, be loaded with broadcast singal up light source lambda '1,λ'2…λ'N-1,λ'NThen
N number of optical network unit ONU (4) is sent to by N roots profile fiber (42)；The λ ' in optical network unit ONU (4)n, 1≤n≤N
By after the 4th Coarse Wave Division Multiplexer (37) by one 1:2 the 4th optical branching device (40) is divided into two parts, wherein one
The reception that receiver (39) is used for broadcasting service is sent into part, and another part is sent into reflective semiconductor optical amplifier RSOA (41)
Modulation for upward signal；
2) for the up-downgoing business in network, in the normal mode, the M optical line terminal OLT in central office CO (1)
(7) be each responsible for be used in M optical network unit group (3) N number of optical network unit (4) progress downlink information transmission with
The reception of row signal；In optical line terminal OLT (7), N number of emitter (1) produces the optical signal that N roads are each loaded with downlink information
λ1,λ2…λN-1,λN, N roads optical signal is by passing through afterwards after one 1 × N array waveguide optical grating AWG (13) wavelength multiplexing
One Optical circulator (15), (M+1) × (M+1) photoswitch (9) after far-end node RN (2) delivered to by feeder fiber (5)；Remote
In leaf RN (2), M roots feeder fiber will each be loaded with the optical signal λ of downlink information1,λ2…λN-1,λNIt is respectively connected to M
In REPEATER repeaters (18)；In REPEATER repeaters (18), the optical signal λ of downlink information is loaded with1,λ2…λN-1,λN
By after the photoswitch of one 1 × 2 (20), first Coarse Wave Division Multiplexer (22) by a second Er-doped fiber light amplification
Device EDFA (24) carries out optical signal amplification, then with being loaded with the upper line light source of broadcast singal in the second Coarse Wave Division Multiplexer (26)
λ'1,λ'2…λ'N-1,λ'NWavelength multiplexing, demultiplexed afterwards by 21 × N array waveguide optical grating AWG (27), its N road
Output will be loaded with the optical signal λ of downlink information by N roots profile fiber (42)nBe loaded with broadcast singal up light source lambda 'n, 1≤
N≤N transmits to N number of optical network unit ONU (4) together；In optical network unit ONU (4), pass through the 4th Coarse Wave Division Multiplexer
(37) demultiplex, the optical signal for being loaded with downlink information carries out the reception of downstream signal by receiver (38), and is loaded with broadcast letter
Number upper line light source pass through one 1:2 the 4th optical branching device (40) is divided into two parts, and a portion is sent into reflective half
Conductor image intensifer RSOA (41) is used for the modulation of upward signal, and another part is sent into receiver (39) and is used for connecing for broadcasting service
Receive；The λ ' after upward signal modulation is carried out in reflective semiconductor optical amplifier RSOA (41)nPass through 1:2 the 4th optical branching
The REPEATER that device (40), the 4th Coarse Wave Division Multiplexer (37) and profile fiber (42) return in far-end node RN (2) again
Repeater (18)；In REPEATER repeaters (18), pass through 21 × N array waveguide optical grating AWG (27) wavelength first
Multiplexing, subsequent upward signal λ '1,λ'2…λ'N-1,λ'NAfter the second Coarse Wave Division Multiplexer (26), the second Optical circulator (25)
Amplified by a 3rd erbium doped optical fibre light amplifier EDFA (23), through the first Coarse Wave Division Multiplexer (22) and 1 × 2 light after
The optical link that switch (20) is returned in central office CO (1) by the photoswitch (9) of feeder fiber (5) and (M+1) × (M+1) is whole
Hold OLT (7)；In optical line terminal OLT (7), upward signal λ '1,λ'2…λ'N-1,λ'NThrough the first Optical circulator (15) one
After individual 41 × N array waveguide optical grating AWG (17) demultiplexing, N roads upward signal λ '1,λ'2…λ'N-1,λ'NConnect respectively by N number of
Receipts machine (12) receives.
3. a kind of wavelength-division multiplex optical access network network according to claim 2 realizes transmission and the defencive function of broadcasting service
The transmission method of extensive optical access network, it realizes the method for defencive function：When any one appearance in M roots feeder fiber (5)
Failure, it can carry out 1 by sharing fiber (6):M shared protection；It is located at central office CO (1) interior light when an error occurs
Optical signal monitor instrument (14) in road terminal OLT (7) detects that uplink optical signal changes, and controls (M+1) × (M+1) photoswitch
(9) network is made to enter protected mode；Originally the light that the uplink and downlink signals in fault feeder optical fiber (5) pass through (M+1) × (M+1)
The switching of switch (9) is loaded onto on sharing fiber (6) to transmit together with broadcast singal；Failure is presented in far-end node RN (2) simultaneously
The optical signal monitor instrument (19) in REPEATER repeaters (18) that linear light fibre (5) is connected detects that downlink optical signal changes,
The photoswitch (20) of control 1 × 2 makes it into protected mode；Consequently, it is possible to it is loaded with the transmission of down direction sharing fiber descending
The optical signal λ of information1,λ2…λN-1,λNWith the optical signal λ for being loaded with broadcast messageBTo far-end node RN (2)；In far-end node RN
(2) in, the optical signal λ of downlink information1,λ2…λN-1,λNWith the λ for being loaded with broadcast optical signalBPass through a 4th er-doped light first
Fine image intensifer EDFA (28) amplification, is then demultiplexed in the 3rd Coarse Wave Division Multiplexer (29), is loaded with broadcast optical signal
λBFeeding receiver (31) identical with normal mode, and the optical signal λ of downlink information1,λ2…λN-1,λNPass through 1:The light of M second
Shunt (30) delivers to 1 × 2 photoswitch (20) of M REPEATER repeater respectively；Fault feeder optical fiber (5) is connected
1 × 2 photoswitch (20) in REPEATER repeaters (18) is by the optical signal λ of downlink information1,λ2…λN-1,λNDeliver to thick λ
'1,λ'2…λ'N-1,λ'NPass through 1:The optical branching devices of M second (30) and the 3rd Coarse Wave Division Multiplexer (29) are sent into sharing fiber (6),
And remaining REPEATER repeater then unaffected normal work；Up direction, upward signal λ ' in sharing fiber (6)1,λ'2…
λ'N-1,λ'NOptical line terminal OLT corresponding to being delivered to by (M+1) × (M+1) photoswitch (9) with fault feeder optical fiber (5)
(7) reception of upward signal is realized in.
4. a kind of wavelength-division multiplex optical access network network according to claim 2 realizes transmission and the defencive function of broadcasting service
The transmission method of extensive optical access network, it is characterised in that：Network size can be flexibly selected according to actual conditions, in whole network
N number of upstream wavelength, N number of downstream wavelength, broadcast proprietary wavelength, a sharing fiber and a M root feeder fibers are shared, so whole
Individual network can provide N × M altogether and up-downgoing wavelength channel is transmitted；When needing to provide large-scale width for a large number of users
During leased line service, it can be realized by increasing M numerical value；The four, the 5th Er-doped fiber light in far-end node RN (2) are put
Big device EDFA (28,36) is used as optional amplifier, for ensureing, when M is larger, enough power to be provided for data traffic transmission；
When needing network to provide the broadband access of long range, optional first Er-doped fiber light can be added in central office CO (1) and put
Big device EDFA (10), increase the transmission range of network with this.
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| CN101820352A (en) * | 2009-11-03 | 2010-09-01 | 上海大学 | System and method of wavelength division multiplexing passive optical network for realizing broadcast functions |
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| CN102695101A (en) * | 2011-03-21 | 2012-09-26 | 苏州海光芯创光电科技有限公司 | Passive optical network over wavelength division multiplexing |
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| CN101820352A (en) * | 2009-11-03 | 2010-09-01 | 上海大学 | System and method of wavelength division multiplexing passive optical network for realizing broadcast functions |
| CN102075282A (en) * | 2011-02-24 | 2011-05-25 | 上海大学 | System and method for realizing dynamic wavelength scheduling and protection functions in wavelength division multiplexing passive optical network |
| CN102695101A (en) * | 2011-03-21 | 2012-09-26 | 苏州海光芯创光电科技有限公司 | Passive optical network over wavelength division multiplexing |
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