CN110248263A - Realize the three-dimensional passive optical access network system of direct communication and protection between any ONU - Google Patents

Realize the three-dimensional passive optical access network system of direct communication and protection between any ONU Download PDF

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Publication number
CN110248263A
CN110248263A CN201910531825.9A CN201910531825A CN110248263A CN 110248263 A CN110248263 A CN 110248263A CN 201910531825 A CN201910531825 A CN 201910531825A CN 110248263 A CN110248263 A CN 110248263A
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onu
mouthfuls
signal
coupler
mouthful
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CN110248263B (en
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申京
戚晓勇
李永杰
赵豫京
张毓琪
王正
李功明
陈媛媛
林薇
甘朝钦
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State Grid Corp of China SGCC
Information and Telecommunication Branch of State Grid Henan Electric Power Co Ltd
University of Shanghai for Science and Technology
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State Grid Corp of China SGCC
Information and Telecommunication Branch of State Grid Henan Electric Power Co Ltd
University of Shanghai for Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0003—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0022—Construction using fibre gratings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0043—Fault tolerance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)

Abstract

The three-dimensional passive optical access network system of direct communication and protection between any ONU of realization of the invention; wherein, mainly there are an optical sender array, 1 × 2 array of photoswitch, two optical multiplexers, two EDFA Erbium-Doped Fiber Amplifiers, two common optical circulators, 2 × 2 photoswitches, a photo-coupler, an optical demultiplexer and a photoreceiver array in central office；Distant-end node includes two coarse wavelength division demultiplexers and a n × n array waveguide optical grating；ONU includes three Coarse Wave Division Multiplexers, five photo-couplers, two optical splitters, three photoswitches, four optical circulators, an optical sender, two photoreceivers, a wavelength separator, a wavelengths filters and a reflective semiconductor optical amplifier.The present invention not only realizes the direct communication in convergence access net between any optical network unit by three dimensional topology, but also has flexible defencive function, makes system that can also reach perfect condition between cost and performance.

Description

Realize the three-dimensional passive optical access network system of direct communication and protection between any ONU
Technical field
The present invention relates to optical communication fields, especially realize that direct communication and the three-dimensional passive light of protection connect between any ONU Networking system.
Background technique
Traditional optical-fiber network is made of core layer, convergence layer and access layer, and signal of communication is transmitted to user terminal by core layer, It is received after user terminal is converted into electrical power by corresponding user, for the high performance requirements for meeting future optical networks, to reduce letter For the purpose of number power loss and delay etc., network flattening has become the inexorable trend of optical communication network development, passive optical network Network PON framework is because the advantages that its structure is simple, network capacity is transparent and lower power loss, is as the master in Future Access Network Want research topic.PON structure is multiple based on the time-division wavelength-division that time-division multiplex technology TDM, wavelength-division multiplex technique WDM and the two mix With technology TWDM, smooth capacity upgrading, time-division Wave division multiplexing passive optical network TWDM- are carried out to meet the following optic communication framework PON is considered as the most optical communication system of realistic meaning in Next Generation Access scheme, currently, TWDM-PON system is in reality The downlink signal transmission rate of 40Gbps and the uplink signal transmissions bandwidth of 10Gbps can be achieved in.Convergence access one Change combines together convergence layer and access layer, to efficiently reduce the redundancy of network structure, expand network capacity and mention High RST efficiency of transmission.In addition, not can be carried out direct communication between ONU in traditional optical access network, i.e., if two ONU Between to be communicated, then signal of communication must return to central office CO and distant-end node RN, the transmission of signal detour is bound to cause The problems such as great system delay, the signal jam at the end CO or RN and biggish power loss, therefore realize each subscriber unit Between efficient communication will become optimization system performance inexorable trend.
System proposed by the present invention not only may be implemented the direct communication between any ONU but also also proposed between ONU directly The optimal path selection of communication, has both defencive function, and system is made to be attained by perfect condition between cost and performance.
Summary of the invention
It is an object of the invention in view of the defects existing in the prior art, and to the high reliability of the following optical access network and big Scale accesses development trend, provides the three-dimensional passive optical access network system of direct communication and protection between realizing any ONU, can be Physical layer constructs virtual communication link between different ONU and provides self-healed protection function, to support the access of the following multiplication to use Family.Its technical solution solved is to connect one by Waveguide array light by two single mode feeder fibers by a central office CO The novel passive distant-end node RN that grid AWG and Coarse Wave Division Multiplexer CWDM is constituted, the distant-end node pass through profile fiber and n × n A ONU is connected, and two neighboring ONU is connected by interconnection optical fiber, while the ONU on first ring and corresponding ONU on nth ring Between also by interconnection optical fiber be connected, the communication of three kinds of signals between n × n ONU of network support, these three types of signals are respectively: downlink Signal, uplink signal and direct communication signal, it is characterised in that:
The central office CO includes n × n optical sender array Tx1 1~Tx1 n, Tx2 1~Tx2 n, Txn 1~Txn n, transmitter Array is connected to the array of photoswitch OS being made of n × n 1 × 2 photoswitches1 1~OS1 n, OS2 1~OS2 n, OSn 1~OSn n, this 1 The upper port of × 2 array of photoswitch connects a first wavelength division multiplexer MUX1, lower port one the second wavelength division multiplexer of connection MUX2, the output end of described two MUX respectively with the first, second EDFA Erbium-Doped Fiber Amplifier EDFA1, EDFA2It is connected, the two EDFA again respectively with the first, second common optical circulator Circulator1,Circulator21 mouthful be connected, two common rings of light 2 mouthfuls of shape device are connected to 2 × 2 photoswitch OS1；
3 mouthfuls of the common optical circulator of described first, second are connected to 2 × 1 photo-coupler Coupler1Two Input terminal, the output end of 2 × 1 photo-coupler are connected to a solution wavelength division multiplexer DMUX, under hung other n × n light Receiver Rx1 1~Rx1 n, Rx2 1~Rx2 n, Rxn 1~Rxn n；
The distant-end node RN includes a n × n array waveguide optical grating AWG, first left port and the first thick wave Division multiplexer CWDM1Right output port is connected, the right a port and the second Coarse Wave Division Multiplexer CWDM2Left port connection, two CWDM is used to signal of communication of the mask work on red band and blue wave band, uses ONUi jIndicate i-th transverse direction ONU ring On j-th of ONU, the first Coarse Wave Division Multiplexer CWDM1Left end exports two-way: 1 mouthful connects an optical-fiber network for the first via Unit ONUn n；2 mouthfuls are connected to central office CO for the second tunnel；
The second Coarse Wave Division Multiplexer CWDM2Right end exports two-way: 1 mouthful is connected to central office CO for the first via；2 mouthfuls are Second tunnel and an optical network unit ONU1 1It is connected, remaining port of AWG is connected with corresponding optical network unit ONU, constitutes Three-dimensional structure；
The internal structure of the optical network unit, each optical network unit is identical, therefore with ONU1 1For, including one 22 × 2 photoswitch OS1, 3 mouthfuls pass through one first closing optical circulator Cir11 mouthful into, 2 mouthfuls go out to be connected to one the 5th it is thick Wavelength division multiplexer CWDM3；
The Coarse Wave Division Multiplexer CWDM33 mouthfuls of right end connections, one the first splitter Splitter1, the Splitter11 Mouth enters the 61 × 2nd photo-coupler Coupler by a wavelength separator WB52 mouthfuls of lower end, from Coupler5It is upper Port is output and then enter the second closing optical circulator Cir23 mouthfuls, Coupler51 mouthful of lower end and a 6 port photoswitch OS2 2 mouthfuls be connected；
The second closing optical circulator Cir21 mouthful be connected to 4 mouthfuls of the 22 × 2nd photoswitch；First splitter Splitter12 mouthfuls with the 4th common optical circulator Cir41 mouthful be connected, 2 mouthfuls of the circulator are connected to a wavelengths filters WF, then with the second splitter Splitter2Connection, the second splitter Splitter21 mouthful of right end connection one reflective partly lead Body amplifier RSOA, 2 mouthfuls of right end and photoreceiver Rx1It is connected；
The Coarse Wave Division Multiplexer CWDM31 mouthful of right end and the 31 × 2nd photo-coupler Coupler2The connection of 2 mouthfuls of left end；
The first closing optical circulator Cir13 mouthfuls with third Coarse Wave Division Multiplexer CWDM1Left port connection, third are thick Wavelength division multiplexer CWDM13 mouthfuls of right end pass through the 21 × 2nd photo-coupler Coupler1It is annular with the 4th normal light after 2 mouthfuls of right end Device Cir43 mouthfuls be connected, 1 mouthful of right end and photoswitch OS21 mouthful be connected；
21 × 2nd photo-coupler Coupler11 mouthful of right end and the 4th Coarse Wave Division Multiplexer CWDM22 mouthfuls of left end It is connected, the right output port of the CWDM is connected to the second closing optical circulator Cir22 mouthfuls, 3 mouthfuls of left end and the 31 × 2nd optical coupling Device Coupler21 mouthful of left end be connected, Coupler2Right output port and 1 × 2 photoswitch OS31 mouthful connection, the OS32 Mouth is connected to the 51 × 2nd photo-coupler Coupler4From Coupler behind 1 mouthful of lower end4Upper port and photoswitch OS24 mouthfuls of phases Even；
The photoswitch OS33 mouthfuls with the 41 × 2nd photo-coupler Coupler32 mouthfuls of left end be connected, Coupler3The right side Port is connected to the common optical circulator Cir of 4 ports31 mouthful, then from Cir33 mouthfuls go out be connected with optical sender Tx, Coupler31 mouthful of left end be connected to photoswitch OS25 ports；Cir32 mouthfuls with photoreceiver Rx2Connection, 4 mouthfuls and the 5th 1 × 2 photo-coupler Coupler4The connection of 2 mouthfuls of lower end, in ONU all CWDM can mask work in blue, red and yellow wave band Signal wavelength, guarantee that system communication under normal mode of operation and protection operating mode is normal.
Due to the use of above technical scheme, the invention has the following advantages over the prior art: at the CO of central office Optic communication signal carrier in the road n × n is generated using optical sender array, after array of photoswitch is by wavelength division multiplexer MUX multiplex It is transmitted to distant-end node RN by single mode feeder fiber, feeder line light is realized by setting photoswitch and protection optical fiber between CO and RN Fine privacy protection, Coarse Wave Division Multiplexer CWDM are used to separate the uplink and downlink signals under normal mode of operation and protected mode, and And communication wavelengths are routed using array waveguide grating AWG, wavelength is worked normally for each ONU transmission, is passed through inside ONU Photoswitch and optical circulator realize the switching of normal mode of operation and protected mode, not only may be implemented direct between any ONU The optimal path selection of direct communication between ONU is communicated and be also proposed, and self-healed protection function is provided, realizes each subscriber unit Between efficient communication, so that system is attained by perfect condition between cost and performance.
Detailed description of the invention
Fig. 1 is that the present invention realizes direct communication and the signal of the three-dimensional passive optical access network system structure of protection between any ONU Figure.
Fig. 2 is optical network unit ONU of the present invention1 1Structural schematic diagram.
Fig. 3 is optical network unit ONU of the present invention1 2Structural schematic diagram.
Fig. 4 is optical network unit ONU of the present invention2 1Structural schematic diagram.
Fig. 5 is system structure diagram under fiber failure protected mode of the present invention.
When Fig. 6 is feeder fiber failure, optical network unit ONU1 nStructural schematic diagram.
When Fig. 7 is profile fiber failure and interconnection fiber failure, optical network unit ONU1 1Structural schematic diagram.
When Fig. 8 is interconnection fiber failure, optical network unit ONU1 2Structural schematic diagram.
When Fig. 9 is interconnection fiber failure, optical network unit ONU2 1Structural schematic diagram.
When Figure 10 is interconnection fiber failure, optical network unit ONU2 2Structural schematic diagram.
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to figures 1 through Figure 10 pairs In the detailed description of embodiment, can clearly it present.The structure content being previously mentioned in following embodiment is attached with specification Figure is reference.
Embodiment one: realizing the three-dimensional passive optical access network system of direct communication and protection between any ONU, referring to Fig. 1 and Fig. 2 connects one by array waveguide grating AWG12 and thick wavelength-division by two single mode feeder fibers 8,9 by a central office CO1 Multiplexer CWDM10, the 13 novel passive distant-end node RN11 constituted, which passes through profile fiber 14 and n × n is a ONU16 is connected, and two neighboring ONU16 is connected by interconnection optical fiber 15, while opposite on the ONU16 on first ring and nth ring It is connected between the ONU16 answered also by interconnection optical fiber 15, the communication of three kinds of signals between n × n ONU16 of network support, these three types letter Number it is respectively: downlink signal, uplink signal and direct communication signal；As shown in Figure 1, central office CO1 includes n × n light emitting Machine array Tx1 1~Tx1 n, Tx2 1~Tx2 n, Txn 1~Txn n2, transmitter array, which is connected to, to be made of n × n 1 × 2 photoswitches Array of photoswitch OS1 1~OS1 n, OS2 1~OS2 n, OSn 1~OSn n3, the upper port of 1 × 2 array of photoswitch 3 connects one first Wavelength division multiplexer MUX14, lower port connects a second wavelength division multiplexer MUX2The output end of 19, described two MUX4,19 is distinguished With the first, second EDFA Erbium-Doped Fiber Amplifier EDFA15, EDFA220 are connected, the two EDFA5,20 is general with first, second respectively again Light passing circulator Circulator16,Circulator21 mouthful of 21 is connected, and 2 mouthfuls of two common optical circulators 6,21 are connected to One 2 × 2 photoswitch OS17,3 mouthfuls of the common optical circulator 6,21 of described first, second are connected to 2 × 1 photo-couplers Coupler118 two input terminals, the output end of 2 × 1 photo-coupler 18 are connected to a solution wavelength division multiplexer DMUX17, Other n × n photoreceiver Rx has been hung under it1 1~Rx1 n, Rx2 1~Rx2 n, Rxn 1~Rxn n22；
As shown in fig. 1, distant-end node RN11 includes a n × n array waveguide optical grating AWG12, first left end Mouth and the first Coarse Wave Division Multiplexer CWDM110 right output ports are connected, the right a port and the second Coarse Wave Division Multiplexer CWDM213 Left port connection, two CWDM10,13 are all used to signal of communication of the mask work on red band and blue wave band, use ONUi jIndicate j-th of ONU on i-th transverse direction ONU ring, the first Coarse Wave Division Multiplexer CWDM110 left ends output two-way: 1 Mouth is that the first via connects an optical network unit ONUn n16；2 mouthfuls are connected to central office CO1, the second thick wavelength-division for the second tunnel Multiplexer CWDM213 right ends export two-way: 1 mouthful is connected to central office CO1 for the first via；2 mouthfuls are the second tunnel and an optical-fiber network Unit ONU1 144 are connected, and remaining port of AWG12 is connected with corresponding optical network unit ONU 16, constitute three-dimensional structure；
The internal structure of optical network unit as shown in Figure 2, each optical network unit is identical, therefore with ONU1 1For 44, Including the 22 × 2nd photoswitch OS124,3 mouthfuls pass through one first closing optical circulator Cir11 mouthful of 23 is into 2 mouthfuls go out to connect It is connected to a 5th Coarse Wave Division Multiplexer CWDM343, the Coarse Wave Division Multiplexer CWDM343 3 mouthfuls of right ends connect first branch Device Splitter138, the Splitter11 mouthful of 38 enters the 61 × 2nd photo-coupler by a wavelength separator WB37 Coupler52 mouthfuls of 27 lower end, from Coupler527 upper port is output and then enter the second closing optical circulator Cir23 mouthfuls of 26, Coupler51 mouthful of 27 lower end and a 6 port photoswitch OS22 mouthfuls of 45 are connected, the second closing optical circulator Cir226 1 mouthful be connected to 4 mouthfuls of the 22 × 2nd photoswitch 45, the first splitter Splitter12 mouthfuls of 38 and the 4th common ring of light Shape device Cir41 mouthful of 36 is connected, and 2 mouthfuls of the circulator are connected to a wavelengths filters WF34, then with the second splitter Splitter233 connections, the second splitter Splitter233 1 mouthful of right end connection, one reflective semiconductor amplifier RSOA31,2 mouthfuls of right end and photoreceiver Rx132 are connected, the Coarse Wave Division Multiplexer CWDM343 1 mouthful of right ends and the 31 × 2nd optocoupler Clutch Coupler241 2 mouthfuls of left end connection, the first closing optical circulator Cir13 mouthfuls of 23 and third Coarse Wave Division Multiplexer CWDM1The connection of 39 left ports, third Coarse Wave Division Multiplexer CWDM13 mouthfuls of right end of 39 pass through the 21 × 2nd photo-coupler Coupler1After 40 2 mouthfuls of right ends with the 4th common optical circulator Cir43 mouthfuls of 36 are connected, 1 mouthful of right end and photoswitch OS2The 1 of 45 Mouth is connected, the 21 × 2nd photo-coupler Coupler11 mouthful of 40 right end and the 4th Coarse Wave Division Multiplexer CWDM225 left end 2 Mouth is connected, and the right output port of the CWDM25 is connected to the second closing optical circulator Cir22 mouthfuls of 26,3 mouthfuls of left end and the 31 × 2nd Photo-coupler Coupler241 1 mouthful of left end is connected, Coupler241 right output port and 1 × 2 photoswitch OS342 1 mouthful of company It connects, the OS32 mouthfuls of 42 are connected to the 51 × 2nd photo-coupler Coupler4From Coupler behind 28 1 mouthful of lower ends428 upper port with Photoswitch OS24 mouthfuls of 45 are connected, the photoswitch OS33 mouthfuls of 42 and the 41 × 2nd photo-coupler Coupler32 mouthfuls of 35 left end It is connected, Coupler335 right output port is connected to the common optical circulator Cir of 4 ports31 mouthful of 46, then from Cir3The 3 of 46 Mouth goes out to be connected with optical sender Tx29, Coupler335 1 mouthful of left end is connected to photoswitch OS245 5 ports；Cir32 mouthfuls of 46 With photoreceiver Rx230 connections, 4 mouthfuls and the 51 × 2nd photo-coupler Coupler428 2 mouthfuls of lower ends connect, all in ONU16 CWDM25,39,43 can mask work in the signal wavelength of blue, red and yellow wave band, guarantee system in normal and protection work Communication is normal under mode.
Embodiment two, on the basis of example 1, above-mentioned ONU normal mode of operation are as follows:
Wavelength Xi bjIt indicates that the wavelength works in blue zone, and is assigned to ONUi jAbove and below under transmission normal mode of operation Row signal, wavelength Xi yjMean that wavelength work is ONU in yellowish leukorrheai jInternal direct communication signal is transmitted, mould is being worked normally Under formula, as shown in Figure 1, optical sender array 2 is using DPSK modulation n × n blue band wavelength λ in the CO1 of central office1 b1~λ1 bn, λ2 b1~λ2 bn..., λn b1~λn bnAs ONU16 downstream signal wavelengths, these downlink signals pass through the 1 of 1 × 2 array of photoswitch 3 Mouth is into 3 mouthfuls export to wavelength division multiplexer MUX219, pass through erbium-doped optical fiber amplifier EDFA after multiplexing220 amplifications, amplified letter Number enter optical circulator Circulator21 mouthful of 21 is exported from 2 mouthfuls again, enters OS later12 mouthfuls of 7 are exported from 4 mouthfuls again, downlink Signal is transmitted to RN11 from CO1 along working optical fibre 9, into after RN11, signal CWDM from RN111After 10 lower port output Reach the port L of AWG121, using the peri odic spectrum cycle characteristics of AWG, downlink signal is successively from port R1To RnIt exports and passes through Profile fiber 14,47 is transmitted to ONU16, as shown in Fig. 2, with ONU1 1For 44, downlink signal λ1 b1~λ1 bnBy photoswitch OS124 1 mouthful entrance, 3 mouthfuls output, using closing optical circulator Cir123 and Coarse Wave Division Multiplexer CWDM343, subsequently enter splitter Splitter138, Splitter1Downlink signal is divided into two paths of signals by power ratio 1:1 by 38, and signal reaches wavelength and blocks all the way Device WB37, WB37 block ONU1 144 downstream signal wavelengths and allow ONU1 2~ONU1 n16 downstream signal wavelengths pass through, ONU1 2 ~ONU1 n16 downlink signal passes through Coupler527, then arrive at Cir23 mouthfuls of 26 are exported from 1 mouthful again, and signal enters OS124 4 mouthfuls, then from OS1Through by interconnection optical fiber 15, transversely ONU ring is transmitted to ONU clockwise after 24 2 mouthfuls of outputs1 216, according to It is secondary to analogize, until downlink signal is transmitted to ONU1 n16, another way signal reaches Cir41 mouthful of 36 is exported from 2 mouthfuls again, is passed through later Wavelength filter WF34, WF34 filter out ONU1 144 downstream signal wavelengths simultaneously allow it to pass through, and block ONU1 2~ONU1 n16 Downlink signal, the ONU filtered1 144 downlink signals again pass by splitter Splitter2After 33, ONU1 144 downlink signals are divided into Two paths of signals, signal is by ONU all the way1 144 photoreceiver Rx132 receive, and another way signal is injected into RSOA31, RSOA31 is by ONU1 1Re-modulate after the amplification of 44 downlink signals and erasing is uplink signal；
Similarly, as shown in Fig. 2, with ONU1 1For 44, uplink signal is from Cir436 2 mouthfuls of inputs, then after 3 mouthfuls of output Reach Coupler140, come from ONU1 2~ONU1 n16 uplink signal passes through OS12 mouthfuls of 24 and 4 mouthfuls using Cir21 mouthful of 26 With 2 mouthfuls of arrival CWDM22 mouthfuls of 25, by Coupler after output140, Coupler140 by ONU1 144 uplink signal and ONU1 2 ~ONU1 n16 uplink signal is coupled into signal all the way, the ONU after coupling1 1~ONU1 n16 uplink signal is from CWDM1The 3 of 39 Mouthful output, signal is from Cir later123 3 mouthfuls of inputs, 1 mouthful of output, then signal reaches OS13 mouthfuls of 24 are exported by 1 mouthful again, via Profile fiber 14,47 is transmitted to the CWDM in RN12213, transversely ONU ring is counterclockwise transmitted to RN12 to uplink signal, believes Number from CWDM2The R of AWG12 is reached after 13 2 mouthfuls of inputs1Mouthful, using the periodic allocation characteristic of AWG, signal will be from AWG12's L1Mouth output, passes central office CO1 back via feeder fiber 9, uplink signal is via photoswitch OS in CO114 mouthfuls of 7 are into 2 mouthfuls go out Reach optical circulator Cir22 mouthfuls of 21, then by Cir23 mouthfuls of 21, which go out, enters demultiplexer DMUX17, after demultiplexed device demultiplexing By photoreceiver array received.
Embodiment three, on the basis of example 1, direct communication between the ONU are as follows: as shown in Figures 2 and 3, when ONU1 144 and ONU1 2When 63 communication, ONU1 1Tunable transmitter Tx29 in 44 will generate ONU1 263 internal communication signal λ1 y2, direct communication signal λ1 y2Via optical circulator Cir346 3 mouthfuls of inputs are exported from 4 mouthfuls again, reach coupler Coupler428 Using photoswitch OS24 mouthfuls of 45, signal is from photoswitch OS2Cir is reached after 45 2 mouthfuls of outputs23 mouthfuls of 26, from Cir2The 1 of 26 Pass through photoswitch OS after mouth output124 are transmitted to ONU1 263, in ONU1 2Signal passes through Cir in 63152 and CWDM3After 64 from its 1 Mouth output enters Coupler261, signal enters photoswitch OS3It is exported behind 62 port 1 from port 3 and reaches Coupler360, it connects Via Cir31 mouthful of 56 into, 2 mouthfuls go out after by ONU1 263 signal receiver Rx258 receive；
As shown in Figure 2 and Figure 4, work as ONU1 144 and ONU2 1109 are communicated, ONU1 1Tunable signal transmitter in 44 Tx29 generates ONU2 1109 direct communication signal λ2 y1, signal successively passes through Cir346 and Coupler4OS is reached after 282The 4 of 45 Mouthful, signal is from OS2ONU is reached along interconnection optical fiber 50,81 after 45 3 mouthfuls of outputs2 1OS26 mouthfuls of 87, from OS25 mouthfuls of 87 are defeated Signal Coupler after out4105 and Cir389 again by ONU2 1Signal receiver Rx in 1092100 receive, and are being not necessarily to round-trip center Under the premise of office CO and distant-end node RN, network completes the direct communication between an optical network unit ONU.
Example IV, on the basis of example 1, the ONU protected mode include feeder fiber privacy protection method, Profile fiber failure protection scheme, three kinds of fiber failure protection scheme of interconnection；
Feeder fiber privacy protection method: when the feeder fiber 47 between central office CO1 and distant-end node RN11 breaks down, Fault point is as shown in I in Fig. 5, and 31 mouthfuls of 1 × 2 array of photoswitch is connected with 2 mouthfuls in CO1, and tunable transmitter array 2 uses DPSK Modulate n × n red band wavelength λ1 r1~λ1 rn, λ2 r1~λ2 rn..., λn r1~λn rnAs ONU16 downlink signal under protected mode Wavelength, by optical multiplexer MUX14, EDFA15 and Circulator1Enter OS after 617, OS11 mouthful of 7 is connected with 3 mouthfuls, and signal will It is switched in backup path and is transmitted to CWDM in RN11 using protection optical fiber 8213, R of the signal from AWG121Mouthful into, utilize The peri odic spectrum cycle characteristics of AWG, downlink signal is successively from L1Mouthful to LnMouth is exported and is transmitted to by profile fiber 14,47 The uplink and downlink signals transmission direction of ONU16, uplink and downlink signals transmission direction and normal mode of operation lower network is on the contrary, network communication Restored, under protected mode, with ONU1 nFor 127, as shown in fig. 6, downlink signal reaches OS by profile fiber 1141112 2 mouthfuls, then exported from 3 mouthfuls, signal successively passes through Cir1111, CWDM3126 and Splitter1It is divided into two paths of signals after 123, Pass through Cir all the way4121, WF120 and Splitter2119 reach Rx1118 and RSOA117 completes downstream signal reception and readjustment System；Another way passes through WB122, Coupler5116 and Cir2115 reach OS14 mouthfuls of 112, from OS14 mouthfuls of 112 go out into 1 mouthful, warp ONU is reached by interconnection optical fiber 1101 (n-1)16, and so on, until downlink signal is sent to ONU1 144, restore communication, ONU1 nThe downlink signal received readjustment is made as uplink signal by the RSOA117 in 127, which passes through Splitter2119, WF120 and Cir4121 pass through Coupler again1125, come from ONU1 1~ONU1 (n-1)16 uplink signal passes through OS11 mouthful of 112 and 4 mouthfuls of arrival Cir2115, signal is from Cir2115 1 mouthful of input reaches CWDM from 2 mouthfuls of outputs again2113, it works in the upper of red wave band Row signal is from CWDM2113 1 mouthful of output reaches Coupler1125, Coupler1125 by ONU1 n127 uplink signal and ONU1 1 ~ONU1 (n-1)16 uplink signal is coupled into signal all the way, and the signal after coupling passes through Cir1111 and OS1112, from OS1112 Through being sent to the CWDM of RN11 by profile fiber 114 after 2 mouthfuls of outputs213, then reach the L of AWG121Mouthful, utilize the period of AWG Property partition characteristic, signal will be from the R of AWG121Mouth output passes central office CO1 back via protection optical fiber 8, via photoswitch OS17
3 mouthfuls into 1 mouthful go out, using optical circulator Circulator12 mouthfuls of 6 go out into 3 mouthfuls, by coupler Coupler1It is received after 18 and optical demultiplexer DMUX17 by array acceptor Rx22, completes uplink signal and restore；
Profile fiber failure protection scheme: as shown in II in Fig. 5, when profile fiber 14,47 breaks down, in protection mould Under formula, protection mechanism is identical as feeder fiber error protection, and 31 mouthfuls of 1 × 2 array of photoswitch is connected with 2 mouthfuls in CO1, tunable Transmitter array 2 is using n × n red band wavelength λ of DPSK modulation1 r1~λ1 rn, λ2 r1~λ2 rn..., λn r1~λn rnAs protection The uplink and downlink signals of ONU16 downstream signal wavelengths under mode, uplink and downlink signals transmission direction and normal mode of operation lower network pass Defeated contrary, network communication is restored；
Interconnect fiber failure protection scheme: when Single Point of Faliure occurs for the interconnection optical fiber 15,48,51 between ONU16, such as Fig. 5 In shown in III, using fault point as separation, lateral ONU ring is divided into semi-ring, upper half ring ONU up and down and is in normal mode of operation, under Semi-ring ONU is then in protected mode, and the ONU uplink and downlink signals under normal mode work on the ONU under blue wave band, protected mode Downlink signal works in red wave band, which can equally provide the multipoint fault protection of interconnection optical fiber, multipoint fault protection machine System is identical as Single Point of Faliure, as shown in Fig. 7-Figure 10, if ONU1 144 and ONU1 263 direct communications, then ONU1 144 will be loaded with ONU1 2The wavelength X of 63 direct communication signals1 y2ONU is transmitted to via longitudinal interconnection optical fiber 50,812 16 mouthfuls of 109 OS287, from 1 mouthful of OS287 goes out, and goes out via 1 mouthful of CWDM1128 into left port, by closing optical circulator Cir13 mouthfuls of 80 go out into 1 mouthful, Pass through OS13 mouthfuls of 82 go out into 2 mouthfuls, are sent to ONU using laterally interconnection optical fiber 84,1292 2140 OS11 mouthful of 131, from OS14 mouthfuls of 131 go out, by Cir2133 and CWDM2132, from CWDM23 mouthfuls of 132 go out, and pass through Coupler2After 138 through by OS31 mouthful of 139 goes out into 2 mouthfuls, by Coupler4136, from OS24 mouthfuls of 135 go out into 6 mouthfuls, finally interconnect optical fiber using longitudinal 59,130 are transmitted to ONU1 263 OS23 mouthfuls of 54,5 mouthfuls go out to enter Coupler360, via Cir31 mouthful of 56 goes out into 2 mouthfuls, finally By photoreceiver Rx258 receive, and complete signal and restore.

Claims (4)

1. realizing the three-dimensional passive optical access network system of direct communication and protection between any ONU, passed through by a central office CO (1) Two single mode feeder fibers (8,9) connect one by array waveguide grating AWG (12) and Coarse Wave Division Multiplexer CWDM (10,13) structure At novel passive distant-end node RN (11), which is connected by profile fiber (14) with n × n ONU (16), adjacent Two ONU (16) are connected by interconnection optical fiber (15), while the ONU (16) on first ring and corresponding ONU on nth ring (16) it is connected between also by interconnection optical fiber (15), the communication of three kinds of signals, these three types of signals between n × n ONU of network support (16) It is respectively: downlink signal, uplink signal and direct communication signal, it is characterised in that:
The central office CO (1) includes n × n optical sender array Tx1 1~Tx1 n, Tx2 1~Tx2 n, Txn 1~Txn n(2), emit Machine array is connected to the array of photoswitch OS being made of n × n 1 × 2 photoswitches1 1~OS1 n, OS2 1~OS2 n, OSn 1~OSn n (3), the upper port of 1 × 2 array of photoswitch (3) connects a first wavelength division multiplexer MUX1(4), lower port connection one the Two wavelength division multiplexer MUX2(19), the output end of described two MUX (4,19) respectively with the first, second EDFA Erbium-Doped Fiber Amplifier EDFA1(5), EDFA2(20) be connected, the two EDFA (5,20) again respectively with the first, second common optical circulator Circulator1(6),Circulator2(21) 1 mouthful is connected, and 2 mouthfuls of two common optical circulators (6,21) are connected to one 2 × 2 photoswitch OS1(7)；
3 mouthfuls of the common optical circulator of described first, second (6,21) are connected to 2 × 1 photo-coupler Coupler1(18) Two input terminals, the output end of 2 × 1 photo-coupler (18) is connected to a solution wavelength division multiplexer DMUX (17), lower to hang In addition n × n photoreceiver Rx1 1~Rx1 n, Rx2 1~Rx2 n, Rxn 1~Rxn n(22)；
The distant-end node RN (11) includes a n × n array waveguide optical grating AWG (12), first left port and first Coarse Wave Division Multiplexer CWDM1(10) right output port is connected, the right a port and the second Coarse Wave Division Multiplexer CWDM2(13) left end Mouth connection, two CWDM (10,13) are all used to signal of communication of the mask work on red band and blue wave band, use ONUi j Indicate j-th of ONU on i-th transverse direction ONU ring, the first Coarse Wave Division Multiplexer CWDM1(10) left end output two-way: 1 mouthful An optical network unit ONU is connected for the first vian n(16)；2 mouthfuls are connected to central office CO (1) for the second tunnel；
The second Coarse Wave Division Multiplexer CWDM2(13) right end exports two-way: 1 mouthful is connected to central office CO (1) for the first via；2 mouthfuls For the second tunnel and an optical network unit ONU1 1(44) be connected, remaining port of AWG (12) with corresponding optical network unit ONU (16) it is connected, constitutes three-dimensional structure；
The internal structure of the optical network unit, each optical network unit is identical, therefore with ONU1 1(44) for, including one 22 × 2 photoswitch OS1(24), pass through one first closing optical circulator Cir for 3 mouthfuls1(23) 1 mouthful is into 2 mouthfuls go out to be connected to one A 5th Coarse Wave Division Multiplexer CWDM3(43)；
The Coarse Wave Division Multiplexer CWDM3(43) 3 mouthfuls of right end connections, one the first splitter Splitter1(38), should Splitter1(38) 1 mouthful enters the 61 × 2nd photo-coupler Coupler by a wavelength separator WB (37)5(27) 2 mouthfuls of lower end, from Coupler5(27) upper port is output and then enter the second closing optical circulator Cir2(26) 3 mouthfuls, Coupler5(27) 1 mouthful of lower end and a 6 port photoswitch OS2(45) 2 mouthfuls are connected；
The second closing optical circulator Cir2(26) 1 mouthful is connected to 4 mouthfuls of the 22 × 2nd photoswitch (45)；Described first point Road device Splitter1(38) 2 mouthfuls and the 4th common optical circulator Cir4(36) 1 mouthful is connected, and 2 mouthfuls of the circulator are connected to one A wavelengths filters WF (34), then with the second splitter Splitter2(33) it connects, the second splitter Splitter2(33) the right side Hold 1 mouthful of connection, one reflective semiconductor amplifier RSOA (31), 2 mouthfuls of right end and photoreceiver Rx1(32) it is connected；
The Coarse Wave Division Multiplexer CWDM3(43) 1 mouthful of right end and the 31 × 2nd photo-coupler Coupler2(41) 2 mouthfuls of left end company It connects；
The first closing optical circulator Cir1(23) 3 mouthfuls and third Coarse Wave Division Multiplexer CWDM1(39) left port connects, the Three Coarse Wave Division Multiplexer CWDM1(39) 3 mouthfuls of right end pass through the 21 × 2nd photo-coupler Coupler1(40) after 2 mouthfuls of right end with Four common optical circulator Cir4(36) 3 mouthfuls are connected, 1 mouthful of right end and photoswitch OS2(45) 1 mouthful is connected；
21 × 2nd photo-coupler Coupler1(40) 1 mouthful of right end and the 4th Coarse Wave Division Multiplexer CWDM2(25) left end 2 mouthfuls are connected, and the right output port of the CWDM (25) is connected to the second closing optical circulator Cir2(26) 2 mouthfuls, 3 mouthfuls of left end and third 1 × 2 photo-coupler Coupler2(41) 1 mouthful of left end is connected, Coupler2(41) right output port and 1 × 2 photoswitch OS3 (42) 1 mouthful of connection, the OS3(42) 2 mouthfuls are connected to the 51 × 2nd photo-coupler Coupler4(28) behind 1 mouthful of lower end from Coupler4(28) upper port and photoswitch OS2(45) 4 mouthfuls are connected；
The photoswitch OS3(42) 3 mouthfuls and the 41 × 2nd photo-coupler Coupler3(35) 2 mouthfuls of left end is connected, Coupler3 (35) right output port is connected to the common optical circulator Cir of 4 ports3(46) 1 mouthful, then from Cir3(46) 3 mouthfuls go out and light Transmitter Tx (29) is connected, Coupler3(35) 1 mouthful of left end is connected to photoswitch OS2(45) 5 ports；Cir3(46) 2 mouthfuls With photoreceiver Rx2(30) it connects, 4 mouthfuls and the 51 × 2nd photo-coupler Coupler4(28) 2 mouthfuls of lower end connects, in ONU (16) All CWDM (25,39,43) can mask work blue, red and yellow wave band signal wavelength, guarantee system in normal work Communication is normal under operation mode and protection operating mode.
2. the three-dimensional passive optical access network system of direct communication and protection between any ONU of realization according to claim 1, It is characterized in that, the normal mode of operation are as follows:
Wavelength Xi bjIt indicates that the wavelength works in blue zone, and is assigned to ONUi jTransmit the uplink and downlink letter under normal mode of operation Number, wavelength Xi yjMean that wavelength work is ONU in yellowish leukorrheai jInternal direct communication signal is transmitted, in the normal mode of operation, Optical sender array (2) modulates n × n blue band wavelength (λ using DPSK in central office CO (1)1 b1~λ1 bn, λ2 b1~ λ2 bn..., λn b1~λn bn) ONU (16) downstream signal wavelengths are used as, these downlink signals pass through the 1 of 1 × 2 array of photoswitch (3) Mouth is into 3 mouthfuls export to wavelength division multiplexer MUX2(19), pass through erbium-doped optical fiber amplifier EDFA after multiplexing2(20) amplify, after amplification Signal enter optical circulator Circulator2(21) 1 mouthful is exported from 2 mouthfuls again, enters OS later1(7) 2 mouthfuls are defeated from 4 mouthfuls again Out, downlink signal is transmitted to RN (11) from CO (1) along working optical fibre (9), and into after RN (11), signal is from RN (11) CWDM1(10) the port L of AWG (12) is reached after lower port output1, utilize the peri odic spectrum cycle characteristics of AWG, downlink signal Successively from port R1To RnIt exports and passes through profile fiber (14,47) and be transmitted to ONU (16), with ONU1 1(44) for, downlink letter Number (λ1 b1~λ1 bn) by photoswitch OS1(24) 1 mouthful of entrance, 3 mouthfuls of outputs, using closing optical circulator Cir1(23) and thick wave Division multiplexer CWDM3(43), splitter Splitter is subsequently entered1(38), Splitter1(38) downlink is believed by power ratio 1:1 Number it is divided into two paths of signals, signal reaches wavelength blocker WB (37) all the way, and WB (37) blocks ONU1 1(44) downstream signal wavelengths And allow ONU1 2~ONU1 n(16) downstream signal wavelengths pass through, ONU1 2~ONU1 n(16) downlink signal passes through Coupler5 (27), Cir is then arrived at2(26) 3 mouthfuls are exported from 1 mouthful again, and signal enters OS1(24) 4 mouthfuls, then from OS1(24) 2 mouthfuls are defeated Through by interconnection optical fiber (15), transversely ONU ring is transmitted to ONU clockwise after out1 2(16), and so on, until downlink signal It is transmitted to ONU1 n(16), another way signal reaches Cir4(36) 1 mouthful is exported from 2 mouthfuls again, passes through wavelength filter WF later (34), WF (34) filters out ONU1 1(44) downstream signal wavelengths simultaneously allow it to pass through, and block ONU1 2~ONU1 n(16) downlink Signal, the ONU filtered1 1(44) downlink signal again passes by splitter Splitter2(33) after, ONU1 1(44) downlink signal is divided For two paths of signals, signal is by ONU all the way1 1(44) photoreceiver Rx1(32) it receives, another way signal is injected into RSOA (31) In, RSOA (31) is by ONU1 1(44) it re-modulates after downlink signal amplification and erasing as uplink signal；
It is described with ONU1 1(44) for, uplink signal is from Cir4(36) 2 mouthfuls of inputs, then Coupler is reached after 3 mouthfuls of output1 (40), ONU is come from1 2~ONU1 n(16) uplink signal passes through OS1(24) 2 mouthfuls and 4 mouthfuls are using Cir2(26) 1 mouthful and 2 Mouth reaches CWDM2(25) 2 mouthfuls, by Coupler after output1(40), Coupler1(40) by ONU1 1(44) uplink signal and ONU1 2~ONU1 n(16) uplink signal is coupled into signal all the way, the ONU after coupling1 1~ONU1 n(16) uplink signal from CWDM1(39) 3 mouthfuls outputs, signal is from Cir later1(23) 3 mouthfuls of inputs, 1 mouthful of output, then signal reaches OS1(24) 3 mouthfuls It is exported again by 1 mouthful, is transmitted to the CWDM in RN (12) via profile fiber (14,47)2(13), uplink signal transversely ONU ring It is counterclockwise transmitted to RN (12), signal is from CWDM2(13) R of AWG (12) is reached after 2 mouthfuls of inputs1Mouthful, utilize the week of AWG Phase property partition characteristic, signal will be from the L of (12) AWG1Mouth output, passes central office CO (1) back via feeder fiber (9), in CO (1) Middle uplink signal is via photoswitch OS1(7) 4 mouthfuls are into 2 mouthfuls go out to reach optical circulator Cir2(21) 2 mouthfuls, then by Cir2(21) 3 mouthfuls go out to enter demultiplexer DMUX (17), by photoreceiver array received after demultiplexed device demultiplexing.
3. the three-dimensional passive optical access network system of direct communication and protection between any ONU of realization according to claim 1, It is characterized in that, direct communication between the ONU are as follows:
Work as ONU1 1(44) and ONU1 2(63) when communicating, ONU1 1(44) the tunable transmitter Tx (29) in will generate ONU1 2(63) Internal communication signal λ1 y2, direct communication signal λ1 y2Via optical circulator Cir3(46) 3 mouthfuls of inputs are exported from 4 mouthfuls again, are arrived Up to coupler Coupler4(28) using photoswitch OS2(45) 4 mouthfuls, signal is from photoswitch OS2(45) it is arrived after 2 mouthfuls of outputs Up to Cir2(26) 3 mouthfuls, from Cir2(26) pass through photoswitch OS after 1 mouthful of output1(24) it is transmitted to ONU1 2(63), in ONU1 2 (63) signal passes through Cir in1(52) and CWDM3(64) enter Coupler from its 1 mouthful output after2(61), signal enters photoswitch OS3(62) it is exported behind port 1 from port 3 and reaches Coupler3(60), then via Cir3(56) 1 mouthful is into 2 mouthfuls go out rear quilt ONU1 2(63) signal receiver Rx2(58) it receives；
Work as ONU1 1(44) and ONU2 1(109) it is communicated, ONU1 1(44) the tunable signal transmitter Tx (29) in generates ONU2 1 (109) direct communication signal λ2 y1, signal successively passes through Cir3(46) and Coupler4(28) OS is reached afterwards2(45) 4 mouthfuls, letter Number from OS2(45) ONU is reached along interconnection optical fiber (50,81) after 3 mouthfuls of outputs2 1OS2(87) 6 mouthfuls, from OS2(87) 5 mouthfuls Signal Coupler after output4(105) and Cir3(89) again by ONU2 1(109) the signal receiver Rx in2(100) it receives, in nothing Under the premise of needing round-trip central office CO and distant-end node RN, network completes the direct communication between an optical network unit ONU.
4. the three-dimensional passive optical access network system of direct communication and protection between any ONU of realization according to claim 1, It is characterized in that, the ONU protected mode includes feeder fiber privacy protection method, profile fiber failure protection scheme, interconnection light Three kinds of fine failure protection scheme；
The feeder fiber privacy protection method are as follows: when the feeder fiber (47) between central office CO (1) and distant-end node RN (11) It breaks down, (3) 1 mouthfuls of 1 × 2 array of photoswitch is connected with 2 mouthfuls in CO (1), and tunable transmitter array (2) is modulated using DPSK N × n red band wavelength (λ1 r1~λ1 rn, λ2 r1~λ2 rn..., λn r1~λn rn) as ONU (16) downlink signal under protected mode Wavelength, by optical multiplexer MUX1(4), EDFA1(5) and Circulator1(6) enter OS afterwards1(7), OS1(7) 1 mouthful with 3 mouthfuls It is connected, signal, which will be switched in backup path, is transmitted to CWDM in RN (11) using protection optical fiber (8)2(13), signal from The R of AWG (12)1Mouth is into using the peri odic spectrum cycle characteristics of AWG, downlink signal is successively from L1Mouthful to LnMouth exports and by dividing Cloth optical fiber (14,47) is transmitted to ONU (16), the uplink and downlink signals of uplink and downlink signals transmission direction and normal mode of operation lower network Transmission direction is on the contrary, network communication is restored, under protected mode, with ONU1 n(127) for, downlink signal passes through profile fiber (114) OS is reached1(112) 2 mouthfuls, then exported from 3 mouthfuls, signal successively passes through Cir1(111), CWDM3(126) and Splitter1 (123) it is divided into two paths of signals after, passes through Cir all the way4(121), WF (120) and Splitter2(119) Rx is reached1(118) and RSOA (117) completes downstream signal reception and remodulates；Another way passes through WB (122), Coupler5(116) and Cir2(115) Reach OS1(112) 4 mouthfuls, from OS1(112) 4 mouthfuls go out into 1 mouthful, reach ONU via interconnection optical fiber (110)1 (n-1)(16), successively Analogize, until downlink signal is sent to ONU1 1(44), restore communication, ONU1 n(127) RSOA (117) in will be received down The readjustment of row signal is made as uplink signal, which passes through Splitter2(119), WF (120) and Cir4(121) pass through again Coupler1(125), ONU is come from1 1~ONU1 (n-1)(16) uplink signal passes through OS1(112) 1 mouthful and 4 mouthfuls arrival Cir2 (115), signal is from Cir2(115) 1 mouthful of input reaches CWDM from 2 mouthfuls of outputs again2(113), it works in the uplink signal of red wave band From CWDM2(113) 1 mouthful of output reaches Coupler1(125), Coupler1(125) by ONU1 n(127) uplink signal and ONU1 1~ONU1 (n-1)(16) uplink signal is coupled into signal all the way, and the signal after coupling passes through Cir1(111) and OS1 (112), from OS1(112) through being sent to the CWDM of (11) RN by profile fiber (114) after 2 mouthfuls of outputs2(13), it then reaches The L of AWG (12)1Mouthful, using the periodic allocation characteristic of AWG, signal will be from the R of (12) AWG1Mouth output, via protection optical fiber (8) central office CO (1) is passed back, via photoswitch OS1(7) 3 mouthfuls go out into 1 mouthful, using optical circulator Circulator1(6) 2 mouthfuls into 3 mouthfuls go out, by coupler Coupler1(18) and after optical demultiplexer DMUX (17) it is connect by array acceptor Rx (22) It receives, completes uplink signal and restore；
The profile fiber failure protection scheme are as follows: when profile fiber (14,47) breaks down, in protected mode, protect Protection mechanism is identical as feeder fiber error protection, and (3) 1 mouthfuls of 1 × 2 array of photoswitch is connected with 2 mouthfuls in CO (1), tunable transmitting Machine array (2) is using n × n red band wavelength (λ of DPSK modulation1 r1~λ1 rn, λ2 r1~λ2 rn..., λn r1~λn rn) as protection ONU (16) downstream signal wavelengths, the uplink and downlink signals of uplink and downlink signals transmission direction and normal mode of operation lower network under mode Transmission direction is on the contrary, network communication is restored；
The interconnection fiber failure protection scheme are as follows: when Single Point of Faliure occurs for the interconnection optical fiber (15,48,51) between ONU (16), Using fault point as separation, lateral ONU ring is divided into semi-ring, upper half ring ONU up and down and is in normal mode of operation, and lower semi-ring ONU is then ONU uplink and downlink signals of the ONU uplink and downlink signals work under blue wave band, protected mode in protected mode, under normal mode In red wave band, which can equally provide the multipoint fault protection of interconnection optical fiber, multipoint fault protection mechanism and single-point for work Failure is identical, if ONU1 1(44) and ONU1 2(63) direct communication, then ONU1 1(44) ONU will be loaded with1 2(63) direct communication signal Wavelength X1 y2ONU is transmitted to via longitudinal interconnection optical fiber (50,81)2 1(109) 6 mouthfuls of OS2 (87) go out from 1 mouthful of OS2 (87), Go out via 1 mouthful of CWDM1 (128) into left port, by closing optical circulator Cir1(80) 3 mouthfuls go out into 1 mouthful, pass through OS1(82) 3 mouthfuls into 2 mouthfuls go out, using laterally interconnection optical fiber (84,129) be sent to ONU2 2(140) OS1(131) 1 mouthful, from OS1 (131) 4 mouthfuls go out, by Cir2(133) and CWDM2(132), from CWDM2(132) 3 mouthfuls go out, and pass through Coupler2(138) after Via OS3(139) 1 mouthful goes out into 2 mouthfuls, by Coupler4(136), from OS2(135) 4 mouthfuls go out into 6 mouthfuls, finally using vertical ONU is transmitted to interconnection optical fiber (59,130)1 2(63) OS2(54) 3 mouthfuls, 5 mouthfuls go out to enter Coupler3(60), via Cir3 (56) 1 mouthful goes out into 2 mouthfuls, finally by photoreceiver Rx2(58) it receives, completes signal and restore.
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