CN102769807B

CN102769807B - Centralization light source orthogonal frequency division multiplexing passive optical network system and transmission method

Info

Publication number: CN102769807B
Application number: CN201210236411.1A
Authority: CN
Inventors: 汤磊; 伍仕宝; 李玉龙; 鹿宏柯
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2012-07-10
Filing date: 2012-07-10
Publication date: 2015-10-07
Anticipated expiration: 2032-07-10
Also published as: CN102769807A

Abstract

The present invention relates to a kind of centralization light source orthogonal frequency division multiplexing passive optical network system and transmission method.Adopt 1 central local side in system, through two erbium-doped fiber amplifiers, by two-way optical fiber link remote node of the connection, and distant-end node connects N number of optical network unit group be made up of two optical network units.Wherein, central local side is by 2 external-cavity semiconductor laser, 2 comb δ function formula generators, N 2 Mach zehnder modulators, N 2 upward signal receivers, N 2 circulators and two N 1 circular array waveguide optical grating composition; Distant-end node only comprises 21 n circular array waveguide optical grating.Central authorities' local side adopts comb δ function formula generator, light source obtain centralized management simultaneously cost have also been obtained reduction.Two comb δ function formula generator and cross modulation optical network unit groups being operated in different-waveband are adopted in the present invention, not only achieve the reduction of the centralization of central local side light source and up-downgoing business transmission crosstalk noise simultaneously, and make system reach equilibrium between cost and performance.

Description

Centralization light source orthogonal frequency division multiplexing passive optical network system and transmission method

Technical field

The present invention relates to optical communication field, specifically relate to a kind of centralization light source orthogonal frequency division multiplexing passive optical network (OFDM-PON) system and transmission method.

Background technology

Access Network as the bridge of user side and metropolitan area network/backbone network, development rapidly, particularly optical access network.In recent years, the concept of a series of optical access network such as EPON, GPON, Hybrid WDM/TDM-PON, OFDM-PON is fast-developing.Access network technology based on light OFDM (OFDM) can carry out the division of time domain and frequency domain resource neatly, has caused the concern of numerous researcher and communication equipment business.Light OFDM spectrum efficiency is high, and capacity is large, can realize varigrained scheduling of resource, can meet service quality (QOS) and the bandwidth demand of different business.Access Network based on light OFDM not only can realize jumbo soft exchange, and can realize wireless and Wired access mode seamless fusion, can also compatible existing optical access network, realize dynamic reconfigurable network and then reduce cost.In addition, it also has broad application prospects in the access of long distance.Wave division multiplexing passive optical network WDM-PON technology can when not changing physical basis framework upgrade bandwidth, significantly promote the transmission capacity of network, realize virtual point-to-point transmission, there is natural fail safe.The present invention utilizes the advantage of existing WDN-PON, in conjunction with the advantage of light OFDM, carried out rational deployment to the framework of system, system not only can realize the centralized management of light source to reduce cost, and can reduce the crosstalk noise of optical fiber link and Rayleigh scattering to the impact of signal.

Summary of the invention

The object of the invention is to the defect existed for prior art, provide a kind of centralization light source orthogonal frequency division multiplexing passive optical network (OFDM-PON) system and transmission method, effectively can realize the impact that light source centerization management reduces crosstalk noise and Rayleigh scattering simultaneously.

For achieving the above object, design of the present invention is: central local side CO adopts two external-cavity semiconductor laser to drive two comb δ function formula generator OFCG, produces the light carrier being in different-waveband and realizes light source centerization management; Two optical network units in optical network unit group ONU Group adopt cross modulation mode can realize the decolorizable of optical network unit, and the cost greatly reducing system reduces the crosstalk of signal simultaneously.

According to foregoing invention design, the present invention adopts following scheme:

A kind of centralization light source orthogonal frequency division multiplexing passive optical network system, the first optical fiber link and the second optical fiber link remote node of the connection RN is passed through through the first erbium-doped optical fiber amplifier EDFA 1 and the second erbium-doped optical fiber amplifier EDFA 2 by central local side CO, and distant-end node RN connects the optical network unit group ONU Group be made up of two optical network unit ONU, it is characterized in that: the central local side CO 1) is that the first external-cavity semiconductor laser is connected the first comb δ function formula generator OFCG1 and the second comb δ function formula generator OFCG2 respectively with the second external-cavity semiconductor laser; The N number of wavelength output port of first comb δ function formula generator OFCG1 connects first group N number of Mach zehnder modulators MZM respectively, first group N number of Mach zehnder modulators MZM signal drives port to be connected with MAC layer, first group N number of Mach zehnder modulators MZM signal output port is connected with first group of N number of circulator respectively, first group of N number of circulator port is connected with first group of N number of upward signal receiver, first group of N number of circulator another one port and a N 1 circular array waveguide optical grating AWG1 is connected, a N 1 circular array waveguide optical grating AWG1 is connected with the first erbium-doped optical fiber amplifier EDFA 1; First group of N number of upward signal receiver signal output port is connected with MAC layer; The N number of wavelength output port of second comb δ function formula generator OFCG2 connects second group N number of Mach zehnder modulators MZM(16 respectively), second group N number of Mach zehnder modulators MZM(16) signal drive port be connected with MAC layer, second group N number of Mach zehnder modulators MZM signal output port is connected with second group of N number of circulator respectively, second group of N number of circulator port is connected with second group of N number of upward signal receiver, second group of N number of circulator another one port and the 2nd N 1 circular array waveguide optical grating AWG2 is connected, the 2nd N 1 circular array waveguide optical grating AWG2 is connected with the second erbium-doped optical fiber amplifier EDFA 2; Second group of upward signal receiver signal output port is connected with MAC layer; 2) distant-end node comprises the 31 n circular array waveguide optical grating AWG3 and the 41 n circular array waveguide optical grating AWG4 two circular array waveguide optical grating AWG, these two circular array waveguide optical grating AWG connect N number of optical network unit group ONU Group be made up of two optical network units; 3) optical network unit group is made up of the first optical network unit ONU and the second optical network unit ONU two optical network units: the first port of first power splitter is connected the 31 n circular array waveguide optical grating AWG3 port, second port of this first power splitter connects first circulator, and the 3rd port of this first power splitter connects a second reflective semiconductor optical amplifier RSOA in the second optical network unit ONU; First port of second power splitter connects the 41 n circular array waveguide optical grating AWG4 port, second port of this second power splitter connects second circulator, and the 3rd port of this second power splitter connects a first reflective semiconductor optical amplifier RSOA in the first optical network unit ONU; A first downstream signal reception device is connected with the first circulator, and a second downstream signal reception device is connected with the second circulator.

A kind of centralization light source orthogonal frequency division multiplexing passive optical network transmission method, adopts said system to transmit, it is characterized in that: the first external-cavity semiconductor laser in described central local side CO and the second external-cavity semiconductor laser simultaneously respectively emission wavelength be with planting light, producing N number of carrier wave respectively for driving the first comb δ function formula generator OFCG1 and the second comb δ function formula generator OFCG2, the first comb δ function formula generator OFCG1 and the second comb δ function formula generator OFCG2 ~ with ~ , these two groups of N carrier phase difference N FSR doubly, the benefit done like this utilizes circulating duct grating AWG, the port that can pass through also can pass through; Produced by the first comb δ function formula generator OFCG1 ~ carrier wave sends into the carrier wave entrance of first group N number of Mach zehnder modulators MZM respectively, and the signal input port of first group N number of Mach zehnder modulators MZM is driven by MAC layer; Produced by the second comb δ function formula generator OFCG2 ~ carrier wave sends into second group N number of Mach zehnder modulators MZM respectively, and second group N number of Mach zehnder modulators MZM signal input port is driven by MAC layer; The signal modulated is linked into first group of N number of circulator and second group of N number of circulator by first group N number of Mach zehnder modulators MZM and second group of N number of Mach of zehnder modulators MZM respectively, eventually passes a N 1 circular array waveguide optical grating AWG1 and the 2nd N after the first erbium-doped optical fiber amplifier EDFA 1 and the second erbium-doped optical fiber amplifier EDFA 2 optical signal amplification, the first optical fiber link is injected and the second optical fiber link transmits after 1 circular array waveguide optical grating AWG2 is multiplexing; First optical fiber link and the second optical fiber link distinguish the 31 in remote node of the connection RN n circular array waveguide optical grating AWG3 and the 41 n circular array waveguide optical grating AWG4, in the first optical fiber link and the second optical fiber link, composite signal is through the 31 n circular array waveguide optical grating AWG3 and the 41 optical network unit group ONU Group is sent to after N circular array waveguide optical grating AWG4 demultiplexing; 31 first through the first power splitter, downstream signal is divided into two-way after N circular array waveguide optical grating AWG3 demultiplexed signal enters optical network unit group ONU Group: the up-link carrier of the second reflective semiconductor optical amplifier RSOA as the second optical network unit ONU is given on a road, the upward signal that the upward signal modulated through the second reflective semiconductor optical amplifier RSOA is modulated by the second circulator and other is the 41 aWG4 is multiplexing for N circular array waveguide optical grating; Other road first circulator is given the first downstream signal reception device and is carried out signal receiving; 41 first through the second power splitter, downstream signal is divided into two-way after N circular array waveguide optical grating AWG3 demultiplexed signal enters optical network unit group ONU Group: the up-link carrier of the first reflective semiconductor optical amplifier RSOA as the first optical network unit ONU is given on a road, the upward signal that the upward signal modulated through the first reflective semiconductor optical amplifier RSOA is modulated by the first circulator and other is the 31 aWG3 is multiplexing for N circular array waveguide optical grating; Other road second circulator is given the second downstream signal reception device and is carried out signal receiving.

The present invention compared with prior art, has following apparent feature and remarkable advantage: 1) system utilizes OFDM modulation technology greatly can increase the capacity of system; 2) native system proposes and adopts comb δ function formula generator to produce light carrier at central local side, light source centralized management 3 can be realized) native system to propose in optical network unit group optical network unit and adopts cross modulation, optical fiber link uplink and downlink carrier wave is in different frequency ranges mutually, can reduce the impact of crosstalk noise and Rayleigh scattering like this.

Accompanying drawing explanation

Fig. 1 is centralization light source orthogonal frequency division multiplexing passive optical network (OFDM-PON) system configuration schematic diagram of the present invention.

Fig. 2 is system optical network unit group structural representation in Fig. 1.

Embodiment

Accompanying drawings, exemplifying embodiment of the present invention is as follows:

Embodiment one:

See Fig. 1 ~ Fig. 2, this centralization light source orthogonal frequency division multiplexing passive optical network system, by central local side CO(1) through the first erbium-doped optical fiber amplifier EDFA 1(9) and the second erbium-doped optical fiber amplifier EDFA 2(20) by the first optical fiber link (10) and the second optical fiber link (21) remote node of the connection RN(11), and distant-end node RN(11) connect the optical network unit group ONU Group(13 be made up of two optical network unit ONU).Central authorities local side CO(1) be that the first external-cavity semiconductor laser (2) is connected the first comb δ function formula generator OFCG1(4 respectively with the second external-cavity semiconductor laser (14)) and the second comb δ function formula generator OFCG2(15); First comb δ function formula generator OFCG1(4) N number of wavelength output port connects first group N number of Mach zehnder modulators MZM(5 respectively), first group N number of Mach zehnder modulators MZM(5) signal drives port and MAC layer (3), first group N number of Mach zehnder modulators MZM(5) signal output port is connected with first group of N number of circulator (7) respectively, first group of N number of circulator (7) ports are connected with first group of N number of upward signal receiver (6), first group of N number of circulator (7) another one port and a N 1 circular array waveguide optical grating AWG1(8) be connected, a N 1 circular array waveguide optical grating AWG1(8) with the first erbium-doped optical fiber amplifier EDFA 1(9) be connected; First group of N number of upward signal receiver (6) signal output port is connected with MAC layer (3); Second comb δ function formula generator OFCG2(15) N number of wavelength output port connects second group N number of Mach zehnder modulators MZM(16 respectively), second group of Mach zehnder modulators MZM(16) signal drives port and MAC layer (3), second group of Mach zehnder modulators MZM(16) signal output port is connected with second group of N number of circulator (17) respectively, second group of N number of circulator (17) ports are connected with second group of N number of upward signal receiver (18), second group of N number of circulator (17) another one port and the 2nd N 1 circular array waveguide optical grating AWG2(19) be connected, the 2nd N 1 circular array waveguide optical grating AWG2(19) with the second erbium-doped optical fiber amplifier EDFA 2(20) be connected; Second group of upward signal receiver (18) signal output port is connected with MAC layer (3); Distant-end node (11) comprises the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22) two circular array waveguide optical grating AWG, these two circular array waveguide optical grating AWG connect N number of optical network unit group ONU Group(13 be made up of two optical network units); Optical network unit group (13) is made up of the first optical network unit ONU (27) and the second optical network unit ONU (32) two optical network units: the first port of first power splitter (23) is connected the 31 n circular array waveguide optical grating AWG3(12) port, second port of this first power splitter (23) connects first circulator (24), and the 3rd port of this first power splitter (23) connects a second reflective semiconductor optical amplifier RSOA(31 in the second optical network unit ONU (32)); First port of second power splitter (28) connects the 41 n circular array waveguide optical grating AWG4(22) port, second port of this second power splitter (28) connects second circulator (29), and the 3rd port of this second power splitter (28) connects a first reflective semiconductor optical amplifier RSOA(26 in first optical network unit ONU (27)); A first downstream signal reception device (25) is connected with the first circulator (24), and a second downstream signal reception device (30) is connected with the second circulator (29).

Embodiment two:

See Fig. 1 ~ Fig. 2, this centralization light source orthogonal frequency division multiplexing passive optical network transmission method, adopt said system realize light source centralized management, described central local side CO(1) in the first external-cavity semiconductor laser (2) and the second external-cavity semiconductor laser (14) simultaneously respectively emission wavelength be with plant light, for driving the first comb δ function formula generator OFCG1(4) and the second comb δ function formula generator OFCG2(15), the first comb δ function formula generator OFCG1(4) and the second comb δ function formula generator OFCG2(15) produce N number of carrier wave respectively ~ with ~ , these two groups of N carrier phase difference N FSR doubly, the benefit done like this utilizes circulating duct grating AWG, the port that can pass through also can pass through; By the first comb δ function formula generator OFCG1(4) produce ~ carrier wave sends into first group N number of Mach zehnder modulators MZM(5 respectively) carrier wave entrance, first group N number of Mach zehnder modulators MZM(5) signal input port driven by MAC layer (3); By the second comb δ function formula generator OFCG2(15) produce ~ carrier wave sends into second group N number of Mach zehnder modulators MZM(16 respectively), second group N number of Mach zehnder modulators MZM(16) signal input port drives by MAC layer (3); The signal modulated is respectively by first group N number of Mach zehnder modulators MZM(5) and second group N number of Mach zehnder modulators MZM(16) be linked into first group of N number of circulator (7) and second group of N number of circulator (17), eventually pass a N 1 circular array waveguide optical grating AWG1(8) and the 2nd N 1 circular array waveguide optical grating AWG2(19) multiplexing after through the first erbium-doped optical fiber amplifier EDFA 1(9) and the second erbium-doped optical fiber amplifier EDFA 2(20) inject the first optical fiber link (10) after optical signal amplification and the second optical fiber link (21) transmits; First optical fiber link (10) and the second optical fiber link (21) be remote node of the connection RN(11 respectively) in the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22), the first optical fiber link (10) and the middle composite signal of the second optical fiber link (21) are through the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22) be sent to optical network unit group ONU Group(13 after demultiplexing); 31 n circular array waveguide optical grating AWG3(12) demultiplexed signal enters optical network unit group ONU Group(13) first through the first power splitter (23), downstream signal is divided into two-way afterwards: the second reflective semiconductor optical amplifier RSOA(31 is given on a road) as the up-link carrier of the second optical network unit ONU (32), through the second reflective semiconductor optical amplifier RSOA(31) upward signal that modulates by the second circulator (29) with other upward signals modulated the 41 n circular array waveguide optical grating AWG4(22) multiplexing; An other road first circulator (24) is given the first downstream signal reception device (25) and is carried out signal receiving; 41 n circular array waveguide optical grating AWG3(22) demultiplexed signal enters optical network unit group ONU Group(13) first through the second power splitter (28), downstream signal is divided into two-way afterwards: the first reflective semiconductor optical amplifier RSOA(26 is given on a road) as the up-link carrier of the first optical network unit ONU (27), through the first reflective semiconductor optical amplifier RSOA(26) upward signal that modulates by the first circulator (24) with other upward signals modulated the 31 n circular array waveguide optical grating AWG3(12) multiplexing; An other road second circulator (29) is given the second downstream signal reception device (30) and is carried out signal receiving.

Claims

1. a centralization light source orthogonal frequency division multiplexing passive optical network system, by central local side CO(1) through the first erbium-doped optical fiber amplifier EDFA 1(9) and the second erbium-doped optical fiber amplifier EDFA 2(20) by the first optical fiber link (10) and the second optical fiber link (21) remote node of the connection RN(11), and distant-end node RN(11) connect the optical network unit group ONU Group(13 be made up of two optical network unit ONU), it is characterized in that:

1) the central local side CO(1 described in) in the first external-cavity semiconductor laser (2) be connected the first comb δ function formula generator OFCG1(4 respectively with the second external-cavity semiconductor laser (14)) and the second comb δ function formula generator OFCG2(15); First comb δ function formula generator OFCG1(4) N number of wavelength output port connects first group of Mach zehnder modulators MZM(5 respectively), first group N number of Mach zehnder modulators MZM(5) signal drive port be connected with MAC layer (3), first group N number of Mach zehnder modulators MZM(5) signal output port is connected with first group of N number of circulator (7) respectively, first group of N number of circulator (7) ports are connected with first group of N number of upward signal receiver (6), first group of N number of circulator (7) another one port and a N 1 circular array waveguide optical grating AWG1(8) be connected, a N 1 circular array waveguide optical grating AWG1(8) with the first erbium-doped optical fiber amplifier EDFA 1(9) be connected; First group of N number of upward signal receiver (6) signal output port is connected with MAC layer (3);

Second comb δ function formula generator OFCG2(15) N number of wavelength output port connects second group N number of Mach zehnder modulators MZM(16 respectively), second group N number of Mach zehnder modulators MZM(16) signal drive port be connected with MAC layer (3), second group N number of Mach zehnder modulators MZM(16) signal output port is connected with second group of N number of circulator (17) respectively, second group of N number of circulator (17) ports are connected with second group of N number of upward signal receiver (18), second group of N number of circulator (17) another one port and the 2nd N 1 circular array waveguide optical grating AWG2(19) be connected, the 2nd N 1 circular array waveguide optical grating AWG2(19) with the second erbium-doped optical fiber amplifier EDFA 2(20) be connected; Second group of N number of upward signal receiver (18) signal output port is connected with MAC layer (3);

2) described distant-end node RN(11) comprise the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22) two circular array waveguide optical grating AWG, these two circular array waveguide optical grating AWG connect N number of optical network unit group ONU Group(13 be made up of two optical network units);

3) described optical network unit group ONU Group(13) be made up of the first optical network unit ONU (27) and the second optical network unit ONU (32) two optical network units: the first port of first power splitter (23) is connected the 31 n circular array waveguide optical grating AWG3(12) port, second port of this first power splitter (23) connects first circulator (24), and this first power splitter (23) the 3rd port connects a second reflective semiconductor optical amplifier RSOA(31 in the second optical network unit ONU (32)); First port of second power splitter (28) connects the 41 n circular array waveguide optical grating AWG4(22) port, second port of this second power splitter (28) connects second circulator (29), and the 3rd port of this second power splitter (28) connects a first reflective semiconductor optical amplifier RSOA(26 in the first optical network unit ONU (27)); A first downstream signal reception device (25) is connected with first circulator (24), and a second downstream signal reception device (30) is connected with the second circulator (29).

2. a centralization light source orthogonal frequency division multiplexing passive optical network transmission method, adopt centralization light source orthogonal frequency division multiplexing passive optical network system according to claim 1 realize light source centerization transmission, it is characterized in that: described central local side CO(1) in the first external-cavity semiconductor laser (2) and the second external-cavity semiconductor laser (14) simultaneously respectively emission wavelength be with light, for driving the first comb δ function formula generator OFCG1(4) and the second comb δ function formula generator OFCG2(15), the first comb δ function formula generator OFCG1(4) and the second comb δ function formula generator OFCG2(15) produce N number of carrier wave respectively ~ with ~ , these two groups of N carrier phase difference N FSR doubly, the benefit done like this utilizes circulating duct grating AWG, the port that can pass through also can pass through; By the first comb δ function formula generator OFCG1(4) produce ~ carrier wave sends into first group N number of Mach zehnder modulators MZM(5 respectively) carrier wave entrance, first group N number of Mach zehnder modulators MZM(5) signal input port driven by MAC layer (3); By the second comb δ function formula generator OFCG2(15) produce ~ carrier wave sends into second group N number of Mach zehnder modulators MZM(16 respectively), second group N number of Mach zehnder modulators MZM(16) signal input port drives by MAC layer (3); The signal modulated is respectively by first group N number of Mach zehnder modulators MZM(5) and second group N number of Mach zehnder modulators MZM(16) be linked into first group of N number of circulator (7) and second group of N number of circulator (17), eventually pass a N 1 circular array waveguide optical grating AWG1(8) and the 2nd N 1 circular array waveguide optical grating AWG2(19) multiplexing after through the first erbium-doped optical fiber amplifier EDFA 1(9) and the second erbium-doped optical fiber amplifier EDFA 2(20) inject the first optical fiber link (10) after optical signal amplification and the second optical fiber link (21) transmits; First optical fiber link (10) and the second optical fiber link (21) be remote node of the connection RN(11 respectively) in the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22), the first optical fiber link (10) and the middle composite signal of the second optical fiber link (21) are through the 31 n circular array waveguide optical grating AWG3(12) and the 41 n circular array waveguide optical grating AWG4(22) be sent to optical network unit group ONU Group(13 after demultiplexing); 31 n circular array waveguide optical grating AWG3(12) demultiplexed signal enters the optical network unit group ONU Group(13 be made up of two optical network units) first through the first power splitter (23), downstream signal is divided into two-way afterwards: the second reflective semiconductor optical amplifier RSOA(31 is given on a road) as the up-link carrier of the second optical network unit ONU (32), through the second reflective semiconductor optical amplifier RSOA(31) upward signal that modulates by the second circulator (29) with other upward signals modulated the 41 n circular array waveguide optical grating AWG4(22) multiplexing; An other road first circulator (24) is given the first downstream signal reception device (25) and is carried out signal receiving; 41 n circular array waveguide optical grating AWG3(22) demultiplexed signal enters optical network unit group ONU Group(13) first through the second power splitter (28), downstream signal is divided into two-way afterwards: the first reflective semiconductor optical amplifier RSOA(26 is given on a road) as the up-link carrier of the first optical network unit ONU (27), through the first reflective semiconductor optical amplifier RSOA(26) upward signal that modulates by the first circulator (24) with other upward signals modulated the 31 n circular array waveguide optical grating AWG3(12) multiplexing; An other road second circulator (29) is given the second downstream signal reception device (30) and is carried out signal receiving.