CN102769807A - Light source centralization orthogonal frequency division multiplexing passive optical network system and transmission method - Google Patents
Light source centralization orthogonal frequency division multiplexing passive optical network system and transmission method Download PDFInfo
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Abstract
The invention relates to a light source centralization orthogonal frequency division multiplexing passive optical network system and a transmission method. According to the system, a center office is connected with a remote node through two erbium-doped fiber amplifiers and two optical fiber links, and the remote node is connected with N optical network unit groups of which each consists of two optical network units, wherein the center office consists of two external cavity semiconductor lasers, two comb-shaped spectrum generators, N*2 Mach-Zehnder modulators, N*2 uplink signal receivers, N*2 circulators and two N*1 circulating arrayed waveguide gratings; and the remote node only comprises two 1*N circulating arrayed waveguide gratings. The comb-shaped spectrum generators are used for the center office, so that light sources are managed in a centralized way, and cost is also lowered. The two comb-shaped spectrum generators working in different bands and the cross-modulation optical network unit groups are adopted, so that the centralization of the light sources of the center office is realized, uplink and downlink service transmission crosstalk noise is lowered, and the cost and performance of the system are balanced.
Description
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 is as the bridge of user side and metropolitan area network/backbone network, and development is rapid, particularly optical access network.In recent years, the notion of a series of optical access networks such as EPON, GPON, Hybrid WDM/TDM-PON, OFDM-PON is fast-developing.Hand over the access network technology of frequency division multiplexing (OFDM) can carry out the division of time domain and frequency domain resource neatly based on light positive, caused numerous researchers and communication equipment merchant's concern.Light OFDM spectrum efficiency is high, and capacity is big, can realize varigrained scheduling of resource, can satisfy the service quality (QOS) and the bandwidth demand of different business.Can realize not only that based on the Access Network of light OFDM jumbo light inserts, and can realize wireless and the seamless fusion that line access mode is arranged, can also compatible existing optical access network, realize the dynamic reconfigurable network and then reduce cost.In addition, it also has broad application prospects aspect access long.The Wave division multiplexing passive optical network WDM-PON technology bandwidth of can under the situation that does not change the physical basis framework, upgrading promotes the transmission capacity of network significantly, realizes virtual point-to-point transmission, has natural fail safe.The present invention utilizes the advantage of existing WDN-PON; Advantage in conjunction with light OFDM; Framework to system has carried out rational deployment, and the centralized management that system not only can realize light source to be reducing cost, and can reduce the influence to signal of crosstalk noise and the Rayleigh scattering of optical fiber link.
Summary of the invention
The objective of the invention is to defective to the prior art existence; A kind of centralization light source orthogonal frequency division multiplexing passive optical network (OFDM-PON) system and transmission method are provided, can have realized effectively that the light source center management reduces the influence of crosstalk noise and Rayleigh scattering simultaneously.
For achieving the above object, design of the present invention is: central local side CO adopts two ECLDs to drive two pectination spectrum generator OFCG, produces the light carrier that is in different-waveband and realizes the light source center management; Two optical network units among the optical network unit group ONU Group adopt the cross modulation mode can realize colourlessization of optical network unit, and the cost that reduces system greatly reduces crosstalking of signal simultaneously.
According to the foregoing invention design, the present invention adopts following scheme:
A kind of centralization light source orthogonal frequency division multiplexing passive optical network system; Pass through first optical fiber link and the second optical fiber link remote node of the connection RN by central local side CO through the first erbium-doped fiber amplifier EDFA1 and the second erbium-doped fiber amplifier EDFA2; And distant-end node RN connects the optical network unit group ONU Group that is made up of two optical network unit ONU, and it is characterized in that: 1) described central local side CO is that first ECLD is connected the first pectination spectrum generator OFCG1 and the second pectination spectrum generator OFCG2 respectively with second ECLD; N wavelength output port of the first pectination spectrum generator OFCG1 connects first group N Mach zehnder modulators MZM respectively; First group N Mach zehnder modulators MZM signal drive ports links to each other with the MAC layer; First group N Mach zehnder modulators MZM signal output port links to each other with first group of N circulator respectively; Port of first group of N circulator links to each other with first group of N upward signal receiver; First group N circulator another one port links to each other with a N
1 circular array waveguide optical grating AWG1, and a N
1 circular array waveguide optical grating AWG1 links to each other with the first erbium-doped fiber amplifier EDFA1; First group N upward signal receiver signal output port links to each other with the MAC layer; N wavelength output port of the second pectination spectrum generator OFCG2 connects second group N Mach zehnder modulators MZM (16) respectively; Second group N Mach zehnder modulators MZM (16) signal drive ports links to each other with the MAC layer; Second group N Mach zehnder modulators MZM signal output port links to each other with second group of N circulator respectively; Port of second group of N circulator links to each other with second group of N upward signal receiver; Second group N circulator another one port links to each other with the 2nd N
1 circular array waveguide optical grating AWG2, and the 2nd N
1 circular array waveguide optical grating AWG2 links to each other with the second erbium-doped fiber amplifier EDFA2; Second group of upward signal receiver signal output port links to each other with the MAC layer; 2) distant-end node comprise the 31
N circular array waveguide optical grating AWG3 and the 41
two circular array waveguide optical gratings of N circular array waveguide optical grating AWG4 AWG, these two circular array waveguide optical grating AWG connect N optical network unit group ONU Group that are made up of two optical network units; 3) the optical network unit group is made up of two optical network units of first optical network unit ONU and second optical network unit ONU: first port of one first power splitter be connected the 31
port of N circular array waveguide optical grating AWG3; Second port of this first power splitter connects one first circulator, and the 3rd port of this first power splitter connects one second reflective semiconductor optical amplifier RSOA in second optical network unit ONU; First port of one second power splitter connect the 41
port of N circular array waveguide optical grating AWG4; Second port of this second power splitter connects one second circulator, and the 3rd port of this second power splitter connects one first reflective semiconductor optical amplifier RSOA in first optical network unit ONU; One first downstream signal receiver links to each other with first circulator, and one second downstream signal receiver links to each other with second circulator.
A kind of centralization light source orthogonal frequency division multiplexing passive optical network transmission method; Adopt said system to transmit; It is characterized in that: first ECLD among the described central local side CO and second ECLD are distinguished emission wavelength simultaneously and are planted light for
and
; Be used to drive the first pectination spectrum generator OFCG1 and the second pectination spectrum generator OFCG2; The first pectination spectrum generator OFCG1 and the second pectination spectrum generator OFCG2 produce N carrier wave
~
and
~
respectively; These two groups of N carrier waves differ N FSR doubly; The benefit of doing like this is to utilize circulating duct grating AWG, and the port that
can pass through
also can pass through; The carrier wave of being sent into first group N Mach zehnder modulators MZM by
~
carrier wave of first pectination spectrum generator OFCG1 generation respectively enters the mouth, and the signal input port of first group N Mach zehnder modulators MZM is driven by the MAC layer;
~
carrier wave by the second pectination spectrum generator OFCG2 produces is sent into second group N Mach zehnder modulators MZM respectively, and second group N Mach zehnder modulators MZM signal input port driven by the MAC layer; The signal that modulates is linked into first group of N circulator and second group of N circulator by first group N Mach zehnder modulators MZM and second group N Mach zehnder modulators MZM respectively, transmits through injection first optical fiber link and second optical fiber link after the first erbium-doped fiber amplifier EDFA1 and the amplification of the second erbium-doped fiber amplifier EDFA2 light signal after multiplexing through a N
1 circular array waveguide optical grating AWG1 and the 2nd N
1 circular array waveguide optical grating AWG2 at last; First optical fiber link and second optical fiber link respectively the 31
among the remote node of the connection RNN circular array waveguide optical grating AWG3 and the 41
N circular array waveguide optical grating AWG4, in first optical fiber link and second optical fiber link composite signal through the 31
N circular array waveguide optical grating AWG3 and the 41
be sent to optical network unit group ONU Group behind the N circular array waveguide optical grating AWG4 demultiplexing; The the 31
N circular array waveguide optical grating AWG3 demultiplexed signal is divided into two-way through first power splitter with downstream signal earlier after getting into optical network unit group ONU Group: the one tunnel gives the second reflective semiconductor optical amplifier RSOA up-link carrier as second optical network unit ONU, the upward signal that modulates through the second reflective semiconductor optical amplifier RSOA through second circulator and other upward signals that modulates the 41
AWG4 is multiplexing for N circular array waveguide optical grating; Other one the tunnel gives the first downstream signal receiver through first circulator carries out the signal demodulation; The the 41
N circular array waveguide optical grating AWG3 demultiplexed signal is divided into two-way through second power splitter with downstream signal earlier after getting into optical network unit group ONU Group: the one tunnel gives the first reflective semiconductor optical amplifier RSOA up-link carrier as first optical network unit ONU, the upward signal that modulates through the first reflective semiconductor optical amplifier RSOA through first circulator and other upward signals that modulates the 31
AWG3 is multiplexing for N circular array waveguide optical grating; Other one the tunnel gives the second downstream signal receiver through second circulator carries out the signal demodulation.
The present invention has following conspicuous characteristics and remarkable advantage compared with prior art: 1) system utilizes the OFDM modulation technique can greatly increase the capacity of system; 2) native system has proposed to adopt pectination spectrum generator to produce light carrier at central local side; Can realize light source centralized management 3) native system proposed in the optical network unit group optical network unit and adopted cross modulation; Optical fiber link uplink and downlink carrier wave is in different frequency ranges each other, can reduce the influence of crosstalk noise and Rayleigh scattering like this.
Description of drawings
Fig. 1 is centralization light source orthogonal frequency division multiplexing passive optical network of the present invention (the system configuration sketch map of OFDM-PON).
Fig. 2 is system's optical network unit group structural representation among Fig. 1.
Embodiment
Accompanying drawings, exemplifying embodiment of the present invention is following:
Embodiment one:
Referring to Fig. 1 ~ Fig. 2; This centralization light source orthogonal frequency division multiplexing passive optical network system; Pass through first optical fiber link (10) and second optical fiber link (21) remote node of the connection RN (11) by central local side CO (1) through the first erbium-doped fiber amplifier EDFA1 (9) and the second erbium-doped fiber amplifier EDFA2 (20), and distant-end node RN (11) connects the optical network unit group ONU Group (13) that is made up of two optical network unit ONU.The local side CO of central authorities (1) are that first ECLD (2) is connected the first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15) respectively with second ECLD (14); N wavelength output port of the first pectination spectrum generator OFCG1 (4) connects first group N Mach zehnder modulators MZM (5) respectively; First group N Mach zehnder modulators MZM (5) signal drive ports and MAC layer (3); First group N Mach zehnder modulators MZM (5) signal output port links to each other with first group N circulator (7) respectively; (7) ports of first group of N circulator link to each other with first group N upward signal receiver (6); First group N circulator (7) another one port links to each other with a N
1 circular array waveguide optical grating AWG1 (8), and a N
1 circular array waveguide optical grating AWG1 (8) links to each other with the first erbium-doped fiber amplifier EDFA1 (9); First group N upward signal receiver (6) signal output port links to each other with MAC layer (3); N wavelength output port of the second pectination spectrum generator OFCG2 (15) connects second group N Mach zehnder modulators MZM (16) respectively; Second group of Mach zehnder modulators MZM (16) signal drive ports and MAC layer (3); Second group of Mach zehnder modulators MZM (16) signal output port links to each other with second group N circulator (17) respectively; (17) ports of second group of N circulator link to each other with second group N upward signal receiver (18); Second group N circulator (17) another one port links to each other with the 2nd N
1 circular array waveguide optical grating AWG2 (19), and the 2nd N
1 circular array waveguide optical grating AWG2 (19) links to each other with the second erbium-doped fiber amplifier EDFA2 (20); Second group of upward signal receiver (18) signal output port links to each other with MAC layer (3); Distant-end node (11) comprise the 31
N circular array waveguide optical grating AWG3 (12) and the 41
(22) two circular array waveguide optical grating AWG of N circular array waveguide optical grating AWG4, these two circular array waveguide optical grating AWG connect N optical network unit group ONU Group (13) that are made up of two optical network units; Optical network unit group (13) is made up of (32) two optical network units of first optical network unit ONU (27) and second optical network unit ONU: first port of one first power splitter (23) be connected the 31
(12) ports of N circular array waveguide optical grating AWG3; Second port of this first power splitter (23) connects one first circulator (24), and the 3rd port of this first power splitter (23) connects one the second reflective semiconductor optical amplifier RSOA (31) in second optical network unit ONU (32); First port of one second power splitter (28) connect the 41
(22) ports of N circular array waveguide optical grating AWG4; Second port of this second power splitter (28) connects one second circulator (29), and the 3rd port of this second power splitter (28) connects one the first reflective semiconductor optical amplifier RSOA (26) in one first optical network unit ONU (27); One first downstream signal receiver (25) links to each other with first circulator (24), and one second downstream signal receiver (30) links to each other with second circulator (29).
Embodiment two:
Referring to Fig. 1 ~ Fig. 2; This centralization light source orthogonal frequency division multiplexing passive optical network transmission method; Adopt said system to realize the light source centralized management; It is that
and
plants light that first ECLD (2) among the described central local side CO (1) and second ECLD (14) are distinguished emission wavelength simultaneously; Be used to drive the first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15); The first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15) produce N carrier wave
~
and
~
respectively; These two groups of N carrier waves differ N FSR doubly; The benefit of doing like this is to utilize circulating duct grating AWG, and the port that
can pass through
also can pass through; The carrier wave of being sent into first group N Mach zehnder modulators MZM (5) by
~
carrier wave of the first pectination spectrum generator OFCG1 (4) generation respectively enters the mouth, and the signal input port of first group N Mach zehnder modulators MZM (5) is driven by MAC layer (3);
~
carrier wave by the second pectination spectrum generator OFCG2 (15) produces is sent into second group N Mach zehnder modulators MZM (16) respectively, and second group N Mach zehnder modulators MZM (16) signal input port driven by MAC layer (3); The signal that modulates is linked into first group N circulator (7) and second group N circulator (17) by first group N Mach zehnder modulators MZM (5) with second group N Mach zehnder modulators MZM (16) respectively, transmits through injection first optical fiber link (10) and second optical fiber link (21) after the first erbium-doped fiber amplifier EDFA1 (9) and the amplification of second erbium-doped fiber amplifier EDFA2 (20) light signal after multiplexing through a N
1 circular array waveguide optical grating AWG1 (8) and the 2nd N
1 circular array waveguide optical grating AWG2 (19) at last; First optical fiber link (10) and second optical fiber link (21) respectively the 31
among the remote node of the connection RN (11)N circular array waveguide optical grating AWG3 (12) and the 41
N circular array waveguide optical grating AWG4 (22), the middle composite signal of first optical fiber link (10) and second optical fiber link (21) through the 31
N circular array waveguide optical grating AWG3 (12) and the 41
be sent to optical network unit group ONU Group (13) behind N circular array waveguide optical grating AWG4 (22) demultiplexing; The the 31
N circular array waveguide optical grating AWG3 (12) demultiplexed signal gets into optical network unit group ONU Group (13) back and through first power splitter (23) downstream signal is divided into two-way earlier: the one tunnel gives the second reflective semiconductor optical amplifier RSOA (31) up-link carrier as second optical network unit ONU (32), the upward signal that modulates through the second reflective semiconductor optical amplifier RSOA (31) through second circulator (29) and other upward signals that modulate the 41
N circular array waveguide optical grating AWG4 (22) is multiplexing; Other one the tunnel gives the first downstream signal receiver (25) through first circulator (24) carries out the signal demodulation; The the 41
N circular array waveguide optical grating AWG3 (22) demultiplexed signal gets into optical network unit group ONU Group (13) back and through second power splitter (28) downstream signal is divided into two-way earlier: the one tunnel gives the first reflective semiconductor optical amplifier RSOA (26) up-link carrier as first optical network unit ONU (27), the upward signal that modulates through the first reflective semiconductor optical amplifier RSOA (26) through first circulator (24) and other upward signals that modulate the 31
N circular array waveguide optical grating AWG3 (12) is multiplexing; Other one the tunnel gives the second downstream signal receiver (30) through second circulator (29) carries out the signal demodulation.
Claims (2)
1. centralization light source orthogonal frequency division multiplexing passive optical network system; Pass through first optical fiber link (10) and second optical fiber link (21) remote node of the connection RN (11) by central local side CO (1) through the first erbium-doped fiber amplifier EDFA1 (9) and the second erbium-doped fiber amplifier EDFA2 (20); And distant-end node RN (11) connects the optical network unit group ONU Group (13) that is made up of two optical network unit ONU, it is characterized in that:
1) described central local side CO (1) is that first ECLD (2) is connected the first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15) respectively with second ECLD (14); N wavelength output port of the first pectination spectrum generator OFCG1 (4) connects first group of Mach zehnder modulators MZM (5) respectively; First group N Mach zehnder modulators MZM (5) signal drive ports links to each other with MAC layer (3); First group N Mach zehnder modulators MZM (5) signal output port links to each other with first group N circulator (7) respectively; (7) ports of first group of N circulator link to each other with first group N upward signal receiver (6); First group N circulator (7) another one port links to each other with a N
1 circular array waveguide optical grating AWG1 (8), and a N
1 circular array waveguide optical grating AWG1 (8) links to each other with the first erbium-doped fiber amplifier EDFA1 (9); First group N upward signal receiver (6) signal output port links to each other with MAC layer (3);
N wavelength output port of the second pectination spectrum generator OFCG2 (15) connects second group N Mach zehnder modulators MZM (16) respectively; Second group N Mach zehnder modulators MZM (16) signal drive ports links to each other with MAC layer (3); Second group N Mach zehnder modulators MZM (16) signal output port links to each other with second group N circulator (17) respectively; (17) ports of second group of N circulator link to each other with second group N upward signal receiver (18); Second group N circulator (17) another one port links to each other with the 2nd N
1 circular array waveguide optical grating AWG2 (19), and the 2nd N
1 circular array waveguide optical grating AWG2 (19) links to each other with the second erbium-doped fiber amplifier EDFA2 (20); Second group N upward signal receiver (18) signal output port links to each other with MAC layer (3);
2) said distant-end node RN (11) comprise the 31
N circular array waveguide optical grating AWG3 (12) and the 41
(22) two circular array waveguide optical grating AWG of N circular array waveguide optical grating AWG4, these two circular array waveguide optical grating AWG connect N optical network unit group ONU Group (13) that are made up of two optical network units;
3) said optical network unit group ONU Group (13) is made up of (32) two optical network units of first optical network unit ONU (27) and second optical network unit ONU: first port of one first power splitter (23) be connected the 31
(12) ports of N circular array waveguide optical grating AWG3; Second port of this first power splitter (23) connects one first circulator (24), and this first power splitter (23) the 3rd port connects one the second reflective semiconductor optical amplifier RSOA (31) in second optical network unit ONU (32); First port of one second power splitter (28) connect the 41
(22) ports of N circular array waveguide optical grating AWG4; Second port of this second power splitter (28) connects one second circulator (29), and the 3rd port of this second power splitter (28) connects one the first reflective semiconductor optical amplifier RSOA (26) in first optical network unit ONU (27); One first downstream signal receiver (25) links to each other with one first circulator (24), and one second downstream signal receiver (30) links to each other with second circulator (29).
2. centralization light source orthogonal frequency division multiplexing passive optical network transmission method; Adopt centralization light source orthogonal frequency division multiplexing passive optical network according to claim 1 system to realize the light source center transmission; It is characterized in that: first ECLD (2) among the described central local side CO (1) and second ECLD (14) are distinguished emission wavelength simultaneously and are planted light for
and
; Be used to drive the first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15); The first pectination spectrum generator OFCG1 (4) and the second pectination spectrum generator OFCG2 (15) produce N carrier wave
~
and
~
respectively; These two groups of N carrier waves differ N FSR doubly; The benefit of doing like this is to utilize circulating duct grating AWG, and the port that
can pass through
also can pass through; The carrier wave of being sent into first group N Mach zehnder modulators MZM (5) by
~
carrier wave of the first pectination spectrum generator OFCG1 (4) generation respectively enters the mouth, and the signal input port of first group N Mach zehnder modulators MZM (5) is driven by MAC layer (3);
~
carrier wave by the second pectination spectrum generator OFCG2 (15) produces is sent into second group N Mach zehnder modulators MZM (16) respectively, and second group N Mach zehnder modulators MZM (16) signal input port driven by MAC layer (3); The signal that modulates is linked into first group N circulator (7) and second group N circulator (17) by first group N Mach zehnder modulators MZM (5) with second group N Mach zehnder modulators MZM (16) respectively, transmits through injection first optical fiber link (10) and second optical fiber link (21) after the first erbium-doped fiber amplifier EDFA1 (9) and the amplification of second erbium-doped fiber amplifier EDFA2 (20) light signal after multiplexing through a N
1 circular array waveguide optical grating AWG1 (8) and the 2nd N
1 circular array waveguide optical grating AWG2 (19) at last; First optical fiber link (10) and second optical fiber link (21) respectively the 31
among the remote node of the connection RN (11)N circular array waveguide optical grating AWG3 (12) and the 41
N circular array waveguide optical grating AWG4 (22), the middle composite signal of first optical fiber link (10) and second optical fiber link (21) through the 31
N circular array waveguide optical grating AWG3 (12) and the 41
be sent to optical network unit group ONU Group (13) behind N circular array waveguide optical grating AWG4 (22) demultiplexing; The the 31
N circular array waveguide optical grating AWG3 (12) demultiplexed signal gets into optical network unit group ONU Group (13) back of being made up of two optical network units and through first power splitter (23) downstream signal is divided into two-way earlier: the one tunnel gives the second reflective semiconductor optical amplifier RSOA (31) up-link carrier as second optical network unit ONU (32), the upward signal that the warp second reflective semiconductor optical amplifier RSOA (31) modulates through second circulator (29) and other upward signals that modulate the 41
N circular array waveguide optical grating AWG4 (22) is multiplexing; Other one the tunnel gives the first downstream signal receiver (25) through first circulator (24) carries out the signal demodulation; The the 41
N circular array waveguide optical grating AWG3 (22) demultiplexed signal gets into optical network unit group ONU Group (13) back and through second power splitter (28) downstream signal is divided into two-way earlier: the one tunnel gives the first reflective semiconductor optical amplifier RSOA (26) up-link carrier as first optical network unit ONU (27), the upward signal that modulates through the first reflective semiconductor optical amplifier RSOA (26) through first circulator (24) and other upward signals that modulate the 31
N circular array waveguide optical grating AWG3 (12) is multiplexing; Other one the tunnel gives the second downstream signal receiver (30) through second circulator (29) carries out the signal demodulation.
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CN104144362A (en) * | 2014-02-27 | 2014-11-12 | 上海大学 | System fusing optical orthogonal frequency division multiplexing passive optical access network and photoinduced millimeter wave technology and transmission method thereof |
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