CN101938313B - Optical signal processing method, device and system in passive optical network - Google Patents
Optical signal processing method, device and system in passive optical network Download PDFInfo
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- CN101938313B CN101938313B CN201010240433.6A CN201010240433A CN101938313B CN 101938313 B CN101938313 B CN 101938313B CN 201010240433 A CN201010240433 A CN 201010240433A CN 101938313 B CN101938313 B CN 101938313B
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Abstract
The embodiment of the invention discloses a signal processing device in a passive optical network, which comprises a first optical splitter 204, a mode coupling unit 203, an optical signal enhancing module 206 and a second optical splitter 202, wherein the first optical splitter 204 is used for combining multiple paths of uplink optical signals; the mode coupling unit 203 is used for performing low loss convergence on multiple paths of single-mode optical signals or single path of multi-mode optical signals by matching the modes of the uplink optical signals combined by the first optical splitter 204 according to the principle of optical field matching and convergence of multiple single-mode optical fibers; the optical signal enhancing module 206 is used for amplifying the optical signals converged by the mode coupling unit 203; and the second optical splitter 202 is used for combining the optical signals amplified by the optical signal enhancing module 206. The embodiment of the invention also discloses a passive optical network and a signal processing method. Therefore, the uplink optical power consumption can be greatly reduced, and a high optical power budget is obtained in a low-cost mode.
Description
Technical field
The present invention relates to optical communication field, specifically, relate to a kind of optical signal of passive optical network processing method, device and system.
Background technology
In optical access network, PON (passive optical network, EPON) technology is a kind of common technology that realizes, PON technology is the light access technology that a kind of point-to-multipoint transmits, the formation of PON system can be with reference to shown in figure 1: in PON system, comprise OLT (Optical Line Terminal, optical line terminal), ODN (Optical Distribute Network, light distributed network), ONU (Optical Network Unit, optical network unit) form, wherein OLT, for OAN provides network side interface SNI, connects one or more ODN; ODN is transferred to each ONU by the descending data of OLT along separate routes by light, although ODN is a kind of passive optical splitters part, but can between ODN and OLT, add active EB (Extension Box, expansion box) increase connection distance, equally, ODN arrives OLT by the upstream data of ONU by aggregate transmission; ONU, for OAN provides user side interface (UNI), is connected with ODN simultaneously.
Traditional PON system, comprises GPON and EPON, usually, generally only provide the 28dB optical power budget of (being Class B+), and coverage distance is less than 20km, branching ratio 1: 16 to 1: 64 to the ODN between EB and ONU; But if obtain the optical power budget of 32dB, need select more expensive Class C+ optical module, cost is too large.In mode cheaply, obtain large optical power budget, become important and challenging problem in long distance P ON.
Summary of the invention
The embodiment of the present invention has proposed a kind of optical signal of passive optical network processing method, device and system, in mode cheaply, obtains larger optical power budget.
The embodiment of the present invention provides the signal processing apparatus in a kind of EPON, comprising:
Optical splitter 1 is processed for multichannel uplink optical signal being closed to ripple;
Light signal strengthens module 206 and amplifies for the light signal after described Mode Coupling unit 203 is converged;
Optical splitter 2 202 closes ripple processing for light signal light signal being strengthened after module 206 is amplified.
The embodiment of the present invention provides a kind of passive optical network, described system comprises optical line terminal, light distributed network and a plurality of optical network unit, described system also comprises the signal processing apparatus described in the claims, described optical line terminal is connected with described optical distribution network by described signal processing apparatus, and described optical distribution network is connected with described a plurality of optical network units.
The embodiment of the present invention provides the signal processing method in a kind of EPON, comprising:
Multichannel uplink optical signal is closed to ripple to be processed;
According to the light field coupling of many monomode fibers, converge principle, after described pattern of closing the uplink optical signal after ripple is processed is mated, converge;
By further closing ripple after the optical signal amplification after described converging, process.
The embodiment of the present invention is by introducing Mode Coupling unit and optical splitter associated treatment, and the light field coupling that adopts many monomode fibers converges principle its insertion loss optimization in light path is reduced, thereby can greatly reduce up optical power loss, and then lifting optical power budget and branching ratio, without change original OLT, ONU and ODN, can obtain large optical power budget in mode cheaply.
accompanying drawing explanation
Fig. 1 is passive optical network PON system architecture diagram;
Fig. 2 is the structure chart of the Mode Coupling EB of the embodiment of the present invention;
Fig. 3 is the Mode Coupling cellular construction figure of the embodiment of the present invention;
Fig. 4 is the PON system architecture figure mono-that comprises Mode Coupling EB of the embodiment of the present invention;
Fig. 5 is the PON system architecture figure bis-that comprises Mode Coupling EB of the embodiment of the present invention.
Embodiment
The embodiment of the present invention has proposed a kind of Mode Coupling EB, adopts this EB can form the novel large branching ratio PON of electric relaying, can greatly reduce optical power loss, and then promotes optical power budget.
The embodiment of the present invention one provides a kind of Mode Coupling EB 201, and described Mode Coupling EB201 comprises optical splitter 2 202 as shown in Figure 2, and Mode Coupling unit 203, optical splitter 1, light signal strengthen module 206;
On up direction (direction from left to right)
Described optical splitter 1 is processed for multichannel uplink optical signal being closed to ripple;
Described Mode Coupling unit 203, mates for the pattern of the uplink optical signal by after described optical splitter 1 being closed to ripple and processing, and the single-mode optics signal of multichannel or single channel multimode light signal is carried out to low-loss and converge;
Described light signal strengthens module 206 and amplifies for the light signal to after described Mode Coupling unit 203 convergence processing; Can be specifically to carry out amplifying signal by photoelectricity and electric light conversion, or directly light signal be strengthened to processing.
Described optical splitter 2 202 is for again closing ripple processing to the light signal strengthening through light signal after module 206 is amplified.
Further, on down direction, (direction of turning left from the right side) also comprises optical branching device 205, and described optical branching device 205 strengthens module 206 with described optical splitter 1 and described light signal respectively and is connected, wherein
Described optical splitter 2 202 is also for multiplexing by the downlink optical signal receiving being carried out to partial wave;
Described optical branching device 205 is for being divided into multichannel by light signal;
Described optical splitter 1 is also for merging into multichannel downlink optical signal one road downlink optical signal;
Wherein said Mode Coupling unit 203, as shown in Figure 3, specifically comprises
Described Mode Coupling unit 203 also comprises shunt module 2034 further, for downlink optical signal is carried out to shunt.
Because optical splitter is a kind of optical power distribution devices, in traditional PON system that contains optical splitter, for up (from ONU to OLT), be consistent with the decay of descending (from OLT to ONU) signal, cause the optical power loss of PON uplink burst direction very large.The PON system of utilizing Mode Coupling EB proposing in the present embodiment, by introducing Mode Coupling unit and optical splitter associated treatment, closes ripple by optical branching device by up-downgoing light signal and transmits; And by Mode Coupling unit, the light field coupling that adopts many monomode fibers is converged to principle its insertion loss optimization in light path is reduced, specifically the transverse mode mould field distribution of multichannel single-mode optics is changed, make it better to mate with photo-detector or multimode waveguide, thereby can greatly reduce up optical power loss, and then promote optical power budget and branching ratio, without change original OLT, ONU and ODN.It is prior art that wherein said light field coupling converges principle, and no further details to be given herein for the present embodiment.
And this invention technology can be applied to 10G PON equally, thereby solve the more nervous optical power budget demand of 10G PON system.The present invention greatly promotes the optical power budget of ODN by Mode Coupling EB, the Mode Coupling unit of the 4:1 proposing as the present invention can make ascending power budget promote 5dB left and right, utilizes this extra 5dB optical power budget can the extended fiber about 15KM of distance or promote branching ratio more than one times; The Mode Coupling unit of 8:1 can make branching ratio promote twice, reaches 256 branching ratios under above-mentioned condition.
Further, described Mode Coupling unit 203 also comprises shunt module, and described shunt module is for carrying out shunt to downlink optical signal.
Described shunt module is equivalent to the optical branching device in optical distribution network ODN (as shown in Figure 5) in passive optical network PON system, if PON adopts the EB that contains described shunt module, shown in the Fig. 6 of institute, just can cancel the optical branching device in ODN, like this, the light loss that former cause optical branching device brings has just been substituted by the insertion loss of pattern coupling unit 203, has further reduced the optical power loss in PON system.
The embodiment of the present invention three provides optical signal processing method in a kind of PON system, and described PON system is the PON system shown in Fig. 4 or Fig. 5, and wherein said Mode Coupling unit 203 can not comprise shunt module.Described method comprises:
Step 602: multichannel uplink optical signal is closed to ripple and process;
Step 604: converge principle according to the light field coupling of many monomode fibers, converge after described pattern of closing the uplink optical signal after ripple is processed is mated;
Step 606: process further closing ripple after the optical signal amplification after described converging.
Further, describedly also comprise
Step 702: the downlink optical signal receiving is carried out to partial wave multiplexing;
Step 704: be divided into multichannel by carrying out the light signal of described partial wave after multiplexing;
Step 706: described multichannel downlink optical signal is merged into a road downlink optical signal;
Above-described embodiment also can utilize in longer distance, larger branching ratio PON system, and the EB based on MC can be used jointly in conjunction with image intensifer, improves descending and up optical power budget, meets the light power requirements of whole PON system; And because above-described embodiment and signal rate are irrelevant, can be conveniently used in as PON systems of future generation such as 10G PON.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential hardware platform by software and realize, and can certainly all by hardware, implement.Understanding based on such, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the present invention or embodiment.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. the signal processing apparatus in EPON, is characterized in that, comprising:
Optical splitter one (204) is processed for multichannel uplink optical signal being closed to ripple;
Mode Coupling unit (203), for mating by described optical splitter one (204) being closed to the pattern of the uplink optical signal after ripple is processed, converges the single-mode optics signal of multichannel or single channel multimode light signal according to the result of coupling;
Light signal strengthens module (206) and amplifies for the light signal after described Mode Coupling unit (203) is converged;
Optical splitter two (202) closes ripple processing for light signal light signal being strengthened after module (206) is amplified.
2. device according to claim 1, is characterized in that, described light signal strengthens module and carrys out amplifying signal by photoelectricity and electric light conversion, or directly light signal is strengthened to processing.
3. device according to claim 1, is characterized in that, described device also comprises optical branching device (205); Described optical branching device (205) strengthens module (206) with optical splitter one (204) and light signal respectively and is connected, for the light signal that strengthens module (206) from light signal is divided into multipath light signal, and described multipath light signal is transported to optical splitter one (204).
4. according to the device described in claim 1,2 or 3, it is characterized in that, described Mode Coupling unit comprises:
Transceiver module, for being converted to the signal of telecommunication after receiving optical signals, and launches after converting electrical signals to light signal;
Pattern matching module, mates for the pattern of the single-mode optics signal to multichannel or single channel multimode light signal;
Convergence module, the result for the pattern of the light signal receiving being mated according to described pattern matching module, converges at transceiver module by described light signal.
5. device according to claim 4, it is characterized in that, described pattern matching module comprises Mode Coupling method, free space lens coupling method or the optical fiber fused tapering method of utilizing based on planar optical waveguide platform to the mode of mating of light signal.
6. a passive optical network, described system comprises optical line terminal, light distributed network and a plurality of optical network unit, it is characterized in that, described system also comprises the signal processing apparatus described in Arbitrary Term in the claims 1-5, described optical line terminal is connected with described optical distribution network by described signal processing apparatus, and described optical distribution network is connected with described a plurality of optical network units.
7. the signal processing method in EPON, is characterized in that, comprising:
Multichannel uplink optical signal is closed to ripple to be processed;
After described pattern of closing the uplink optical signal after ripple is processed is mated, according to the result of coupling, the uplink optical signal through closing after ripple is processed is converged;
By further closing ripple after the optical signal amplification after described converging, process.
8. method according to claim 7, is characterized in that, also comprises:
The downlink optical signal receiving is carried out to partial wave multiplexing;
By carrying out the light signal of described partial wave after multiplexing, be divided into multichannel;
Described multichannel downlink optical signal is merged into a road downlink optical signal.
9. method according to claim 7, it is characterized in that, the described mode that the pattern of described uplink optical signal is mated comprises Mode Coupling method, free space lens coupling method or the optical fiber fused tapering method of utilizing based on planar optical waveguide platform.
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| WO2011137761A2 (en) * | 2011-05-09 | 2011-11-10 | 华为技术有限公司 | Passive optical splitter and passive optical network system |
| CN106170723B (en) * | 2014-12-26 | 2019-06-11 | 华为技术有限公司 | A kind of optical splitter and passive optical network |
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| US6239889B1 (en) * | 1997-10-22 | 2001-05-29 | Nortel Networks Limited | Optical signal power detection with signature bit pattern in WDM systems |
| CN1426180A (en) * | 2002-12-12 | 2003-06-25 | 武汉光迅科技有限责任公司 | Light wave length/mode converter |
| CN101014891A (en) * | 2004-09-08 | 2007-08-08 | 阿尔卡特朗讯公司 | A mode converter |
| CN101320111A (en) * | 2007-06-04 | 2008-12-10 | 李冰 | Parallel mode converter and optical divider composed by the same |
| CN101324446A (en) * | 2008-07-24 | 2008-12-17 | 北京航空航天大学 | Destabilization sensing localization method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6239889B1 (en) * | 1997-10-22 | 2001-05-29 | Nortel Networks Limited | Optical signal power detection with signature bit pattern in WDM systems |
| CN1426180A (en) * | 2002-12-12 | 2003-06-25 | 武汉光迅科技有限责任公司 | Light wave length/mode converter |
| CN101014891A (en) * | 2004-09-08 | 2007-08-08 | 阿尔卡特朗讯公司 | A mode converter |
| CN101320111A (en) * | 2007-06-04 | 2008-12-10 | 李冰 | Parallel mode converter and optical divider composed by the same |
| CN101324446A (en) * | 2008-07-24 | 2008-12-17 | 北京航空航天大学 | Destabilization sensing localization method |
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