CN100454801C - Optical coder and decoder with four phase modulation - Google Patents
Optical coder and decoder with four phase modulation Download PDFInfo
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- CN100454801C CN100454801C CNB2005100181474A CN200510018147A CN100454801C CN 100454801 C CN100454801 C CN 100454801C CN B2005100181474 A CNB2005100181474 A CN B2005100181474A CN 200510018147 A CN200510018147 A CN 200510018147A CN 100454801 C CN100454801 C CN 100454801C
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Abstract
The present invention relates to an optical encoder and an optical decoder with four-phase modulation. The optical encoder and the optical decoder with four-phase modulation have fiber gratings in a superstructure, and each grating is composed of four kinds of sub gratings with different phases, more specifically, the boundaries of the adjacent sub gratings, namely the boundaries of space code sheets, are provided with discrete phase shifts with the phase of 0, pi/2, pi and 3 pi/2, and meanwhile, four optical encoding and decoding of signals at 40 Gb/s speed and the transmission of four optical code division multiplexing signals are realized. The transmission comprises the following steps; after an ultrashort optical pulse emitted by an optical source (1) passes through an optical circulator (2), the optical encoder (3) is used for phase encoding to obtain a code sheet pulse sequence; the optical decoder (5) is used for decoding through the optical circulator (4) to obtain the autocorrelation function of a code sheet sequence; then, the autocorrelation function of the code sheet sequence is outputted by an optical path, and decoding work is finished. The present invention has the advantages that the structure is simple, compact and tight, the encoder and the decoder can be interchanged for use, which is favorable for full optical integration, full optical encoding/decoding at high speed can be realized, the price ratio is superior, and the present invention is easily popularized.
Description
Technical field
The present invention relates to the device of a kind of Optical Code Division Multiplexing technology in the optical fiber communication, particularly a kind of four phase modulated 40Gbit/s * 4OCDM optical encoder and decoder, it can realize full light high spped coding and decoding.
Background technology
Optical Code Division Multiplexing (OCDM) is subjected to attention more and more widely.Than traditional multiplex techniques such as wavelength division multiplexing, time division multiplexinges, the OCDM technology has more at random and inserts, asynchronous transmission and strong security, and networking flexibility, agreement is simple, but characteristics such as high-speed light processing.The key problem of OCDM technology is the realization of full light coding/decoding process, according to " J.lightwave technology " internal authority journal articles report, up to the present, the scheme of multiple realization light coding, decoding is arranged, as: 1. fiber delay time linear array; 2. planar light wave circuit; 3. array waveguide grating and based on the full optical encoder spare of Fiber Bragg Grating FBG (FBGS).Because the high-speed data coder/decoder to phase sensitive, in the such scheme, has only scheme 2 can realize up to 40Gbit/s single channel rate communication, two kinds of the highest speed that can only reach single channel 10Gb/s of scheme in addition, and coder/decoder is difficult to coupling, poor work stability.Then higher, the structure of cost is compact inadequately, volume is big etc. for scheme 2, causes popularization difficult.
Summary of the invention
Technical problem to be solved by this invention is: a kind of four phase modulated light encoder are provided, and it can not only the point-to-point code division multiplexing communication of high speed, and be beneficial to popularization.
The technical solution adopted in the present invention is, the four phase modulated light encoder that provide have the superstructure fiber grating, this grating is made up of the different sub-gratings of four kinds of phase places, specifically: to be that the boundary of space chip exists discrete 0 at adjacent sub-gratings, the phase shift of pi/2, π, 3 pi/2 phases, and realize 4 road light Code And Decode and the transmission of 4 road Optical Code Division Multiplexing signals of 40Gb/s rate signal simultaneously.Described superstructure fiber grating is the weak Bragg grating of refractive index＜20%, and the length overall of whole superstructure fiber grating is 2.59mm.
The step that four phase modulated light encoder are carried out the point-to-point transmission of single-channel code division multiplexing comprises:
A. the ultrashort light pulse that goes out of light emitted is by behind the optical circulator, utilizes that optical encoder carries out 0, pi/2, π, 3 pi/2 phases coding, obtains the chip pulse sequence.B. the chip pulse sequence utilizes the light decoder to decode by behind the optical circulator again, obtains the auto-correlation function of chip sequence.C. the auto-correlation function of chip sequence is exported by light path, and decoding work is so far finished, and realizes the transmission of 4 road Optical Code Division Multiplexing signals simultaneously, and its single channel speed is 40Gbit/s * 4OCDM.
Above-mentioned optical encoder and light decoder are a kind of superstructure fiber gratings, and its phase place is complex conjugate each other, and on time domain mirror-symmetrical, they constitute matched filtering.
The present invention is areas of information technology optical communication theme ultrahigh speed, ultra-wideband communication system device, compared with prior art has following major advantage: utilize full light coding/decoding to realize the point-to-point and network service of high speed, technological core is based on fiber grating design coder/decoder, characteristics are simple in structure, compact dense, coding, decoder are used interchangeably, and it is integrated to help full light; Employing four coding mutually has good auto-correlation and their cross correlation, with respect to bipolarity and unipolarity coding more performance is arranged; Can realize full light high spped coding/decoding, its single channel speed is up to the communication of 40Gbit/s * 4OCDM, and the channel frequency utilance reaches 1.6B/Hz.And cost performance is superior, and cost reduces significantly than other light coding/decoding technical products, thereby has more practicality, is easy to promote.
Description of drawings
Fig. 1 is based on the coupling optical encoder 3 of superstructure fiber grating and the structural representation block diagram of light decoder 5.
Fig. 2 be optical encoder 3 with light decoder 5 in code word and corresponding space superstructure schematic diagram.
Embodiment
The present invention's four phase modulated light encoder are a kind of devices that can realize full light high spped coding and decoding.
The invention will be further described below in conjunction with embodiment and accompanying drawing.
One. four phase modulated light encoder
As shown in Figure 1, has the superstructure fiber grating, this grating is made up of the different sub-gratings of four kinds of phase places, specifically: to be that the boundary of space chip exists discrete 0 at adjacent sub-gratings, the phase shift of pi/2, π, 3 pi/2 phases, and realize 4 road light Code And Decode and the transmission of 4 road Optical Code Division Multiplexing signals of 40Gb/s rate signal simultaneously.
Above-mentioned superstructure fiber grating is the weak Bragg grating of refractive index＜20%; The grating of optical encoder and decoder respectively comprises the sub-gratings of 7 space chips; Whole grating is that the length overall of superstructure fiber grating is 2.59mm, is that cycle of optical encoder and decoder space chip is 25ps corresponding to whole space chip.The space structure that Fig. 2 has provided this device with and corresponding code word, this figure only is an example.
The sub-gratings length L of each space chip
cBe the 0.37mm (see figure 2), its cycle corresponding to single chip is 3.6ps.
Two. the purposes of four phase modulated light encoder
Can finish the coding/decoding of quaternary phase shift (0, pi/2, π, 3 pi/2s), be fit to be applied to the point-to-point and network communicating system of high speed of full Optical Code Division Multiplexing, its transmission rate is 40Gbit/s * 4OCDM, and can transmit 4 road Optical Code Division Multiplexing signals simultaneously.As shown in Figure 1, can utilize optical encoder 3 and light decoder 5 to realize that all users take the similar frequency bands and the time of same channel jointly, the used signal of different user transmission information is distinguished by different coded sequences.For example, first via signal encoding is Q
1={ 1,1,1,2,0,3,0} then the second the tunnel is encoded to Q
2=1,1,0,0,1,2,3}, or the like.Wherein, 0,1,2,3, respectively with phase place 0, pi/2, π, 3 pi/2 correspondences.
Three. the method that four phase modulated light Code And Decode devices carry out the point-to-point transmission of single channel code division multiplexing
As shown in Figure 1, its step comprises:
A. the ultrashort light pulse launched of light source 1 is by behind the optical circulator 2, utilizes that optical encoder 3 carries out 0, pi/2, π, 3 pi/2 phases coding, obtains the chip pulse sequence.
B. the chip pulse sequence utilizes light decoder 5 to decode by behind the optical circulator 4 again, obtains the auto-correlation function of chip sequence.
C. the auto-correlation function of chip sequence is exported by light path, and decoding work is so far finished, and realizes the transmission of 4 road Optical Code Division Multiplexing signals simultaneously, and its channel speed is 40Gbit/s * 4OCDM.
Above-mentioned light source 1 can be a ultrashort pulse laser, and its pulse repetition frequency can be 40GHz, and pulse duration can be 1.5ps.Optical encoder 3 is a kind of superstructure fiber grating with 5 of light decoders, and its phase place is complex conjugate each other, and on time domain mirror-symmetrical, they constitute matched filtering.
Claims (7)
1. optical encoder and decoder, it is characterized in that four phase modulated light encoder, it has the superstructure fiber grating, this grating is made up of the different sub-gratings of four kinds of phase places, specifically: to be that the boundary of space chip exists discrete 0 at adjacent sub-gratings, the phase shift of pi/2, π, 3 pi/2 phases, and realize 4 road light Code And Decode and the transmission of 4 road Optical Code Division Multiplexing signals of 40Gb/s rate signal simultaneously; Described superstructure fiber grating is the weak Bragg grating of refractive index＜20%, and the length overall of whole superstructure fiber grating is 2.59mm.
2. optical encoder according to claim 1 and decoder is characterized in that the grating of described optical encoder and decoder respectively comprises the sub-gratings of 7 space chips; Corresponding to whole space chip, promptly the cycle of optical encoder and decoder space chip is 25ps.
3. optical encoder according to claim 2 and decoder, the sub-gratings length that it is characterized in that each space chip is 0.37mm, its cycle corresponding to single chip is 3.6ps.
4. the purposes of a phase modulated light encoder in the point-to-point transmission of carrying out single-channel code division multiplexing, it is characterized in that: finish 0, the coding/decoding of pi/2, π and 3 pi/2 quaternary phase shifts, be fit to be applied to the point-to-point and network communicating system of high speed of full Optical Code Division Multiplexing, its transmission rate is 40Gbit/s * 40CDM, and can transmit 4 road Optical Code Division Multiplexing signals simultaneously.
5. purposes according to claim 4, it is characterized in that utilizing optical encoder (3) and light decoder (5) to realize that all users take the similar frequency bands and the time of same channel jointly, the used signal of different user transmission information is distinguished by different coded sequences.
6. optical encoder and the decoder method of carrying out the point-to-point transmission of single channel code division multiplexing is characterized in that the method that a kind of four phase modulated light Code And Decode devices carry out the point-to-point transmission of single-channel code division multiplexing, and its step comprises:
A. the ultrashort light pulse launched of light source (1) is by behind the optical circulator (2), utilizes that optical encoder (3) carries out 0, pi/2, π, 3 pi/2 phases coding, obtains the chip pulse sequence,
B. the chip pulse sequence utilizes light decoder (5) to decode by behind the optical circulator (4) again, obtains the auto-correlation function of chip sequence,
C. the auto-correlation function of chip sequence is exported by light path, and decoding work is so far finished, and realizes the transmission of 4 road Optical Code Division Multiplexing signals simultaneously, and its single channel speed is 40Gbit/s * 40CDM,
Above-mentioned optical encoder (3) and light decoder (5) are a kind of superstructure fiber gratings, and its phase place is complex conjugate each other, and on time domain mirror-symmetrical, they constitute matched filtering.
7. the method for transmission according to claim 6 is characterized in that light source (1) is a ultrashort pulse laser, and pulse repetition frequency is 40GHz, and pulse duration is 1.5ps.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882631A (en) * | 2012-10-16 | 2013-01-16 | 广西师范大学 | Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4655845B2 (en) * | 2005-09-15 | 2011-03-23 | 沖電気工業株式会社 | Optical pulse time spreader |
| CN101359961B (en) * | 2007-07-31 | 2011-07-27 | 北京大学 | Optical code converter based on Bragg grating of super-structure optical fiber |
| CN102142919B (en) * | 2010-01-29 | 2014-06-04 | 冲电气工业株式会社 | Optical code division multiplexing signal generating device |
| CN108534988B (en) * | 2018-04-18 | 2020-12-29 | 中山水木光华电子信息科技有限公司 | System for realizing optical fiber coding by using circulator |
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| CN1347210A (en) * | 2001-11-15 | 2002-05-01 | 上海交通大学 | Code overlapped fast hopping optical CDMA access system |
| US20020163696A1 (en) * | 2000-06-23 | 2002-11-07 | Jen-Fa Huang | Fiber bragg grating-based optical CDMA encoder/decoder |
| CN1399420A (en) * | 2002-08-29 | 2003-02-26 | 上海交通大学 | Incoherent chirp-encoding optical CDMA access system |
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| US20020163696A1 (en) * | 2000-06-23 | 2002-11-07 | Jen-Fa Huang | Fiber bragg grating-based optical CDMA encoder/decoder |
| CN1347210A (en) * | 2001-11-15 | 2002-05-01 | 上海交通大学 | Code overlapped fast hopping optical CDMA access system |
| CN1399420A (en) * | 2002-08-29 | 2003-02-26 | 上海交通大学 | Incoherent chirp-encoding optical CDMA access system |
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| 49-53. 张志朋，马秀莉，杨淑雯OCDMA系统中光纤光栅编/解码器设计与实现.深圳大学学报理工版211. 2004 |
| 49-53. 张志朋，马秀莉，杨淑雯OCDMA系统中光纤光栅编/解码器设计与实现.深圳大学学报理工版211. 2004 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882631A (en) * | 2012-10-16 | 2013-01-16 | 广西师范大学 | Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding |
| CN102882631B (en) * | 2012-10-16 | 2015-01-07 | 广西师范大学 | Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding |
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Assignee: Ningbo Yongjia Technology Co., Ltd. Assignor: Huazhong University of Science and Technology Contract record no.: 2011330000431 Denomination of invention: Optical coder and decoder with four phase modulation Granted publication date: 20090121 License type: Exclusive License Open date: 20050727 Record date: 20110506 |
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