CN202931335U - Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding - Google Patents
Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding Download PDFInfo
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- CN202931335U CN202931335U CN 201220528942 CN201220528942U CN202931335U CN 202931335 U CN202931335 U CN 202931335U CN 201220528942 CN201220528942 CN 201220528942 CN 201220528942 U CN201220528942 U CN 201220528942U CN 202931335 U CN202931335 U CN 202931335U
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Abstract
The invention discloses an optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding. Different spread spectrum codons are used for digital signals of different users, spread spectrum encoding is carried out by an electric domain encoder, electric encoding signals of all the users are multiplexed, and all the encoding signals are modulated on one group of optical signals with different wave lengths for transmission. Wavelength demultiplexing and photoelectric conversion are first carried out on received optical signals by a wave demultiplexer/multiplexer at a receiving end, and data signals of target users can be recovered as long as corresponding decoder structures are used for the electric signals with different wavelengths. Compared with a traditional incoherent optical code demultiplexing/multiplexing system, the method has the advantages that influence brought by beating noise and multiple access interference can be better eliminated, and better system transmission performance is obtained.
Description
Technical field
The utility model belongs to technical field of optical fiber communication, a kind of Optical Code Division Multiplexing sending and receiving device based on the encoding and decoding of electric territory that is specifically related to use in optical access network.
Background technology
Optical code division multiple access technique (OCDMA) is a kind of communication mode that code division multiple access (CDMA) technology is combined with jumbo Fibre Optical Communication Technology.The OCDMA technology is compared with other multiplex techniques, has to support complete asynchronous transmission, the characteristics such as ability of transparent to different host-host protocols in channel shared by multiple users.Although the researcher has proposed many optical encoder designs, so far, still do not have suitable method can prepare simply, low cost is convenient to extensive commercial optical encoder.In addition, for beat interference noise and the multiple access that can eliminate light signal in the OCDMA system disturbs to obtain good transmission performance, need to use complicated and expensive photo threshold device and light time territory threshold technique at receiving terminal.In recent years, due to improving constantly and cost cheap of electric device processing speed, the researcher proposes the Optical Code Division Multiplexing system that process in electric territory.
2010 Japanese OKI Electrics Industry Co., Ltd. (OKI) a kind of Optical Code Division Multiplexing system that processes based on electric territory has been proposed.In electric territory, user's the transmission of data is carried out ambipolar time domain code word Direct-Spread, and a plurality of users' the transmission of data mode by code division multiplexing is coupled, be modulated on light signal at last and transmit by optical fiber.Receiving terminal carries out opto-electronic conversion, carries out coherent signal in electric territory and processes and corresponding spreading spectrum and decoding, recovers targeted customer's data-signal.This scheme adopts large scale integrated circuit to carry out electric territory spread spectrum coding, and uses CCD decoder and matched filter to decode at receiving terminal, has replaced analog-to-digital conversion and digital matching and decoding.But merit attention, due to traditional electric territory CDMA(ECDMA) in spread spectrum and despreading all need to carry out under section is synchronous, so for the ECDMA system, no matter at up or down link, all will cut into slices when carrying out the decoding of electric territory synchronous.For down link, can realize that easily section is synchronous at OLT, and for up link, need to carry out certain FEEDBACK CONTROL between OLT and each ONU.
In traditional ECDMA technology, data rate satisfies following formula: data rate * code word size (user data rate)=section digit rate.In formula, code word size represents the code word number of energy use, is also representing the user capacity in system simultaneously.Because the ECDMA scheme is the signal of telecommunication to be carried out the direct expansion of time domain, electric territory codec has to operate on section speed, and the processing speed in electric territory is limiting section speed.If increase code length in order to improve number of users, transmission rate that can restricting data.Therefore for the ECDMA scheme, the section speed that improves electric codec is its emphasis, and the processing speed bottleneck in electric territory is difficult to overcome at short notice.
In order to overcome the shortcoming of ECDMA scheme, the researcher proposes a kind of Optical Code Division Multiplexing system of the multistage amplitude shift key modulation mode of spectral domain based on electric domain space coding.At transmitting terminal, utilization has the electric territory encoder of array of photoswitch, a plurality of users' data-signal is carried out space encoding based on electric territory, form corresponding incoherent Spectral-amplitude-coded (SAC) signal, the k road SAC code signal that produces is carried in respectively on k different subcarrier signal by optical modulator, carries out signal after subcarrier multiplexing and is modulated at that light signal is enterprising to be entered in optical fiber to transmit again.Light source is comprised of the laser array of respective wavelength, and after receiving terminal uses wavelength division multiplexer with transmitting optical signal demultiplexing and opto-electronic conversion, receives by corresponding decoder architecture.Because this scheme is carried out space encoding with subscriber signal in electric territory, the different slice signals after coding are modulated on the light signal of different frequency and transmit, and have namely carried out frequency domain expansion.Therefore in this scheme, data rate equates with section speed, can overcome the bottleneck of electric treatment speed, improves the transmission rate of system.But this scheme needs array of photoswitch in the process of electric territory coding, and a plurality of radio-frequency signal sources formation of subcarrier multiplexing scheme needs subcarrier multiplexing signals, uses laser array as light source, has improved complexity and the cost of system.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of Optical Code Division Multiplexing sending and receiving device based on the encoding and decoding of electric territory, and it has the advantages that cost is low, volume is little and integrated level is high.
For addressing the above problem, the utility model is realized by following scheme:
A kind of Optical Code Division Multiplexing dispensing device based on the encoding and decoding of electric territory, main by the programmable logic device encoder with n input and L output, light source, L optical modulator, L optical circulator, L fiber grating, and optical coupler forms; Wherein respectively connect one road subscriber signal on the n of a programmable logic device encoder input; The output of light source is connected with the input of the first optical circulator, and the transmission output of the first optical circulator is connected with the input of the first fiber grating, and the output of the first fiber grating is connected with the input of the second optical circulator; The transmission output of the second optical circulator is connected with the input of the second fiber grating, and the output of the second fiber grating is connected with the input of the 3rd optical circulator; The like, the transmission output of L optical circulator is connected with the input of L fiber grating; Each is connected the emission output of L optical circulator with one of them input of an optical modulator, another input of this L optical modulator is connected on L different output of programmable logic device encoder, and the output of L optical modulator is connected to the input of optical coupler jointly.
In above-mentioned dispensing device, described programmable logic device encoder mainly contains n multiplier, n deserializer, and L adder forms; Wherein 2 of each multiplier inputs connect respectively one road subscriber signal and one road spread spectrum code word; The output of each multiplier is individual to be connected with the input of a deserializer; Each deserializer all has L output; The first via output of each deserializer all is connected on the input of first adder, the the second road output of each deserializer all is connected on the input of second adder, the like, the L road output of each deserializer all is connected on the input of L adder.
In above-mentioned dispensing device, described light source is the amplified spontaneous emission wideband light source.
In above-mentioned dispensing device, the span of described L is between 7～993.
In above-mentioned dispensing device, the span of described n is between 1～L.
A kind of Optical Code Division Multiplexing receiving system based on the encoding and decoding of electric territory, mainly by wavelength division multiplexer, L photoelectric detector, L decoding multiplier, spreading code word arithmetic device, decoding adder and weight multiplier form; Wherein wavelength division multiplexer has L output, each is connected each output of wavelength division multiplexer with the wherein input of a decoding multiplier through a photoelectric detector, another input of this L decoding multiplier all is connected with the output of spreading code word arithmetic device, the output of L decoding multiplier is connected to the input of decoding adder jointly, and the output of decoding adder is connected with the input of weight multiplier.
In above-mentioned receiving system, the span of described L gets involved between 7～993.
In above-mentioned receiving system, the span of described n is between 1～L.
Principle of the present utility model is: each user data signal uses different spread spectrum code words, carry out spread spectrum coding by electric territory encoder, each user's coded electrical signal is together multiplexing, and all code signals are modulated at one group to have on the different wave length signal and transmit.Use wavelength division multiplexer that the light signal that receives is first carried out wavelength (de) multiplexing and opto-electronic conversion at receiving terminal, can recover targeted customer's data-signal to the corresponding decoder architecture of signal of telecommunication use of each road wavelength.The method is compared to traditional incoherent light code-division multiplexing system, can better eliminate beat noise and multiple access and disturb the impact that brings, and obtains better system transmissions performance.
Compared with prior art, the utlity model has following advantage:
1, the utility model adopts is unipolarity address code in OCDMA, rather than the bipolarity address code in conventional wireless CDMA, so native system belongs to the Optical Code Division Multiplexing system, and has the characteristics of asynchronous random access and channel shared by multiple users.
2, the utility model utilizes the space encoding in electric territory, traditional light territory SAC after realizing, electric territory is modulated on different optical wavelength again, can avoid the optical device that uses volume large and expensive, and can eliminate the beat noise between light signal, and give full play to the advantage of balance detection method of reseptance in SAC, the multiple access in the elimination system disturbs.
3, use programmable logic device as electric territory encoder in the utility model, do not need bulky array of photoswitch and expensive radio-frequency devices, can realize the multistage amplitude keying coding in electric territory.And it is little that fpga chip has a volume, low-power consumption, integration high.
4, the utility model uses incoherent wideband light source as system source, greatly reduces the cost of system's transmitting terminal.Adopt the combination of ASE wideband light source and fiber grating, one group of different wave length signal is provided, replaced laser array, reduced the cost of system.In addition, due to the tunability of FBG wavelength, can be according to the variation of address code code word, thus dynamically in adjustment System the wavelength of light source form the dynamic change of adaptive system address code.
Description of drawings
Fig. 1 is system's optical transmitter structural representation.
Fig. 2 is FPGA coder structure schematic diagram.
Fig. 3 is system's optical receiver structural representation.
Embodiment
A kind of Optical Code Division Multiplexing transmission system based on the encoding and decoding of electric territory mainly is comprised of Optical Code Division Multiplexing dispensing device and at least one the Optical Code Division Multiplexing receiving system based on the encoding and decoding of electric territory based on the encoding and decoding of electric territory.
Above-mentioned Optical Code Division Multiplexing dispensing device based on the encoding and decoding of electric territory, as shown in Figure 1, main by the programmable logic device encoder with n input and L output, light source, L optical modulator, L optical circulator, L fiber grating, and optical coupler forms.Respectively connect one road subscriber signal on the n of a programmable logic device encoder input.In the utility model, described programmable logic device encoder mainly contains n multiplier as shown in Figure 2, n deserializer, and L adder forms.2 inputs of each multiplier connect respectively one road subscriber signal and one road spread spectrum code word.The output of each multiplier is individual to be connected with the input of a deserializer.Each deserializer all has L output.The first via output of each deserializer all is connected on the input of first adder, the the second road output of each deserializer all is connected on the input of second adder, the like, the L road output of each deserializer all is connected on the input of L adder.Be the amplified spontaneous emission wideband light source at light source described in the utility model.The output of light source is connected with the input of the first optical circulator, and the transmission output of the first optical circulator is connected with the input of the first fiber grating, and the output of the first fiber grating is connected with the input of the second optical circulator.The transmission output of the second optical circulator is connected with the input of the second fiber grating, and the output of the second fiber grating is connected with the input of the 3rd optical circulator.The like, the transmission output of L optical circulator is connected with the input of L fiber grating.Each is connected the emission output of L optical circulator with one of them input of an optical modulator, another input of this L optical modulator is connected on L different output of programmable logic device encoder, and the output of L optical modulator is connected to the input of optical coupler jointly.In the utility model, described spread spectrum code word is the unipolarity address code, and this spread spectrum code word need satisfy following 3 conditions, i.e. code length L=q simultaneously
2+ q+1, the heavy w=q+1 of code, coefficient correlation λ is 1.Above-mentioned q is prime number.According to the difference of customer service demand, the value of selected L is different, and L can get infinity in theory, but considers practical application, can not be infinitely great.Therefore in the utility model preferred embodiment, the value of q is between 2～31, and namely the span of L is between 7～993.And the span of described n is between 1～L.
Above-mentioned each all corresponding targeted customer of Optical Code Division Multiplexing receiving system based on the encoding and decoding of electric territory, namely each receiving system is that a targeted customer decodes.The number of the receiving system of system determines according to targeted customer's number, therefore based on the number of the Optical Code Division Multiplexing receiving system of electric territory encoding and decoding between 1～n.Above-mentioned each Optical Code Division Multiplexing receiving system based on the encoding and decoding of electric territory, as shown in Figure 3, mainly by wavelength division multiplexer, L photoelectric detector, L decoding multiplier, spreading code word arithmetic device, decoding adder and weight multiplier form.Wavelength division multiplexer has L output, each is connected each output of wavelength division multiplexer with the wherein input of a decoding multiplier through a photoelectric detector, another input of this L decoding multiplier all is connected with the output of spreading code word arithmetic device, the output of L decoding multiplier is connected to the input of decoding adder jointly, and the output of decoding adder is connected with the input of weight multiplier.In above-mentioned receiving system, the span of described L is between 7～993.
Claims (8)
1. based on the Optical Code Division Multiplexing dispensing device of electric territory encoding and decoding, it is characterized in that: main by the programmable logic device encoder with n input and L output, light source, L optical modulator, L optical circulator, L fiber grating, and optical coupler forms; Wherein
Respectively connect one road subscriber signal on the n of a programmable logic device encoder input;
The output of light source is connected with the input of the first optical circulator, and the transmission output of the first optical circulator is connected with the input of the first fiber grating, and the output of the first fiber grating is connected with the input of the second optical circulator; The transmission output of the second optical circulator is connected with the input of the second fiber grating, and the output of the second fiber grating is connected with the input of the 3rd optical circulator; The like, the transmission output of L optical circulator is connected with the input of L fiber grating;
Each is connected the emission output of L optical circulator with one of them input of an optical modulator, another input of this L optical modulator is connected on L different output of programmable logic device encoder, and the output of L optical modulator is connected to the input of optical coupler jointly.
2. according to claim 1 based on the Optical Code Division Multiplexing dispensing device of electric territory encoding and decoding, it is characterized in that: described programmable logic device encoder mainly contains n multiplier, n deserializer, and L adder forms; Wherein
2 inputs of each multiplier connect respectively one road subscriber signal and one road spread spectrum code word; The output of each multiplier is individual to be connected with the input of a deserializer;
Each deserializer all has L output; The first via output of each deserializer all is connected on the input of first adder, the the second road output of each deserializer all is connected on the input of second adder, the like, the L road output of each deserializer all is connected on the input of L adder.
3. according to claim 1 based on the Optical Code Division Multiplexing dispensing device of electric territory encoding and decoding, it is characterized in that: described light source is the amplified spontaneous emission wideband light source.
4. according to claim 1 based on the Optical Code Division Multiplexing dispensing device of electric territory encoding and decoding, it is characterized in that: the span of described L is between 7～993.
5. according to claim 5 based on the Optical Code Division Multiplexing dispensing device of electric territory encoding and decoding, it is characterized in that: the span of described n is between 1～L.
6. based on the Optical Code Division Multiplexing receiving system of electric territory encoding and decoding, it is characterized in that: mainly by wavelength division multiplexer, L photoelectric detector, L decoding multiplier, spreading code word arithmetic device, decoding adder and weight multiplier form; Wherein
Wavelength division multiplexer has L output, each is connected each output of wavelength division multiplexer with the wherein input of a decoding multiplier through a photoelectric detector, another input of this L decoding multiplier all is connected with the output of spreading code word arithmetic device, the output of L decoding multiplier is connected to the input of decoding adder jointly, and the output of decoding adder is connected with the input of weight multiplier.
7. according to claim 6 based on the Optical Code Division Multiplexing receiving system of electric territory encoding and decoding, it is characterized in that: the span of described L is between 7～993.
8. according to claim 6 based on the Optical Code Division Multiplexing receiving system of electric territory encoding and decoding, it is characterized in that: the span of described n is between 1～L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301039A (en) * | 2014-09-11 | 2015-01-21 | 广西师范大学 | Local side light transmitting and receiving device based on light code division multiple access |
| CN105553557A (en) * | 2015-12-16 | 2016-05-04 | 华进半导体封装先导技术研发中心有限公司 | Optical receiving unit structure for optical fiber communication |
| CN105634643A (en) * | 2016-01-27 | 2016-06-01 | 中国人民解放军国防科学技术大学 | Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301039A (en) * | 2014-09-11 | 2015-01-21 | 广西师范大学 | Local side light transmitting and receiving device based on light code division multiple access |
| CN105553557A (en) * | 2015-12-16 | 2016-05-04 | 华进半导体封装先导技术研发中心有限公司 | Optical receiving unit structure for optical fiber communication |
| CN105634643A (en) * | 2016-01-27 | 2016-06-01 | 中国人民解放军国防科学技术大学 | Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging |
| CN105634643B (en) * | 2016-01-27 | 2018-02-02 | 中国人民解放军国防科学技术大学 | A kind of optical fiber time Frequency Transfer method, apparatus and system based on two-way spread spectrum ranging |
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