CN101494501A - Multi-code type light transmitter and method for generating optical signal - Google Patents
Multi-code type light transmitter and method for generating optical signal Download PDFInfo
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Abstract
The invention discloses a multi-code type optical transmitter and an optical signal generation method, belonging to the field of optical communication. The transmitter comprises a precoding processing module and a modulator. The method comprises the following steps of: carrying out differential coding to data to be transmitted and generating two paths of coding data; carrying out modulation to the two paths of coding data; modulating the two paths of coding data to the optical signal; and generating a CSRZ optical signal or an APRZ optical signal. The invention carries out precoding to the data to be transmitted, and then carries out modulation to the coded data, thus being capable of generating the CSRZ optical signal and also being capable of generating the APRZ optical signal; simultaneously, the generated APRZ optical signal has high quality; and the method has simple realization, reduces the complexity of realization and effectively reduces the realization cost simultaneously.
Description
Technical field
The present invention relates to optical communication field, the method for particularly a kind of multi-code type light transmitter and light signal generating.
Background technology
Increase along with message capacity, especially the development of the universal and multimedia service of Fast Ethernet, speed fiber optic communication systems is just becoming research and commercial focus, the system of 40Gb/s has begun commercialization, the communication system of higher rate has also begun to enter normalization period as the Ethernet of 100Gb/s.Raising along with channel speed, some nonlinear impairments in the system channel, as SPM (Self-Phase Modulation, from phase modulated), IXPM (Intra-channel Cross-Phase Modulation, cross-phase is modulated in the channel) and IFWM (Intra-channel Four Wave Mixing, four wave mixing in the channel) etc. influence becomes apparent in view, becomes the principal element of restriction system performance gradually.SPM can make the frequency spectrum of signal and pulse obtain broadening, and the frequency spectrum of adjacent channel in DWDM (Dense Wavelength Division Multiplexing, the dense wave division multipurpose) system is overlapped; IXPM makes signal shake in time, but it is insensitive to phase place, can be suppressed effectively by suitable dispersion management; Different with IXPM, IFWM is very sensitive to phase place, and the amplitude of signal is shaken, and produces abnormal pulsers.
And the performance of CSRZ (Carrier Suppressed Return-to-Zero, Carrier-Suppressed Return-to-Zero) the anti-SPM of light signal is relatively good, and has higher dispersion tolerance; APRZ (Alternating Phase RZ, the phase change NRZ) light signal can suppress the influence that IFWM brings effectively, for the data source that will send is modulated into CSRZ light signal or APRZ light signal, several optical senders have appearred in the prior art, simply are described below:
One, CSRZ optical signal transmitter
Referring to CSRZ optical signal transmitter shown in Figure 1, the MZM (Mach-ZenderModulator, Mach-Zehnder modulator) of two series connection is arranged in this transmitter, be respectively MZM1 and MZM2, the production process of CSRZ light signal is as follows:
At first, the continuous light of laser output is by MZM 1 modulation, and output frequency is the light pulse signal of f, and the phase place between the adjacent pulse exists 0, the counter-rotating of π;
Wherein, the drive signal of this MZM1 is a radio frequency clock signal, the frequency of this radio frequency clock signal provide for data source data speed (f) 1/2, the bias voltage of this MZM1 is located at the minimum point of MZM1 transmission curve, when the amplitude of added clock signal is V
πThe time, wherein, V
πBe the half-wave voltage of modulator, the duty ratio of the light pulse of generation is 67%.
Then, light pulse signal is by MZM 2, and MZM 2 is by regulating electric variable delay line, with the data-modulated that will transmit to this light pulse signal, thereby the phasing back of generation adjacent bit is the CSRZ light signal of π.
Two, APRZ optical signal transmitter
Referring to APRZ optical signal transmitter shown in Figure 2, this transmitter mainly is made up of the modulator of three series connection, be respectively intensity modulator 1 (pulse signal generator), intensity modulator 2 (data modulator) and phase-modulator, the production process of APRZ light signal is as follows:
1) continuous light of laser generation is modulated to pulse signal by intensity modulator 1;
Wherein, the drive signal of intensity modulator 1 is that the frequency that clock source 1 produces is the clock signal of f, and through behind the intensity modulator 1, continuous light becomes the pulse signal that periodically repeats, and the frequency f of this pulse signal is identical with the speed f of the data that data source sends.As required, can change the pulsewidth of pulse, and then determine the duty ratio of the final APRZ light signal that generates.
2) pulse signal is in process intensity modulator 2, and by the data-modulated that data source sends, the speed of this data-signal is f, and output has RZ (Return-to-Zero, the NRZ) light signal of information;
Wherein, realizing by regulating electric variable delay line 1 synchronously between pulse signal and the data-signal, intensity modulator 2 outputs have the RZ light signal of information like this, the waveform of signal is determined by the shape of the pulse that intensity modulator 1 produces, the amplitude of RZ light signal is determined by the amplitude of the data that data source will send, when sending ' 1 ', amplitude is a high level, and light pulse is arranged; When sending ' 0 ', amplitude is a low level, no light pulse, and the phase place of RZ signal does not change, and is a constant.
3) phase-modulator is modulated the phase place of the RZ light signal of input by the clock signal that clock source 2 produces.
The frequency of this clock signal is half of data rate, is f/2.By regulating electric variable delay line 2, the maximum and the minimum value of clock signal amplitude are alignd with data-signal, the phase place of data-signal is modulated like this, and do cyclic variation, the cycle is 2 signal bit, the phase place difference of adjacent bit, a phase difference φ is arranged, as shown in Figure 3.By changing the amplitude of phase-modulator drive signal (clock signal), the value that can make Δ φ is a pi/2, produces the APRZ light signal.
The inventor finds that there is following problem at least in existing transmitter in realizing process of the present invention:
Existing optical signal transmitter can only produce a kind of light signal, and the structure more complicated, and the optical device of use is many, and system cost is bigger, and the ability of produced simultaneously APRZ light signal inhibition nonlinear change is also poor.
Summary of the invention
The embodiment of the invention provides the method for a kind of multi-code type light transmitter and light signal generating, can simplify the structure of APRZ and CSRZ optical signal transmitter, and suppresses the nonlinear impairments of APRZ light signal.Described technical scheme is as follows:
A kind of multi-code type light transmitter, described transmitter comprises:
The precoding processing module is used for carrying out differential coding to sent data, generates coded data, divides two-way to export described coded data;
Modulator, be used to receive the two-way coded data of input optical signal and the output of described precoding processing module, described two-way coded data is modulated, described two-way coded data is modulated on the described light signal, produces and outgoing carrier inhibition nrz optical signal or phase change nrz optical signal.
Further, the embodiment of the invention also provides a kind of method of light signal generating, and described method comprises:
Carry out differential coding to sent data, generate the two-way coded data;
Described two-way coded data is modulated, described two-way coded data is modulated on the light signal, produce Carrier-Suppressed Return-to-Zero light signal or phase change nrz optical signal.
The method that provides by present embodiment is modulated the data behind the coding then by carrying out precoding to sent data, can either produce the CSRZ light signal, also can produce the APRZ light signal; Simultaneously, the quality height of the APRZ light signal that is produced, and realize simply when reducing implementation complexity, having reduced the realization cost effectively.
Description of drawings
Fig. 1 is the structural representation of the CSRZ optical signal transmitter that provides of prior art;
Fig. 2 is the structural representation of the APRZ optical signal transmitter that provides of prior art;
Fig. 3 is APRZ photosignal waveform and the phase place schematic diagram that prior art provides;
Fig. 4 is the multi-code type light transmitter structural representation that the embodiment of the invention 1 provides;
Fig. 5 is the another kind of multi-code type light transmitter structural representation that the embodiment of the invention 2 provides;
Fig. 6 is the structural representation of the SSB modulator that provides of the embodiment of the invention 2;
Fig. 7 is that the NRZ electrical signal conversion that the embodiment of the invention 2 provides is the schematic diagram of RZ light signal;
Fig. 8 is the method flow diagram of the light signal generating that provides of the embodiment of the invention 3;
Fig. 9 is the structural representation of the SSB modulator that provides of the embodiment of the invention 3.
Embodiment
Embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention generates the two-way coded data by carrying out differential coding to sent data; Then the two-way coded data is modulated, the two-way coded data is modulated on the light signal, produce CSRZ light signal or APRZ light signal, the quality height of the APRZ light signal that is produced; And realize simply when reducing implementation complexity, having reduced the realization cost effectively.
Referring to Fig. 4, the embodiment of the invention provides a kind of multi-code type light transmitter, and this transmitter comprises:
Precoding processing module 100 is used for carrying out differential coding to sent data, generates coded data, divides the two-way outputting encoded data;
Wherein, the producing method of the two-way coded data in the present embodiment is encoded respectively to two paths of data then for earlier data to be sent being divided into two-way, and as shown in Figure 4, the precoding processing module 100 of this mode comprises:
The first precoder 100b is used to receive the circuit-switched data that demodulation multiplexer 100a exports, and a circuit-switched data is carried out differential coding, generates one tunnel coded data, exports one tunnel coded data;
The second precoder 100c is used to receive another circuit-switched data that demodulation multiplexer 100a exports, and another circuit-switched data is carried out differential coding, generates another road coded data, exports another road coded data.
Wherein, precoding processing module 100 is carried out differential coding to sent data and is realized on electric territory, data behind data before the coding and the coding all are NRZ (Non Return-to-Zero, nonreturn to zero code) form, differential coding and DPSK (Differential Phase-shift Keying, differential phase-shift keying (DPSK)) encoding mechanism is similar, this coding staff ratio juris is, former bit information before the coding is represented by the variation of former and later two bit amplitudes after encoding, that is: when prime information was ' 0 ', the amplitude of the back bit that the coding back is corresponding was identical with the amplitude of last bit, for example, if last bit be ' 0 ', afterwards a bit is for still being ' 0 '; If last bit is ' 1 ', then back one bit still is ' 1 '.When prime information was ' 1 ', the amplitude of the back bit that the coding back is corresponding was different with last bit, and even last bit is ' 0 ', and then back one bit is ' 1 '; If last bit is ' 1 ', then back one bit is ' 0 '.Data rate behind the coding remains unchanged, and is the NRZ signal, and shared bandwidth does not change;
The demodulation multiplexer of above-mentioned demodulation multiplexer 100a and common meaning is the same, is about to one road high speed signal, by string and conversion, is converted to the signal of 2 road low speed.
The transmitter that present embodiment provides is modulated the data behind the coding then by carrying out precoding to sent data, can either produce the CSRZ light signal, also can produce the APRZ light signal;
Simultaneously, the phase difference of the APRZ light signal adjacent bit of generation is a mutant form, so the quality height of the APRZ light signal that produces.
And the photoelectric device that present embodiment uses is few, and compact conformation is realized simply, when reducing system bulk, reducing implementation complexity, has reduced the cost of transmitter effectively.
Referring to Fig. 5, the embodiment of the invention provides another kind of multi-code type light transmitter, this transmitter comprises: precoding processing module 100 and modulator 200, precoding processing module 100 in the present embodiment adopts encodes to sent data earlier, data after will encoding then are divided into two-way, and this precoding processing module 100 specifically comprises:
Precoder 100d is used for carrying out differential coding to sent data, generates coded data, outputting encoded data;
Demodulation multiplexer 100e is used to receive the coded data that precoder 100d exports, and converts coded data to two-way by string and conversion, and exports the two-way coded data respectively;
Demodulation multiplexer 100e has two output ports, is respectively first output port and second output port, is used to export the two-way coded data;
Wherein, the principle that precoder 100d carries out differential coding is identical with embodiment 1, no longer describes in detail here.
Further, the precoding processing module 100 among the foregoing description 1 and the embodiment 2 also comprises:
Amplifier is used for that the coded data that generates is carried out signal and amplifies, and the coded data after the output signal amplification;
If precoding processing module 100 is a structure shown in Figure 4, two amplifiers are separately positioned between the first precoder 100b and modulator 200 and the second precoder 100c and the modulator 200, are used for the coded data after amplifying is sent to modulator 200; If precoding processing module 100 is a structure shown in Figure 5, then two amplifiers are separately positioned between second output port and modulator 200 of first output port of demodulation multiplexer 100e and modulator 200 and demodulation multiplexer 100e, and an amplifier perhaps is set between precoder 100d and demodulation multiplexer 100e.
Further, the modulator 200 that provides among embodiment 1 and the embodiment 2 can be SSB (Single Sideband, a monolateral band) modulator, and referring to Fig. 6, the SSB modulator in the present embodiment comprises:
Above-mentioned SSB modulator, also replaceable is DQPSK (Differential Quadrature Phase Shift Keying, differential quadrature phase keying (DQPSK)) modulator, quadrature modulator or vector modulator etc.
Light signal input port 200a is used for receiving optical signals, and light signal is divided into two-way;
The first sub-modulator 200b, be used for the road light signal of receiving optical signals input port 200a and one tunnel coded data of precoding processing module 100 outputs, under the effect of first bias voltage described one tunnel coded data is being modulated on above-mentioned one road light signal, produce first via NRZ signal, output first via NRZ signal;
Electricity adjustable delay wire module 200c, be used to receive another road coded data of precoding processing module 100 outputs, another road coded data is carried out time delay, make the time delay of described another road coded data and described one tunnel coded data generation preset length, the coded data of delaying during output; Wherein, the time delay of preset length can postpone T/2 for the coded data that makes the coded data that is input to the second sub-modulator 200d be input to the first sub-modulator 200b, and wherein, T is the time that bit is shared;
The second sub-modulator 200d, the time coded data delayed that is used for another road light signal of receiving optical signals input port 200a and electric adjustable delay wire module 200c output, under the effect of second bias voltage will the time coded data delayed be modulated on another road light signal, produce the second road NRZ signal, export the second road NRZ signal;
Close road module 200e, be used to receive the first via NRZ signal of the first sub-modulator 200b output and the second road NRZ signal of the second sub-modulator 200d output, after making the first via NRZ signal and the second road NRZ signal close the road under the effect of the 3rd bias voltage, produce CSRZ light signal or APRZ light signal.
The above-mentioned first sub-modulator 200b and the second sub-modulator 200d can realize by MZM, the first sub-modulator 200b and the second sub-modulator 200d data after by the radio-frequency (RF) signal input end mouth received code on it.The performance of these two sub-modulators is identical with single driving MZM, by bias voltage is set, can make it be operated in different operating states.For example, when the peak of bias voltage, produce duty ratio near 30% RZ light signal at transmission curve; When bias voltage during, produce phase-shift keyed signal in minimum point; When bias voltage when orthogonal points (intermediate point), produce the NRZ signal of telecommunication.In the embodiment of the invention, the amplitude of the rf inputs mouth signal of the above-mentioned first sub-modulator 200b and the second sub-modulator 200d is set to 2V
π, V wherein
πHalf-wave voltage for this SSB modulator, first bias voltage and second bias voltage are arranged on the peak of transmission curve, make the first sub-modulator and the second sub-modulator produce the RZ light signal, the information that this RZ light signal comprises is the data message before the coding, promptly automatically realizing that the NRZ signal of telecommunication when the RZ light signal is changed, realized decoding on the light territory;
The two-way RZ light signal that the first sub-modulator 200b and the second sub-modulator 200d produce is realized closing the road with time-multiplexed form closing in the module 200e of road of modulator, and closing the data rate of exporting behind the road is 2f, and duty ratio is near 60%;
Can accurately control the phase difference of light signal on two branch roads of the first sub-modulator 200b and second sub-modulator 200e output by the 3rd bias voltage of modulator, make the adjacent bit of output signal keep a constant phase difference, as π, pi/2 etc., thereby produce required CSRZ light signal or APRZ light signal.
Referring to Fig. 7, the NRZ signal of telecommunication that the coding back produces is through electric amplifier, and the amplitude that makes output signal is at 2V
πAbout, V wherein
πHalf-wave voltage for this SSB modulator.If at this moment the bias point with MZM is located at the transmission curve peak, pass through MZM so after, output duty cycle is about 30% RZ light signal.And the content of RZ light signal is corresponding one by one with the preceding NRZ signal of telecommunication of encoding.Suppose that the bit information before the coding is ' 01110100 ', the bit information behind its coding is ' 01011000 ', and the bit information that the modulation back generates is ' 01110100.
The modulator that present embodiment provides by Fig. 6, the coded data of precoding processing module 100 is loaded on the first sub-modulator 200b and the second sub-modulator 200d with lower speed (for example 20Gb/s) respectively, wherein one tunnel coded data is through an electric adjustable delay wire module 200c, make two paths of data that be arranged the relative time delay of a T/2, T is the time that bit is shared, for example: a bit period of 20Gb/s data.After modulation, it is 30% 20Gb/s RZ light signal that two MZM produce duty ratio respectively, and the phase place of signal is respectively φ
1And φ
2, by in time close the road after, generate duty ratio and be 60% 40Gb/s RZ light signal.By the size of the 3rd bias voltage is set, can make between the RZ light signal phase place of two-way 20Gb/s a phase difference is arranged, thereby make between the signal adjacent bit of 40Gb/s of generation and remain a constant phase difference φ, as π, pi/2 etc., thus needed CSRZ light signal or APRZ light signal produced.
The optical sender that present embodiment provides is modulated the data behind the coding then by carrying out precoding to sent data, can either produce the CSRZ light signal, also can produce the APRZ light signal; And CSRZ optical signal transmitter of the prior art can only produce the CSRZ light signal, and can not produce the APRZ light signal;
Simultaneously, the phase difference of the APRZ light signal adjacent bit of generation is a mutant form, so the quality height of the APRZ light signal that produces; And the phase place of the APRZ light signal adjacent bit that existing APRZ optical signal transmitter produces changes with sinusoidal manner, change procedure is slow, be sinusoidal APRZ light signal, rather than proper APRZ light signal, thereby reduced the ability of signal suppressing nonlinear change.
And the photoelectric device that the optical sender that present embodiment provides uses is few, and compact conformation is realized simply, when reducing system bulk, reducing implementation complexity, has reduced the cost of transmitter effectively; And the general more complicated of the implementation of APRZ optical signal transmitter of the prior art, the photoelectric device of use is many, and system cost is big; The APRZ transmitter shown in Fig. 2 for example, three modulators have been used, be used for producing light pulse signal, modulating data and phase modulation respectively, synchronous for what realize modulating, need to use two electric variable delay lines, and need a frequency divider (perhaps frequency multiplier) to produce two clock signals of different frequencies.
Embodiment 3
Present embodiment provides a kind of method of light signal generating, and this method is carried out differential coding to sent data, generates the two-way coded data; Respectively the two-way coded data is modulated then, the two-way coded data is modulated on the light signal, produce CSRZ light signal or APRZ light signal; Referring to Fig. 8, this method specifically comprises:
Step 101: carry out differential coding to sent data, generate the two-way coded data;
Wherein, generating the two-way coded data can realize by dual mode:
1) by string and conversion data transaction to be sent is become two paths of data, respectively two paths of data is carried out differential coding then, generate the two-way coded data;
2) carry out differential coding to sent data, generate coded data, convert coded data to two-way by string and conversion then, obtain the two-way coded data;
Further, the two-way coded data of generation can be made suitable processing and amplifying as required.
Step 102: before modulating data, make the road coded data that is input to modulator through an electric variable delay line, regulate this delay line, make the time delay that produces T/2 between the two-way coded data that is input to modulator, wherein T is the time that bit is shared.
Step 103: modulator is divided into two-way with the light signal that receives, and exports to the first sub-modulator and the second sub-modulator respectively;
Wherein, modulator is made up of two parallel sub-modulators of placing, and is used for respectively coded data being modulated at two ways of optical signals.
Step 104: the first sub-modulator is being modulated to one tunnel coded data on one road light signal under the effect of first bias voltage, produces first via NRZ signal.
Step 105: the second sub-modulator under the effect of second bias voltage will the time coded data delayed be modulated on another road light signal, produce the second road NRZ signal.
Step 106: modulator produces CSRZ light signal or APRZ light signal after making the first via NRZ signal and the second road NRZ signal close the road under the effect of the 3rd bias voltage.
Order does not have strict restriction before and after the step of said method, is for convenience and the mark of doing, and for example, the front and back of step 104 and step 105 can exchange in proper order.
Modulator in the present embodiment is an example with the SSB modulator, referring to Fig. 9, the SSB modulator that this SSB modulator and above-mentioned Fig. 6 are provided is similar, form by two MZM, be respectively MZMA and MZMB, bias voltage is respectively A and B, and the bias voltage of whole SSB modulator is set to C, by regulating bias voltage C, can change the phase difference between the light signal of MZMA and MZMB output.The data source of present embodiment is an example with the coded data of 20Gb/s, make the time delay that produces preset length between the coded data of importing MZMA and MZMB by electric variable delay line, during modulating data, respectively bias voltage A and B are arranged on the peak of MZMA and MZMB transmission curve, the light signal of each MZM output of modulation back is a RZ light signal, duty ratio is about 30%, and data rate is f.The two-way RZ signal that MZMA and MZMB produce is realized closing the road with time-multiplexed form in SSB modulator inside, and closing the data transfer rate of exporting behind the road is 2f, and duty ratio is near 60%.By bias voltage C is set, can make the adjacent bit of output signal keep a constant phase difference, as π, pi/2 etc., thereby produce required CSRZ light signal or APRZ light signal.
The method that present embodiment provides is modulated the data behind the coding then by carrying out precoding to sent data, can either produce the CSRZ light signal, also can produce the APRZ light signal;
Simultaneously, the phase difference of the APRZ light signal adjacent bit of generation is a mutant form, so the quality height of the APRZ light signal that produces;
And present embodiment is realized simple, when reducing implementation complexity, has reduced the realization cost effectively.
All or part of content in the technical scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a multi-code type light transmitter is characterized in that, described transmitter comprises:
The precoding processing module is used for carrying out differential coding to sent data, generates coded data, and the described coded data of output two-way;
Modulator, be used to receive the light signal of input and the two-way coded data of described precoding processing module output, described two-way coded data is modulated, described two-way coded data is modulated on the described light signal, produces and outgoing carrier inhibition nrz optical signal or phase change nrz optical signal.
2. multi-code type light transmitter as claimed in claim 1 is characterized in that, described precoding processing module comprises:
Demodulation multiplexer is used for by string and conversion described data transaction to be sent being become two paths of data, exports described two paths of data respectively;
First precoder is used to receive the circuit-switched data that described demodulation multiplexer is exported, and a described circuit-switched data is carried out differential coding, generates one tunnel coded data, exports described one tunnel coded data;
Second precoder is used to receive another circuit-switched data that described demodulation multiplexer is exported, and described another circuit-switched data is carried out differential coding, generates another road coded data, exports described another road coded data.
3. multi-code type light transmitter as claimed in claim 1 is characterized in that, described precoding processing module comprises:
Precoder is used for described data to be sent are carried out differential coding, generates coded data, exports described coded data;
Demodulation multiplexer is used to receive the coded data that described precoder is exported, and converts described coded data to two-way by string and conversion, and exports the two-way coded data respectively.
4. multi-code type light transmitter as claimed in claim 1 is characterized in that, described precoding processing module also comprises:
Amplifier is used for that the coded data that generates is carried out signal and amplifies, and the coded data after the output signal amplification.
5. multi-code type light transmitter as claimed in claim 1 is characterized in that, described modulator comprises:
The light signal input port is used for receiving optical signals, and described light signal is divided into two-way;
The first sub-modulator, be used to receive one road light signal of described light signal input port and one tunnel coded data of described precoding processing module output, under the effect of first bias voltage described one tunnel coded data is being modulated on described one road light signal, produce first via NRZ signal, export described first via NRZ signal;
Electricity adjustable delay wire module, be used to receive another road coded data of described precoding processing module output, described another road coded data is carried out time delay, make the time delay of described another road coded data and described one tunnel coded data generation preset length, the coded data of delaying during output;
The second sub-modulator, be used to receive the time coded data delayed of another road light signal of described light signal input port and described electric adjustable delay wire module output, the coded data of delaying when described under the effect of second bias voltage is modulated on described another road light signal, produce the second road NRZ signal, export described the second road NRZ signal;
Close the road module, be used to receive the first via NRZ signal of the described first sub-modulator output and the second road NRZ signal of the second sub-modulator output, after making described first via NRZ signal and described the second road NRZ signal close the road under the effect of the 3rd bias voltage, generate Carrier-Suppressed Return-to-Zero light signal or phase change nrz optical signal.
6. the method for a light signal generating is characterized in that, described method comprises:
Carry out differential coding to sent data, generate the two-way coded data;
Described two-way coded data is modulated, described two-way coded data is modulated on the light signal, produce Carrier-Suppressed Return-to-Zero light signal or phase change nrz optical signal.
7. the method for light signal generating as claimed in claim 6 is characterized in that, describedly carries out differential coding to sent data, and the step that generates the two-way coded data comprises:
By string and conversion described data transaction to be sent is become two paths of data;
Respectively described two paths of data is carried out differential coding, generate the two-way coded data.
8. the method for light signal generating as claimed in claim 6 is characterized in that, describedly carries out differential coding to sent data, and the step that generates the two-way coded data comprises:
Carry out differential coding to sent data, generate coded data;
Convert described coded data to two-way by string and conversion, obtain the two-way coded data.
9. the method for light signal generating as claimed in claim 6 is characterized in that, also comprises after the step of described generation two-way coded data:
Described coded data is carried out signal amplify, obtain the coded data after signal amplifies.
10. the method for light signal generating as claimed in claim 6 is characterized in that, described described two-way coded data is modulated, and the step that described two-way coded data is modulated on the light signal comprises:
Receiving optical signals, and described light signal is divided into two-way;
Under the effect of first bias voltage one tunnel coded data is being modulated on one road light signal, is producing first via NRZ signal;
Another road coded data is carried out time delay, make described another road coded data and described one tunnel coded data produce the time delay of preset length, under the effect of second bias voltage will the time coded data delayed be modulated on another road light signal, produce the second road NRZ signal;
After making described first via NRZ signal and described the second road NRZ signal close the road under the effect of the 3rd bias voltage, produce Carrier-Suppressed Return-to-Zero light signal or phase change nrz optical signal.
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| CN102237930A (en) * | 2010-05-06 | 2011-11-09 | 中兴通讯股份有限公司 | Device and method for processing clock modulation format |
| CN102520486A (en) * | 2011-12-01 | 2012-06-27 | 浙江大学 | Multi-functional device based on dual Mach-Zehnder interference structures |
| CN102684791A (en) * | 2011-03-18 | 2012-09-19 | 烽火通信科技股份有限公司 | Wired and wireless converged communication system, wired and wireless converged communication method and method and device for generating multi-waveband signals |
| CN104467978A (en) * | 2014-12-01 | 2015-03-25 | 华中科技大学 | Optical transmitter supporting multiple modulation formats and control method |
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