CN1819492A - Single modulator realizing method of light modulating signal with return-to-zero-difference phase-shifting key control - Google Patents
Single modulator realizing method of light modulating signal with return-to-zero-difference phase-shifting key control Download PDFInfo
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- CN1819492A CN1819492A CNA2006100247211A CN200610024721A CN1819492A CN 1819492 A CN1819492 A CN 1819492A CN A2006100247211 A CNA2006100247211 A CN A2006100247211A CN 200610024721 A CN200610024721 A CN 200610024721A CN 1819492 A CN1819492 A CN 1819492A
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Abstract
The method includes: 1) after a pre-coding process, the inputted data and synchronized clock signal forms a pulse polarity weighted three-level signal; 2) after a driving amplification is made for the pulse polarity weighted three-level signal generated from a pre-coding process, its small amplitude signal is amplified up to a modulator voltage being two times of peak value; 3) with optical modulation, the signal generated from pre-coding is mapped to a amplitude and phase of optical carrier wave; the modulated optical signal is a zero light-pulse sequence modulated by inputted data of light carrier phase. When the inputted data is '0', the light carrier phase of zero pulse produces 'pi'phase jump, and when the inputted data is '1', the light carrier pulse of zero pulse produces no phase jump so that carrier return to zero -differential phase shift keying light modulation signal is implemented.
Description
Technical field
What the present invention relates to is a kind of method of technical field of optical fiber communication, specifically, is that the single light modulation of a kind of usefulness realizes making zero-method of differential phase keying (DPSK) (RZ-DPSK) light modulating signal.
Background technology
Along with the development of Fibre Optical Communication Technology, many novel modulation formats have been used to the raising system to CHROMATIC DISPERSION IN FIBER OPTICS and nonlinear carrying capacity.In recent years, (RZ-DPSK) and the carrier suppressed of making zero-differential phase keying (DPSK) make zero-and two kinds of modulation formats based on differential phase keying (DPSK) (DPSK) of differential phase keying (DPSK) (CSRZ-DPSK) are introduced in the fiber optic communication field, because this modulation format can obtain the enhancing of 3dB receiving sensitivity (in linear system by differential received, mean the transmission range that can prolong a times), and show very superior carrying capacity to nonlinear fiber, improved the transmittability of optical fiber telecommunications system effectively.Present many record transmission experiment overwhelming majority are based on this modulation format, therefore these two kinds of sign indicating number types have caused that industry pays close attention to greatly, it is the modulation format of transmission performance optimum in the existing optical modulation formats that these two kinds of sign indicating number types are known as by industry, and huge market application foreground is arranged.But, because these two kinds of modulation formats need two modulators to generate, one is used to generate RZ (or CSRZ) light pulse, another then is used for the differential phase keying (DPSK) modulation of realization to RZ (or CSRZ) light pulse, because modulator and driver thereof have occupied the overwhelming majority of transmitter cost, therefore realization cost height, the complex structure of the transmitter of these two kinds of modulation formats have influenced its market prospects.
Find through retrieval the prior art document, people such as Xiang Liu are published in the interim article " Chirped RZ-DPSK Based on Single Mach-Zehnder Modulator andIts Nonlinear Transmission Performance " of academic journals " IEEEPhotonics Technology Letters " (" IEEE photon technology wall bulletin ") 2005 the 17th volume the 7th (" warble make zero-single Mach-Zehnder modulation of differential phase keying (DPSK) sign indicating number generate and the nonlinear transport performance "), a kind of electric precoding mode based on the analog differential amplifier is proposed, realize the scheme of the RZ-DPSK sign indicating number emission of warbling of single-stage modulator, the difficult point of this scheme need to be at a high speed, the analog differential amplifier in broadband, this class device technology realizes that difficulty is big, does not see the commercial devices that can satisfy these needs at present.Also find in the retrieval, people such as Yang Jing Wen be published in article " RZ/CSRZ-DPSK and Chirped NRZ Signal Generation Usinga Single-Stage Dual-Electrode Mach-Zehnder Modulator " in academic journals " IEEE Photonics Technology Letters " (" IEEE photon technology wall bulletin ") 2004 the 16th volume o. 11th (" utilize single bipolar electrode Mach-Zehnder modulator realize making zero/the carrier wave compression makes zero-the differential phase keying (DPSK) sign indicating number and the nonreturn to zero code of warbling ") in, proposed a kind of by input data and clock are carried out the merit branch, postpone and close preliminary treatment such as ripple, realize the scheme of the RZ-DPSK sign indicating number emission of single-stage modulator, its difficult point is that this precoding process is complicated, impedance matching there is high requirement, is easy to cause signal distortion.
Summary of the invention
The objective of the invention is to realization cost height and complicated problems at existing RZ-DPSK modulation format, propose the single-stage modulator implementation method of a kind of making zero-differential phase keying (DPSK) light modulating signal, make it can effectively lower the cost and the complexity of present RZ-DPSK transmitter.
The present invention is achieved by the following technical solutions, may further comprise the steps:
(1) data of differential coding and clock signal synchronous are by forming the three level signal of pulse polarity weighting after the precoding processing, and the polarity of precoding output signal becomes according to input signal, the corresponding input of positive polarity " 1 " data " 1 "; The corresponding input of negative polarity " 1 " data " 0 ".
(2) three level signal of the pulse polarity weighting of precoding generation is through the amplification of overdriving, and the signal that amplitude is less is amplified to the modulator V that peak-to-peak value is a twice
πVoltage.
(3) be mapped on the amplitude and phase place of light carrier by the three level signal of light modulation with the pulse polarity weighting, the light signal after the modulation is transfused to the light pulse sequence that makes zero of data-modulated for the light carrier phase place.When the input data were " 0 ", " π " phase hit took place in the light carrier phase place of return-to-zero pulse, and when the input data were " 1 ", saltus step did not take place the light carrier phase place of return-to-zero pulse, and Here it is makes zero-differential phase keying (DPSK) (RZ-DPSK) light modulating signal.
Described precoding process comprises: phase shift, XOR (XOR) operation, analog addition and low-pass filtering.After at first aiming at the center of its signal by phase shift constantly, the data of input and synchronous clock carry out XOR (XOR) operation.Signal behind the XOR is simulated sum operation with data in synchronization again, generates three level signal.Then, be shaped as the three level signal of pulse polarity weighting through low-pass filtering.
Described light modulation, the optical modulator of employing Mach-Zehnder structure, its bias point is arranged at V
πPoint, driving voltage are 2V
πVoltage, thus make the light signal after modulating be transfused to the light pulse sequence that makes zero of data-modulated for the light carrier phase place.When the input data were " 0 ", " π " phase hit took place in the light carrier phase place of return-to-zero pulse, and when the input data were " 1 ", saltus step did not take place the light carrier phase place of return-to-zero pulse.
Different with the generating mode of traditional NRZ-differential phase keying (DPSK) (RZ-DPSK) sign indicating number, the present invention adopts the mode of the precoding of electricity at first will import the three level signal that data and clock signal are converted to the pulse polarity weighting, three level signal with this pulse polarity weighting drives single Mach-Zehnder optical modulator then, generates to make zero-differential phase keying (DPSK) (RZ-DPSK) sign indicating number.With respect to the generating mode of traditional RZ-DPSK sign indicating number, the present invention not only can save cover modulator and a driver, and precoder realize simple, be easy to integratedly, so the present invention can be lowered the cost and the complexity of RZ-DPSK optical sender effectively.
Description of drawings
Fig. 1 is an embodiment of the invention schematic diagram.
Fig. 2 is that precoding realizes schematic diagram in the embodiment of the invention.
Fig. 3 is the invention process procedure chart
Wherein, a) for importing the data-signal of precoder; B) for importing the clock signal of precoder; C) be XOR gate output signal in the precoder; D) be the three level signal of analog adder output in the precoder; E) be the three level signal of the pulse polarity weighting after the filter shaping in the precoder; F) the RZ-DPSK sign indicating number waveform for generating through optical modulator; G) the RZ-DPSK eye pattern for generating through optical modulator.
The implementation result figure of Fig. 4 embodiment
Wherein, a) modulation spectrum of the RZ-DPSK of the present invention and traditional generating mode; B) characteristic is held in the chromatic dispersion of the RZ-DPSK of the present invention and traditional generating mode.
Embodiment
As shown in Figure 1, the parts of embodiment of the invention employing relate to precoder, laser, Mach-Zehnder optical modulator and driver.Data and clock that precoder is handled input form the three level signal of pulse polarity weighting, and after sending into driver and amplifying, radio frequency (RF) port of input Mach-Zehnder optical modulator is modulated light carrier, forms the RZ-DPSK light modulating signal.The specific implementation step is as follows:
(1) as shown in Figure 2, the realization of precoding process relates to 3dB power divider, phase shifter, XOR gate, analog adder and low pass filter.The data (shown in Fig. 3 a) of input at first are divided into the identical two-way of power by 3dB power divider (can directly realize or adopt the Model5331 of Picosecond on PCB).The clock of input through phase shifter (can be directly realize on the PCB or adopt Micronetics 4305) adjust and postpone and in XOR gate, carry out xor operation after wherein a circuit-switched data (shown in Fig. 3 b) is aimed at, the xor operation result is shown in Fig. 3 c, and XOR gate can adopt the 13710XR of INPHI to realize.Signal and another circuit-switched data of XOR output are simulated addition in analog adder, form three level signal (shown in Fig. 3 d), analog adder can realize that the Model5500A of Picosecond can directly be realized or adopt to block isolating device by 3dB power divider and block isolating device on PCB.This three level signal further is admitted to low pass filter and carries out shaping, forms the three level signal (shown in Fig. 3 e) of pulse polarity weighting.The Model 5925 of Picosecond can directly be realized or adopt to low pass filter on PCB.
(2) to be amplified to peak-to-peak value be optical modulator 2V to the three level signal of driver pulse polarity weighting that the amplitude of precoding output is less
πVoltage, and send into radio frequency (RF) port of modulator.Driver can adopt the VM10EMD of JDS-Uniphase to realize.
(3) the Mach-Zehnder optical modulator can adopt the LNB-KR1CX of JDS-Uniphase to realize that its bias voltage is arranged on V
πPoint, optical modulator is mapped to the three level signal of pulse polarity weighting on the amplitude and phase place of light carrier, and the light signal after the modulation is transfused to the light pulse sequence that makes zero of data-modulated for the light carrier phase place.When the input data were " 0 ", " π " phase hit took place in the light carrier phase place of return-to-zero pulse, and when the input data were " 1 ", saltus step did not take place the light carrier phase place of return-to-zero pulse, thereby generated RZ-DPSK sign indicating number (shown in Fig. 3 f, 3g).
From Fig. 3 g as can be known, the RZ-DPSK sign indicating number of the present invention's generation is identical with the RZ-DPSK that tradition generates.From the modulation spectrogram shown in Fig. 4 a as can be known, modulation spectrum secondary lobe of the present invention is lower than traditional generating mode.The chromatic dispersion of the RZ-DPSK that is generated by the present invention is held characteristic shown in Fig. 4 b, and characteristic is held in the chromatic dispersion that has listed file names with traditional approach as a comparison among the figure.By the diagram result as can be known, the present invention does not only bring chromatic dispersion to hold cost, makes moderate progress but also characteristic is held in chromatic dispersion.
Claims (3)
1, the single-stage modulator implementation method of a kind of making zero-differential phase keying (DPSK) light modulating signal is characterized in that, may further comprise the steps:
(1) Shu Ru data and clock signal synchronous are by forming the three level signal of pulse polarity weighting after the precoding processing, the polarity of precoding output signal becomes according to input signal, the corresponding input of positive polarity " 1 " data " 1 ", the corresponding input of negative polarity " 1 " data " 0 ";
(2) three level signal of the pulse polarity weighting of precoding generation is through the amplification of overdriving, and the signal that amplitude is less is amplified to the modulator V π voltage that peak-to-peak value is a twice;
(3) be mapped on the amplitude and phase place of light carrier by the three level signal of light modulation the pulse polarity weighting, light signal after the modulation is transfused to the light pulse sequence that makes zero of data-modulated for the light carrier phase place, when the input data are " 0 ", " π " phase hit takes place in the light carrier phase place of return-to-zero pulse, when the input data are " 1 ", saltus step does not take place in the light carrier phase place of return-to-zero pulse, and Here it is makes zero-the differential phase keying (DPSK) light modulating signal.
2, the single-stage modulator implementation method of as claimed in claim 1 making zero-differential phase keying (DPSK) light modulating signal, it is characterized in that, described precoding process comprises: phase shift, xor operation, simulation addition and low-pass filtering, after at first aiming at its signal center by phase shift constantly, the data of input and synchronous clock carry out xor operation, signal behind the XOR is simulated sum operation with the data of input again, generate three level signal, be shaped as the three level signal of pulse polarity weighting again through low-pass filtering.
3, the single-stage modulator implementation method of as claimed in claim 1 making zero-differential phase keying (DPSK) light modulating signal is characterized in that, described light modulation, and the optical modulator of employing Mach-Zehnder structure, its bias point is arranged at V
πPoint, driving voltage are 2V
πVoltage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008124982A1 (en) * | 2007-04-12 | 2008-10-23 | Zte Corporation | A device and method to produce an optical modulating signal of rz-dpsk |
| CN101896855B (en) * | 2007-10-10 | 2013-04-03 | 日本电气株式会社 | Optical modulator and optical communication system |
| CN109547159A (en) * | 2018-11-13 | 2019-03-29 | 武汉邮电科学研究院有限公司 | The loading method and system of AMCC signal |
-
2006
- 2006-03-16 CN CNA2006100247211A patent/CN1819492A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008124982A1 (en) * | 2007-04-12 | 2008-10-23 | Zte Corporation | A device and method to produce an optical modulating signal of rz-dpsk |
| CN101896855B (en) * | 2007-10-10 | 2013-04-03 | 日本电气株式会社 | Optical modulator and optical communication system |
| CN109547159A (en) * | 2018-11-13 | 2019-03-29 | 武汉邮电科学研究院有限公司 | The loading method and system of AMCC signal |
| CN109547159B (en) * | 2018-11-13 | 2021-08-24 | 武汉邮电科学研究院有限公司 | AMCC signal loading method and system |
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