CN1316763C - Duty ratio adjustable high-speed optical return-to-zero code generation method and its equipment - Google Patents
Duty ratio adjustable high-speed optical return-to-zero code generation method and its equipment Download PDFInfo
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- CN1316763C CN1316763C CNB031100384A CN03110038A CN1316763C CN 1316763 C CN1316763 C CN 1316763C CN B031100384 A CNB031100384 A CN B031100384A CN 03110038 A CN03110038 A CN 03110038A CN 1316763 C CN1316763 C CN 1316763C
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Abstract
The present invention relates to a method and a device for degenerating high-speed optical return-to-zero codes with adjustable duty ratio, which belongs to the technical field of optical communication. The method comprises the procedures: a clock modulator outputs, by modulation, pulse strings with different pulse width by adjusting the offset working point of the clock modulator in the electro-optical modulation of optical return-to-zero codes adopting a cascaded modulator, so that optical zero adjustment with corresponding duty ratio is obtained; the offset working point is adjusted by adjusting the voltage on an offset electrode of the clock modulator; the clock modulator receives external adjusting signals through a working point adjusting module, and proper offset voltage is conveyed to the offset electrode of the clock modulator after the adjusting signals are processed by an internal central control unit (CPU) and converted from digital to analog. The present invention which can adjust the duty ratio of optical return-to-zero codes enables a system to acquire good transmission performance, and brings high flexibility to system design.
Description
Technical field
The present invention relates to optical communication technique, relate in particular to a kind of EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method and device.
Background technology
In the over distance optical transmission system, optical link sign indicating number type adopts the RZ sign indicating number that makes zero usually, and the RZ sign indicating number generating technique scheme that typically makes zero has two kinds:
Technical scheme one:
As shown in Figure 1, electricity layer multiplexing chip also provides synchronous cosine clock output in dateout, then, clock and data are delivered to simultaneously at a high speed with in the door and carried out logic and operation, in data is 1 o'clock, cosine impulse is by exporting with door, and data are 0 o'clock, are output as 0 with door, so just produced electric rz signal, this electric NRZ is amplified to suitable voltage by driver again, drives electrooptic modulator, with continuous light modulation becoming light return-to-zero code signal.
Technical scheme two:
As shown in Figure 2, electricity layer multiplexing chip outputting data signals and the cosine clock synchronous with it, then, clock and data are delivered on the electrooptic modulator of two cascades by driver.First order electrooptic modulator is driven by clock, and here continuous light is modulated into the cosine impulse string, i.e. the RZ pulse train; Second level electrooptic modulator is by data-driven, and data 1 and 0 are controlled the modulator Push And Release respectively, has finished logic and operation in fact, and the RZ pulse train just is modulated into to RZ code optical signal under 1 and 0 control.
In essence, the principle of scheme one and scheme two is consistent, all be the data of electricity layer multiplexing chip output and cosine clock to be done logic and operation obtain NRZ, difference be light-to-current inversion be placed on computing after or and carry out simultaneously with computing.Because the light return-to-zero pulse derives from the cosine clock of digit chip output, so in current practical application, these two kinds of schemes all can not produce the light return-to-zero code of EDM Generator of Adjustable Duty Ratio.Pulse train as shown in Figure 3 and data-signal and light return-to-zero code schematic diagram, pulsewidth shown in this Fig is the light pulse width between half-power points, and the ratio of pulsewidth and period T promptly is the duty ratio of light return-to-zero code.
The existing light light return-to-zero code device duty ratio that RZ sign indicating number generating technique obtains that makes zero is normally nonadjustable, owing to use cosine impulse, duty ratio is generally 50%.Yet for obtaining better transmission property, system can ask EDM Generator of Adjustable Duty Ratio possibly in many application scenarios, and as adopting littler duty ratio, this is based on following reason:
1, duty ratio is little, and under the then same average power, peak power is higher, more helps producing nonlinear interaction and dispersion interaction balance, thereby realizes long Distance Transmission;
2, under the little then same average power of duty ratio, the extinction ratio height more can be resisted interference such as noise.Yet prior art can not realize the adjustment of duty ratio, and at this moment system has lost the leeway of optimizing performance.
Summary of the invention
The object of the present invention is to provide a kind of EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method and device, can not realize the shortcoming that duty ratio is adjusted to solve in the prior art.
EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method of the present invention is: in the light that adopts cascaded modulator makes zero RZ sign indicating number electrooptic modulation, described cascaded modulator comprises a clock modulator and a data modulator, by adjusting the wherein offset operation point of clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths, RZ sign indicating number thereby the light of obtaining corresponding duty ratio makes zero;
The light of described cascaded modulator makes zero in the RZ sign indicating number electrooptic modulation, adjusts its offset operation point by the voltage on the bias electrode Bias that adjusts the clock modulator;
Described clock modulator receives outside adjustment signal by the working point adjusting module, and this adjusts signal after central control unit CPU processing wherein, by digital-to-analogue conversion, suitable bias voltage is delivered on the bias electrode Bias of clock modulator.
Have duty ratio and bias voltage relation table in the adjusting module of described working point, after communication interface passes to central control unit CPU with the duty ratio numerical value that requires, central control unit CPU is by this table of inquiry, and the driving digital-to-analogue conversion is exported corresponding bias voltage and delivered to the clock modulator;
Described duty ratio and bias voltage relation table are to drive digital-to-analogue conversion by central control unit CPU by the increasing or decreasing mode, in the enterprising line scanning of all probable values of bias voltage, measure each operating voltage numerical value correspondence light return-to-zero code duty ratio and obtain.
The EDM Generator of Adjustable Duty Ratio high-speed light NRZ generation device of the above-mentioned light return-to-zero code production method of this realization, the clock modulator and the data modulator that comprise cascade, and corresponding clock driver and data driver, bias point generation module with data modulator, it is characterized in that: the working point adjusting module that also comprises the clock modulator, this working point adjusting module is by central control unit CPU, communication interface and D/A converter module are formed, wherein, communication interface receives outside adjustment signal, this adjusts signal after central control unit CPU handles, carry bias voltage by D/A converter module to the clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths, thereby obtain the light return-to-zero code of corresponding duty ratio at output;
Be provided with duty ratio and bias voltage relation table in the adjusting module of described working point;
The bias point generation module of described data modulator receives the feedback of exporting light, control data modulator offset operation point by optical splitter.
Beneficial effect of the present invention is: in the present invention, by adjusting the offset operation point of clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths, the RZ sign indicating number thereby the light of obtaining corresponding duty ratio makes zero, by adjusting RZ pulse pulsewidth, reach the purpose of adjusting the light return-to-zero code duty ratio, make system obtain more excellent transmission performance, also bring greater flexibility simultaneously to system design.
Description of drawings
Fig. 1 is for producing the light RZ sign indicating number technical scheme one that makes zero in the prior art;
Fig. 2 is for producing the light RZ sign indicating number technical scheme two that makes zero in the prior art;
Fig. 3 is pulse train and data-signal and a light return-to-zero code schematic diagram in the prior art;
Fig. 4 is a principle of the invention schematic diagram;
Fig. 5 is an electrical block diagram of the present invention;
Fig. 6 is that clock modulator working point pulse train when b produces schematic diagram;
Fig. 7 is clock modulator working point pulse train schematic diagram and corresponding data-signal and light when the b RZ sign indicating number eye pattern that makes zero;
Fig. 8 is that clock modulator working point pulse train when b ' produces schematic diagram;
Fig. 9 is clock modulator working point pulse train schematic diagram and corresponding data-signal and light when b ' the RZ sign indicating number eye pattern that makes zero.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
According to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, the present invention includes the clock modulator and the data modulator of two-level concatenation, the first order is the clock modulator, the second level is data modulator, each grade modulator all comprises RF signal input port and bias electrode Bias, clock driver 2 and data driver 3 drive cosine clock and data respectively, constitute the Mach-Zhe De MZ electrooptic modulator 1 of cascade, the bias point generation module 5 of data modulator receives the feedback of output light by optical splitter, control data modulator offset operation point, 3% feedback that this bias point generation module 5 receives output light realizes the stable control to offset operation point; The working point adjusting module 4 that also comprises the clock modulator in the system, this working point adjusting module 4 is made up of central control unit CPU42, communication interface 43 and D/A converter module 41, wherein, communication interface 43 receives outside adjustment signal, this adjusts signal after central control unit CPU42 handles, carry bias voltage by D/A converter module 41 to the clock modulator, be provided with duty ratio and bias voltage relation table in the working point adjusting module 4.
In the present invention, adjust the offset operation point of clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths by the voltage on the bias electrode Bias that adjusts the clock modulator, thereby at the light that output the is obtained corresponding duty ratio RZ sign indicating number that makes zero.
Its detailed process is: the clock modulator receives outside adjustment signal by the communication interface in the working point adjusting module 4 43, communication interface 43 will be adjusted the desired duty ratio numerical value of signal and pass to central control unit CPU, central control unit CPU is by inquiry duty ratio and bias voltage relation table, driving the corresponding bias voltage of D/A converter module 41 outputs delivers on the bias electrode Bias of clock modulator, at last, the light of obtaining corresponding duty ratio at the output RZ sign indicating number that makes zero.Here, duty ratio and bias voltage relation table are to drive digital-to-analogue conversion by central control unit CPU by the increasing or decreasing mode, in the enterprising line scanning of all probable values of bias voltage, measure each operating voltage numerical value correspondence light return-to-zero code duty ratio and obtain, the all duty ratios and the corresponding data of bias voltage are stored in this duty ratio and the bias voltage relation table, and central control unit CPU can call this table of inquiry as required.
For example, the working point of MZ electrooptic modulator 1 is arranged on half-power point, i.e. b as shown in Figure 6, c point, the b point refers to first order modulator working point, and the c point refers to modulator working point, the second level, adds the data and the clock signal of point on this working point, as shown in Figure 7, just can realize the light return-to-zero code of 50% duty ratio, the indicated projection of arrow is because data-signal has certain rising edge among Fig. 7, thereby second level modulator was turn-offed at once at 1 to 0 o'clock cause.
By adjusting the working point of the first order, it is the working point of clock modulator, can obtain difform pulse train, as Fig. 8 and shown in Figure 9, when b ' is adjusted to by b in the working point of clock modulator, owing to the pulse train that the output generation that makes MZ electrooptic modulator 1 has certain intervals is not amplified in the bottom of clock signal, comparison diagram 6 successive pulse groups can be known and see that both distinguish, and are as shown in Figure 9, apparent, this moment, pulsewidth was less than the RZ sign indicating number pulsewidth among Fig. 7, thereby duty ratio reduces.
It should be noted, the scope of duty ratio adjustment has certain limit, when half-power point is departed from when far away in the working point, the indicated projection of arrow can rise higherly among Fig. 9, form big spike, can cause larger interference, from calculating and experimentally, can being adjusted the performance ratio preferably in the adjusting range of 50%-30%.
In the present invention, in fact two-stage modulator order (order of clock modulator and data modulator) can be changed, driver also can be changed, but all can put the adjustment that realizes exporting the light return-to-zero code duty ratio by adjusting the time modulator offset operation, its principle, structure and method of work and the above are basic identical, repeat no more herein.
Claims (8)
1. EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method, in the light return-to-zero code electrooptic modulation that adopts cascaded modulator, described cascaded modulator comprises a clock modulator and a data modulator, it is characterized in that: by adjusting the wherein offset operation point of clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths, thereby obtain the light return-to-zero code of corresponding duty ratio.
2. EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method according to claim 1 is characterized in that: in the light return-to-zero code electrooptic modulation of described cascaded modulator, adjust its offset operation point by the voltage on the bias electrode of adjusting the clock modulator.
3. EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method according to claim 2, it is characterized in that: described clock modulator receives outside adjustment signal by the working point adjusting module, after this adjusts the central control unit processing of signal in the adjusting module of described working point, by digital-to-analogue conversion, suitable bias voltage is delivered on the bias electrode of clock modulator.
4. EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method according to claim 3, it is characterized in that: have duty ratio and bias voltage relation table in the adjusting module of described working point, after communication interface passes to central control unit with the duty ratio numerical value that requires, central control unit is by this table of inquiry, and the driving digital-to-analogue conversion is exported corresponding bias voltage and delivered to the clock modulator.
5. EDM Generator of Adjustable Duty Ratio high-speed light NRZ production method according to claim 4, it is characterized in that: described duty ratio and bias voltage relation table are to drive digital-to-analogue conversion by central control unit by the increasing or decreasing mode, in the enterprising line scanning of all probable values of bias voltage, measure each operating voltage numerical value correspondence light return-to-zero code duty ratio and obtain.
6. EDM Generator of Adjustable Duty Ratio high-speed light NRZ generation device of realizing the described light return-to-zero code production method of claim 1, the clock modulator and the data modulator that comprise cascade, and corresponding clock driver and data driver, bias point generation module with data modulator, it is characterized in that: the working point adjusting module that also comprises the clock modulator, this working point adjusting module is by central control unit, communication interface and D/A converter module are formed, wherein, communication interface receives outside adjustment signal, this adjusts signal after central control unit is handled, carry bias voltage by D/A converter module to the clock modulator, make the pulse train of clock modulators modulate output distinct pulse widths, thereby obtain the light return-to-zero code of corresponding duty ratio at output.
7. the EDM Generator of Adjustable Duty Ratio high-speed light NRZ generation device of stating according to claim 6 is characterized in that: be provided with duty ratio and bias voltage relation table in the adjusting module of described working point.
8. the EDM Generator of Adjustable Duty Ratio high-speed light NRZ generation device of stating according to claim 6 is characterized in that: the bias point generation module of described data modulator receives the feedback of output light, control data modulator offset operation point by optical splitter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031100384A CN1316763C (en) | 2003-04-09 | 2003-04-09 | Duty ratio adjustable high-speed optical return-to-zero code generation method and its equipment |
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| CNB031100384A CN1316763C (en) | 2003-04-09 | 2003-04-09 | Duty ratio adjustable high-speed optical return-to-zero code generation method and its equipment |
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| CN1536785A CN1536785A (en) | 2004-10-13 |
| CN1316763C true CN1316763C (en) | 2007-05-16 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072070B (en) * | 2007-03-19 | 2010-11-03 | 中国科学院西安光学精密机械研究所 | Method for generating low duty ratio optical data packet signal |
| 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 |
| CN102638307B (en) * | 2012-05-09 | 2014-12-03 | 北京理工大学 | High-speed optical return-to-zero code duty cycle measuring method and device thereof |
| CN102916682B (en) * | 2012-10-31 | 2015-07-15 | 电子科技大学 | Pulse width-adjustable NRZ/ R1 (non-return-to-zero/ return-to-1) code converting device |
| KR102390958B1 (en) * | 2015-06-22 | 2022-04-27 | 삼성디스플레이 주식회사 | Display device and method for driving the same |
| CN106209252B (en) * | 2016-05-27 | 2018-08-24 | 西安电子科技大学 | Cascade the arbitrary points MZM autobias control method |
| CN106961261A (en) * | 2017-03-30 | 2017-07-18 | 中国电子科技集团公司第二十四研究所 | A kind of Low phase noise adjustable duty cycle signal source of clock |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0946302A (en) * | 1995-07-28 | 1997-02-14 | Oki Electric Ind Co Ltd | Method and device for generating rz optical pulse |
| US5917637A (en) * | 1995-12-26 | 1999-06-29 | Fujitsu Limited | Method of and device for driving optical modulator, and optical communications system |
| EP1168041A2 (en) * | 2000-06-30 | 2002-01-02 | Mitsubishi Denki Kabushiki Kaisha | Optical transmission apparatus and bias voltage control method for the optical modulator |
| CN1352757A (en) * | 1999-05-27 | 2002-06-05 | 西门子公司 | Method and system for generating return-to-zero signals |
| US6542280B2 (en) * | 2001-05-16 | 2003-04-01 | Innovance, Inc. | Return-to-zero optical modulator with configurable pulse width |
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2003
- 2003-04-09 CN CNB031100384A patent/CN1316763C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0946302A (en) * | 1995-07-28 | 1997-02-14 | Oki Electric Ind Co Ltd | Method and device for generating rz optical pulse |
| US5917637A (en) * | 1995-12-26 | 1999-06-29 | Fujitsu Limited | Method of and device for driving optical modulator, and optical communications system |
| CN1352757A (en) * | 1999-05-27 | 2002-06-05 | 西门子公司 | Method and system for generating return-to-zero signals |
| EP1168041A2 (en) * | 2000-06-30 | 2002-01-02 | Mitsubishi Denki Kabushiki Kaisha | Optical transmission apparatus and bias voltage control method for the optical modulator |
| US6542280B2 (en) * | 2001-05-16 | 2003-04-01 | Innovance, Inc. | Return-to-zero optical modulator with configurable pulse width |
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| CN1536785A (en) | 2004-10-13 |
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