CN101465515B - Debugging apparatus and method based on chirp management laser - Google Patents
Debugging apparatus and method based on chirp management laser Download PDFInfo
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- CN101465515B CN101465515B CN2008102419565A CN200810241956A CN101465515B CN 101465515 B CN101465515 B CN 101465515B CN 2008102419565 A CN2008102419565 A CN 2008102419565A CN 200810241956 A CN200810241956 A CN 200810241956A CN 101465515 B CN101465515 B CN 101465515B
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Abstract
The invention discloses a debugging device and a method based on a chirped management laser; the method comprises the following steps: modulation signals produced by an optical domain are converted into electric-domain signals for modulating the laser; the received command signals are converted into simulating control signals for controlling the working state of the laser, and bias current of the laser, tube core temperature and radio-frequency voltage of AC coupling are set according to the simulating control signals; by comparison, if extinction ratio is not in the required range or is not in accordance with the presetting standard of an eye pattern, the temperature of a spectrum shaping element is adjusted. Compared with the prior art by repeatedly debugging according to the loss of the filter, the steps of the method is less, the debugging procedure is obviously simplified, thus improving the debugging efficiency; the debugging device only adopts a radio-frequency voltage amplitude control unit, a temperature control, a bias current control unit and a laser tube core temperature control unit for carrying out debugging, thus simplifying debugging procedure and improving the debugging efficiency.
Description
Technical field
The present invention relates to intensive light wave multiplex technique, in particular a kind of debugging apparatus and method based on chirp management laser.
Background technology
Laser comprise direct modulated laser (directly modulated laser, DML) and Electroabsorption Modulated Laser (Electro-Absorption Modulated Laser, EML).The rectangular window that in existing 10Gb/sDML laser, has adopted chirp management (Chirp Managed) technology to make, constituted chirp management laser (Chirp Managed Laser, CML).The rectangular window that uses in the CML laser is actually a kind of light spectrum reshaping element (Optical Spectrum Reshaper, OSR), the emission spectrum that is used for laser is directly modulated back output is handled, and filtering wherein is unfavorable for warble (chirp) that transmit.Because as distributed feed-back (Distributed Feed Back, laser entered saturated luminance when DFB) laser injected big bias current, after adding direct modulated current, laser adiabatic chirp (Adiabatic Chirp) makes " 1 " sign indicating number of its light signal of exporting different with the frequency of " 0 " sign indicating number, generally the frequency of " 1 " sign indicating number is higher, sees Fig. 1.
Above-mentioned light spectrum reshaping element designs at the Adiabatic Chirp of directly modulated lasers specially, and this light spectrum reshaping element has certain absorption characteristic to spectral energy, and its absorption curve has certain periodicity and has suitable envelope of curve.By adjusting the die temperature of distributed feed-back Distributed Feedback Laser, can make the spectrum of " 1 " sign indicating number and " 0 " sign indicating number in OSR absorption curve envelope, reach suitable position; If " 1 " sign indicating number just in time is near the envelope curve peak value of OSR, and the spectrum of " 0 " sign indicating number is in outside the envelope curve of OSR, then " 0 " sign indicating number spectral energy is absorbed and " 1 " sign indicating number spectral energy passes through, and the absorption curve of OSR is shown in the dotted line among Fig. 2, and signal message keeps sees Fig. 3.Need to prove that when the envelope peak of OSR absorption curve was on the 50GHz wavelength channel of ITU definition, then this filter was suitable for the application of 50GHz spacing wave subsystem fully, Filter Structures as shown in Figure 4.In addition, light modulating signal " 1 " sign indicating number and the position of " 0 " sign indicating number in the OSR envelope curve are most important, and the ad-hoc location of long wavelength's trailing edge that spectrum need be locked onto absorption curve is to obtain optimum performance.
The output spectrum of CML is locked in the suitable position of OSR absorption curve, can be realized by the variation that two photodiodes (PD pipe) detects luminous power.Wherein first photodiode (PD1) is used for detecting the watt level of Distributed Feedback Laser output light, second photodiode (PD2) is used for detecting the watt level of the light that reflects from OSR, comprised the information of OSR absorption curve in the detected light signal of second photodiode with respect to the emission spectrum position, work as like this under the constant situation of Distributed Feedback Laser Output optical power, the detected optical power change of second photodiode has then illustrated the change of this position relation, when emission spectrum reaches correct position, the detected luminous power size of second photodiode is determined with the ratio of the detected luminous power size of first photodiode, as long as can guarantee that these two luminous powers than value stabilization, have promptly realized the spectrum locking.As previously mentioned, if when the envelope peak of OSR absorption curve is on the 50GHz wavelength channel of ITU definition, then wavelength locking realizes simultaneously.The CML laser can produce following advantage according to the working point difference: based on the optimization of dispersion tolerance: but no chromatic dispersion compensation condition down transmission range can reach 200km, this transmission performance is that present Electroabsorption Modulated Laser (EML) is incomparable.Optimization based on light signal signal to noise ratio (OSNR): if, can accomplish that light signal signal to noise ratio (OSNR) tolerance limit of B-B reaches 9dB with (RZ) modulation of making zero.
Because the CML laser has better chromatic dispersion tolerance and OSNR performance than existing DML laser, EML laser, more farther than the transmission range of general 10G EML laser, spectral width is narrower, and its market demand increases day by day.But, because this laser is in-built special, the parameters such as relative latched position of the bias current of laser, modulated current, centre wavelength, OSR all intercouple to the chromatic dispersion and the OSNR performance of laser, during debugging, at first, need build the light path system of test OSNR or chromatic dispersion, the OSNR performance of test b-B, perhaps the passage cost is assessed the dispersion penalty of whole optical path system.Then, also need to determine the relative latched position of centre wavelength and OSR according to filter loss (Filter Loss), the filter loss is meant when laser does not add modulation, output work rate variance when the power output when centre wavelength is locked in the central point of OSR locks onto best lock point when adding modulation signal, choose the working point an of the best to reach best transmission performance ratio in the information of warbling that this stage need utilize spectrometer to observe in the spectrum, debugging complexity and debugging efficiency are very low, inapplicable production in enormous quantities.
Therefore, also there is defective in prior art, awaits improving and development.
Summary of the invention
The technical problem that the present invention solves provides a kind of debugging apparatus and method based on chirp management laser, can simplify debugging routine by this method and apparatus and improve debugging efficiency.
For solving the problems of the technologies described above, the present invention adopts following scheme:
A kind of debugging apparatus based on chirp management laser, it comprises:
Radio-frequency voltage amplitude control unit is used to set the radio-frequency voltage of AC coupled;
Temperature control unit is used to set the particular location of the wavelength of light spectrum reshaping element absorption at spectrum;
The bias current control unit is used for the size of setting laser device bias current;
The laser tube core temperature control unit is used for the particular location of the wavelength of setting laser device at spectrum;
Test cell, described test cell comprise ophthalmograp and Optical Signal To Noise Ratio or chromatic dispersion test unit, and described ophthalmograp is used for generating and shows eye pattern, and are used to test extinction ratio and eye pattern and whether satisfy that template requires or whether the eye pattern that shows exists two-wire.
Described device, wherein, described test cell also comprises: Optical Signal To Noise Ratio or chromatic dispersion test unit are used to optimize Optical Signal To Noise Ratio or chromatic dispersion.
Described device wherein, also comprises the signal generating unit that is connected with chirp management laser, is used for producing to chirp management laser output rf modulated signal.
Described device, wherein, signal generating unit comprises: SDH analyzer is used for producing modulation signal on the light territory; Be arranged on the receiving terminal between this SDH analyzer and the chirp management laser, light territory conversion of signals is become electric territory signal.
The present invention also provides a kind of adjustment method based on chirp management laser, may further comprise the steps:
S1, the modulation signal that produces on the light territory is converted to the electric territory signal that is used for laser modulation;
S2, the control command that receives is converted to the analog control signal of control laser works state, and according to the radio-frequency voltage of the bias current of described analog control signal setting laser device, die temperature, AC coupled;
S3, through relatively, if extinction ratio not in claimed range or do not meet the preset standard of eye pattern, is then adjusted the temperature of light spectrum reshaping element.
Described method, wherein, described step S3 also comprises: if conformance with standard then test light signal-to-noise performance or dispersion penalty, the temperature of finely tuning described light spectrum reshaping element is until meeting parameter preset.
Described method, wherein, described step S3 comprises: the preset standard of described eye pattern is that the eye pattern that ophthalmograp shows does not exist two-wire.
Debug repeatedly by filter loss with prior art and to compare, the step of adjustment method that the present invention is based on chirp management laser is less, obviously simplifies debugging routine, thereby has improved debugging efficiency; The debugging apparatus that the present invention is based on chirp management laser has only adopted radio-frequency voltage amplitude control unit, temperature control unit, bias current control unit, laser tube core temperature control unit just can finish debugging, simplifies debugging routine and has improved debugging efficiency.
Description of drawings
Fig. 1 is the curve chart of laser prechirp in the prior art;
Fig. 2 is the absorption curve figure of light spectrum reshaping in the prior art;
Fig. 3 be in the prior art behind the light spectrum reshaping signal message keep curve chart;
Fig. 4 is the structure of prior art median filter;
Fig. 5 is based on the debugging apparatus structured flowchart of chirp management laser among the present invention;
Fig. 6 is based on the adjustment method flow chart of chirp management laser among the present invention.
Embodiment
This method is a kind of at intensive multiplexed optical wave (Dense Wavelength Division Multiplexing, DWDM) in the system, determine fast and accurately based on the optimum light signal signal to noise ratio (OSNR) of the transmitter of CML laser or the adjustment method of chromatic dispersion.
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
See Fig. 5, the debugging apparatus based on chirp management laser of the present invention comprises: the laser parameter control unit 100 that is connected with the CML laser, signal phonation unit 200 and test cell 300 respectively.
Laser parameter control unit 100 is used for the adapter unit of control command and laser, and the order that issues is changed into the operating state that corresponding analog control signal is controlled laser.Laser parameter control unit 100 comprises: radio-frequency voltage amplitude control unit 110, temperature control unit 120, bias current control unit 130, laser tube core temperature control unit 140.
Radio-frequency voltage amplitude control unit 110 is used to set the radio-frequency voltage of AC coupled, promptly is ac-coupled to laser High Speed Modulation voltage; Temperature control unit 120 is used to set the particular location of light spectrum reshaping element at spectrum; Bias current control unit 130 is used for the size of setting laser device bias current; Laser tube core temperature control unit 140 is used for the particular location of the wavelength of setting laser device at spectrum.
Whether test cell 300 is used to test modulation parameter and meets the demands.Test cell 300 comprises: ophthalmograp 310, Optical Signal To Noise Ratio or chromatic dispersion test unit 320.Ophthalmograp 310 is used to test extinction ratio and whether eye pattern satisfies the template requirement, and Optical Signal To Noise Ratio or chromatic dispersion test unit 320 are selectable units, use when being used for further optimizing Optical Signal To Noise Ratio or chromatic dispersion.
The flow process of this modular debugging method:
At first, utilize bias current control unit 130 that laser bias current is set at 80mA; Utilize laser tube core temperature control unit 140 with the wavelength set of laser on the grid of ITU-T, i.e. the particular location of spectrum; The radio-frequency voltage of setting AC coupled is set at 2.2V, the correspondence 10GHz that warbles; The temperature of adjusting the light spectrum reshaping element makes extinction ratio (ER) at 12-13dB;
Then, apply mechanically eye pattern mask, if there is not the eye pattern mask of RZ, available ophthalmograp is observed the RZ eye pattern and whether is had two-wire; The test light signal-to-noise performance, the temperature of fine setting light spectrum reshaping element is to reach optimum, and this step is omissible when producing debugging.
This invention can be used at producing in enormous quantities, for example is applied in the wavelength-division optical transmission system of extra long distance and long span Optical Signal To Noise Ratio (OSNR) performance demands is achieved the desired result through test; Debug repeatedly by filter loss with prior art and to compare, the step of adjustment method that the present invention is based on chirp management laser is less, obviously simplifies debugging routine, thereby has improved debugging efficiency; The debugging apparatus that the present invention is based on chirp management laser has only adopted radio-frequency voltage amplitude control unit, temperature control unit, bias current control unit, laser tube core temperature control unit just can finish debugging, simplifies debugging routine and has improved debugging efficiency; In addition, of the present invention simple in structure, implement in actual applications simply, have actual application value, be a kind of very economical debugging apparatus.
The present invention also provides a kind of adjustment method based on chirp management laser,
At first, the modulation signal that produces on the light territory is converted to the electric territory signal that is used for laser modulation;
Then, the command signal that receives is converted to the analog control signal of controlling the laser works state, and carries out the following steps (see figure 6) according to described analog control signal:
10, the bias current of setting laser device;
20, setting laser organ pipe core temperature;
30, set radio frequency (RF) voltage that exchanges (AC) coupling;
40, adjust the temperature of light spectrum reshaping element (OSR), make extinction ratio in claimed range; Be that extinction ratio (ER) is greater than desired value.
50, observe eye pattern, if the standard of not meeting then the temperature of adjusting light modulation spectrum shaping element are until conformance with standard; If conformance with standard, then execution in step 60; When carrying out this step,, then adopt ophthalmograp to observe described eye pattern and whether have two-wire, exist two-wire then to show the standard of not meeting, need the temperature of fine setting light spectrum reshaping element to disappear until described two-wire disappearance until described two-wire if there is not eye pattern mask to apply mechanically.
60, test light signal-to-noise performance or dispersion penalty, the temperature of finely tuning described light spectrum reshaping element is until meeting parameter preset; For example, B-B can reach 16.5dB when the OSNR optimum was meant no FEC, the little and 2dB of no chromatic dispersion compensation of dispersion cost behind the transmission 200KM when chromatic dispersion optimum is meant no FEC.
70, preserve above laser parameter.
Should be understood that; the above embodiment that provides is just to explanation of the present invention; and not should be understood to limitation of the present invention; to those skilled in the art; can be improved according to the above description or conversion; and all these improve and conversion all should be disclosed principle and feature, all belong to protection scope of the present invention.
Claims (7)
1. the debugging apparatus based on chirp management laser is characterized in that, comprising:
Radio-frequency voltage amplitude control unit is used to set the radio-frequency voltage of AC coupled;
Temperature control unit is used to set the particular location of the wavelength of light spectrum reshaping element absorption at spectrum;
The bias current control unit is used for the size of setting laser device bias current;
The laser tube core temperature control unit is used for the particular location of the wavelength of setting laser device at spectrum;
Test cell, described test cell comprise ophthalmograp and Optical Signal To Noise Ratio or chromatic dispersion test unit, and described ophthalmograp is used for generating and shows eye pattern, and are used to test extinction ratio and eye pattern and whether satisfy that template requires or whether the eye pattern that shows exists two-wire.
2. device according to claim 1 is characterized in that, described test cell also comprises: Optical Signal To Noise Ratio or chromatic dispersion test unit are used to optimize Optical Signal To Noise Ratio or chromatic dispersion.
3. device according to claim 1 is characterized in that, also comprises the signal generating unit that is connected with chirp management laser, is used for producing to chirp management laser output rf modulated signal.
4. device according to claim 3 is characterized in that signal generating unit comprises: SDH analyzer is used for producing modulation signal on the light territory; Be arranged on the receiving terminal between this SDH analyzer and the chirp management laser, light territory conversion of signals is become electric territory signal.
5. adjustment method based on chirp management laser may further comprise the steps:
S1, the modulation signal that produces on the light territory is converted to the electric territory signal that is used for laser modulation;
S2, the control command that receives is converted to the analog control signal of control laser works state, and according to the radio-frequency voltage of the bias current of described analog control signal setting laser device, die temperature, AC coupled;
S3, through relatively, if extinction ratio not in claimed range or do not meet the preset standard of eye pattern, is then adjusted the temperature of light spectrum reshaping element.
6. method according to claim 5 is characterized in that, described step S3 also comprises: if conformance with standard then test light signal-to-noise performance or dispersion penalty, the temperature of finely tuning described light spectrum reshaping element is until meeting parameter preset.
7. according to claim 5 or 6 described methods, it is characterized in that described step S3 comprises: the preset standard of described eye pattern is that the eye pattern that ophthalmograp shows does not exist two-wire.
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| CN2008102419565A CN101465515B (en) | 2008-12-26 | 2008-12-26 | Debugging apparatus and method based on chirp management laser |
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| CN2008102419565A CN101465515B (en) | 2008-12-26 | 2008-12-26 | Debugging apparatus and method based on chirp management laser |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102347584B (en) * | 2011-06-29 | 2012-10-31 | 索尔思光电（成都）有限公司 | Method for stabilizing light eye diagram output by EML (equal matrix language) TOSA (transmitter optical subassembly) |
| CN102752676B (en) * | 2012-07-12 | 2015-09-30 | 青岛海信宽带多媒体技术有限公司 | EPON and optical module for optical network unit thereof |
| WO2015006902A1 (en) * | 2013-07-15 | 2015-01-22 | 华为技术有限公司 | Wavelength alignment method and device, and optical network system |
| CN104919665B (en) | 2013-08-15 | 2018-12-14 | 华为技术有限公司 | A kind of laser, laser modulation method and laser composite wave system |
| CN105450309B (en) * | 2015-11-11 | 2018-02-16 | 烽火通信科技股份有限公司 | High speed signal frequency equilibrium and chirp management method based on single optical filter |
| CN111865426B (en) * | 2020-07-20 | 2022-04-12 | 成都优博创通信技术有限公司 | Spectrum alignment method and device, transmitter and optical network system |
| CN111865427B (en) * | 2020-07-20 | 2022-03-11 | 成都优博创通信技术有限公司 | Wavelength alignment method, device, transmitter and optical network system |
| CN114978319A (en) * | 2021-02-19 | 2022-08-30 | 南京中兴软件有限责任公司 | Signal processing method, network device, and storage medium |
| CN113418682B (en) * | 2021-08-23 | 2021-12-07 | 西安奇芯光电科技有限公司 | Laser chirp performance testing device and method |
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