CN100568780C - Tunable straight light modulation sending module and calibration and control method - Google Patents
Tunable straight light modulation sending module and calibration and control method Download PDFInfo
- Publication number
- CN100568780C CN100568780C CN 200510102639 CN200510102639A CN100568780C CN 100568780 C CN100568780 C CN 100568780C CN 200510102639 CN200510102639 CN 200510102639 CN 200510102639 A CN200510102639 A CN 200510102639A CN 100568780 C CN100568780 C CN 100568780C
- Authority
- CN
- China
- Prior art keywords
- laser
- micro
- wavelength
- control unit
- potentiometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The present invention relates to a kind of tunable straight light modulation sending module and calibration and control method, comprise tunable directly modulated lasers, direct modulation control circuit, automatic optical power control circuit, automatic temperature-adjusting control circuit and laser shutdown control and performance monitoring circuit, realize digital module parameter calibration, online adjustment and performance parameter diagnosis by introducing micro-control unit and non-volatile digital regulation resistance.Production phase, to module channels calibration, with each non-volatile digital regulation resistance value storage of each wavelength channel of adjusting in the micro-control cell memory; Application stage, according to selected wavelength channel, from the micro-control cell memory, take out each non-volatile digital regulation resistance numerical value of target wavelength correspondence, write each digital regulation resistance respectively, realize the online adjustment of optical transmission module wavelength channel.Simultaneously, described module can provide performance parameter to detect, and testing result is converted to digital signal reports and alarm.
Description
Technical field
The present invention relates to digital fiber transmission system technical field, specifically, relate to a kind of tunable straight light modulation sending module and calibration and control method.
Background technology
Along with the continuous development of optical communication technique, light emission module and Optical Receivers are applied in the optical transmission system more and more widely, play a part electricity/light, light/electricity conversion, and its performance has material impact to the optical transmission system index.Telecommunication apparatus is sent high-speed electrical signals into optical transmission module after treatment, and optical transmission module passes through modulators modulate to the light signal of laser output with the signal of telecommunication again, just can realize the transmission of signal in the light territory.In, the general employing of long haul optical transmission systems have refrigeration directly modulated lasers, the operation wavelength of laser will satisfy the ITU-TG.692 regulation to be applicable to that the smallest passage of optical fiber G.652/G.655 is spaced apart the specific wavelength requirement of 100GHz.
Optical transmission module has four functional circuits usually: laser automatic power control circuitry (APC), be used for the stable laser Output optical power, and the relevant monitor value of bias current size with laser Output optical power and laser is provided; The direct modulation control circuit of laser (DMC), the signal of telecommunication (comprising differential data signals and differential clock signal) of input optical transmission module is modulated on the light signal of laser output after treatment, realize the conversion of the signal of telecommunication to light signal, the extinction ratio index of control laser output light signal is stable; Laser automatic temperature-adjusting control circuit (ATC), be used for the stable laser die temperature, has the relation of determining between laser tube core temperature and the laser output wavelength, thereby reach the purpose of light stable wavelength, and this circuit also needs to provide laser tube core temperature monitoring value and die temperature Threshold Crossing Alert signal; With laser shutdown control and performance monitoring circuit.
The theory diagram of optical transmission module as shown in Figure 1, the optical transmission module parameter adjustment can use simulation potentiometer, digital/analog converter (DAC) or digital potentiometer to finish, for example in the APC circuit, utilize potentiometer RA1 to adjust the laser transmitting optical power, in the DMC circuit, utilize potentiometer RA2 to adjust the extinction ratio of light signal, in the ATC circuit, utilize potentiometer RA3 to adjust the optical wavelength of laser.If utilize DAC or digital potentiometer to realize the adjustment of module performance parameter, then DAC or digital potentiometer are externally by the serial line interface communication, as shown in phantom in Figure 1.
Among four functional circuits of optical transmission module, negative tempperature coefficient thermistor RT that ATC circuit and laser are inner integrated and TEC semiconductor cooler form a feedback control loop, realize that High Accuracy Control has the function of cooling laser die temperature.As shown in Figure 2, for straight distributed Feedback (DFB) the laser intraware schematic diagram of transferring of refrigeration is arranged, its intraware comprises laser diode (LD), power monitoring PIN junction photodiode (PIN pipe), thermistor TH and TEC semiconductor cooler dorsad.The output wavelength of fixed wave length Distributed Feedback Laser is influenced by die temperature and the operating current that flows through laser tube core mainly, wherein die temperature has decisive influence to wavelength, the laser works electric current is less relatively to wavelength affects, therefore has cooling laser mainly to realize controlling the purpose of output wavelength by control laser tube core temperature.
It is under the condition of Iop that Fig. 3 has provided the laser works electric current, typical relation curve between die temperature and the laser output wavelength, wavelength/the temperature coefficient that can obtain laser according to this wavelength-temperature relation curve is approximately 0.1nm/ ℃, the parameter that is combined with cooling laser can design cooling laser automatic temperature control circuit (ATC), makes the output wavelength of laser satisfy system requirements.For dense wave division multipurpose (DWDM) system, require the operation wavelength of laser to be stabilized in the ITU-TG.692 regulation and be applicable to that G.652/G.655 the channel spacing of optical fiber is on the specific wavelength of 100GHz.The tradition optical transmission module is generally operational on the fixed wave length, and promptly the die temperature of laser will be set on the temperature spot corresponding with this wavelength, and die temperature does not change with the operating ambient temperature of laser.Require the skew that ends of operation wavelength life-span of laser to be less than ± 20GHz in wavelength division multiplexing (WDM) optical transmission system, temperature drift is less than ± 4GHz.The operation wavelength of optical transmission module in the certain environment temperature range and the module life requirement of at the end whether satisfying system applies depend on the performance of the direct modulated laser of selecting for use, the operating efficiency of for example size of the range of set value of laser tube core temperature, and laser refrigerator TEC and the design of laser internal heat dissipating etc.The die temperature scope of conventional laser is 25 ℃～30 ℃, and after the set point of die temperature exceeds above-mentioned scope, laser will be difficult to guarantee that operation wavelength is stable in-15 ℃～65 ℃ ambient temperature.G.692, the corresponding 0.8nm wavelength channel of the 100GHz frequency interval that ITU-T defines at interval, therefore the die temperature of laser differs 8 ℃ on the adjacent wave long-channel, so traditional in actual use optical transmission module can only be operated on the fixing wavelength, do not have tunable function, promptly can not be operated on a plurality of wavelength channels.
Along with individual laser package technology and TEC semiconductor cooler continuous advancement in technology, laser manufacturer has released have a bigger die temperature setting range tunable gradually refrigeration directly modulated lasers product, make conventional laser be operated on a plurality of wavelength channels and become possibility, this tunable laser is compared with general laser assembly does not have structural difference, and its structure chart is referring to Fig. 2.By adopting advanced thermal design that the die temperature of laser is set in the bigger scope, as 8 ℃～50 ℃, the output wavelength of laser just can be set on any ITU-T wavelength channel that satisfies the said temperature scope like this.
Although traditional optical transmission module is succinct because of its project organization, technology maturation has been that institute of telecommunication apparatus manufacturer generally adopts.But, the disadvantage that the tradition optical transmission module exists is, though adopt the optical transmission module of traditional structure module to be operated on a certain wavelength of a plurality of passages by setting potentiometer, can be in case determine in the production phase operation wavelength, conventional module just can not realize the online adjustment of operation wavelength, promptly can not well realize the function that static or accurate dynamic wavelength is set according to the needs of system configuration, particularly after dynamically reconfigurable network system occurs, the online tunable techniques of optical transmission module is one of the core of this system and key technology.
In sum, adopt the optical transmission module of traditional structure to use tradition to have the refrigeration directly modulated lasers can not realize online tunable function.Along with the development of optical communication technology, new laser technique occurs, but the optical transmission module of traditional structure can not satisfy the static application of network system and the requirement of accurate dynamic reconfigurable application.Therefore, need a kind of new optical transmission module structural design, to realize the online tuber function of wavelength.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of tunable straight light modulation sending module and calibration and control method, makes module can be operated in a plurality of wavelength channels, realizes that wavelength channel is online tuning.
The invention provides a kind of tunable straight light modulation sending module, comprising:
Laser is used to realize electricity/light signal conversion;
Automatic optical power control circuit comprises first potentiometer (RA1), is used to adjust the laser transmitting optical power; Also comprise luminous power testing circuit dorsad, exporting dorsad by an amplifier, luminous power detects voltage;
Directly modulation control circuit comprises second potentiometer (RA2), is used to adjust the extinction ratio of laser;
The automatic temperature-adjusting control circuit comprises the 3rd potentiometer (RA3), is used to adjust the die temperature of laser;
Laser shutdown control and performance monitoring circuit are used to control the shutoff and the performance monitoring of laser;
It is characterized in that,
Described first, second, third potentiometer is non-volatile digital regulation resistance;
The described testing circuit of luminous power dorsad comprises one the 4th potentiometer (RA4), is non-volatile digital regulation resistance, is connected between described amplifier's inverting input and the output, is used to adjust the amplification coefficient of luminous power testing circuit dorsad;
Described laser shutdown control and performance monitoring circuit comprise a micro-control unit, are used for shutoff and performance monitoring by this micro-control unit controls laser;
Wherein, described micro-control unit links to each other with described first, second, third, fourth potentiometer, and the numerical value adjustment of each potentiometer is controlled;
Described micro-control unit also comprises a memory, is used for storage laser tunable wavelength information, and the numerical value of described each potentiometer corresponding with each wavelength information.
Described laser is tunable directly modulated lasers.
Described micro-control unit and described first, second, third, fourth potentiometer link to each other by inner IIC interface.
Described micro-control unit has the multi-channel analog digital conversion circuit, is used for the detection module performance index, detected value is deposited in the micro-control cell memory, and produced alarm signal according to the comparison with normal index.
Described micro-control unit is by exterior I IC interface and extraneous communication.
The invention provides and a kind of described tunable straight light modulation sending module is carried out the method for wavelength scaling, comprise the steps:
(A) host computer writes selected laser tunable wavelength information in the memory of described micro-control unit;
(B) adjust the numerical value of described each potentiometer by the micro-control unit controls, described each potentiometer converts the numerical value of adjusting to laser Output optical power analog regulation signal, laser extinction ratio analog regulation signal, laser output wavelength tunnels analogy conditioning signal and laser luminous power detection adjustment analog regulation signal dorsad, detect luminous power, extinction ratio, operation wavelength and the Output optical power detection signal of optical module output by extension instrument, until these module performance parameters till the current selected wavelength is issued to system requirements;
(C) numerical value that will work as above-mentioned module performance parameter each potentiometer when the current selected wavelength is issued to system requirements writes in the memory of described micro-control unit, and corresponding with the current selected wavelength of wherein storage.
(D) the fixed next wavelength of alternative repeats described step (A), (B), (C).
Described step (A) is wavelength information to be write in the memory of micro-control unit via exterior I IC interface by host computer.
Described step (B) is to control each potentiometer by inner IIC interface to adjust.
The present invention also provides a kind of method that described tunable straight light modulation sending module is carried out online adjusting, comprises the steps:
(1) the micro-control unit obtains the target operation wavelength that need be adjusted to;
(2) close laser by the micro-control unit;
(3) numerical value of described each potentiometer corresponding with it is inquired about according to the target operation wavelength that is obtained in the micro-control unit in memory;
(4) numerical value of current each potentiometer is adjusted according to the numerical value of each potentiometer of being stored in the micro-control unit;
(5) open laser by the micro-control unit.
The method of described online adjustment, in the described step (4), the micro-control unit also is updated to the target operation wavelength with the work at present wavelength information of storing in the micro-control cell memory.
Described step (1) is to pass through exterior I IC interface by the extranets guard system, obtains from the memory of described micro-control unit and can supply tuning operation wavelength information, and after therefrom choosing the target operation wavelength that need be adjusted to, send to described micro-control unit.
Described step (4) be by the micro-control unit by inner IIC interface, the value of each potentiometer of writing down in the memory is write in each potentiometer.
Tunable straight light modulation sending module of the present invention and calibration and control method, compare with traditional optical transmission module, mainly be that control mode has been done bigger improvement, make that by introducing micro-control unit (MCU) and non-volatile digital regulation resistance the control mode of optical transmission module is succinct more flexibly, the various performances of module can detect in real time by the micro-control unit, and report by the unification of external IIC interface, the eeprom memory of MCU is used for the parameter information of memory module, can realize the read-write of EEPROM parameter information by defining Management Information Base, the most important thing is that described module makes the tuning possibility that becomes of online passage.Selecting for use of non-volatile digital regulation resistance further improved the functional reliability of module.
The advantage that the present invention's this module digitlization diagnosis and Digital Control are brought is more outstanding, mainly comprises:
(1) for fear of of the influence of MCU job insecurity, uses non-volatile digital regulation resistance to solve the MCU abnormal work and cause problem the module misoperation to module.Make the stability of this module considerably beyond the optical transmission module that uses the traditional analog potentiometer;
(2) by being connected to form automatic debug platform with test instrumentation, the production of this module can break away from manual intervention fully, realizes automatic production line, enhances productivity greatly, reduces cost;
(3) performance of module detects more quick and precisely, compares with traditional optical transmission module, and the digital quantity after will changing by the IIC interface reports host computer, has reduced environment to the influence that the modularity energy detects, and has improved reliability;
(4) by the definition command interface, MCU once reports the various performances in the module by the IIC interface, realize the quick complete detection of webmaster, compare that new tunable optical sending module operating efficiency greatly improves with traditional optical transmission module to the module operating state;
(5) the most important thing is to realize setting fast automatically of module operating state, for example webmaster can change the service aisle of tunable optical sending module online, fast in the dynamically reconfigurable network system of standard, for the switching of optical wavelength passage in the realization system provides technical assurance.
Description of drawings
Fig. 1 is the theory diagram of traditional optical transmission module;
Fig. 2 has cooling laser intraware schematic diagram;
Fig. 3 is the output light wavelength of wavelength specific laser and the graph of a relation of die temperature
Fig. 4 is the theory diagram of the sending module of tunable optical described in the embodiment of the invention;
Fig. 5 is the schematic diagram of luminous power testing circuit dorsad described in the embodiment of the invention;
Fig. 6 is the working method schematic diagram of the unit of micro-control described in the embodiment of the invention in module;
Fig. 7 is the module calibration flow chart that utilizes described calibrating method to carry out in the embodiment of the invention;
Fig. 8 is that the module of utilizing described control method to carry out in the embodiment of the invention is regulated flow chart.
Embodiment
The theory diagram of tunable optical sending module of the present invention is referring to Fig. 4, described module is used tunable directly modulated lasers, have automatic optical power control circuit and adjust output average power with stable laser, have extinction ratio that direct modulation circuit adjusts laser and provide stable modulation signal for laser, have automatic temperature-controlled circuit and be used to adjust laser output wavelength and stable laser die temperature, thus the stable laser output wavelength.
Compare with traditional optical transmission module, characteristics of the present invention are to use non-volatile digital regulation resistance to come every performance of adjusting module; Use micro-control unit MCU to realize that the shutoff control and the performance of laser detect automatically; Eeprom memory among the use micro-control unit MCU is stored the basic parameter of optical transmission module, as laser output power, operating rate and tunable wavelength table etc., also stores the information and the detected performance that inquire in the non-volatile digital regulation resistance; MCU can further handle and produce a series of alarm signals to detection limit, and the pin of the I/O by MCU is drawn; Use inner iic bus communication between MCU and the inner non-volatile digital regulation resistance; Use exterior I IC bus communication between MCU and the extraneous veneer MCU, the basic parameter of module and performance parameter report by exterior I IC bus; Cooperate with digital current potential by MCU and to realize the online passage tuber function of optical transmission module.
Described non-volatile digital regulation resistance has the iic bus interface, and the digital regulation resistance output valve is stored in the digital regulation resistance sheet among the EEPROM, and the characteristic of EEPROM is exactly that the data of the inside after the power down are not lost.Therefore power on after the digital regulation resistance power down, its output can not become, and promptly has non-volatile characteristic again.This potentiometer can be easily and extraneous communication by iic bus, non-volatile digital regulation resistance RA1, RA2, RA3 and RA4 and outer meeting resistance network constitute respectively at Output optical power adjustment, extinction ratio adjustment, laser tube core temperature adjust and dorsad luminous power detect the numeral of adjusting and adjust circuit.
Compare with traditional optical transmission module, the present invention increases and has used a digital regulation resistance RA4 that luminous power testing circuit is dorsad adjusted, because under normal conditions under the laser tube core temperature constant condition dorsad luminous power testing circuit amplification coefficient fix, and the die temperature of tunable laser will be set in the bigger temperature range, the change of laser tube core temperature can cause that luminous power detects the change of the conversion coefficient of electric current dorsad, so need be by the amplification coefficient of conversion of signals amplifying circuit is adjusted to compensate this variation.Digital regulation resistance RA4 is used for the amplification coefficient of the testing circuit of luminous power dorsad under the various lasers die temperature is adjusted, to mate mutually with the actual size of laser Output optical power under the laser tube core temperature that the voltage signal of luminous power testing circuit output is being determined through adjusting back, therefore for different die temperatures, need calibrate the accuracy of detection that the amplification coefficient of luminous power testing circuit dorsad improves the laser Output optical power.The testing circuit of luminous power dorsad that has increased non-volatile digital regulation resistance RA4 as shown in Figure 5, Vpmon is through adjusted luminous power dorsad and detects voltage among the figure.
In order to satisfy module miniaturization, integrated requirement, MCU inside, described micro-control unit comprises 8051 compatible kernels, and interior band multi-channel analog digital conversion circuit (ADC) has IIC, SPI, USART mouth, supply monitor and ADC DMA function.MCU adopts IIC interface and extraneous communication, and veneer MCU can read by the EEPROM space of IIC interface from MCU easily and detect the reporting information of collecting, and also can issue wavelength adjustment instruction by the IIC interface.Between the non-volatile digital regulation resistance in MCU and the module by inner iic bus communication, MCU comes non-volatile digital regulation resistance is read and write according to the order of veneer, thereby realizes Output optical power, extinction ratio, output wavelength and the status monitoring and the adjustment of the amplification coefficient of luminous power testing circuit dorsad to optical transmission module.Inside iic bus in the module and exterior I IC bus are strict to be separated, and avoids the phase mutual interference, and the working method of micro-control unit MCU as shown in Figure 6.Do not have in the optical transmission module directly to use the digital/analog converter (DAC) of MCU and adopt non-volatile digital regulation resistance, be the output that changes DAC for fear of micro-control unit MCU when the abnormal work state, thereby cause the change of optical module operating state, even causing serious consequence, the use of non-volatile current potential device helps improving the job stability of module.
Optical transmission module of the present invention will be realized tunable function, needs the ripe effectively adjustment method of a cover, and its debug process is divided into two parts, and module channels calibration and module channels are regulated.
The module essential information of storing in the eeprom address space of the micro-control unit of tunable optical sending module of the present invention and the generative process of wavelength channel information are referred to as the calibration process of optical transmission module.
Described tunable module essential information comprises initial wavelength, wavelength interval, tunable wavelength number and the module work at present wavelength etc. of module power output, operating rate, modulation system, transmission range, tunable laser.Each tunable laser all has certain continuous wavelength tuning capability, and the ITU-T operation wavelength of definition laser maximum is initial wavelength, according to 0.4nm or 0.8nm wavelength interval and tunable wavelength number, just can obtain the wavelength tuning range of module.Module with two identical initial wavelength, different wave length interval and number of wavelengths is an example, the structure of module tuning wavelength table is as shown in table 1, provided Unified coding CHx in the table 1 at the wavelength channel of ITU-T definition, in module MCU and host computer, adopt this to encode and represent the corresponding wavelength passage.
Table 1
| |
Module 2 initial wavelength 1560.61nm 8X wavelength interval 0.4nm | ITU-T nominal center wavelength X x (nm) |
| CH1* | CH1* | 1560.61 |
| CH2 | 1560.20 | |
| CH3 | CH3 | 1559.79 |
| CH4 | 1559.39 | |
| CH5 | CH5 | 1558.98 |
| CH6 | 1558.58 | |
| CH7 | CH7 | 1558.17 |
| CH8 | 1557.77 |
Annotate the primary wave long codes of * module.
Except the basic parameter and the tabulation of above-mentioned tuning wavelength of module, also write down the numerical value that need write non-volatile digital regulation resistance RA1, RA2, RA3 and RA4 at each wavelength channel among the EEPROM of module, these value storage are at fixing address space.With the module in the table 11 is example, and table 2 provides the data content that writes down among the tunable module EEPROM of a 4X0.8nm wavelength interval.With 8 (256 grades) adjustable digital regulation resistances is example, the numerical value adjustable range of digital regulation resistance is 0～FF, a byte among the EEPROM can be stored the numerical value of digital regulation resistance, therefore will leave in 4 continuation address spaces according to fixing order with digital regulation resistance RA1, RA2, RA3 and RA4 value corresponding, first address is relevant with wavelength channel.
Table 2
| Wavelength-encoding | The EEPROM first address [1] | Corresponding RA1 (luminous power) | Corresponding RA2 (extinction ratio) | Corresponding RA3 (wavelength) | Corresponding RA4 (power detection dorsad) | |
| CH1* | 80H | 18 | 31 | B3 | 15 | |
| CH3 | 84H | 1B | 31 | 95 | 13 | |
| CH5 | 88H | 1E | 31 | 76 | 12 | |
| | 8CH | 20 | 31 | 59 | 10 |
The memory allocation of annotating EEPROM in 1 table only plays the example effect, and the user need be set according to actual conditions.
Annotate the primary wave long codes of * module.
This shows that the data of storing among the EEPROM are most important for the online tunable function that realizes module.
Below in conjunction with calibration process shown in Figure 7, the passage calibrating method of optical transmission module 1 is described:
(701) host computer writes module essential informations such as primary wave long codes CH1, the wavelength interval 0.8nm of module power output, operating rate, modulation system, transmission range, tunable laser, tunable wavelength several 4 appropriate address among the EEPROM of MCU by exterior I IC bus, host computer obtains Wavelength-encoding CH1, the CH3 corresponding with optical transmission module tunable wavelength λ m, λ m+1, λ m+2 and λ m+3 (wavelength interval 0.8nm), CH5 and CH7 tabulation according to above-mentioned information simultaneously.
(702) select module work at present wavelength for needing the wavelength X m of calibration, host computer is assigned wavelength information to MCU by exterior I IC bus interface, MCU adjusts non-volatile digital regulation resistance RA1 respectively by inner iic bus, RA2, the numerical value of RA3 and RA4, digital regulation resistance then converts the numerical value of adjusting to laser Output optical power analog regulation signal, laser extinction ratio analog regulation signal, laser output wavelength tunnels analogy conditioning signal and laser luminous power dorsad detect adjustment analog regulation signal, detect the luminous power of optical module output by extension instrument, extinction ratio, operation wavelength λ m and Output optical power detection signal reach the numerical value of appointment up to these performance index, satisfy till the system requirements.
(703) host computer is assigned the module channels M calibration order of wavelength X m correspondence to MCU by extraneous IIC interface, command parameter is this Wavelength-encoding CH1, CH1 comprises command word and λ m wavelength parameter, MCU with the numerical value of non-volatile digital regulation resistance RA1, RA2, RA3 and RA4 according to fixing sequential storage in EEPROM with Wavelength-encoding CH1 corresponding address space, generate the data among the address 80H～83H shown in the table 2.Simultaneously the work at present Wavelength-encoding of storing among the EEPROM is refreshed and be CH1.
(704) select module work at present wavelength for needing the wavelength X m+1 of calibration, repeating step (702)～(703) generate the data among the address 84H～87H shown in the table 2, finish the calibration of wavelength CH3 related data.Repeat aforesaid operations, up to 4 passage calibrations finishing optical transmission module.Will with the corresponding 4 groups of digital regulation resistance value storage of 4 operation wavelength λ m～λ m+3 of laser fixed address space at EEPROM.Module basic parameter and wavelength channel parameter are all write the space of value regularly of EEPROM among the MCU, promptly finished the module calibration process.
Described passage calibration process is applied in to be produced the debug phase, purpose is with the digital regulated information record of the important parameter of module and module tunable wavelength and preserves, optical module has promptly had the required important information of passage tuber function, and this is the precondition that realizes passages regulate.
In the module application stage after finishing calibration process, user's target wavelength is as required set the module transmitting order to lower levels by the upper strata webmaster, and module is adjusted into the process of target operation wavelength passage, is the module adjustment process.
Below in conjunction with passages regulate process shown in Figure 8, module control method of the present invention is described, its regulating step comprises:
(801) the extranets guard system is by exterior I IC interface and MCU communication, obtain the module parameter information of storing among the EEPROM of MCU, comprising information such as the work at present wavelength of tunable module and wavelength tuning ranges, network management system can report when the front module operation wavelength, network management system also can be chosen wherein operation wavelength λ x arbitrarily according to the needs of system configuration, and the form that adds λ x wavelength parameter with command word is handed down to MCU.
(802) after MCU receives the module wavelength adjustment order that webmaster issues, at first close laser.
(803) MCU is converted to the EEPROM first address corresponding with passage with the coded message of wavelength X x according to table 1 and table 2, and MCU obtains the data in 4 continuation address spaces after this first address.
(804) MCU is by inner IIC interface, the data that obtain are write respectively among RA1, RA2, RA3 and the RA4 according to fixing order, be converted to laser Output optical power analog regulation signal, laser extinction ratio analog signal, laser output wavelength tunnels analogy conditioning signal and laser luminous power detection adjustment analog regulation signal dorsad.Content update with memory module work at present wavelength among the EEPROM is the up-to-date wavelength information that issues simultaneously.
(805) open laser by micro-control unit MCU, treat module stability work after, promptly realized the conversion of service aisle.
In addition, MCU utilizes multinomial analog quantity index in the real-time detection module of high-precision adc, as laser bias current, the laser Output optical power, laser refrigeration electric current and laser tube core relative temperature etc. after MCU changes testing result, leave memory space fixing among the EEPROM in.MCU can further handle and produce a series of alarm signals to detection limit, and the pin of the I/O by MCU is drawn.After volatility sense command under the network management system, in time report webmaster.
As can be seen, this control method, only need network management system to obtain the wavelength tuning range of module according to the essential information in the module, the required wavelength channel of selective system in this scope again, the information that the command word of MCU that is handed down to module adds λ x wavelength parameter gets final product.
The passages regulate method generally is used in the application stage, and on the basis of finishing calibration process, the user can set the module transmitting order to lower levels by the upper strata webmaster by wavelength as required, realizes that wavelength is online tunable.
The method of described module wavelength scaling and adjusting proves practicable in optical-fiber network production practice process, can realize setting fast automatically of module operating state, the service aisle of online adjusting optical transmission module, operations has very high flexibility, matching with the automated debug software and hardware system can be under by artificial condition, realize the module automated production, production efficiency greatly is provided.
Claims (12)
1, a kind of tunable straight light modulation sending module comprises:
Laser is used to realize electricity/light signal conversion;
Automatic optical power control circuit comprises first potentiometer (RA1), is used to adjust the laser transmitting optical power; Also comprise luminous power testing circuit dorsad, exporting dorsad by an amplifier, luminous power detects voltage;
Directly modulation control circuit comprises second potentiometer (RA2), is used to adjust the extinction ratio of laser;
The automatic temperature-adjusting control circuit comprises the 3rd potentiometer (RA3), is used to adjust the die temperature of laser;
Laser shutdown control and performance monitoring circuit are used to control the shutoff and the performance monitoring of laser;
It is characterized in that,
Described first, second, third potentiometer is non-volatile digital regulation resistance;
The described testing circuit of luminous power dorsad comprises one the 4th potentiometer (RA4), is non-volatile digital regulation resistance, is connected between described amplifier's inverting input and the output, is used to adjust the amplification coefficient of luminous power testing circuit dorsad;
Described laser shutdown control and performance monitoring circuit comprise a micro-control unit, are used for shutoff and performance monitoring by this micro-control unit controls laser;
Wherein, described micro-control unit links to each other with described first, second, third, fourth potentiometer, and the numerical value adjustment of each potentiometer is controlled;
Described micro-control unit also comprises a memory, is used for storage laser tunable wavelength information, and the numerical value of described each potentiometer corresponding with each wavelength information.
2, tunable straight light modulation sending module as claimed in claim 1 is characterized in that described laser is tunable directly modulated lasers.
3, tunable straight light modulation sending module as claimed in claim 1 is characterized in that, described micro-control unit and described first, second, third, fourth potentiometer link to each other by inner IIC interface.
4, tunable straight light modulation sending module as claimed in claim 1, it is characterized in that described micro-control unit has the multi-channel analog digital conversion circuit, is used for the detection module performance index, detected value is deposited in the micro-control cell memory, and produced alarm signal according to comparison with normal index.
5, tunable straight light modulation sending module as claimed in claim 1 is characterized in that, described micro-control unit is by exterior I IC interface and extraneous communication.
6, a kind of tunable straight light modulation sending module as claimed in claim 1 is carried out the method for wavelength scaling, it is characterized in that, comprise the steps:
(A) host computer writes selected laser tunable wavelength information in the memory of described micro-control unit;
(B) adjust the numerical value of described each potentiometer by the micro-control unit controls, described each potentiometer converts the numerical value of adjusting to laser Output optical power analog regulation signal, laser extinction ratio analog regulation signal, laser output wavelength tunnels analogy conditioning signal and laser luminous power detection adjustment analog regulation signal dorsad, detect luminous power, extinction ratio, operation wavelength and the Output optical power detection signal of optical module output by extension instrument, until these module performance parameters till the current selected wavelength is issued to system requirements;
(C) numerical value that will work as above-mentioned module performance parameter each potentiometer when the current selected wavelength is issued to system requirements writes in the memory of described micro-control unit, and corresponding with the current selected wavelength of wherein storage.
(D) the fixed next wavelength of alternative repeats described step (A), (B), (C).
7, method as claimed in claim 6 is characterized in that, described step (A) is wavelength information to be write in the memory of micro-control unit via exterior I IC interface by host computer.
8, method as claimed in claim 6 is characterized in that, described step (B) is to control each potentiometer by inner IIC interface to adjust.
9, a kind of method that the described tunable straight light modulation sending module of claim 1 is carried out online adjustment is characterized in that, comprises the steps:
(1) the micro-control unit obtains the target operation wavelength that need be adjusted to;
(2) close laser by the micro-control unit;
(3) numerical value of described each potentiometer corresponding with it is inquired about according to the target operation wavelength that is obtained in the micro-control unit in memory;
(4) numerical value of current each potentiometer is adjusted according to the numerical value of each potentiometer of being stored in the micro-control unit;
(5) open laser by the micro-control unit.
10, method as claimed in claim 9 is characterized in that, in described step (4), the micro-control unit also is updated to the target operation wavelength with the work at present wavelength information of storing in the micro-control cell memory.
11, method as claimed in claim 9, it is characterized in that, described step (1) is by exterior I IC interface by the extranets guard system, from the memory of described micro-control unit, obtain and to supply tuning operation wavelength information, and after therefrom choosing the target operation wavelength that need be adjusted to, send to described micro-control unit.
12, method as claimed in claim 9 is characterized in that, described step (4) be by the micro-control unit by inner IIC interface, the value of each potentiometer of writing down in the memory is write in each potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102639 CN100568780C (en) | 2005-09-12 | 2005-09-12 | Tunable straight light modulation sending module and calibration and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510102639 CN100568780C (en) | 2005-09-12 | 2005-09-12 | Tunable straight light modulation sending module and calibration and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1933375A CN1933375A (en) | 2007-03-21 |
| CN100568780C true CN100568780C (en) | 2009-12-09 |
Family
ID=37879024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510102639 Active CN100568780C (en) | 2005-09-12 | 2005-09-12 | Tunable straight light modulation sending module and calibration and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100568780C (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009152658A1 (en) * | 2008-06-19 | 2009-12-23 | 中兴通讯股份有限公司 | Tunable laser module and controlling method thereof |
| CN101592762B (en) * | 2009-06-05 | 2012-07-04 | 中兴通讯股份有限公司 | Optical module and control method thereof |
| CN101814958A (en) * | 2010-03-16 | 2010-08-25 | 索尔思光电（成都）有限公司 | DWDM optical module capable of tuning 50GHz and 100GHz channel spacing and method thereof |
| CN101916960B (en) * | 2010-08-03 | 2013-05-01 | 武汉电信器件有限公司 | Device and method for adjusting multiband laser |
| CN101944705B (en) * | 2010-08-23 | 2013-03-20 | 索尔思光电（成都）有限公司 | Working method for DFB laser-based XFP optical module for transmission |
| WO2012106933A1 (en) * | 2011-07-27 | 2012-08-16 | 华为技术有限公司 | Optical transmitting and receiving method, device and system |
| CN102361216A (en) * | 2011-11-21 | 2012-02-22 | 苏州吉矽精密科技有限公司 | Solid laser control system |
| CN102752054A (en) * | 2012-07-12 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit |
| CN105162524B (en) * | 2012-07-12 | 2018-05-08 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and its optical module for optical network unit |
| CN103595484A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | Temperature-controlled optical transmitter |
| CN103001703B (en) * | 2012-12-28 | 2016-01-20 | 索尔思光电（成都）有限公司 | A kind of optical module operation wavelength control system and method |
| CN103337786B (en) * | 2013-05-29 | 2015-12-23 | 中国科学院半导体研究所 | Tunable laser module |
| CN103606812B (en) * | 2013-11-22 | 2015-11-04 | 武汉虹信通信技术有限责任公司 | A kind of laser optical power self-adaptation control method based on MCU |
| CN104320194A (en) * | 2014-09-30 | 2015-01-28 | 东南大学 | Parallel optical interconnection realization apparatus |
| CN106953694A (en) * | 2017-01-17 | 2017-07-14 | 中航光电科技股份有限公司 | A kind of airborne compact radio frequency optical sender |
| CN108988930B (en) * | 2018-06-20 | 2020-12-01 | 上海卫星工程研究所 | Communication rate self-adaptive control method and system for satellite laser communication subsystem |
-
2005
- 2005-09-12 CN CN 200510102639 patent/CN100568780C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1933375A (en) | 2007-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100568780C (en) | Tunable straight light modulation sending module and calibration and control method | |
| US5278404A (en) | Optical sub-system utilizing an embedded micro-controller | |
| CN101326692B (en) | Optical transmission circuit | |
| US9601892B2 (en) | Method and system for managing thermally sensitive optical devices | |
| US7460572B2 (en) | Optical module and method for monitoring and controlling wavelengths | |
| WO2018119637A1 (en) | Method and device for controlling wavelength of light emitting assembly | |
| US7850083B2 (en) | Digital control system for an electro-optical device | |
| CN100595985C (en) | Automatic control system of tunable laser based on lock wave | |
| CA2474876C (en) | Optical transmission module with digital adjustment and the adjusting method | |
| CN102752055B (en) | EPON and optical module for optical network unit thereof | |
| JP2009081512A (en) | Optical transmitting apparatus, and setting-value determining method | |
| CN112564802B (en) | Dimmable module and full-temperature wave locking method thereof | |
| US6583926B1 (en) | Optical amplifiers with age-based pump current limiters | |
| CN100472900C (en) | Wavelength control circuit for tunable laser | |
| CN201118093Y (en) | Tunable laser automatic control device based on lock wave | |
| US10270533B2 (en) | Wavelength tunable laser module and method of controlling wavelength thereof | |
| EP1772932B1 (en) | Light source for optical communication and its wavelength monitoring/controlling method | |
| CN1863014B (en) | Temperture compensating method and apparatus for extinction ratio parameter without cooling laser | |
| US10673205B2 (en) | Wavelength tunable laser module and method of controlling wavelength thereof | |
| CN102752676B (en) | EPON and optical module for optical network unit thereof | |
| CN202738051U (en) | Passive optical network and optical network unit optical module thereof | |
| CN104753601A (en) | Optical module | |
| WO2009152658A1 (en) | Tunable laser module and controlling method thereof | |
| CN202906916U (en) | Optical network unit optical module | |
| Pulvirenti et al. | Characterization of the electro-optical transceivers in the KM3NeT optical network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |