CN101592762B - Optical module and control method thereof - Google Patents

Optical module and control method thereof Download PDF

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Publication number
CN101592762B
CN101592762B CN 200910107695 CN200910107695A CN101592762B CN 101592762 B CN101592762 B CN 101592762B CN 200910107695 CN200910107695 CN 200910107695 CN 200910107695 A CN200910107695 A CN 200910107695A CN 101592762 B CN101592762 B CN 101592762B
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CN
China
Prior art keywords
temperature
control circuit
laser
electro
circuit
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CN 200910107695
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Chinese (zh)
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CN101592762A (en
Inventor
曹建光
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/024Cooling arrangements
    • H01S5/02407Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
    • H01S5/02415Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling by using a thermo-electric cooler [TEC], e.g. Peltier element
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/572Wavelength control
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/024Cooling arrangements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/026Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
    • H01S5/0265Intensity modulators

Abstract

The invention discloses an optical module and a control method thereof. The optical module is used for realizing the sending and receiving of optical signals, and comprises an electroabsorption laser, a temperature detection module, a negative feedback temperature control circuit and a Bragg voltage control circuit, wherein the electroabsorption laser comprises a thermistor, a thermoelectric refrigerating unit and a Bragg grating; the thermistor, the temperature detection module and the negative feedback temperature control circuit are connected orderly to form an automatic temperature control circuit; when the automatic temperature control circuit detects that the temperature of the electroabsorption laser is higher than a designed working temperature, the thermoelectric refrigerating unit is started for refrigeration; when the automatic temperature control circuit detects that the temperature of the electroabsorption laser is lower than the designed working temperature, the thermoelectric refrigerating unit is started for heating; and the Bragg voltage control circuit is connected with the Bragg grating, and changes the reflection coefficient of the Bragg grating by controlling the voltage of the Bragg grating. The optical module has wavelength tunable function and low cost.

Description

A kind of optical module and control method thereof

Technical field

The present invention relates to optical transport technology, specifically, relate to a kind of optical module and control method thereof.

Background technology

As the critical component in the optical transmission system, optical module determines the performance of optical transmission system to a great extent.Optical module outputs to optical fiber to light signal with electric signal through electric light conversion back, receives the light signal that far-end transmits simultaneously, converts light signal to electric signal, thereby realizes that light signal sends and receives.In DWDM (dense wave division multipurpose) system, the smallest passage of optical fiber G.652/G.655 of being applicable to that the operation wavelength of laser instrument will satisfy ITU-TG.692 (the G.692 agreement of International Telecommunications Union's telecommunication standards group) regulation is spaced apart the specific wavelength requirement of 50GHZ or 100GHz.At present, in optical transmission system, generally adopt non-tunable wave length optical module; Because non-tunable wave length optical module can only produce a certain wavelength; So will get the raw materials ready separately to each specific wavelength when producing, increased the tank farm stock of getting the raw materials ready like this, production cost is significantly improved.

New reconfigurable network structural requirement wavelength must be adjustable.Part manufacturer (like Intel, Bookham, Santur) is in order to realize the function of tunable wave length; Released all band tunable laser, though the technology of each manufacturer is different, the ubiquity cost is high, control is complicated; Power consumption is big, need add shortcomings such as adjuster.

Summary of the invention

In view of this, the invention provides a kind of optical module and control method thereof, not only realized the tunable wave length function, simultaneously with low cost.

In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:

A kind of optical module comprises electro-absorption laser, temperature sensing circuit, negative feedback temperature-control circuit and Prague voltage control circuit, and said electro-absorption laser comprises thermistor, TEC, Bragg grating; Said Prague voltage control circuit links to each other with said Bragg grating, through controlling the reflection coefficient that said Bragg grating voltage changes said Bragg grating; Said thermistor, temperature sensing circuit, negative feedback temperature-control circuit connect successively; Constitute automatic temperature-controlled circuit; Said automatic temperature-controlled circuit is controlled said electro-absorption laser actuator temperature and is arrived the design effort temperature; When detecting said electro-absorption laser actuator temperature and be higher than the design effort temperature, start TEC and freeze; When detecting said electro-absorption laser actuator temperature and be lower than the design effort temperature, start TEC and heat.

In a kind of embodiment of above-mentioned optical module; Also comprise detection diode backlight, back facet current testing circuit, negative feedback drive current control circuit; Said detection diode backlight is built in the said electro-absorption laser; Link to each other successively with back facet current testing circuit, negative feedback drive current control circuit, constitute automatic optical power control circuit, said automatic optical power control circuit carries out feedback adjustment according to detected laser instrument Output optical power to the drive current of laser instrument.

In a kind of embodiment of above-mentioned optical module; Said negative feedback drive current control circuit comprises trans-impedance amplifier, comparer; The photocurrent that the laser instrument Output optical power is converted to through detection diode backlight is behind said trans-impedance amplifier; Be input to said comparer and compare, laser drive current is adjusted through comparing difference with setting voltage.

In a kind of embodiment of above-mentioned optical module, said Prague voltage control circuit comprises D/A converting circuit, penetrates with amplifying buffer circuit, and voltage control signal passes through said D/A converting circuit successively, penetrates with amplifying buffer circuit, arrives said Bragg grating.

In a kind of embodiment of above-mentioned optical module, said optical module comprises the 10G optical module.

The invention also discloses a kind of control method of optical module, comprise the steps:

A1, the eye pattern point of crossing of setting said electro-absorption laser and the control numerical value of extinction ratio;

A2, adjust said electro-absorption laser Prague voltage, make said electro-absorption laser wavelength be adjusted to preset range through Prague voltage control circuit;

A3, adjust said electro-absorption laser working temperature to the design effort temperature, make said electro-absorption laser wavelength be adjusted to preset value through automatic temperature-controlled circuit;

A4, through automatic optical power control circuit, adjust the Output optical power of said electro-absorption laser.

Optical module of the present invention; Control the reflection coefficient that Bragg grating voltage changes Bragg grating through Prague voltage control circuit, make grating be directed against specific wavelength transmission fully, other wavelength then are reflected; Reach the tuning of wavelength on a large scale; Reach the design effort temperature through automatic temperature-controlled circuit control laser instrument, when detecting laser temperature and be higher than the design effort temperature, start TEC and freeze; When detecting laser temperature and be lower than the design effort temperature, start TEC and heat; Thereby can realize among a small circle wavelength tuning and stable laser output wavelength.

Description of drawings

Fig. 1 is the opto-electronic conversion implementation framework figure of an embodiment of the present invention;

Fig. 2 is the peripheral control circuit figure of the laser instrument of an embodiment of the present invention;

Fig. 3 is the module electric light conversion portion debugging process flow diagram of an embodiment of the present invention;

Fig. 4 is the tunable optical module frame chart of an embodiment of the present invention;

Fig. 5 is that the auto light power control of an embodiment of the present invention realizes circuit diagram;

Fig. 6 is that the laser tube core temperature control of an embodiment of the present invention realizes circuit diagram;

Fig. 7 is that the BRAG control of an embodiment of the present invention realizes circuit diagram.

Embodiment

Elaborate below in conjunction with the accompanying drawing specific embodiments of the invention.

Optical module of the present invention mainly is a kind of narrow-band tunable optical module, is used for DWDM (dense wave division multipurpose) fibre-optic transmission system (FOTS) of 10G, for digital fiber communication provides electricity/light at a high speed, light/electricity conversion.It has online tunable wave length function, and wavelength can satisfy the specific wavelength requirement that smallest passage that G.692 ITU-T stipulate is spaced apart 50GHZ or 100GHz.

As shown in Figure 1, aspect opto-electronic conversion, the light signal of input is converted into electric signal through photodiode (APD), and electric signal can be transferred to external electrical interface.

On the other hand, for realizing the electric light conversion, adopt the tunable electro-absorption laser that refrigeration is arranged.Utilize laser instrument in-built electrical absorption (EA) modulator and outside EA laser driver to realize the translation function of electric signal to light signal.Through driver control circuit, the control end of control EA laser driver can be realized the technical indicator adjustment of laser optical interface.

Online tunable in order to realize wavelength, through peripheral laser control circuit laser instrument is implemented control, can realize satisfying online tuning between the specific wavelength that G.692 ITU-T stipulate.

The peripheral control circuit of laser instrument and with the laser instrument inner structure be connected control as shown in Figure 2, it comprises automatic optical power control circuit, automatic temperature-controlled circuit, voltage control circuit.

Wherein, adopt automatic optical power control circuit to adjust the output average power with stable laser.As shown in Figure 2; Automatic optical power control circuit comprises detection diode backlight (PD), back facet current testing circuit, negative feedback drive current control circuit; In the built-in laser instrument of detection diode backlight, link to each other successively, through detecting the photogenerated current of detection diode backlight (PD) with back facet current testing circuit, negative feedback drive current control circuit; Can detect the Output optical power of laser instrument; As feedback quantity, adopt PID (ratio adjusting) negative feedback control algolithm, with the Output optical power of laser instrument through PID negative feedback drive current control circuit; Control the drive current in the luminous chamber (GAIN) of flowing through laser instrument, thereby realize the control of the luminous power of laser instrument.

Through automatic temperature-controlled circuit and voltage control circuit, can realize the stable and tunable wave length of laser output wavelength.Wherein, automatic temperature-controlled circuit is made up of thermistor, temperature sensing circuit, negative feedback temperature-control circuit, through the change in resistance of the built-in thermistor of laser instrument; Can realize the detection of laser tube core temperature; Adopt PID negative feedback control algolithm,, can control the electric current and the direction that flow through TEC (TEC) through PID negative feedback temperature-control circuit; Its cardinal rule is: when detecting die temperature and being higher than the design effort temperature, then start TEC and freeze; When detecting die temperature and being lower than the design effort temperature, then start TEC and heat.Through the die temperature of control laser instrument, thus can stable laser output wavelength and the wavelength tuning among a small circle of realizing laser instrument.Wherein, the design effort temperature is relevant with wavelength that need be tuning, and different wavelengths is to there being different design effort temperature.

Voltage control circuit; Be connected to the built-in Bragg grating of laser instrument (BRAG); Bragg grating voltage through the control laser instrument can change the Bragg grating reflection coefficient, makes grating be directed against specific wavelength transmission fully; Other wavelength then are reflected, and reach the tuning purpose of wavelength on a large scale with this.

To sum up,, can realize the online wavelength tuning function of laser instrument, simultaneously, also can guarantee the stability of laser output wavelength through being used of Prague Control of Voltage and the control of TEC circuit.

The control method of optical module, its main flow process is as shown in Figure 3, mainly comprises:

1, the control numerical value of the eye pattern point of crossing of setting laser device and extinction ratio;

2, through automatic temperature-controlled circuit, adjustment laser works temperature is to the design effort temperature; General, comprise a plurality of optical channels in the optical module, therefore, in fact the working temperature of adjustment laser instrument comprises the laser tube core temperature of adjusting each passage;

3, through Prague voltage control circuit, adjustment laser instrument Prague voltage is to appropriate value, and appropriate value is general so that laser wavelength is adjusted to preset range is standard;

4, through automatic temperature-controlled circuit, readjust the die temperature of laser instrument, adjust to preset value up to wavelength;

5, through automatic optical power control circuit, can the Output optical power of laser instrument be adjusted to desired scope;

6, note all adjustment parameter values of each passage.

It should be noted that above flow process is a kind of example, because the precision that wavelength tuning is had relatively high expectations, therefore, wavelength tuning is a comparatively complicated process.Wavelength tuning under wavelength tuning under the Control of Voltage and the temperature control generally is not disposable completion, but a process of proofreading and correct repeatedly, simultaneously, two precedences that wavelength tuning is not strict yet.Common, the wavelength tuning of adjusting through Prague voltage is a coarse adjustment process, promptly wavelength will be tuning on a large scale; And the wavelength tuning of adjusting through temperature control circuit is a fine tuning process, and promptly wavelength will be tuning among a small circle.The temperature control of temperature control circuit from more accurate angle, can be subdivided into adjustment and locking; Wherein, adjustment is meant temperature control circuit according to desired wavelength preset value, and the laser tube core temperature is adjusted to the pairing design effort temperature of this wavelength preset value; Locking is meant in the laser works process, temperature control circuit all the time the locked laser die temperature on desired design effort temperature, thereby can keep the stable of laser output wavelength.

As shown in Figure 4, a kind of optical module of the embodiment of the invention, photodiode (APD) receiving optical signals; Produce and the proportional photogenerated current of luminous power, the photodiode receiving optical signals produces and the proportional photogenerated current of luminous power; Photogenerated current is admitted to transceiver (Tranceiver); In transceiver, photogenerated current converts positive voltage signal to through trans-impedance amplifier, and positive voltage signal is through the judgement of amplitude limit amplification and CDR; Convert data-signal to, data-signal carries out serial/separate serial operation by the serial in the transceiver/deserializer part again.Serial/deserializer part can be accomplished the conversion of serial signal to parallel signal (parallel signal that for example meets the SFI.4 agreement).In the light inlet power detection, can be through the serial connection sample resistance, photogenerated current utilizes operational amplifier that the sample resistance voltage is detected through this sample resistance, thereby accomplishes the detection of luminous power.

The automatic optical power control circuit block diagram is as shown in Figure 5; Convert the Output optical power dorsad of laser instrument into photocurrent through the built-in detection diode backlight of laser instrument, photocurrent is given the negative feedback controller (comparer with backfeed loop after striding resistance and amplifying; FEEDBACK CONTROL adopts pid control algorithm; In backfeed loop, realize the setting of pid control parameter through resistance-capacitance network) compare with setting value (the pairing magnitude of voltage of etalon optical power), control the driving bias current of laser instrument with the difference signal of comparison; Make laser instrument dorsad Output optical power be definite value, thereby reach the adjustment and the purpose of stable laser luminous power.Above-mentioned setting value, the built-in MCU through optical module is realized through the DAC (digital to analog converter) of 12bit.

Automatic temperature-controlled circuit (ATC) circuit block diagram is as shown in Figure 6, and it mainly is through the size of current and the direction of control thermoelectric cooling module (TEC), makes the laser tube core temperature remain on setting value, thereby makes the output light wavelength (frequency) of laser instrument keep stable.When laser temperature was higher than the design effort temperature, ATC made the thermoelectric cooling module (TEC) of laser instrument obtain forward refrigeration electric current, the refrigerator heat absorption, and the laser tube core temperature will reduce; When laser temperature was lower than the design effort temperature, ATC made thermoelectric cooling module (TEC) obtain reverse heating current, and refrigerator heats tube core, and the laser tube core temperature will raise, thereby the working temperature of laser tube core is tended towards stability.The ATC function realizes, the electric bridge of forming through the built-in thermistor of laser instrument comes the actual temperature of detection laser tube core and by the error of D/A design temperature.Among Fig. 6, two input ends of comparer, the bleeder circuit that the thermistor by in fixed resistance value resistance and the laser instrument of an input end connection is formed, this bleeder circuit is as temperature sensing circuit, and its output voltage is input to an input end of comparer; Another input end of comparer, input be the magnitude of voltage of setting by MCU control D/A (corresponding to the magnitude of voltage of design effort temperature); The magnitude of voltage difference relatively that the output voltage of temperature sensing circuit and MCU control D/A set; Input as the full-bridge controller that constitutes by operational amplifier; The output of full-bridge controller is as the input of power amplifier, and the output of power amplifier drives TEC, thereby changes the temperature of laser instrument.

Prague voltage control circuit block diagram is as shown in Figure 7, and wherein, 12 D/A output of MCU control simulation Prague voltage is penetrated with amplifier buffer through what form with operational amplifier, arrives the built-in Bragg grating of laser instrument.

Debugging flow process in the optical module real work comprises:

1, at first the setting value of control eye pattern point of crossing and extinction ratio in the control circuit of EA laser driver is accomplished.The EA laser driver has extinction ratio and point of crossing control pin, and through the aanalogvoltage of 12 D/A outputs of MCU control, this aanalogvoltage is penetrated with after the circuit buffering through what be made up of operational amplifier, directly gives the corresponding control pin of EA laser instrument.Through changing the control signal that MCU exports to D/A, extinction ratio and point of crossing that can corresponding adjustment optical interface.

2, according to preset requirement (for example, instructing numerical value in the laser instrument index book), calculate the D/A numerical value of the laser temperature control circuit (ATC) of each passage, be written in the module.

3, can utilize wavemeter to carry out wavelength measurement; Show wavelength through observing wavemeter; Adjust the D/A numerical value of laser instrument Prague voltage control circuit repeatedly, wavelength is adjusted on the grid of the corresponding ITU regulation of wavelength preset range (desired wavelength coverage in the actual working environment).

4, wavelength offset require ± the 3GHz scope in after, the side mode suppression ratio of testing laser device wavelength is adjusted the D/A value of laser instrument Prague voltage control circuit once more, requires side mode suppression ratio to reach maximum.

5, step 4 can cause the little deviation of wavelength, through the D/A numerical value of adjustment temperature-control circuit (ATC), makes wavelength readjust in the scope of requirement again.

6, adjust the D/A numerical value of automatic optical power control circuit (APC), adjust the Output optical power of laser instrument.

7, accomplish above-mentioned steps, the parameter adjustment of a passage of laser instrument is accomplished.Through calibration, parameter all is written in the storer, write down all numerical value of this passage.

Optical module of the present invention is compared with other optical module, has the tunable wave length function; Can cover C-band 50GHz or 100GHz 16 wavelength at interval; And, when covering wider wavelength, lower cost is arranged again, the dense wavelength division system there is important meaning.And control method is also simple relatively.

Above content is to combine concrete preferred implementation to the further explain that the present invention did, but this instance of just lifting for ease of understanding should not think that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can make various possible being equal to and change or replacement, these changes or replacement all should belong to protection scope of the present invention.

Claims (5)

1. an optical module is characterized in that, comprises electro-absorption laser, temperature sensing circuit, negative feedback temperature-control circuit and Prague voltage control circuit, and said electro-absorption laser comprises thermistor, TEC, Bragg grating; Said Bragg grating is built in the said electro-absorption laser; Said Prague voltage control circuit links to each other with said Bragg grating, through controlling the reflection coefficient that said Bragg grating voltage changes said Bragg grating; Said thermistor, temperature sensing circuit, negative feedback temperature-control circuit connect successively; Constitute automatic temperature-controlled circuit; Said automatic temperature-controlled circuit is controlled said electro-absorption laser actuator temperature and is arrived the design effort temperature; When detecting said electro-absorption laser actuator temperature and be higher than the design effort temperature, start TEC and freeze; When detecting said electro-absorption laser actuator temperature and be lower than the design effort temperature, start TEC and heat; Said Prague voltage control circuit comprises D/A converting circuit, penetrates with amplifying buffer circuit, and voltage control signal passes through said D/A converting circuit successively, penetrates with amplifying buffer circuit, arrives said Bragg grating.
2. optical module as claimed in claim 1; It is characterized in that; Also comprise detection diode backlight, back facet current testing circuit, negative feedback drive current control circuit, said detection diode backlight is built in the said electro-absorption laser, links to each other successively with back facet current testing circuit, negative feedback drive current control circuit; Constitute automatic optical power control circuit, said automatic optical power control circuit carries out feedback adjustment according to detected laser instrument Output optical power to the drive current of laser instrument.
3. optical module as claimed in claim 2; It is characterized in that; Said negative feedback drive current control circuit comprises trans-impedance amplifier, comparer; The photocurrent that the laser instrument Output optical power is converted to through detection diode backlight is input to said comparer and compares with setting voltage behind said trans-impedance amplifier, through difference relatively laser drive current is adjusted.
4. like the arbitrary described optical module of claim 1 to 3, it is characterized in that said optical module is used for the dense wavelength division fibre-optic transmission system (FOTS) of 10G.
5. the control method like claim 2 or 3 said optical modules is characterized in that, comprises the steps:
A1, the eye pattern point of crossing of setting said electro-absorption laser and the control numerical value of extinction ratio;
A2, adjust said electro-absorption laser Prague voltage, make said electro-absorption laser wavelength be adjusted to preset range through Prague voltage control circuit;
A3, adjust said electro-absorption laser working temperature to the design effort temperature, make said electro-absorption laser wavelength be adjusted to preset value through automatic temperature-controlled circuit;
A4, through automatic optical power control circuit, adjust the Output optical power of said electro-absorption laser.
CN 200910107695 2009-06-05 2009-06-05 Optical module and control method thereof CN101592762B (en)

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PCT/CN2009/073891 WO2010139144A1 (en) 2009-06-05 2009-09-11 Optical module and control method thereof

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