CN106253988A - Optical module and operating temperature control method thereof - Google Patents
Optical module and operating temperature control method thereof Download PDFInfo
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- CN106253988A CN106253988A CN201610882321.8A CN201610882321A CN106253988A CN 106253988 A CN106253988 A CN 106253988A CN 201610882321 A CN201610882321 A CN 201610882321A CN 106253988 A CN106253988 A CN 106253988A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES 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
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses optical module and operating temperature control method thereof, described optical module includes: laser emission element, and it includes laser instrument and drive circuit；The extinction ratio calibration in advance of described laser instrument is in the range of specific extinction ratio；MCU and TEC control circuit, described MCU is for, after the temperature value obtaining temperature sensor detection, determining the operating temperature setting value corresponding to the temperature value of acquisition；According to the operating temperature setting value determined, the operating temperature controlling TEC control circuit regulation laser instrument is corresponding temperature.Owing to the operating temperature of permission laser instrument is within the specific limits with ambient temperature respective change, thus heating or the power consumption of refrigeration are saved；Further, in advance extinction ratio is calibrated to a suitable scope so that extinction ratio still can meet requirement in the range of the temperature change of laser instrument, compensates without to BIAS electric current, has further saved compensation power consumption.
Description
Technical field
This case is that submission, Application No. 201310196860.2, patent name on 05 24th, 2013 are for being applied to width
Optical module in temperature range and the divisional application of operating temperature control method thereof.
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of optical module being applied in wide temperature range and work thereof
Temperature control method.
Background technology
In recent years, along with enhancement mode 8.5G optical-fibre channel and the fast development of 10G Ethernet high speed optical networks agreement, to super
The demand of high rate optical transceiver module increases day by day, and the requirement to module port density and power consumption is more and more higher simultaneously.
10Gbit/s optical transceiver module in the past few years, experienced by from 300pin MSA, XENPAK (10,000,000,000 ether
Net), XPAK, X2, XFP optical module (ten thousand mbit ethernet optical transceiver modules) to SFP optical module (gigabit Ethernet optical transceiver module)+
Transformation.SFP+ optical module is as the upgrading of SFP (small form-factor pluggables, SFP) optical module
Version, meets IEEE 802.3AE/AQ and 8G/10G fiber channel protocol specification, and module size reduces 40% compared with XFP, tool
Having higher port density and lower power consumption, transmission range also increases to 10km, 40km and 80km from 300m.
SFP+ optical module of the prior art, when distance (such as 40km and 80km) is transmitted, needs to use loss less
Window wavelength be transmitted the receiving sensitivity requirement of guarantee communications, general use 1550nm single-mode fiber to carry out
Transmission.Directly modulation can produce serious laser chip phenomenon simultaneously, and (bias current of laser instrument is modulated by signal, and light takes place frequently
Raw skew and shake).Chirp can produce serious distortion.This distortion, with transmission range, transmission bandwidth and channel number
Increase and become the most serious.Comprehensive factors above, distance SFP+ generally uses the externally modulated laser of 1550nm, such as, makes
With more universal EML (Electroabsorption Modulated Laser, electro-absorption modulation is radium-shine) laser instrument.EML laser
The characteristic of device can have greatly changed with the change of operating temperature so that the parameters such as the power of optical signal, wavelength occur the biggest
Change, eye diagram quality also becomes very poor；Also can be very poor by the signal quality after fiber-optic transfer, the bit error rate becomes greatly thus shadow
Ring the q&r of communication.Under normal circumstances for ensureing the quality of optical signal, it is necessary to keep swashing of EML laser instrument transmitting
Luminous power and the extinction ratio of light are constant, and the change of the wavelength of laser is less than predetermined scope；Thus, it is desirable to keep EML laser
The operating temperature of device constant.
In prior art, need to carry out the SFP+ optical module of long range propagation as shown in Figure 1a, generally use and be built-in with TEC
Laser instrument, such as EML laser instrument.TEC (Thermoelectric cooler, thermoelectric refrigerator) control circuit in optical module
Temperature constant within keeping laser instrument, i.e. keeps the working temperature constant of laser instrument.Specifically, laser instrument is also built-in with
Thermocouple, along with the change of temperature, the resistance of thermocouple also can change accordingly；TEC control circuit is built-in by detection laser
The resistance of thermocouple, the built-in TEC of closed loop regulation laser instrument carries out heating or freeze so that the temperature in laser instrument keeps permanent
Fixed.
But, in hot environment more than 70 DEG C or the low temperature environment of less than-5 DEG C, if use above-mentioned heating or
The method of refrigeration makes the temperature in laser instrument keep constant, then need to consume bigger electric current；Owing to needing to consume bigger electricity
Stream, power consumption and the heat dispersion of the SFP+ optical module that this is little to volume, component density is high propose the requirement being difficult to；Following table
1 shows under different temperatures environment, the restriction of maximum current consumed to optical module:
Table 1
| Temperature range | Maximum current |
| -5C～+70C (business level) | <450mA |
| -40C～+85C (technical grade) | <570mA |
Therefore, use the distance SFP+ optical module of the above-mentioned constant technology of holding laser temperature in broader temperature range
During work, such as technical grade temperature (-40 DEG C～+85 DEG C), in the hot environment of more than 70 DEG C or the low temperature environment of less than-5 DEG C
During work, it is used for exceeding the limit of the internal TEC functional circuit of optical module to the TEC electric current that EML TOSA carries out heating and freeze,
Cause TEC circuit operational failure, EML TOSA operating temperature no longer to maintain target temperature constant, thus cause optical module work to be lost
Effect, more very in the case of can damage EML TOSA.
For solving the problems referred to above, the patent of Publication No. 102970080A discloses a kind of optical module and laser works thereof
The control method of temperature, the method no longer maintains the operating temperature of laser instrument to be steady state value, but allows the work temperature of laser instrument
Degree correspondingly changes with ambient temperature within the specific limits；Meanwhile, regulation BIAS (biasing) electric current is used as compensatory device, to enter
One step also can use regulation MOD (modulation) voltage, or EA (Electro-Absorption, electric absorption) voltage is as compensating hands
Section so that luminous power and the extinction ratio of the laser that laser instrument is launched are constant.Owing to allowing the operating temperature of laser instrument with environment temperature
Degree has corresponding change, reduces the difference between the operating temperature of laser instrument and ambient temperature；Such that make more than 70 DEG C
Hot environment or the low temperature environment of less than-5 DEG C in, be also not necessarily the built-in TEC of laser instrument and excessive heating or refrigeration be provided
Electric current, thus use the distance SFP+ optical module of this technology to can apply within the scope of wider temperature.
But, in actual applications, during it was found by the inventors of the present invention that BIAS electric current or MOD voltage are compensated, still
So can consume certain power consumption；Especially in hot environment, in order to BIAS electric current is compensated, need to strengthen BIAS electricity
Stream, this makes to cause power consumption to increase because BIAS compensates electric current under hot environment, causes that optical module housing caloric value is relatively big, dispels the heat
Difficulty, occurs the phenomenon that device lost efficacy because temperature is too high.Can therefore, it is necessary to provide the optical module that a kind of power consumption is lower to be allowed to
To be applied in the environment of more wide temperature range.
Summary of the invention
The embodiment provides a kind of optical module being applied in wide temperature range and operating temperature regulation side thereof
Method, is allowed to can be applicable in order to reduce the power consumption of optical module in the environment of more wide temperature range.
According to an aspect of the invention, it is provided a kind of optical module being applied in wide temperature range, including:
Laser emission element, it includes laser instrument and drive circuit；The extinction ratio calibration in advance of described laser instrument is to special
In the range of fixed extinction ratio；
Microprogram control unit MCU and TEC control circuit, described MCU is at the temperature value obtaining temperature sensor detection
After, according to the corresponding relation between the temperature value prestored and operating temperature setting value, determine corresponding to the temperature value of acquisition
Operating temperature setting value；According to the operating temperature setting value determined, control described TEC control circuit and regulate described laser instrument
Operating temperature be corresponding temperature.
According to another aspect of the present invention, it is provided that the operating temperature control method of a kind of optical module, including:
MCU in optical module is after the temperature value obtaining temperature sensor detection, according to the temperature value prestored and work
Make the corresponding relation between desired temperature, determine the operating temperature setting value corresponding to the temperature value of acquisition；And
According to the operating temperature setting value determined, control described TEC control circuit and regulate the work temperature of described laser instrument
Degree is corresponding temperature；
Wherein, the extinction ratio calibration in advance of the laser instrument in described optical module is in the range of specific extinction ratio.
The optical module of the embodiment of the present invention no longer maintains the operating temperature of laser instrument to be steady state value, but allows laser instrument
Operating temperature correspondingly changes with ambient temperature within the specific limits, thus without consumption within the scope of a wider temperature
Excessive heating or the power consumption of refrigeration；Further, in advance the extinction ratio of laser instrument is calibrated to a suitable scope so that delustring
Ratio still can meet protocol requirement in the range of the temperature change of laser instrument, enters without to BIAS electric current or MOD voltage
Row compensates.
Accompanying drawing explanation
Fig. 1 a is the partial circuit schematic diagram in the optical module of prior art；
Fig. 1 b is the internal circuit block diagram in the optical module of the embodiment of the present invention；
Fig. 2 is the internal circuit schematic diagram of the laser instrument of the embodiment of the present invention；
Fig. 3 is the internal circuit block diagram of the TEC control circuit of the embodiment of the present invention；
Fig. 4 is the physical circuit schematic diagram of the voltage comparator circuit of the embodiment of the present invention, normal voltage output circuit.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, referring to the drawings and enumerate preferred reality
Executing example, the present invention is described in more detail.However, it is necessary to explanation, the many details listed in description are only
Make the reader one or more aspects of the present invention are had a thorough explanation, can also even without these specific details
Realize the aspects of the invention.
The term such as " module " used in this application, " system " is intended to include the entity relevant to computer, such as but does not limits
In hardware, firmware, combination thereof, software or executory software.Such as, module it may be that it is not limited to: process
Process, processor, object, executable program, the thread of execution, program and/or the computer run on device.
The present inventor it is considered that one can be calibrated in advance suitably by the luminous power of optical module, extinction ratio
In the range of；When optical module puts into application, the operating temperature no longer maintaining laser instrument is steady state value, but allows laser instrument
Operating temperature correspondingly changes with ambient temperature within the specific limits；Meanwhile, the most no longer BIAS electric current, MOD voltage are mended
Repay.Although, the operating temperature of laser instrument changes within the specific limits, and correspondingly, the wavelength of laser instrument, luminous power, extinction ratio are also
Can be changed within the specific limits with the operating temperature of laser instrument；But owing in advance luminous power, extinction ratio being calibrated in advance
To one suitably in the range of；Such that make the luminous power of laser instrument, extinction ratio also can have necessarily with the operating temperature of laser instrument
Variation, but mobility scale can be allowed in the range of agreement specification.Therefore, BIAS electric current, MOD voltage need not be compensated
The wavelength in the range of agreement specification, luminous power, extinction ratio can also be obtained in a wide temperature range.Therefore, this
Bright method, owing to need not compensate BIAS electric current, reduce further the power consumption of optical module；The most in high temperature environments,
The compensation electric current to BIAS electric current need not be strengthened, it is possible to avoid TEC circuit to work when high temperature or low temperature actual effect, be more conducive to
Optical module application in hot environment.
Describe the technical scheme of the embodiment of the present invention below in conjunction with the accompanying drawings in detail.What the embodiment of the present invention provided is applied to width
The internal circuit of the optical module in temperature range as shown in Figure 1 b, including laser emission element 101, MCU
(Microprogrammed Control Unit, microprogram control unit) 103, TEC control circuit 104, EA biasing circuit 105.
Laser emission element 101 launches optical signal in order to the signal of telecommunication received according to optical module；Such as, if optical module is concrete
For the optical module in Ethernet optical transmitter and receiver, the then number that the switch during laser emission element 101 receives Ethernet optical transmitter and receiver sends
Word differential electric signal, and launch corresponding optical signal according to the digital differential signal of telecommunication received.
Laser emission element 101 includes: laser instrument 121 and drive circuit 122 thereof.The driving of laser emission element 101
Circuit 122 drives the laser light emitting light source in laser instrument 121 to launch the light letter of specific wavelength according to the signal of telecommunication that optical module receives
Number.The digital differential signal of telecommunication that i.e. drive circuit 122 receives according to optical module drives the laser light emitting light source in laser instrument 121
(LD in Fig. 2) launches the optical signal of specific wavelength.Specifically, drive circuit 122 is connected with 20PIN (pin) electrical interface, light
Module is connected with the circuit outside optical module or equipment by 20PIN electrical interface.Drive circuit 122 is being received by electrical interface
After the digital differential signal of telecommunication, CDR (clock and data recovery) device, the equilibrium etc. through bypassing obtains modulated signal after processing,
And modulated signal is sent to laser instrument 121, for the optical signal of laser instrument 121 output is modulated.Drive circuit 122 is
Laser instrument 121 provides BIAS electric current and modulated signal, to drive laser light emitting light source (LD in Fig. 2) to launch the light of specific wavelength
Signal.Wherein, the BIAS electric current of drive circuit 122 output and MOD (modulation) voltage of modulated signal are all by MCU103 control
Set.
It is preferred that laser instrument 121 can be selected for high efficiency, the EML laser instrument of low-power consumption or CML laser instrument.
EA biasing circuit 105 is with thinking that laser instrument 121 provides EA bias voltage.EA biasing circuit 105 is generally by driving by force
The operational amplifier of ability and charge pump voltage reversal device (Charge Pump Voltage Inverters) are constituted, will
MCU103 is by the positive voltage of DAC (Digital-to-Analog Converter, digital analog converter) output port output
Be converted into negative voltage export to drive circuit 122 do negative pressure biasing.It is to say, MCU103 can control EA biasing circuit 105
The EA bias voltage of output.
MCU103 is connected with drive circuit 122, its BIAS electric current that can control drive circuit 122 output and MOD voltage
Size.Such as, MCU103 is connected by iic bus with drive circuit 122, and MCU103 passes through iic bus to drive circuit 122
Sending BIAS current setting value, drive circuit 122, according to the BIAS current setting value received, exports correspondingly sized BIAS electricity
Stream；MCU103 sends MOD voltage setting value by iic bus to drive circuit 122, and drive circuit 122 is according to the MOD electricity received
Pressure setting value, exports correspondingly sized MOD voltage.For another example, MCU103 also can be come by the DAC output port corresponding voltage of output
Control BIAS electric current and the MOD voltage of drive circuit 122 output.
As in figure 2 it is shown, built-in thermocouple and TEC in laser instrument 121.TEC control circuit 104 is concrete and laser instrument 121
In thermocouple be connected with TEC, in order to regulate the temperature in laser instrument 121, i.e. regulate laser instrument 121 operating temperature.
MCU103 with TEC control circuit 104 is connected, and it can control TEC control circuit 104 and regulate the work of laser instrument 121
Make temperature.Specifically, MCU103 can pass through communication bus, and (Inter-Integrated Circuit, collects such as IIC alternately
Becoming circuit) bus is connected with TEC control circuit 104, by sending parameter to TEC control circuit 104 or instruction controls TEC control
Circuit 104 regulates the operating temperature of laser instrument 121；Or, MCU103 passes through DAC output port and TEC control circuit 104 phase
Even, control TEC control circuit 104 and regulate the work of laser instrument 121 by exporting analog voltage amount to TEC control circuit 104
Temperature.
MCU103 is after the temperature value obtaining temperature sensor detection, and the temperature value according to prestoring sets with operating temperature
Corresponding relation between definite value, determines the operating temperature setting value corresponding to the temperature value of acquisition；And according to the work determined
Desired temperature, it is corresponding temperature that control TEC control circuit 104 regulates the operating temperature of laser instrument 121.
In actual applications, above-mentioned temperature sensor can be provided in optical module or be arranged at the housing of optical module
On, it is preferred that temperature sensor can be built in MCU103.In i.e. the optical module of the embodiment of the present invention can use and have
Put the MCU of temperature sensor.Described ambient temperature is commonly referred to as the case temperature of optical module.
For ease of describing, the temperature detected by temperature sensor being built in MCU herein is referred to as MCU temperature,
The operating temperature of laser instrument is referred to as laser temperature.Finding through experiment, it is corresponding that MCU temperature has certain with ambient temperature
Relation；Technical staff can detect the corresponding relation between MCU temperature and ambient temperature in advance；Such as, during actual test, ring
During border temperature-40 DEG C, MCU temperature is-13 DEG C；During ambient temperature+85 DEG C, MCU temperature is 110 DEG C.
Laser temperature can preset with the corresponding relation of MCU temperature.Such as, table 2 below show one concrete
Laser temperature and the mapping table of MCU temperature:
Table 2
Laser temperature regulates the work temperature of laser instrument 121 operating temperature with above-mentioned for controlling TEC control circuit 104
Degree setting value also has corresponding relation.
Thus, according to the corresponding relation between laser temperature and MCU temperature, and laser temperature sets with operating temperature
Corresponding relation between definite value, can obtain the corresponding relation between MCU temperature and operating temperature setting value；Technical staff is permissible
Being prestored in MCU103 by corresponding relation between MCU temperature and operating temperature setting value, MCU temperature sets with operating temperature
Corresponding relation between definite value specifically can be to be the form with function, or the form of form is saved in MCU103.Due to MCU
Temperature and ambient temperature have certain corresponding relation, say, that the height of MCU temperature also can reflect the height of ambient temperature
Low, therefore, MCU103 also can reflect ambient temperature at that time by the MCU temperature of built-in temperature sensor detection.So,
MCU103 can be after obtaining the temperature value of MCU temperature of temperature sensor detection, according to the temperature value prestored and work
Corresponding relation between desired temperature, determines the operating temperature setting value corresponding to the temperature value of acquisition；And according to determining
Operating temperature setting value, control TEC control circuit 104 regulating the operating temperature of laser instrument 121 is corresponding temperature.
So, when ambient temperature changes, MCU103 not necessarily controls the TEC control circuit 104 work by laser instrument 121
Temperature maintains in a stationary temperature value, but controls TEC control circuit 104 along with ambient temperature regulation laser instrument 121
Operating temperature；Owing to the operating temperature of laser instrument 121 there occurs change, then may affect the laser that laser instrument 121 is launched
Luminous power and extinction ratio；Therefore, the luminous power of laser instrument 121 can the most in the present invention, school in advance
Accurate in a specific reference optical power, such as, it is calibrated in the range of-1dBm～-0.5dBm；Such that make laser instrument
The operating temperature of 121 there occurs that change, its luminous power change the most therewith, but still can ensure that the mobility scale of luminous power exists
In the range of agreement regulation.
Such as, by above-mentioned method, it is in the range of-40 DEG C～+85 DEG C in ambient temperature, the change of laser temperature
Scope is 55 DEG C～67 DEG C；And under room temperature, the luminous power of laser instrument is set in advance in particular range-1dBm～-0.5dBm；This
Sample, when laser temperature changes in 55 DEG C～67 DEG C, the luminous power of laser instrument will change in-2.6dBm～-1.7dBm, and
This mobility scale meets 802.3ae protocol requirement and is applied to the luminous power requirement to laser instrument of the 10G Ethernet 40km optical module :-
4.7dBm～+4dBm.So, optical module both can have been saved power consumption for regulating laser temperature and (save heating or refrigeration
Power consumption), it is also possible to save the power consumption compensating voltage for the BIAS compensation electric current constant for guarantee luminous power and MOD；So that
Optical module has lower power consumption, in order to apply in the environment of a more wide temperature range (-40 DEG C～+85 DEG C), the most permissible
Apply in the environment of industrial temperature range.More preferably, the extinction ratio of laser instrument 121 also can be calibrated the most in a calibration process
In the range of a specific extinction ratio, such as, it is calibrated in the range of 6.5dB～7.5dB.Such that make laser instrument 121
Operating temperature there occurs that change, its extinction ratio change the most therewith, but still can ensure that the mobility scale of extinction ratio is in agreement
In the range of regulation.Such as, by above-mentioned method, it is in the range of-40 DEG C～+85 DEG C in ambient temperature, laser temperature
Excursion be 55 DEG C～67 DEG C；And under room temperature, the extinction ratio of laser instrument is set in advance in particular range 6.5dB～7.5dB
In；So, when laser temperature changes in 55 DEG C～67 DEG C, the extinction ratio of laser instrument will change in 6.4dB～8.6dB,
And this mobility scale meets 802.3ae protocol requirement and is applied to 10G Ethernet 40km optical module and requires the extinction ratio of laser instrument:
More than 3dB.So, optical module both can save the power consumption (saving heating or the power consumption of refrigeration) for regulating laser temperature,
Can also save for for ensureing that the BIAS that extinction ratio is constant compensates electric current, the power consumption of MOD compensation voltage；So that optical module tool
There is lower power consumption, in order to apply in the environment of a more wide temperature range (-40 DEG C～+85 DEG C), i.e. can apply in work
In the environment of industry temperature range.
More preferably, it is possible to the EA bias voltage calibration in a calibration process EA biasing circuit 105 exported in advance
Specific voltage range: EA bias voltage is arranged on the bigger magnitude of voltage ensureing passage cost index request, will EA inclined
Put voltage and be set to meet the maximum voltage value of passage cost index request.Such as, arranging EA bias voltage is-0.35V.This
Sample, same luminous power output can reduce BIAS electric current to ensure low-power consumption, with the power consumption of minimizing optical module further, simultaneously
Ensure to receive the eye diagram quality of signal.
Meanwhile, by above-mentioned method, it is in the range of-40 DEG C～+85 DEG C in ambient temperature, the change of laser temperature
Scope is 55 DEG C～67 DEG C；And under room temperature, the operating temperature of laser instrument is set to 60 DEG C.So, laser temperature is at 55 DEG C～67
In DEG C during change, the wavelength of laser instrument will change in 1534.02nm～1535.08nm, and this mobility scale meets 802.3ae
Protocol requirement is applied to the 10G Ethernet 40km optical module wavelength requirement to laser instrument: 1530nm～1565nm.Therefore, this side
Method is completely suitable for TDM optical module.
The how luminous power of correcting laser, extinction ratio, and the EA bias voltage of EA biasing circuit 105 output is ability
Technology known to field technique personnel, here is omitted.
It is true that above-mentioned drive circuit 122, EA biasing circuit 105, TEC control circuit 104 can be respectively adopted existing skill
Drive circuit conventional in art, EA biasing circuit, TEC control circuit.
Fig. 3 shows a kind of concrete TEC control circuit, including: voltage comparator circuit 301, voltage regulator circuit 302,
Bleeder circuit 303 and normal voltage output circuit 304.Fig. 4 shows voltage comparator circuit 301, voltage regulator circuit 302, mark
The physical circuit of quasi-voltage follower circuit 304.
Wherein, the thermocouple that bleeder circuit 303 is built-in with described laser instrument 121 is connected；Bleeder circuit 303 can be specifically
One resistance, the resistance thermocouple built-in with laser instrument 121 connect, and the normal voltage of 2.5V is loaded into resistance and thermocouple
On.
Normal voltage output circuit 304 outputting standard voltage is on the thermocouple of described bleeder circuit and series connection with it.
The normal voltage of normal voltage output circuit 304 output, can be such as 3.3V, or the DC voltage of 2.3V, concrete voltage
Value those skilled in the art can set according to practical situation.U8MAX8842 chip and peripheral cell thereof in Fig. 4 constitute
Normal voltage output circuit 304.U8MAX8842 chip is mu balanced circuit chip.6th pin of U8MAX8842 chip outputs
The normal voltage of 2.5V is loaded on bleeder circuit 303 and thermocouple.
One voltage input end of voltage comparator circuit 301, the thermocouple built-in with bleeder circuit 303 and laser instrument 121
Junction point be connected, such that it is able to the change of the voltage in the change of the voltage monitored on thermocouple, or bleeder circuit 303
Change.Owing to the resistance of thermocouple can change along with the change of temperature, the voltage on thermocouple also can change accordingly, equally,
Voltage on bleeder circuit 303 also can change accordingly；It is to say, the change of the voltage on bleeder circuit 303, or thermoelectricity
The change of the voltage in idol, reflects the change of temperature in laser instrument 121.
Another voltage input end of voltage comparator circuit 301 accesses MCU103 according to the operating temperature setting value determined
Voltage from the output of its DAC output port.
Voltage comparator circuit 301 compares the voltage of two voltage input ends, obtains both voltage differences, by voltage difference from it
Outfan exports.
U7NCS3001 chip in Fig. 4 and U5NCS3001 chip and peripheral cell thereof constitute voltage comparator circuit 301.
U7NCS3001 chip and U5NCS3001 chip are all comparator chip.One voltage of the voltage comparator circuit 301 in Fig. 4 is defeated
Entering the end voltage input pin 3 for U7NCS3001 chip, another voltage input end of this voltage comparator circuit 301 is
The voltage input pin 4 of U5NCS3001 chip, the outfan of this voltage comparator circuit 301 is that the voltage of U5NCS3001 chip is defeated
Go out pin 1.
The input of voltage regulator circuit 302 is connected with the outfan of voltage comparator circuit 301, its outfan and laser instrument
121 built-in TEC are connected；The voltage difference that voltage regulator circuit 302 exports according to voltage comparator circuit 301, regulates its outfan
Output is to the temperature regulation voltage of TEC.
Voltage regulator circuit 302 specifically can include that voltage-controlled PWM chip, i.e. voltage regulator circuit 302 are voltage-controlled PWM
(Pulse-Width Modulation, pulsewidth modulation) circuit.The input of voltage regulator circuit 302 is voltage-controlled PWM chip
The pin 10 of MAX8521 chip, the input of voltage regulator circuit 302, i.e. the pin 10 of U6MAX8521 chip with
The voltage output pin 1 of U5NCS3001 chip is connected, and voltage-controlled PWM chip MAX8521 chip is defeated according to voltage comparator circuit 301
The voltage gone out, carries out the pulsewidth modulation of PWM ripple, and the PWM ripple after modulation is from pin 18 He of voltage-controlled PWM chip MAX8521 chip
19 outputs；And the pin 18 and 19 of voltage-controlled PWM chip MAX8521 chip respectively with TEC-(the 1st pipe in Fig. 2 of laser instrument 121
Foot) it is connected with TEC+ (the 2nd pin in Fig. 2), thus the PWM ripple after modulation is exported the TEC of laser instrument.Added by control
The dutycycle of the PWM ripple being loaded on the TEC of laser instrument, it is possible to control heat release or the heat absorption of TEC, thus reach to control laser instrument
The purpose of interior temperature.
Such as, when laser instrument is heated up by needs, voltage regulator circuit 302 exports the bigger pulse of positive peak pulse duration and adjusts
Electric current processed；
When laser instrument is lowered the temperature by needs, voltage regulator circuit 302 exports the arteries and veins that less, the negative pulsewidth of positive pulsewidth is bigger
Modulated electric current.
Therefore, the voltage that TEC control circuit 104 can export from its DAC output port according to MCU103, regulation output is arrived
The voltage of the TEC that described laser instrument is built-in changes the temperature in laser instrument, i.e. reaches to regulate the mesh of the operating temperature of laser instrument
's.
Or, above-mentioned voltage regulator circuit 302, normal voltage output circuit 304 also can be integrated in the TEC of high integration
In control chip MAX8521.In MAX8521 sheet, FET decreases the number of outer member, and high switching frequency reduces outer member
Size, and work in single supply, between two synchronous converters output, connect TEC.This working method allows at low electricity
Realize during stream controlling without dead band and other nonlinear temperature.This strategy ensures in set-point closely environmental work point
Time, control system will not be vibrated, it is only necessary to a small amount of heating or cooling.
Further, the optical module of embodiments of the invention also includes: laser pick-off unit 102, power supply soft-start circuit,
DC-DC (DC-DC) power circuit, and ce circuit (not marking in figure).
Laser pick-off unit 102 its in order to the optical signal received according to optical module, be converted into the corresponding signal of telecommunication defeated
Go out, specifically can be converted into the digital differential signal of telecommunication and export from 20PIN electrical interface.The inside of laser pick-off unit 102 includes:
Amplitude limiting amplifier circuit and light-receiving assembly；Light-receiving assembly includes: photodiode and TIA (trans-impedance amplifier).It is preferred that
Photodiode can be selected for highly sensitive APD (Avalanche Photo Diode, avalanche photodide) or PIN
(Positive-intrinsic negative diode, positive-intrinsic-negative diode) detector.
Power supply soft-start circuit is connected with 20PIN electrical interface, receives 3.3V power supply and powers.Power supply soft-start circuit accepts confession
After electricity, to laser pick-off unit 102, laser emission element 101, MCU103, TEC control circuit 104, EA biasing circuit 105,
DC-DC power source circuit is powered.Power supply soft-start circuit is that optical module provides warm connection function.
DC-DC power source circuit receive power supply soft-start circuit power supply after, output low voltage 1.8V be drive circuit and
The kernel of amplitude limiting amplifier circuit is powered；And the port of drive circuit and amplitude limiting amplifier circuit is still supplied by power supply soft-start circuit
Electricity.Owing to core voltage is relatively low, outside DC-DC is used to substitute built-in LDO (Low Drop Out regulator, low voltage difference line
Property manostat), improve the efficiency of blood pressure lowering, thus reduce further the power consumption of optical module.
Ce circuit is connected with laser pick-off unit 102 or is built in laser pick-off unit 102, in order to be connect by laser
The signal of telecommunication of the limiting amplifier output receiving unit 102 carries out integer；
Or, ce circuit is connected with laser emission element 101 or is built in laser emission element 101, in order to laser
The signal of telecommunication that drive circuit in transmitter unit 101 receives carries out integer；
The MCU103 of the present invention also can control whether ce circuit bypasses, and on the premise of ensuring signal quality, MCU103 can
Control ce circuit bypass, to reduce the power consumption of optical module further.
The optical module of the present invention can be applicable to SDH (Synchronous Digital Hierarchy, the synchronous digital of 10G
Series) field such as Optical Transmission Network OTN, 10G/8G optical-fibre channel and 10G Ethernet；Such as, it is applied in SDH optical transmitter and receiver, or should
In GBE optical transmitter and receiver；Or it is applied in ONU (optical network unit), or is applied in OLT (optical line terminal).
Table 3 below show apply technical scheme two 10G 40km SFP+ optical modules (respectively 1#,
2# optical module) result of power consumption test that carries out in technical grade temperature range:
Table 3
From table 3 it can be seen that 1#, 2# optical module can meet maximum electricity in the operating temperature range of-5 DEG C～+70 DEG C
The stream low-power consumption requirement less than 450mA；Extend to simultaneously the maximum current of operating temperature range (-40 DEG C～+85 DEG C) again smaller than
550mA, maintains extremely low power consumption.
Table 4 below show apply technical scheme two 10G 40km SFP+ optical modules (respectively 1#,
2# optical module) result of performance test that carries out in technical grade temperature range:
Table 4
Table 4 it can be seen that in the technical grade temperature range of-40 DEG C～+85 DEG C luminous power and extinction ratio meet 802.3ae
Protocol requirement, low temperature and+85C high temperature eye pattern at-40C ensure the Ethernet template more than 20% simultaneously；Ensure that fabulous
Light emission performance.
The optical module of the embodiment of the present invention no longer maintains the operating temperature of laser instrument to be steady state value, but allows laser instrument
Operating temperature correspondingly changes with ambient temperature within the specific limits, thus without consumption within the scope of a wider temperature
Excessive heating or the power consumption of refrigeration；Further, in advance by suitable for the optical power calibration of laser instrument to scope so that light merit
Rate still can meet protocol requirement in the range of the temperature change of laser instrument, enters without to BIAS electric current or MOD voltage
Row compensates, and has further saved compensation power consumption so that optical module can apply in the environment of more wide temperature range；
Further, it is also possible in advance the extinction ratio of laser instrument is calibrated to a suitable scope so that extinction ratio is swashing
Still can meet protocol requirement in the range of the temperature change of light device, compensate without to BIAS electric current or MOD voltage,
Further save compensation power consumption so that optical module can apply in the environment of more wide temperature range；
Further, it is also possible in advance by suitable for EA bias voltage calibration to scope, such that it is able to further subtract
Little BIAS electric current is to ensure low-power consumption.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is permissible
Instructing relevant hardware by program to complete, this program can be stored in a computer read/write memory medium, such as:
ROM/RAM, magnetic disc, CD etc..
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. an optical module, including:
Laser emission element, it includes laser instrument and drive circuit；The extinction ratio calibration in advance of described laser instrument is to specific
In the range of extinction ratio；
Microprogram control unit MCU and TEC control circuit, described MCU is used for after the temperature value obtaining temperature sensor detection, root
According to the corresponding relation between the temperature value prestored and operating temperature setting value, determine the work corresponding to the temperature value of acquisition
Desired temperature；According to the operating temperature setting value determined, control described TEC control circuit and regulate the work of described laser instrument
Temperature is corresponding temperature.
2. optical module as claimed in claim 1, it is characterised in that described extinction ratio scope is particularly as follows: 6.5 dB ~ 7.5dB.
3. an operating temperature control method for optical module, including:
MCU in optical module is after the temperature value obtaining temperature sensor detection, according to the temperature value prestored and work temperature
Corresponding relation between degree setting value, determines the operating temperature setting value corresponding to the temperature value of acquisition；And
According to the operating temperature setting value determined, the operating temperature controlling TEC control circuit regulation laser instrument is corresponding temperature
Degree；
Wherein, the extinction ratio calibration in advance in described optical module is in the range of specific extinction ratio.
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Also Published As
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| CN103281132B (en) | 2016-09-07 |
| CN106253988B (en) | 2019-02-12 |
| CN103281132A (en) | 2013-09-04 |
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