CN106253988B - Optical module and its operating temperature adjusting method - Google Patents
Optical module and its operating temperature adjusting method Download PDFInfo
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- CN106253988B CN106253988B CN201610882321.8A CN201610882321A CN106253988B CN 106253988 B CN106253988 B CN 106253988B CN 201610882321 A CN201610882321 A CN 201610882321A CN 106253988 B CN106253988 B CN 106253988B
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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
Abstract
The invention discloses optical module and its operating temperature adjusting method, the optical module includes: laser emission element comprising laser and driving circuit；The extinction ratio of the laser is calibrated in advance within the scope of specific extinction ratio；MCU and TEC control circuit, the MCU are used for after the temperature value for obtaining temperature sensor detection, determine operating temperature setting value corresponding to the temperature value obtained；According to the operating temperature setting value determined, controlling TEC control circuit and adjusting the operating temperature of laser is corresponding temperature.Due to allowing the operating temperature of laser in a certain range with environment temperature corresponding change, to save the power consumption of heating or refrigeration；Also, extinction ratio is calibrated to a suitable range in advance, so that extinction ratio can still be met the requirements within the scope of the temperature change of laser, without compensating to BIAS electric current, has further saved compensation power consumption.
Description
Technical field
This case is that on May 24th, 2013 submitting, application No. is 201310196860.2, patent names for applied to width
The divisional application of optical module and its operating temperature adjusting method in temperature range.
The present invention relates to Fibre Optical Communication Technology more particularly to a kind of optical modules and its work applied in wide temperature range
Temperature control method.
Background technique
In recent years, with the fast development of enhanced 8.5G optical-fibre channel and 10G Ethernet high speed optical networks agreement, to super
The demand of high rate optical transceiver module increasingly increases, while the requirement to module port density and power consumption is also higher and higher.
10Gbit/s optical transceiver module in the past few years, experienced 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.Upgrading of the SFP+ optical module as SFP (small form-factor pluggables, small pluggable) optical module
Version meets IEEE 802.3AE/AQ and 8G/10G fiber channel protocol specification, and module size reduces 40% compared with XFP, tool
There are higher port density and lower power consumption, transmission range also increases to 10km, 40km and 80km from 300m.
SFP+ optical module in the prior art needs smaller using being lost in (such as 40km and 80km) transmission over long distances
Window wavelength carry out transmission just can guarantee communications receiving sensitivity requirement, generally using 1550nm single mode optical fiber progress
Transmission.Directly modulation can generate serious laser chip phenomenon simultaneously, and (bias current of laser is by signal modulation, optical frequency hair
Raw offset and shake).Chirp can generate serious distortion.This distortion, with transmission range, transmission bandwidth and channel number
Increase and becomes very serious.In summary factor, long range SFP+ generally use the externally modulated laser of 1550nm, such as make
With more universal EML (Electroabsorption Modulated Laser, electro-absorption modulation are radium-shine) laser.EML laser
The characteristic of device can have greatly changed with the variation of operating temperature, so that the generation of the parameters such as the power of optical signal, wavelength is very big
Variation, eye diagram quality also becomes very poor；Signal quality after being transmitted by optical fiber also can be very poor, and the bit error rate becomes larger to shadow
Ring the q&r of communication.Quality to guarantee optical signal under normal conditions, it is necessary to keep EML laser to emit sharp
The optical power and extinction ratio of light are constant, and the variation of the wavelength of laser is no more than scheduled range；Thus, it is desirable to keep EML laser
The operating temperature of device it is constant.
In the prior art, the SFP+ optical module for needing to carry out long distance transmission is as shown in Figure 1a, generallys use and is built-in with TEC
Laser, such as EML laser.TEC (Thermoelectric cooler, thermoelectric cooler) control circuit in optical module
For keeping the temperature in laser constant, that is, keep the working temperature constant of laser.Specifically, it is also built-in in laser
Thermocouple, with the change of temperature, the resistance value of thermocouple also can accordingly change；TEC control circuit passes through built in detection laser
Thermocouple resistance value, the TEC that closed loop adjusts built in laser is heated or is freezed, so that temperature in laser keeps permanent
It is fixed.
However, in 70 DEG C or more of hot environment or -5 DEG C of low temperature environments below, if using above-mentioned heating or
The method of refrigeration keeps constant the temperature in laser, then needs to consume biggish electric current；Due to needing to consume biggish electricity
Stream, the power consumption and heat dissipation performance of this SFP+ optical module high to small in size, component density propose the requirement being difficult to realize；Following table
1 shows under different temperatures environment, the limitation of maximum current consumed to optical module:
Table 1
| Temperature range | Maximum current |
| - 5C~+70C (business level) | <450mA |
| - 40C~+85C (technical grade) | <570mA |
Therefore, using the long range SFP+ optical module of the above-mentioned constant technology of holding laser temperature in broader temperature range
When work, such as technical grade temperature (- 40 DEG C~+85 DEG C), in 70 DEG C or more of hot environment or -5 DEG C of low temperature environments below
When work, the TEC electric current for being heated and being freezed to EML TOSA is more than the limit of TEC functional circuit inside optical module,
Lead to TEC circuit operational failure, EML TOSA operating temperature no longer maintains target temperature constant, works and loses so as to cause optical module
Effect, more very in the case of can damage EML TOSA.
To solve the above problems, the patent of Publication No. 102970080A discloses a kind of optical module and its laser works
The adjusting method of temperature, it is steady state value that this method, which no longer maintains the operating temperature of laser, but allows the work temperature of laser
Degree correspondingly changes with environment temperature in a certain range；Meanwhile using adjusting BIAS (biasing) electric current as compensatory device, into
One step, which also can be used, adjusts MOD (modulation) voltage or EA (Electro-Absorption, electric absorption) voltage as compensation hand
Section, so that the optical power and extinction ratio of the laser of laser transmitting are constant.Due to allowing the operating temperature of laser with environment temperature
Degree has corresponding change, reduces the difference between the operating temperature of laser and environment temperature；In this way, even if at 70 DEG C or more
Hot environment or -5 DEG C of low temperature environments below in, be also not necessarily the TEC built in laser and excessive heating or refrigeration be provided
Electric current, so that the long range SFP+ optical module using this technology can be applied within the scope of wider temperature.
However, in practical applications, it was found by the inventors of the present invention that when being compensated to BIAS electric current or MOD voltage, still
Certain power consumption can so be consumed；Especially in the high temperature environment, in order to compensate to BIAS electric current, need to increase BIAS electricity
Stream, this make under hot environment because BIAS compensate electric current due to cause power consumption to increase, cause optical module shell calorific value it is larger, heat dissipation
Difficulty, occur device because temperature is excessively high fail the phenomenon that.It can therefore, it is necessary to provide that a kind of lower optical module of power consumption is 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 applied in wide temperature range and its operating temperature adjusting sides
Method, the power consumption to reduce optical module are allowed in the environment that can be applied to more wide temperature range.
According to an aspect of the invention, there is provided a kind of optical module applied in wide temperature range, comprising:
Laser emission element comprising laser and driving circuit；The extinction ratio of the laser is calibrated to spy in advance
Within the scope of fixed extinction ratio；
Microprogram control unit MCU and TEC control circuit, the MCU are used in the temperature value for obtaining temperature sensor detection
Afterwards, the corresponding relationship between temperature value according to the pre-stored data and operating temperature setting value determines corresponding to the temperature value obtained
Operating temperature setting value；According to the operating temperature setting value determined, controls the TEC control circuit and adjust the laser
Operating temperature be corresponding temperature.
According to another aspect of the present invention, a kind of operating temperature adjusting method of optical module is provided, comprising:
MCU in optical module is after the temperature value for obtaining temperature sensor detection, temperature value according to the pre-stored data and work
Make the corresponding relationship between desired temperature, determines operating temperature setting value corresponding to the temperature value obtained；And
According to the operating temperature setting value determined, the work temperature that the TEC control circuit adjusts the laser is controlled
Degree is corresponding temperature；
Wherein, the extinction ratio of the laser in the optical module is calibrated in advance within the scope of specific extinction ratio.
It is steady state value that the optical module of the embodiment of the present invention, which no longer maintains the operating temperature of laser, but allows laser
Operating temperature correspondingly changes with environment temperature in a certain range, thus without consumption within the scope of a wider temperature
The power consumption of excessive heating or refrigeration；Also, the extinction ratio of laser is calibrated to a suitable range in advance, so that delustring
Than still can satisfy protocol requirement within the scope of the temperature change of laser, without to BIAS electric current or MOD voltage into
Row compensation.
Detailed description of the invention
Fig. 1 a is the partial circuit schematic diagram in the optical module of the 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 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.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, referring to the drawings and preferred reality is enumerated
Example is applied, the present invention is described in more detail.However, it is necessary to illustrate, many details listed in specification are only to be
Reader is set to have a thorough explanation to one or more aspects of the present invention, it can also be with even without these specific details
Realize the aspects of the invention.
The terms such as " module " used in this application, " system " be intended to include with computer-related entity, such as it is but unlimited
In hardware, firmware, combination thereof, software or software in execution.For example, module can be, and it is not limited to: processing
Process, processor, object, executable program, the thread of execution, program and/or the computer run on device.
The optical power of optical module, extinction ratio it is considered that can be calibrated to one suitably by the present inventor in advance
In range；It is put into optical module in application, no longer maintaining the operating temperature of laser is steady state value, but allows laser
Operating temperature correspondingly changes with environment temperature in a certain range；Meanwhile also no longer BIAS electric current, MOD voltage are mended
It repays.Although the operating temperature of laser changes in a certain range, correspondingly, the wavelength of laser, optical power, extinction ratio
It can be changed in a certain range with the operating temperature of laser；But since optical power, extinction ratio being calibrated in advance in advance
In the range suitable to one；In this way, can have centainly with the operating temperature of laser the optical power of laser, extinction ratio
Variation, but mobility scale can be allowed within the scope of agreement specification.Therefore, without being compensated to BIAS electric current, MOD voltage
Wavelength within the scope of agreement specification, optical power, extinction ratio can also be obtained in a wide temperature range.Therefore, this hair
Bright method compensates BIAS electric current due to not having to, and further reduced the power consumption of optical module；Especially under high temperature environment,
Without increasing to the compensation electric current of BIAS electric current, so that it may avoid TEC circuit from working in high temperature or low temperature actual effect, more conducively
The application of optical module in the high temperature environment.
The technical solution for embodiment that the invention will now be described in detail with reference to the accompanying drawings.It is provided in an embodiment of the present invention to be applied to width
The internal circuit of optical module in temperature range is as shown in Figure 1 b, comprising: laser emission element 101, MCU
(Microprogrammed Control Unit, microprogram control unit) 103, TEC control circuit 104, EA biasing circuit 105.
Laser emission element 101 is to emit optical signal according to the received electric signal of optical module；For example, if optical module is specific
For the optical module in Ethernet optical transmitter and receiver, then laser emission element 101 receives the number that the interchanger in Ethernet optical transmitter and receiver is sent
Word differential electric signal, and digital differential electric signal emits corresponding optical signal based on the received.
It include: laser 121 and its driving circuit 122 in laser emission element 101.The driving of laser emission element 101
Circuit 122 is believed according to the light of the laser light emitting light source transmitting specific wavelength in the received electric signal driving laser 121 of optical module
Number.I.e. driving circuit 122 is according to the laser light emitting light source in the received digital differential electric signal driving laser 121 of optical module
The optical signal of (LD in Fig. 2) transmitting specific wavelength.Specifically, driving circuit 122 is connected with 20PIN (pin) electrical interface, light
Module by 20PIN electrical interface with except optical module circuit or equipment be connected.Driving circuit 122 is received by electrical interface
After digital differential electric signal, modulated signal is obtained after CDR (clock and data recovery) device, the equilibrium etc. that can be bypassed are handled,
And modulated signal is sent to laser 121, the optical signal for exporting to laser 121 is modulated.Driving circuit 122 is
Laser 121 provides BIAS electric current and modulated signal, to drive the light of laser light emitting light source (LD in Fig. 2) transmitting specific wavelength
Signal.Wherein, the BIAS electric current that driving circuit 122 exports and MOD (modulation) voltage of modulated signal are controlled by MCU103
Setting.
Preferably, the EML laser or CML laser of high efficiency, low-power consumption can be selected in laser 121.
EA biasing circuit 105 is to provide EA bias voltage for laser 121.EA biasing circuit 105 is usually by driving by force
The operational amplifier and charge pump voltage reversal device (Charge Pump Voltage Inverters) of ability are constituted, will
MCU103 passes through the positive voltage that DAC (Digital-to-Analog Converter, digital analog converter) output port exports
It is converted into negative voltage and exports to do negative pressure biasing to driving circuit 122.That is, MCU103 can control EA biasing circuit 105
The EA bias voltage of output.
MCU103 is connected with driving circuit 122, can control the BIAS electric current and MOD voltage of the output of driving circuit 122
Size.For example, MCU103 is connected with driving circuit 122 by iic bus, MCU103 passes through iic bus to driving circuit 122
BIAS current setting value is sent, the BIAS current setting value based on the received of driving circuit 122 exports BIAS electricity of corresponding size
Stream；MCU103 sends MOD voltage setting value to driving circuit 122 by iic bus, and MOD is electric based on the received for driving circuit 122
Setting value is pressed, MOD voltage of corresponding size is exported.For another example, MCU103 can also be exported by DAC output port corresponding voltage come
Control BIAS electric current and MOD voltage that driving circuit 122 exports.
As shown in Fig. 2, built-in thermocouple and TEC in laser 121.TEC control circuit 104 specifically with laser 121
In thermocouple be connected with TEC, to adjust the temperature in laser 121, that is, adjust the operating temperature of laser 121.
MCU103 is connected with TEC control circuit 104, can control the work that TEC control circuit 104 adjusts laser 121
Make temperature.Specifically, MCU103 can pass through communication bus, such as IIC (Inter-Integrated Circuit, interaction collection
At circuit) bus is connected with TEC control circuit 104, by sending parameter or instruction control TEC control to TEC control circuit 104
The operating temperature of the adjusting laser 121 of circuit 104；Alternatively, MCU103 passes through DAC output port and 104 phase of TEC control circuit
Even, the work that TEC control circuit 104 adjusts laser 121 is controlled by exporting analog voltage amount to TEC control circuit 104
Temperature.
After the temperature value for obtaining temperature sensor detection, temperature value according to the pre-stored data is set MCU103 with operating temperature
Corresponding relationship between definite value determines operating temperature setting value corresponding to the temperature value obtained；And according to the work determined
Desired temperature, the operating temperature that control TEC control circuit 104 adjusts laser 121 is corresponding temperature.
In practical applications, above-mentioned temperature sensor can be the shell for being arranged in optical module or being set to optical module
On, it is built in MCU103 preferably, temperature sensor can be.That is the optical module of the embodiment of the present invention can be used with interior
Set the MCU of temperature sensor.The environment temperature is commonly referred to as the case temperature of optical module.
For ease of description, temperature detected by the temperature sensor being built in MCU is known as MCU temperature herein,
The operating temperature of laser is referred to as laser temperature.It is discovered by experiment that MCU temperature has certain corresponding with environment temperature
Relationship；Technical staff can detect the corresponding relationship between MCU temperature and environment temperature in advance；For example, when actual test, ring
MCU temperature is -13 DEG C at -40 DEG C of border temperature；MCU temperature is 110 DEG C at+85 DEG C of environment temperature.
The corresponding relationship of laser temperature and MCU temperature can be preset.For example, the following table 2 shows one specifically
The mapping table of laser temperature and MCU temperature:
Table 2
Laser temperature and the above-mentioned work temperature that 121 operating temperature of laser is adjusted for controlling TEC control circuit 104
Degree setting value also has corresponding relationship.
As a result, according between laser temperature and MCU temperature corresponding relationship and laser temperature set with operating temperature
Corresponding relationship between definite value, the corresponding relationship between available MCU temperature and operating temperature setting value；Technical staff can be with
Corresponding relationship between MCU temperature and operating temperature setting value is prestored in MCU103, MCU temperature is set with operating temperature
Corresponding relationship between definite value specifically can be to be stored in MCU103 in the form of function or in the form of table.Due to MCU
Temperature and environment temperature have certain corresponding relationship, that is to say, that the height of MCU temperature can also reflect the height of environment temperature
Low, therefore, MCU103 can also reflect environment temperature at that time by the MCU temperature that built-in temperature sensor detects.In this way,
MCU103 can be after obtaining the temperature value of MCU temperature of temperature sensor detection, temperature value according to the pre-stored data and work
Corresponding relationship between desired temperature determines operating temperature setting value corresponding to the temperature value obtained；And according to determining
Operating temperature setting value, control TEC control circuit 104 adjust laser 121 operating temperature be corresponding temperature.
In this way, MCU103 not necessarily controls TEC control circuit 104 for the work of laser 121 when environment temperature changes
Temperature maintains in a stationary temperature value, but controls TEC control circuit 104 as environment temperature adjusts laser 121
Operating temperature；Since the operating temperature of laser 121 is changed, then it may will affect the laser of the transmitting of laser 121
Optical power and extinction ratio；Therefore, the optical power of laser 121 can in advance in a calibration process in the present invention, preparatory school
In standard to a specific reference optical power, for example, being calibrated in the range of -1dBm~-0.5dBm；In this way, even if laser
Change has occurred in 121 operating temperature, its optical power also changes correspondingly, but still can guarantee that the mobility scale of optical power exists
In the range of agreement regulation.
For example, by above-mentioned method, in the range of environment temperature is -40 DEG C~+85 DEG C, the variation of laser temperature
Range is 55 DEG C~67 DEG C；And under room temperature, the optical power of laser is set in advance in particular range -1dBm~-0.5dBm；This
Sample, when laser temperature changes in 55 DEG C~67 DEG C, the optical power of laser will change in -2.6dBm~-1.7dBm, and
The mobility scale meets optical power requirement of the 802.3ae protocol requirement applied to 10G Ethernet 40km optical module to laser :-
4.7dBm~+4dBm.In this way, optical module can both save for adjusting laser temperature power consumption (save heating or refrigeration
Power consumption), it can also save for the power consumption to guarantee optical power constant BIAS compensation electric current and MOD offset voltage；To make
Optical module has lower power consumption, to apply in the environment of a more wide temperature range (- 40 DEG C~+85 DEG C), it can
It applies in the environment of industrial temperature range.More preferably, the extinction ratio of laser 121 can also calibrate in advance in a calibration process
Into a specific extinction ratio, for example, being calibrated in the range of 6.5dB~7.5dB.In this way, even if laser 121
Change has occurred in operating temperature, its extinction ratio also changes correspondingly, but the mobility scale of extinction ratio still can be guaranteed in agreement
In the range of regulation.For example, by above-mentioned method, in the range of environment temperature is -40 DEG C~+85 DEG C, laser temperature
Variation range be 55 DEG C~67 DEG C；And under room temperature, the extinction ratio of laser is set in advance in particular range 6.5dB~7.5dB
In；In this way, the extinction ratio of laser will change in 6.4dB~8.6dB when laser temperature changes in 55 DEG C~67 DEG C,
And the mobility scale meets extinction ratio requirement of the 802.3ae protocol requirement applied to 10G Ethernet 40km optical module to laser:
Greater than 3dB.In this way, optical module can both save the power consumption (power consumption for saving heating or refrigeration) for adjusting laser temperature,
It can also save for the power consumption to guarantee the constant BIAS compensation electric current of extinction ratio, MOD offset voltage；To make optical module have
There is lower power consumption, to apply in the environment of a more wide temperature range (- 40 DEG C~+85 DEG C), it can apply in work
In the environment of industry temperature range.
More preferably, the EA bias voltage calibration that can also in advance in a calibration process export EA biasing circuit 105 is to one
Specific voltage range: EA bias voltage is arranged on the larger voltage value for guaranteeing channel cost index request, i.e., EA is inclined
Voltage is set to be set as meeting the maximum voltage value of channel cost index request.For example, setting EA bias voltage is -0.35V.This
Sample, same optical power output can reduce BIAS electric current to guarantee low-power consumption, to be further reduced the power consumption of optical module, simultaneously
Guarantee the eye diagram quality of reception signal.
Meanwhile passing through above-mentioned method, in the range of environment temperature is -40 DEG C~+85 DEG C, the variation of laser temperature
Range is 55 DEG C~67 DEG C；And under room temperature, the operating temperature of laser is set as 60 DEG C.In this way, laser temperature is 55 DEG C~67
When changing in DEG C, the wavelength of laser will change in 1534.02nm~1535.08nm, and the mobility scale meets 802.3ae
Protocol requirement is applied to 10G Ethernet 40km optical module to the wavelength requirement of laser: 1530nm~1565nm.Therefore, this side
Method is completely suitable for TDM optical module.
How the EA bias voltage that optical power, extinction ratio and the EA biasing circuit 105 of correcting laser export is ability
Technology known to field technique personnel, details are not described herein again.
In fact, existing skill can be respectively adopted in above-mentioned driving circuit 122, EA biasing circuit 105, TEC control circuit 104
Common driving circuit, EA biasing circuit, TEC control circuit in art.
Fig. 3 shows a kind of specific TEC control circuit, comprising: 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, bleeder circuit 303 is connected with the thermocouple built in the laser 121；Bleeder circuit 303 specifically can be
One resistance, resistance are connected with the thermocouple built in laser 121, and the normal voltage of 2.5V is loaded into resistance and thermocouple
On.
On normal voltage output circuit 304 outputting standard voltage to the bleeder circuit and the thermocouple of series connection with it.
The normal voltage that normal voltage output circuit 304 exports, for example can be the DC voltage of 3.3V or 2.3V, specific voltage
Value those skilled in the art can set according to the actual situation.U8MAX8842 chip and its peripheral cell in Fig. 4 constitute
Normal voltage output circuit 304.U8MAX8842 chip is 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, with the thermocouple built in bleeder circuit 303 and laser 121
Tie point be connected, the change of the voltage in variation or bleeder circuit 303 so as to monitor the voltage on thermocouple
Change.Since the resistance value of thermocouple can change with the change of temperature, the voltage on thermocouple also can accordingly change, equally,
Voltage on bleeder circuit 303 also can accordingly change；That is, variation or the thermoelectricity of the voltage on bleeder circuit 303
The variation of voltage in idol reflects the variation of the temperature in laser 121.
Another voltage input end access MCU103 of voltage comparator circuit 301 is according to the operating temperature setting value determined
The voltage exported from its DAC output port.
Voltage comparator circuit 301 compares the voltage of two voltage input ends, the voltage difference both obtained, by voltage difference from its
Output end output.
U7NCS3001 chip and U5NCS3001 chip and its peripheral cell in Fig. 4 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
Enter the voltage input pin 3 that end is U7NCS3001 chip, another voltage input end of the voltage comparator circuit 301 is
The voltage input pin 4 of U5NCS3001 chip, the output end of the voltage comparator circuit 301 are that the voltage of U5NCS3001 chip is defeated
Pin 1 out.
The input terminal of voltage regulator circuit 302 is connected with the output end of voltage comparator circuit 301, output end and laser
TEC built in 121 is connected；The voltage difference that voltage regulator circuit 302 is exported according to voltage comparator circuit 301, adjusts its output end
The temperature for being output to TEC adjusts voltage.
Voltage regulator circuit 302 can specifically include voltage-controlled PWM chip, i.e. voltage regulator circuit 302 is voltage-controlled PWM
(Pulse-Width Modulation, pulsewidth modulation) circuit.The input terminal of voltage regulator circuit 302 is voltage-controlled PWM chip
The pin 10 of MAX8521 chip, the input terminal of voltage regulator circuit 302, the i.e. 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
Voltage out carries out the pulsewidth modulation of PWM wave, pin 18 He of the modulated PWM wave from voltage-controlled PWM chip MAX8521 chip
19 outputs；And the pin 18 and 19 of voltage-controlled PWM chip MAX8521 chip respectively with the TEC- of laser 121 (in Fig. 2 the 1st pipe
Foot) it is connected with TEC+ (the 2nd pin in Fig. 2), so that modulated PWM wave to be output to the TEC of laser.Added by control
It is loaded in the duty ratio of the PWM wave on the TEC of laser, so that it may the heat release or heat absorption of TEC are controlled, to reach control laser
The purpose of interior temperature.
For example, voltage regulator circuit 302 exports the biggish pulse tune of positive peak pulse duration when needing to heat up to laser
Electric current processed；
When needing to cool down to laser, voltage regulator circuit 302 exports that positive pulsewidth is smaller, the negative biggish arteries and veins of pulsewidth
Modulated electric current.
Therefore, the voltage that TEC control circuit 104 can be exported according to MCU103 from its DAC output port, adjusting are output to
The voltage of TEC built in the laser changes the temperature in laser, that is, reaches the mesh for adjusting the operating temperature of laser
's.
Alternatively, above-mentioned voltage regulator circuit 302, normal voltage output circuit 304 can also be integrated in the TEC of high integration
It controls in chip MAX8521.FET reduces the number of outer member in MAX8521 piece, and high switching frequency reduces outer member
Size, and work in single supply, connect TEC between two synchronous converters outputs.This working method allows in low electricity
It is realized when stream without dead zone and other nonlinear temperature controls.This strategy guarantees in set-point very close to environmental work point
When, control system will not vibrate, it is only necessary to a small amount of heating or cooling.
Further, the optical module of the embodiment of the present invention further include: laser pick-off unit 102, power supply soft-start circuit,
DC-DC (DC to DC) power circuit and ce circuit (not marked in figure).
Laser pick-off unit 102 its it is defeated to be converted into corresponding electric signal according to the received optical signal of optical module
Out, digital differential electric signal can be specifically converted into export from 20PIN electrical interface.The inside of laser pick-off unit 102 includes:
Amplitude limiting amplifier circuit and light-receiving component；It include: photodiode and TIA (trans-impedance amplifier) in light-receiving component.Preferably,
The APD (Avalanche Photo Diode, avalanche photodide) or PIN of high sensitivity can be selected in photodiode
(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 power supply.Power supply soft-start circuit receives confession
After electricity, to laser pick-off unit 102, laser emission element 101, MCU103, TEC control circuit 104, EA biasing circuit 105,
The power supply of DC-DC power source circuit.Power supply soft-start circuit provides warm connection function for optical module.
DC-DC power source circuit receive power supply soft-start circuit power supply after, output lower voltage 1.8V be driving circuit and
The kernel of amplitude limiting amplifier circuit is powered；And the port of driving circuit and amplitude limiting amplifier circuit is still supplied by power supply soft-start circuit
Electricity.Since core voltage is lower, built-in LDO (Low Drop Out regulator, low voltage difference line are substituted using external DC-DC
Property voltage-stablizer), the efficiency of decompression is improved, to further reduced the power consumption of optical module.
Ce circuit is connected or is built in laser pick-off unit 102 with laser pick-off unit 102, to connect laser
The electric signal for receiving the limiting amplifier output of unit 102 carries out integer；
Alternatively, ce circuit is connected or is built in laser emission element 101 with laser emission element 101, to laser
The received electric signal of driving circuit in transmitting unit 101 carries out integer；
Whether the also controllable ce circuit of MCU103 of the invention bypasses, and MCU103 can under the premise of ensuring signal quality
Ce circuit bypass is controlled, to further decrease the power consumption of optical module.
Optical module of the invention can be applied to SDH (Synchronous Digital Hierarchy, the synchronous digital of 10G
Series) fields such as Optical Transmission Network OTN, 10G/8G optical-fibre channel and 10G Ethernet；For example, being applied in SDH optical transmitter and receiver, Huo Zheying
For in GBE optical transmitter and receiver；Perhaps it is applied in ONU (optical network unit) or is applied in OLT (optical line terminal).
The following table 3 show apply technical solution of the present invention two 10G 40km SFP+ optical modules (respectively 1#,
2# optical module) result of power consumption test that is carried out in technical grade temperature range:
Table 3
From table 3 it can be seen that 1#, 2# optical module can satisfy maximum electricity in -5 DEG C~+70 DEG C of operating temperature range
Low-power consumption requirement of the stream 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.
The following table 4 show apply technical solution of the present invention two 10G 40km SFP+ optical modules (respectively 1#,
2# optical module) result of performance test that is carried out in technical grade temperature range:
Table 4
Table 4 is as can be seen that optical power and extinction ratio meet 802.3ae in -40 DEG C~+85 DEG C of technical grade temperature range
Protocol requirement, while guaranteeing the ether net stencil greater than 20% in the low temperature of -40C and+85C high temperature eye figure；It ensure that fabulous
Light emitting performance.
It is steady state value that the optical module of the embodiment of the present invention, which no longer maintains the operating temperature of laser, but allows laser
Operating temperature correspondingly changes with environment temperature in a certain range, thus without consumption within the scope of a wider temperature
The power consumption of excessive heating or refrigeration；Also, in advance by the optical power calibration of laser to a suitable range, so that light function
Rate still can satisfy protocol requirement within the scope of the temperature change of laser, without to BIAS electric current or MOD voltage into
Row compensation, has further saved compensation power consumption, so that optical module can be applied in the environment of more wide temperature range；
It further, can be the extinction ratio of laser be calibrated to a suitable range in advance, so that extinction ratio is swashing
It still can satisfy protocol requirement within the scope of the temperature change of light device, without being compensated to BIAS electric current or MOD voltage,
Compensation power consumption further is saved, so that optical module can be applied in the environment of more wide temperature range；
It further, can be in advance by EA bias voltage calibration to a suitable range, so as to further subtract
Small BIAS electric current is to guarantee low-power consumption.
Those of ordinary skill in the art will appreciate that implement the method for the above embodiments be can be with
Relevant hardware is instructed to complete by program, which can be stored in a computer readable storage medium, such as:
ROM/RAM, magnetic disk, CD etc..
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of optical module, comprising:
Laser emission element comprising laser and driving circuit；The extinction ratio of the laser is calibrated to specifically in advance
Within the scope of extinction ratio；
Microprogram control unit MCU and TEC control circuit, the MCU are used for after the temperature value for obtaining temperature sensor detection, root
According to the corresponding relationship between pre-stored temperature value and operating temperature setting value, work corresponding to the temperature value obtained is determined
Desired temperature；According to the operating temperature setting value determined, the work that the TEC control circuit adjusts the laser is controlled
Temperature is corresponding temperature.
2. optical module as described in claim 1, which is characterized in that the extinction ratio range specifically: 6.5 dB ~ 7.5dB.
3. a kind of operating temperature adjusting method of optical module, comprising:
MCU in optical module is after the temperature value for obtaining temperature sensor detection, temperature value according to the pre-stored data and work temperature
The corresponding relationship between setting value is spent, determines operating temperature setting value corresponding to the temperature value obtained；And
According to the operating temperature setting value determined, controlling TEC control circuit and adjusting the operating temperature of laser is corresponding temperature
Degree；
Wherein, the extinction ratio in the optical module is calibrated in advance within the scope of specific extinction ratio.
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| CN103281132B (en) | 2016-09-07 |
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