CN103036144A - Transmitter Optical Subassembly (TOSA) outer heating device and control circuit - Google Patents
Transmitter Optical Subassembly (TOSA) outer heating device and control circuit Download PDFInfo
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- CN103036144A CN103036144A CN2012105810773A CN201210581077A CN103036144A CN 103036144 A CN103036144 A CN 103036144A CN 2012105810773 A CN2012105810773 A CN 2012105810773A CN 201210581077 A CN201210581077 A CN 201210581077A CN 103036144 A CN103036144 A CN 103036144A
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Abstract
The invention discloses a Transmitter Optical Subassembly (TOSA) outer heating device and a control circuit. The TOSA outer heating device and the control circuit comprise a current source circuit main board with temperature control which is used for providing an electric current for a TOSA outer heating Printed circuit board (PCB) and controls the magnitude of the electric current, the TOSA outer heating PCB board which is used for conducting outer heating on the TOSA and a flexible printed circuit board ( a flexible board in short) which is used for connecting the current source circuit main board with temperature control and the TOSA outer heating PCB board. The TOSA outer heating PCB board is connected to a TOSA to heat the TOSA. The current source circuit main board with temperature control provides the electric current for the TOSA outer heating board through the flexible board and adjusts the magnitude of the electric current according to the change of temperature. The electric current flows through a TOSA outer heating PCB board heating resistor to cause the heating of the heating board to conduct temperature compensation on the TOSA. The invention provides the TOSA outer heating device and the control circuit. The temperature compensation is conducted on the TOSA, and the laser wavelength shift which changes with the temperature is kept in an permitted scope.
Description
Technical field
The present invention relates to a kind of circuit that TOSA is carried out external heat.
Background technology
Light emission secondary module TOSA(Transmitter Optical Subassembly) be the core component of optical communication, it is the assembly that LD laser integration packaging is become, comprise LD laser part, several parts such as coupling unit and external optical interface form, and are the key components of used optical transceiver module in the optical communication.
CWDM is a kind of low-cost WDM transmission technology towards the metropolitan area network Access Layer.On principle, CWDM utilizes optical multiplexer that different wave length signal multiplexing to simple optical fiber is transmitted exactly, at the receiving terminal of link, the mixed signal in the optical fiber is decomposed into the signal of different wave length by optical demultiplexer, be connected to corresponding receiving equipment.
Because there is requirement the wavelength interval of CWDM system, but not the common wavelength of cooling laser is 0.1nm/ ℃ with temperature drift, and the CWDM system allows-6.5 ℃～+ 6.5 ℃ of maximum wavelength skews, in the operating temperature range (5 ℃～70 ℃) of commercial shelves, still in permissible range, laser need not temperature control mechanism to the wave length shift that variations in temperature causes; And in the operating temperature range (40 ℃～85 ℃) of industry shelves, the wave length shift that variations in temperature causes might exceed the signal cross-talk that the scope of allowing causes channel, when low temperature, laser need to heat and carry out temperature-compensating, so that the wave length shift of laser remains in the scope of allowing.
Summary of the invention
The object of the invention is to overcome existing above-mentioned deficiency in the prior art, a kind of TOSA external heating device and control circuit are provided, TOSA is carried out temperature-compensating, so that the temperature variant wave length shift of laser remains in the scope of allowing, in order to realize the foregoing invention purpose, the invention provides following technical scheme:
A kind of TOSA external heating device and control circuit, comprise for electric current is provided to TOSA external heat pcb board and with temperature controlled current source circuit mainboard, be used for carrying out the TOSA external heat pcb board of external heat and being used for the flexible board of the temperature controlled current source circuit mainboard of connecting band and TOSA external heat pcb board to TOSA; Be with temperature controlled current source circuit mainboard to be connected with TOSA external heat pcb board by flexible board; TOSA external heat pcb board is connected to TOSA with heating TOSA;
Be with temperature controlled current source circuit mainboard electric current to be provided and to control size of current to TOSA external heat pcb board by flexible board, flow through TOSA external heat pcb board heating of electric current causes that the heating plate heating is to carry out temperature-compensating to TOSA.
When TOSA is in lower temperature, provide constant DC current source with heating TOSA with temperature controlled current source circuit mainboard for TOSA external heat pcb board.
In being with temperature controlled current source circuit mainboard, export from P channel mosfet transistor in Constant Direct Current electric current source, realizes control to current source output current size with the voltage of the G utmost point of the comparison circuit output voltage control MOSFET pipe of thermistor.Under different temperature environments, the output of thermistor control comparator, along with can realizing the comparator output voltage, the rising of temperature reduces, thereby the output size of control current source, thereby realize that TOSA output current intensity under low temperature environment is large, and under TOSA was in hot environment, the current strength of output was little even do not have electric current to export.
TOSA external heat pcb board comprises the aluminium nitride heating resistor, and heating resistor is connected to the bottom of TOSA with heating TOSA, and electric current is flowed through the heating resistor heating so that TOSA is carried out temperature-compensating.
TOSA external heat pcb board also comprises the regulating resistance in parallel with the aluminium nitride heating resistor, is used for the fine setting temperature-compensating that the electric current of parallel circuits carries out TOSA with accurate control of flowing through.
TOSA external heat pcb board is fitted and is arranged on the exterior bottom of TOSA in order to heat TOSA.
Compared with prior art, beneficial effect of the present invention:
One, provides a kind of TOSA external heating device and control circuit, TOSA is carried out temperature-compensating, so that the wave length shift of laser remains in the scope of allowing;
Two, at TOSA external heat circuit regulating resistance in parallel is set, the temperature-compensating of TOSA being carried out with accurate control.
Three, use flexible PCB to connect design, the flexible PCB connected mode of compatible existing TOSA and mainboard.
Description of drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the circuit diagram of TOSA external heating device of the present invention and control circuit.
Embodiment
The present invention is described in further detail below in conjunction with test example and embodiment.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology that realizes based on content of the present invention all belong to scope of the present invention.
As depicted in figs. 1 and 2, a kind of TOSA external heating device and control circuit, comprise for provide electric current to TOSA external heat pcb board and control size of current with temperature controlled current source circuit mainboard 2, be used for carrying out the TOSA external heat pcb board 3 of external heat and being used for the flexible board 4 of the temperature controlled current source circuit mainboard of connecting band and TOSA external heat plate to TOSA1; Be with temperature controlled current source circuit mainboard 2 to be connected with TOSA external heat plate 3 by flexible board 4; TOSA external heat plate 3 is connected to TOSA1 with heating TOSA1;
Be with temperature controlled current source circuit mainboard electric current to be provided and to control size of current to TOSA external heat pcb board by flexible board, the electric current TOSA external heat pcb board of flowing through causes that TOSA external heat pcb board heating is to carry out temperature-compensating to TOSA.
The major function of this TOSA external heat circuit is, direct current flows through the high-power heating resistor of aluminium nitride that is arranged on the TOSA external heat pcb board, when the work of the high-power heating resistor of aluminium nitride, heating plate heats the LD laser of TOSA inside near the bottom of TOSA, realizes that non-cooling laser realizes the temperature requirement of CWDM SFP optical transceiver module industry shelves and the requirement of satisfied centre wavelength.
In being with temperature controlled current source circuit mainboard, Constant Direct Current electric current source is from P channel mosfet transistor, realizes control to current source output current size with the voltage of the G utmost point of the comparison circuit output voltage control MOSFET pipe of thermistor.Under different temperature environments, the output voltage of thermistor control comparison circuit, thus realize that the current source output current intensity is large under the low temperature environment, and under hot environment, the current strength of current source output is little even do not have electric current to export.
Prove with above-mentioned feature below by analyzing test data:
Table 1
As shown in table 1, secondary series representative is not carried out temperature under the case of temperature compensation at TOSA in the table 1, and what the 3rd row were corresponding is at the wavelength data that does not carry out laser under the case of temperature compensation.The 4th row are corresponding is in the situation that carry out the wavelength data of temperature-compensating laser, and the 5th tabulation is shown in the temperature after the actual TOSA that records in the situation of temperature-compensating carries out temperature-compensating, and the current strength of TOSA heating plate is flow through in the 6th row representative.
Parameter analysis in the his-and-hers watches 1 can draw, and when TOSA not being carried out temperature-compensating, usually, the wavelength of TOSA is centered by 1310nm in the time of 25 ℃, and the distance center data are nearer, illustrate that wave length shift is less, otherwise then larger.When the TOSA temperature is on the low side,, in-30 ℃ or-40 ℃, when comparing 25 ℃, the wavelength of laser drifts about clearly such as temperature, and at this moment, the TOSA wave length shift is excessive.
Contrast, carrying out after the temperature-compensating to TOSA, because the heat effect of TOSA external heat pcb board, there is certain electric current to flow through heating resistor, so that the temperature of TOSA does not raise when compensating, when changing in the interval of laser original temperature at-40 ℃-25 ℃, the wave length shift of laser all can remain on about 2nm, has reduced the variation of laser wavelength with ambient temperature.
Although the specific embodiment of the present invention is illustrated and illustrates, but be not that meaning characterizes all possible forms of the invention with the diagram of above-mentioned execution mode and explanation, more definite, used word is illustrative but not determinate in the specification, and can understand, can carry out many changes and not deviate from the spirit and scope of the present invention the present invention.
Claims (6)
1. a TOSA external heating device and control circuit, it is characterized in that, comprise for electric current is provided to TOSA external heat pcb board and with temperature controlled current source circuit mainboard, be used for carrying out the TOSA external heat pcb board of external heat and being used for the flexible board of the temperature controlled current source circuit mainboard of connecting band and TOSA external heat pcb board to TOSA; Be with temperature controlled current source circuit mainboard to be connected with TOSA external heat pcb board by flexible board; TOSA external heat pcb board is connected to TOSA with heating TOSA;
Be with temperature controlled current source circuit mainboard electric current to be provided and to control size of current to TOSA external heat pcb board by flexible board, the electric current TOSA external heat pcb board heating resistor of flowing through causes that heating pcb board heating is to carry out temperature-compensating to TOSA.
2. TOSA external heating device as claimed in claim 1 and control circuit, it is characterized in that, TOSA external heat pcb board comprises the aluminium nitride heating resistor, and the heating resistor surface label is bonded to the bottom enclosure of TOSA with heating TOSA, and electric current is flowed through the heating resistor heating so that TOSA is carried out temperature-compensating.
3. TOSA external heating device as claimed in claim 2 and control circuit, it is characterized in that, TOSA external heat pcb board also comprises the regulating resistance in parallel with the aluminium nitride heating resistor, is used for the fine setting temperature-compensating that the electric current of parallel circuits carries out TOSA with accurate control of flowing through.
4. TOSA external heating device as claimed in claim 1 and control circuit is characterized in that, TOSA external heat pcb board is fitted and is arranged on the exterior bottom of TOSA in order to heat TOSA.
5. TOSA external heating device as claimed in claim 1 and control circuit, it is characterized in that, comprise comparison circuit with thermistor with temperature controlled current source circuit mainboard, realize control to current source output with the comparison circuit output voltage control MOSFET pipe G level of thermistor.
6. TOSA external heating device as claimed in claim 5 and control circuit is characterized in that, when temperature raise, the comparison circuit output voltage reduced, and control current source output current intensity descends; When temperature reduced, the comparison circuit output voltage raise, the rising of control current source output current intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210581077.3A CN103036144B (en) | 2012-12-28 | 2012-12-28 | Tosa external heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210581077.3A CN103036144B (en) | 2012-12-28 | 2012-12-28 | Tosa external heating device |
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| CN103036144A true CN103036144A (en) | 2013-04-10 |
| CN103036144B CN103036144B (en) | 2015-11-18 |
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| CN201210581077.3A Active CN103036144B (en) | 2012-12-28 | 2012-12-28 | Tosa external heating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995705A (en) * | 2017-11-30 | 2018-05-04 | 武汉联特科技有限公司 | A kind of optical assembly applied to industrial temperature range |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20010024462A1 (en) * | 1999-09-21 | 2001-09-27 | Kouji Nakahara | Semiconductor laser module |
| CN101015100A (en) * | 2004-05-14 | 2007-08-08 | C8公司 | Temperature tuning the wavelength of a semiconductor laser using a variable thermal impedance |
| JP2008294262A (en) * | 2007-05-25 | 2008-12-04 | Nippon Telegr & Teleph Corp <Ntt> | Optical element module and its manufacturing method |
| CN101867151A (en) * | 2010-07-08 | 2010-10-20 | 华中科技大学 | Automatic compensating circuit for uncooled semiconductor laser wavelength temperature-following drift |
| CN201876241U (en) * | 2010-11-26 | 2011-06-22 | 上海神开石油化工装备股份有限公司 | High-precision high-reliability laser measuring device for hook displacement |
| CN102749684A (en) * | 2012-03-26 | 2012-10-24 | 武汉华工正源光子技术有限公司 | Laser transceiving device, manufacturing method thereof and method for improving temperature operation range thereof |
-
2012
- 2012-12-28 CN CN201210581077.3A patent/CN103036144B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010024462A1 (en) * | 1999-09-21 | 2001-09-27 | Kouji Nakahara | Semiconductor laser module |
| CN101015100A (en) * | 2004-05-14 | 2007-08-08 | C8公司 | Temperature tuning the wavelength of a semiconductor laser using a variable thermal impedance |
| JP2008294262A (en) * | 2007-05-25 | 2008-12-04 | Nippon Telegr & Teleph Corp <Ntt> | Optical element module and its manufacturing method |
| CN101867151A (en) * | 2010-07-08 | 2010-10-20 | 华中科技大学 | Automatic compensating circuit for uncooled semiconductor laser wavelength temperature-following drift |
| CN201876241U (en) * | 2010-11-26 | 2011-06-22 | 上海神开石油化工装备股份有限公司 | High-precision high-reliability laser measuring device for hook displacement |
| CN102749684A (en) * | 2012-03-26 | 2012-10-24 | 武汉华工正源光子技术有限公司 | Laser transceiving device, manufacturing method thereof and method for improving temperature operation range thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995705A (en) * | 2017-11-30 | 2018-05-04 | 武汉联特科技有限公司 | A kind of optical assembly applied to industrial temperature range |
| CN107995705B (en) * | 2017-11-30 | 2024-03-22 | 武汉联特科技股份有限公司 | Optical assembly applied to industrial temperature range |
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| CN103036144B (en) | 2015-11-18 |
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