CN201796077U - Laser device bias current monitoring circuit with APC (automatic phase control) function - Google Patents
Laser device bias current monitoring circuit with APC (automatic phase control) function Download PDFInfo
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- CN201796077U CN201796077U CN 201020290608 CN201020290608U CN201796077U CN 201796077 U CN201796077 U CN 201796077U CN 201020290608 CN201020290608 CN 201020290608 CN 201020290608 U CN201020290608 U CN 201020290608U CN 201796077 U CN201796077 U CN 201796077U
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- npn triode
- bias current
- monitoring circuit
- operational amplifier
- current monitoring
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Abstract
The utility model provides a laser device bias current monitoring circuit with an APC (automatic phase control) function, and the structure comprises that: the cathode of an LD (laser diode) is grounded; the cathode of a PD is connected with Vcc (virtual channel connection); an operational amplifier is connected with the Vcc, emitting light power setting voltage of the LD is connected with the positive output end of the operational amplifier through a first insulating resistor, the anode of the PD is connected with the negative output end of the operational amplifier through a second insulating resistor, one end of a first sampling resistor is connected with the anode of the PD, and the other end of the first sampling resistor is grounded; a feedback capacitor is connected between the anode of the PD and the output end of the operational amplifier; a first NPN triode is connected with the base electrode of a second NPN triode and is connected with the output end of the operational amplifier through a first current-limiting resistor; and the first NPN triode and the collector of the second NPN triode are respectively connected with the Vcc through a second current-limiting resistor and a second current-limiting resistor, the anode of the PD is connected with the emitting electrode of the first NPN triode, the emitting electrode of the second NPN triode is grounded through a second sampling resistor, and a bias current signal of the LD is output through the emitting electrode of the second NPN triode. The laser device bias current monitoring circuit has fewer elements, and only one sampling resistor is needed, thus being simple for realization.
Description
Technical field
The utility model relates to the electric absorption externally modulated laser that is used at a high speed long distance, relates in particular to the laser bias current monitoring circuit of a kind of band APC (Automatic Power Controller is hereinafter to be referred as APC).
Background technology
In the optical communication transmission system, in order to realize the transmission of data on optical fiber, signal demand carries out electric light conversion and opto-electronic conversion by optical transceiver module, and the electric light conversion is to finish by semiconductor laser.To laser instrument, the emission luminous power of user's original definition is an important parameter, variation along with the aging and environment temperature of laser instrument, laser diode (Laser Diode, hereinafter to be referred as LD) the slope of characteristic curve raise with temperature as time passes and descend, so LD must guarantee stable luminous power output by corresponding laser control circuit.At present a large amount of optical transmission systems that use, most of base station are arranged on the open air or even away from the zone of the signs of human habitation, this just makes optical transmission system must possess automatic supervision and reporting functions, for optical transceiver module, also must possess automatic function for monitoring.And laser bias current (TX-Bias) is exactly one important in the monitored parameter, and it has very great help for life-span and the duty of judging laser instrument.Be used for a kind of band APC laser bias current monitoring circuit of the integrated module of optical transceiver of at a high speed long distance as shown in Figure 1, comprise: a LD, its plus earth; One monitor photodiode (Photo Diode is hereinafter to be referred as PD), its negative electrode connects power Vcc; The first operational amplifier IC1 connects power Vcc, the emission luminous power of LD is provided with voltage connects the first operational amplifier IC1 by the first isolation resistance R1 positive input terminal, monitor that the anode of PD connects the negative input end of the first operational amplifier IC1 on the one hand by the second isolation resistance R2, on the other hand by one first sampling resistor R3 ground connection; The base stage of one NPN triode connects the output terminal of the first operational amplifier IC1 by the first current-limiting resistance R4, and its collector is connected to power Vcc by a series connection resistance R 5, and its emitter connects the anode of LD by the second sampling resistor R6.The LD bias current need be in the two ends Direct Sampling of the second sampling resistor R6, and the voltage of sampling has the common mode composition, and when power Vcc changed, bias current also can change, and causes monitoring value inaccurate.Improvement project is LD bias current sampled point 1 connects the second operational amplifier IC2 by the 3rd isolation resistance R7 a positive input terminal, LD bias current sampled point 2 the 4th isolation resistance R8 connects the negative input end of the second operational amplifier IC2, feedback resistance R9 connects between the positive input terminal and output terminal of the second operational amplifier IC2, the output terminal of the second operational amplifier IC2 is through pull-up resistor R10 ground connection, and the output signal of the second operational amplifier IC2 is exactly through the LD bias current signal after its computing.The components and parts that this kind circuit arrangement adopts are more, and it is bigger to take up room, the circuit more complicated.
The utility model content
In order to overcome above shortcoming, the utility model provides that components and parts are few, the simple a kind of laser bias current monitoring circuit with APC of circuit.
For realizing above goal of the invention, the utility model adopts following technical scheme: a kind of laser bias current monitoring circuit with APC comprises: a LD, its plus earth; One monitors PD, and its negative electrode connects power Vcc; One operational amplifier connects power Vcc, LD emission luminous power is provided with voltage connects described operational amplifier by one first isolation resistance positive input terminal, the anode of described supervision PD connects the negative input end of described operational amplifier by one second isolation resistance, one end of one first sampling resistor connects the anode of described supervision PD, other end ground connection; One feedback capacity is connected between the output terminal of the anode of described supervision PD and described operational amplifier; The base stage of one the one NPN triode and one the 2nd NPN triode interconnects, and connects the output terminal of described operational amplifier by first current-limiting resistance; The collector of a described NPN triode and the 2nd NPN triode is connected described power Vcc by second, third current-limiting resistance respectively, the anode of described LD connects the emitter of a described NPN triode, the emitter of described second NPN triode is by one second sampling resistor ground connection, and the LD bias current signal is by the emitter output of described the 2nd NPN triode.
Described power Vcc is got 3.3V or 5V.
The value of described first, second isolation resistance is 20K Ω～1000K Ω.
The value 0.1K Ω～50K Ω of described first sampling resistor.
The value 0.1K Ω～10K Ω of described second sampling resistor.
The value 0K Ω～2K Ω of described first current-limiting resistance.
Described second and the value of the 3rd current-limiting resistance be 0K Ω～10K Ω.
The value 0.01 μ F～10 μ F of described feedback capacity.
Above-mentioned two NPN triodes can be selected an integrated component for use, and element is few; Sampled voltage has only a bit, does not have common mode problem, and is proportional to the bias current of laser instrument fully.Laser bias current only needs a sampling resistor, realizes simply, as long as calibration is out of question, and the monitoring value entirely accurate.
Description of drawings
Fig. 1 represents the laser bias current monitoring circuit of prior art band APC.
Fig. 2 represents the laser bias current monitoring circuit synoptic diagram of the utility model band APC.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
A kind of laser bias current monitoring circuit with APC as shown in Figure 2 comprises: a LD1, its plus earth.One monitors PD2, and its negative electrode connects power Vcc, gets 3.3V or 5V.One operational amplifier 3 connects power Vcc.LD emission luminous power is provided with the positive input terminal of voltage (TX-power set) by one first isolation resistance, 4 concatenation operation amplifiers 3, monitor the negative input end of the anode of PD2 by one second isolation resistance, 5 concatenation operation amplifiers 3, wherein, the value of first, second isolation resistance 4,5 is 20K Ω～1000K Ω.One first sampling resistor, 6 one ends connect the anode that monitors PD2, other end ground connection, value 0.1K Ω～50K Ω.One feedback capacity 7 is connected between the output terminal of the anode that monitors PD2 and operational amplifier 3, feedback capacity 7 values 0.01 μ F～10 μ F.The base stage of one the one NPN triode 8 and one the 2nd NPN triode 9 interconnects, and passes through the output terminal of first current-limiting resistance, 10 concatenation operation amplifiers 3, first current-limiting resistance, 10 value 0K Ω～2K Ω.The collector of the one NPN triode 8 and the 2nd NPN triode 9 is connected power Vcc by second, third current-limiting resistance 11,12 respectively, and wherein the value of the second and the 3rd current-limiting resistance 11,12 is 0K Ω～10K Ω.The anode of LD1 connects the emitter of a NPN triode 8, and the emitter of the 2nd NPN triode 9 passes through second sampling resistor, 13 ground connection, this resistance value 0.1K Ω～10K Ω, and the LD bias current signal is by the emitter output of the 2nd NPN triode 9.
During above-mentioned laser bias current monitoring circuit operate as normal, the operational amplifier 3 LD emission luminous power that its input end is set is provided with voltage (TX-Power Set) and compares with the level that monitors the conversion of PD2 standby current, and export by integrating circuit, make the optical power change of output smoother, can mutagenesis.When the voltage of the standby current conversion that monitors PD2 when level is set, when that is to say the LD Output optical power less than setting power, it is big that output voltage becomes, it is big that the output current of a NPN triode 8 becomes, big through the electrorheological of LD1, then luminous increase.When the voltage of the standby current conversion that monitors PD2 when level is set, when that is to say Output optical power greater than setting power, output voltage diminishes, the output current of the one NPN triode 8 diminishes, electric current through LD1 diminishes, then luminous reducing finished the APC auto light power control of LD1 by this kind mode.When the electrorheological of a NPN triode 8 was big, the electric current of the 2nd NPN triode 9 was also followed and is become big, and the electric current by second sampling resistor 13 also becomes greatly, and it is big that sampled voltage becomes, and the bias current supervision quantitative change of LD1 is big; When the electrorheological of a NPN triode 8 hour, the electric current of the 2nd NPN triode 9 is also followed and is diminished, electric current by second sampling resistor 13 also diminishes, sampled voltage diminishes, the bias current monitoring amount of LD1 diminishes, as long as draw coefficient between monitoring value and the actual value by calibration, monitoring amount will react the variation of LD bias current signal truly, so just can judge life-span and the duty of LD1 by the size of monitoring amount.Two NPN triodes can be selected an integrated component for use, and element is few; Laser bias current only needs a sampling resistor, does not have common mode problem, and is proportional to the bias current of laser instrument fully.Only, realize simply with a sampling resistor, as long as calibration is out of question, the monitoring value entirely accurate.
Claims (8)
1. the laser bias current monitoring circuit with APC is characterized in that, comprising: a LD (1), its plus earth; One monitors PD (2), and its negative electrode connects power Vcc; One operational amplifier (3) connects power Vcc, LD emission luminous power is provided with voltage connects described operational amplifier (3) by one first isolation resistance (4) positive input terminal, the anode of described supervision PD (2) connects the negative input end of described operational amplifier (3) by one second isolation resistance (5), one end of one first sampling resistor (6) connects the anode of described supervision PD (2), other end ground connection; One feedback capacity (7) is connected between the output terminal of the anode of described supervision PD (2) and described operational amplifier (3); The base stage of one the one NPN triode (8) and one the 2nd NPN triode (9) interconnects, and connects the output terminal of described operational amplifier (3) by first current-limiting resistance (10); The collector of a described NPN triode (8) and the 2nd NPN triode (9) is connected described power Vcc by second, third current-limiting resistance (11,12) respectively, the anode of described LD (1) connects the emitter of a described NPN triode (8), the emitter of described the 2nd NPN triode (9) is by one second sampling resistor (13) ground connection, and the LD bias current signal is by the emitter output of described the 2nd NPN triode (9).
2. the laser bias current monitoring circuit of band APC according to claim 1 is characterized in that described power Vcc is got 3.3V or 5V.
3. the laser bias current monitoring circuit of band APC according to claim 2 is characterized in that the value of described first, second isolation resistance (4,5) is 20K Ω～1000K Ω.
4. the laser bias current monitoring circuit of band APC according to claim 3 is characterized in that the value 0.1K Ω～50K Ω of described first sampling resistor (6).
5. the laser bias current monitoring circuit of band APC according to claim 4 is characterized in that the value 0.1K Ω～10K Ω of described second sampling resistor (13).
6. the laser bias current monitoring circuit of band APC according to claim 5 is characterized in that the value 0K Ω～2K Ω of described first current-limiting resistance (10).
7. the laser bias current monitoring circuit of band APC according to claim 6 is characterized in that the value of the described second and the 3rd current-limiting resistance (11,12) is 0K Ω～10K Ω.
8. the laser bias current monitoring circuit of band APC according to claim 7 is characterized in that the value 0.01 μ F～10 μ F of described feedback capacity (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020290608 CN201796077U (en) | 2010-08-12 | 2010-08-12 | Laser device bias current monitoring circuit with APC (automatic phase control) function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020290608 CN201796077U (en) | 2010-08-12 | 2010-08-12 | Laser device bias current monitoring circuit with APC (automatic phase control) function |
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| CN201796077U true CN201796077U (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201020290608 Expired - Lifetime CN201796077U (en) | 2010-08-12 | 2010-08-12 | Laser device bias current monitoring circuit with APC (automatic phase control) function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389450A (en) * | 2012-05-07 | 2013-11-13 | 中磊电子股份有限公司 | Light judgment circuit |
| CN105099544A (en) * | 2014-04-30 | 2015-11-25 | 富士通株式会社 | Bias monitoring method and device and optical transmitter |
| CN106249027A (en) * | 2016-08-25 | 2016-12-21 | 国网青海省电力公司海南供电公司 | A kind of 10kv voltage monitor |
| CN106300007A (en) * | 2016-10-13 | 2017-01-04 | 华北电力大学（保定） | The drive circuit for laser that the output of a kind of frequency power is stable |
| CN110674586A (en) * | 2019-09-29 | 2020-01-10 | 武汉东飞凌科技有限公司 | Data processing method and device |
| CN111693757A (en) * | 2020-06-22 | 2020-09-22 | 索尔思光电（成都）有限公司 | LD bias current detection method and circuit, and optical module |
| CN117955440A (en) * | 2023-11-24 | 2024-04-30 | 无锡天和电子有限公司 | Isolation amplifier for outputting high-precision current signal |
| CN117955440B (en) * | 2023-11-24 | 2024-09-24 | 无锡天和电子有限公司 | Isolation amplifier for outputting high-precision current signal |
-
2010
- 2010-08-12 CN CN 201020290608 patent/CN201796077U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389450A (en) * | 2012-05-07 | 2013-11-13 | 中磊电子股份有限公司 | Light judgment circuit |
| CN103389450B (en) * | 2012-05-07 | 2015-11-04 | 中磊电子股份有限公司 | Light decision circuitry |
| CN105099544A (en) * | 2014-04-30 | 2015-11-25 | 富士通株式会社 | Bias monitoring method and device and optical transmitter |
| CN105099544B (en) * | 2014-04-30 | 2018-01-05 | 富士通株式会社 | Bias monitor method, apparatus and optical sender |
| CN106249027A (en) * | 2016-08-25 | 2016-12-21 | 国网青海省电力公司海南供电公司 | A kind of 10kv voltage monitor |
| CN106300007A (en) * | 2016-10-13 | 2017-01-04 | 华北电力大学（保定） | The drive circuit for laser that the output of a kind of frequency power is stable |
| CN110674586A (en) * | 2019-09-29 | 2020-01-10 | 武汉东飞凌科技有限公司 | Data processing method and device |
| CN111693757A (en) * | 2020-06-22 | 2020-09-22 | 索尔思光电（成都）有限公司 | LD bias current detection method and circuit, and optical module |
| CN117955440A (en) * | 2023-11-24 | 2024-04-30 | 无锡天和电子有限公司 | Isolation amplifier for outputting high-precision current signal |
| CN117955440B (en) * | 2023-11-24 | 2024-09-24 | 无锡天和电子有限公司 | Isolation amplifier for outputting high-precision current signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170531 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Patentee after: Shenzhen Apat Optoelectronics Components Co., Ltd. Address before: South South technology twelve road 518057 in Guangdong Province, Shenzhen high tech Industrial Park, No. 8 Frestech. Patentee before: Shenzhen Neo Photonic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110413 |
|
| CX01 | Expiry of patent term |