CN202335009U - Light power control APC circuit of light transmitter - Google Patents
Light power control APC circuit of light transmitter Download PDFInfo
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- CN202335009U CN202335009U CN2011204599127U CN201120459912U CN202335009U CN 202335009 U CN202335009 U CN 202335009U CN 2011204599127 U CN2011204599127 U CN 2011204599127U CN 201120459912 U CN201120459912 U CN 201120459912U CN 202335009 U CN202335009 U CN 202335009U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Semiconductor Lasers (AREA)
Abstract
The utility model provides a light power control APC circuit of a light transmitter, which comprises a light transmitter, a current mirror image circuit, a shutoff-controllable stable voltage source, an integral amplifying circuit, a shutoff-controllable current source which synchronizes an effective electric level with the shutoff-controllable stable voltage source, a voltage control current drive circuit, a current and voltage switching circuit and a time constant regulating resistor, wherein the integral amplifying circuit comprises an operation amplifier and an integral capacitor; the two ends of the integral capacitor are respectively connected with a negative input end and a negative output end of the operation amplifier; a first end of the voltage control current drive circuit is connected with the output end of the operation amplifier, a second is connected with an output end of the shutoff-controllable current source, and a third end is connected with an LD (Laser Diode) anode; a first end of the time constant regulating resistor is connected with the output end of the shutoff-controllable stable voltage source, while a second end is connected via two paths; one path is connected with the current mirror image circuit by the current and voltage transforming circuit, while the other path is connected with the negative input end of the operation amplifier; and the other end of the current mirror image circuit is connected with an anode of a backlight diode PD.
Description
Technical field
The utility model provides a kind of optical network system with electric absorption light modulated reflector, relates in particular to a kind of electro-absorption modulation optical transmitting set luminous power control APC (Auto Power Control is hereinafter to be referred as APC) circuit.
Background technology
In the Electroabsorption Modulated Laser EML (Electro-absorption Modulated Laser) that widely applies at present; Because the needed bias current of laser is increasing; Existing laser driver is difficult to provide the requirement like big bias current; So can only take circuit outward is that Laser Drive provides desired bias current; During the laser power-up initializing or when opening, if the bias current Ibias that gets into laser a little instability will cause its Output optical power fluctuation very big, can influence the next stage receiving circuit when serious.The disclosed optical transmitting set luminous power control of the Chinese patent ZL200520063070.8 of present commonplace employing APC circuit; As shown in Figure 1, during this circuit power-up initializing or when opening, because digital regulation resistance 5 is difficult to accomplish fully synchronously with the voltage that current-to-voltage converting circuit 3 provides; So can cause the output abnormality of integrating amplification circuit 4; And when output abnormality took place, voltage controlled current drive circuit 6 was in conducting state again, like this because the bias current Ibias of laser diode LD is unstable; Cause the laser Output optical power to produce fluctuation, can cause the next stage circuit to receive moment like this and reach capacity even burn out the next stage circuit.
Summary of the invention
For overcoming above shortcoming, the utility model provides a kind of optical transmitting set luminous power control APC circuit with stable bias current.
For realizing above goal of the invention; The utility model adopts following technical scheme: a kind of optical transmitting set luminous power control APC circuit; Comprise: an optical transmitting set, a current mirror circuit, a may command turn-off source of stable pressure, an integrating amplification circuit, turn-offs source of stable pressure with said may command and holds the may command cut-off current source of synchronous significant level, a voltage controlled current drive circuit, a current-to-voltage converting circuit and time constant adjusting resistance; Said optical transmitting set comprises: a laser diode LD, a diode PD backlight and an electroabsorption modulator EA; Said LD, PD and EA three's minus earth, the EA positive pole connects modulation signal; Said integrating amplification circuit comprises an operational amplifier and an integrating capacitor, and said operational amplifier comprises a positive and negative input and an output, and said integrating capacitor two ends connect the negative input end and the output of said operational amplifier respectively; It is anodal that output, the 3rd end that output, second end that said voltage controlled current drive circuit first end connects said operational amplifier connects said may command cut-off current source connects said LD; First end that said time constant is regulated resistance connects said may command and turn-offs output, second end of source of stable pressure and divide two-way to connect: the said current-to-voltage converting circuit of leading up to connects the negative input end that said current mirror circuit, another road connect said operational amplifier, and the other end of said current mirror circuit is connected with the positive pole of said diode PD backlight.
Said current mirror circuit is a NPN current mirror chip or is connected to form by the identical NPN triode of a pair of parameter.
Said current mirror circuit is a PNP current mirror chip or is connected to form by the identical PNP triode of a pair of parameter.
Said voltage controlled current drive circuit is a PNP triode or NPN triode.
Said current-to-voltage converting circuit is a current/voltage transfer resistance, and its resistance is 0K Ω ~ 1000K Ω.
The resistance that said time constant is regulated resistance is 0K Ω ~ 1000K Ω.
The size of said integrating capacitor is 0.001uF ~ 10uF.
Because in above-mentioned luminous power control APC circuit; Be provided with a may command and turn-off source of stable pressure; An one may command cut-off current source and a time constant are regulated resistance; Can effectively control the bias current Ibias size and the time of the output of luminous power control APC circuit, and guarantee the stable output of bias current Ibias, thereby effectively reduce influence laser.
Description of drawings
Fig. 1 representes prior art optical transmitting set luminous power control APC circuit.
Fig. 2 representes the utility model optical transmitting set luminous power control APC circuit.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
Optical transmitting set luminous power control APC circuit as shown in Figure 2; Comprise: an optical transmitting set 10, a current mirror circuit 20, a may command are turn-offed source of stable pressure 30, an integrating amplification circuit 40, one and are held may command cut-off current source 50, a voltage controlled current drive circuit 60, a current-to-voltage converting circuit 70 of synchronous significant level with may command shutoff source of stable pressure 30; Regulate resistance 80 with a time constant, its resistance is 0K Ω ~ 1000K Ω.Optical transmitting set 10 comprises: a laser diode LD 11, one a diode PD12 backlight and an electroabsorption modulator EA13, and LD11, PD12 and EA13 three's minus earth, the EA13 positive pole connects modulation signal.Current mirror circuit 20 is a NPN or PNP current mirror chip or is connected to form by a pair of parameter identical NPN or PNP triode.Integrating amplification circuit 40 comprises an operational amplifier 41 and an integrating capacitor 42, and its appearance value size is 0.001uF ~ 10uF.Operational amplifier 41 comprises a positive and negative input and an output, and integrating capacitor 42 two ends are the negative input end and the output of concatenation operation amplifier 41 respectively.Voltage controlled current drive circuit 60 can be a PNP triode or NPN triode.Current-to-voltage converting circuit 70 can be a current/voltage transfer resistance, and its resistance is 0K Ω ~ 1000K Ω.Voltage controlled current drive circuit 60 is output, the anodal bias current Ibias that produces of the 3rd end connection LD11 that output, second end of the first end concatenation operation amplifier 41 of triode connects may command cut-off current source 50.Output, second end that time constant is regulated first end connection may command shutoff source of stable pressure 30 of resistance 80 divide two-way to connect: the current-to-voltage converting circuit 70 of leading up to connects an end of current mirror circuits 20, the negative input end of another road concatenation operation amplifier 41, and the other end of current mirror circuit 20 is connected with the positive pole of diode PD12 backlight.
Describe in detail with regard to the operation principle of this optical transmitting set luminous power control APC circuit below:
A, before laser is opened, should provide at first synchronously effectively that high level turn-offs source of stable pressure 30 and may command cut-off current source 50 to may command, make voltage controlled current drive circuit 60 be in cut-off state.And then provide synchronously effective low level to turn-off source of stable pressure 30 and may command cut-off current source 50 to may command, make voltage controlled current drive circuit 60 progress into conducting state.This is because may command shutoff source of stable pressure 30 offers the process that the reference voltage Vref 2 of operational amplifier 41 negative input ends has a rising; Rising to as the voltage Vref2 of negative input end in the process of reference voltage Vref 1 of operational amplifier 41 positive input terminals, the output end voltage of operational amplifier 41 is decline process reference voltage balances until its positive-negative input end.Reference voltage Vref 1, the Vref2 of operational amplifier 41 positive-negative input ends reaches the balance required time and then decided by reference voltage Vref 1 size that time constant is regulated the positive input terminal of resistance 80 and operational amplifier 41; When the time constant is regulated resistance 80 resistances fixedly the time; The reference voltage Vref 1 of the positive input terminal of operational amplifier 41 is more little; Operational amplifier 41 output end voltages are just fast more stabilization time, otherwise just slow more.And time constant is regulated resistance 80 under luminous power control APC circuit provides same bias current Ibias situation; Can regulate reference voltage Vref 1 scope that resistance 80 changes the positive input terminal of operational amplifier 41 through regulating time constant, stablize required time thereby change operational amplifier 41 output end voltages.The output voltage in may command cut-off current source 50 is uphill process.Have only when the output voltage in may command cut-off current source 50 during greater than the output voltage of operational amplifier 41; Like 60 application of voltage controlled current drive circuit in the present case are triodes; And the conducting voltage of general triode is 0.6V; Voltage controlled current drive circuit 60 just can get into conducting state, thereby makes stable bias current Ibias of luminous power control APC circuit output.
Claims (4)
1. an optical transmitting set luminous power is controlled the APC circuit; It is characterized in that; Comprise: an optical transmitting set (10), a current mirror circuit (20), a may command turn-off source of stable pressure (30), an integrating amplification circuit (40), turn-offs source of stable pressure (30) with said may command and holds the may command cut-off current source (50) of synchronous significant level, a voltage controlled current drive circuit (60), a current-to-voltage converting circuit (70) and time constant adjusting resistance (80); Said optical transmitting set (10) comprising: a laser diode LD (11), a diode PD backlight (12) and an electroabsorption modulator EA (13); Said LD (11), PD (12) and EA (13) three's minus earth, EA (13) positive pole connects modulation signal; Said integrating amplification circuit (40) comprises an operational amplifier (41) and an integrating capacitor (42); Said operational amplifier (41) comprises a positive and negative input and an output, and said integrating capacitor (42) two ends connect the negative input end and the output of said operational amplifier (41) respectively; Output, the 3rd end that output, second end that said voltage controlled current drive circuit (60) first ends connect said operational amplifier (41) connects said may command cut-off current source (50) connect said LD (11) positive pole; First end that said time constant is regulated resistance (80) connects said may command and turn-offs output, second end of source of stable pressure (30) and divide two-way to connect: the said current-to-voltage converting circuit (70) of leading up to connects the negative input end that said current mirror circuit (20), another road connect said operational amplifier (41), and the other end of said current mirror circuit (20) is connected with the positive pole of said diode PD backlight (12).
2. optical transmitting set luminous power according to claim 1 control APC circuit is characterized in that, said current mirror circuit (20) is a NPN current mirror chip or is connected to form by the identical NPN triode of a pair of parameter.
3. optical transmitting set luminous power according to claim 1 control APC circuit is characterized in that, said current mirror circuit (20) is a PNP current mirror chip or is connected to form by the identical PNP triode of a pair of parameter.
4. according to claim 2 or 3 described optical transmitting set luminous power control APC circuit, it is characterized in that said voltage controlled current drive circuit (60) is a PNP triode or NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204599127U CN202335009U (en) | 2011-11-18 | 2011-11-18 | Light power control APC circuit of light transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204599127U CN202335009U (en) | 2011-11-18 | 2011-11-18 | Light power control APC circuit of light transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202335009U true CN202335009U (en) | 2012-07-11 |
Family
ID=46446971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204599127U Expired - Lifetime CN202335009U (en) | 2011-11-18 | 2011-11-18 | Light power control APC circuit of light transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202335009U (en) |
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2011
- 2011-11-18 CN CN2011204599127U patent/CN202335009U/en not_active Expired - Lifetime
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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 city Nanshan District high tech Industrial Park, No. 8 Frestech. Patentee before: Shenzhen Neo Photonic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |