CN111900617A - Laser drive circuit and optical module - Google Patents
Laser drive circuit and optical module Download PDFInfo
- Publication number
- CN111900617A CN111900617A CN202010701255.6A CN202010701255A CN111900617A CN 111900617 A CN111900617 A CN 111900617A CN 202010701255 A CN202010701255 A CN 202010701255A CN 111900617 A CN111900617 A CN 111900617A
- Authority
- CN
- China
- Prior art keywords
- circuit
- laser
- current
- apc
- mcu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 230000001276 controlling effect Effects 0.000 claims abstract 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to a laser driving circuit and an optical module, wherein the laser driving circuit comprises an MCU (microprogrammed control unit), an APC (automatic Power control) bias driving circuit, a switch module, a current regulating circuit and a laser, the MCU is simultaneously connected with the APC bias driving circuit and the current regulating circuit, the MCU is used for controlling and outputting driving voltage to the APC bias driving circuit and controlling and outputting working voltage to the current regulating circuit, the output current of the APC bias driving circuit is input into the laser through the current regulating circuit, and the current regulating circuit is used for regulating the current flowing into the laser. The laser driving circuit has a simple structure, and can effectively protect the laser from being damaged by high current under the condition of maintaining stable output power.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a laser driving circuit and an optical module.
Background
The optical module has the main function of realizing photoelectric/electro-optical conversion and is an important component of an optical fiber communication system. The optical module mainly includes a Transmitter Optical Subassembly (TOSA) and a Receiver Optical Subassembly (ROSA), and the laser light emitting diode LD is an essential component of the TOSA and is used to emit a laser beam. The laser driving circuit is a circuit that outputs a driving current to the laser to cause the laser to emit a laser beam. Since the light emitting efficiency of the laser is reduced after a long time of use, the laser driving circuit gradually increases the bias current in order to maintain the output power stable, but the output power is reduced when the driving current reaches a certain level, as shown in fig. 1, and the laser is easily burned out when the driving current is too large, so current limiting is an important function of the laser driving circuit. However, the conventional laser driving circuit has a relatively complex structure and high cost.
Disclosure of Invention
The invention aims to overcome the defects of complex circuit structure and high cost in the prior art, and provides a laser driving circuit and an optical module so as to simplify the circuit structure and reduce the cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in one aspect, the invention provides a laser driving circuit, which includes an MCU, an APC bias driving circuit, a current adjusting circuit and a laser, wherein the MCU is simultaneously connected to the APC bias driving circuit and the current adjusting circuit, the MCU is configured to control an output driving voltage to the APC bias driving circuit and control an output working voltage to the current adjusting circuit, an output current of the APC bias driving circuit is input to the laser through the current adjusting circuit, and the current adjusting circuit is configured to adjust a magnitude of a current flowing into the laser.
In the laser driving circuit, the MCU is used for outputting the control voltage, and the adaptive adjustment is carried out through the current adjusting circuit, so that compared with a circuit which is completely built by hardware components, the circuit structure is simplified, and the cost of the components is saved.
In a further optimized scheme, the device further comprises a switch module, and when the switch module is communicated with the input port of the APC bias driving circuit, the laser stops working; when the switch module is communicated with the current regulating circuit, the laser works normally.
In the laser driving circuit, the switching-off function can be realized by arranging the switch module, namely, when necessary, for example, the input current of the laser is overlarge, so that the laser stops working, the laser is prevented from being damaged due to overlarge current, the laser is protected, and the replacement cost of the laser is reduced.
In the further optimized scheme, the current regulating circuit comprises an MOS tube and a control circuit, the current regulating circuit passes through the control circuit is respectively connected with the MCU and the switch module, the current regulating circuit passes through the MOS tube and is respectively connected with the laser and the APC bias drive circuit, when the switch module is communicated with the control circuit, the MOS tube is in an amplification area, the laser starts to work, and when the laser normally works, the MCU controls the output working voltage to conduct the MOS tube and regulate the current flowing into the laser.
In the laser driving circuit, the regulation and the turn-off function of the input current of the laser are realized through the MOS tube, so that the circuit structure is simpler, and the performance is reliable.
Furthermore, the control circuit comprises a voltage division circuit and a current limiting circuit, the current regulating circuit is connected with the MCU through one end of the current limiting circuit, the current regulating circuit is connected with the switch module through one end of the voltage division circuit, the other end of the current limiting circuit is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the APC bias drive circuit, and the drain electrode of the MOS tube is connected with the laser.
In a further optimized scheme, the switch module comprises a single-pole double-throw switch, a COM port of the single-pole double-throw switch is grounded, an NO port of the single-pole double-throw switch is connected to a DAC port of the MCU, which is connected with the APC bias driving circuit, an NC port of the single-pole double-throw switch is connected to the voltage dividing circuit, the laser operates normally when the voltage dividing circuit is grounded by the single-pole double-throw switch, and the laser stops operating when an input port of the single-pole double-throw switch is connected to a high level.
In the laser driving circuit, through ingenious port setting, the switching-off function of the laser and the input current regulation function (matched with the MCU and the current regulation circuit) can be realized only by one single-pole double-throw switch, so that not only is the circuit structure of the switch module simplified, but also the cost of the switch is reduced.
In another aspect, the present invention provides an optical module, including a circuit board, in which a laser driving circuit according to any embodiment of the present invention is disposed.
Compared with the prior art, the invention has the following advantages:
1) through mutual cooperation of the MCU and the current regulating circuit, the MCU is used for outputting voltage and then regulating the voltage through the current regulating circuit, so that the circuit structure is simplified and the hardware cost is reduced under the condition of ensuring stable output power of the laser.
2) The current regulating circuit consists of an MOS tube and a control circuit, the control circuit comprises a current limiting circuit and a voltage dividing circuit, and the MOS tube, the current limiting circuit and the voltage dividing circuit are matched to realize current regulation and ensure the stability and reliability of the circuit.
3) The switch module only needs one single-pole double-throw switch, and can realize the function which can be realized by a plurality of single-pole switches or double-pole double-throw switches in the prior art through an ingenious port connection mode, thereby further saving the cost and simplifying the circuit structure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of laser output power as a function of bias current.
FIG. 2 is a schematic diagram of a laser driving circuit according to the present invention.
Fig. 3 is an electrical schematic diagram of a laser driver circuit of the present invention.
Fig. 4 is a schematic diagram showing the relationship between different currents under different voltage gradients of the MOS transistor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, the present embodiment schematically discloses a laser driving circuit, which includes an MCU, an APC bias driving circuit, a switch module, a current adjusting circuit, and a laser. The MCU controls to output driving voltage to the APC bias driving circuit on one hand, and controls to output working voltage to the current regulating circuit on the other hand, and regulates the magnitude of bias current flowing into the laser through the current regulating circuit, and the switch module is used for switching between a turn-off mode and a working mode to enable the laser driving circuit to work or stop working, so that the normal work of the laser is guaranteed, and the laser is protected from being damaged by high current if necessary.
The switch module may be an optional component and may not be configured when it is not considered whether the laser is damaged by high current.
More specifically, in this embodiment, the current regulating circuit includes a MOS transistor and a control circuit, the MOS transistor adopts a P-channel MOS transistor, and the relationship between the MOS transistor and the current under different voltages is shown in fig. 4. The output port of the APC bias drive circuit (APC binary drive circuit in the figure) is connected to the source of the P-channel MOS transistor, the drain of the P-channel MOS transistor is connected to the anode of the light emitting diode of the laser, the cathode of the light emitting diode is grounded, the anode of the backlight diode of the laser is grounded, and the cathode of the backlight diode of the laser is connected to one port of the APC bias drive circuit. The APC bias drive circuit drives the laser diode to emit laser beams on one hand, and realizes the detection of the output power of the laser according to the feedback of optical signals received by the backlight diode on the other hand, so that the MCU adjusts the current output to the P-channel MOS tube and then adjusts the input current of the light emitting diode.
The MCU is connected to an input port of the APC bias drive circuit through a DAC port (DAC _ APC _ set in the drawing) so that the MCU outputs the set drive current to the APC bias drive circuit. The other DAC port (DAC _ BIAS _ Limit in the figure) of the MCU is connected to the control circuit. More specifically, the control circuit comprises four resistors, wherein two resistors are connected in series to form a current limiting circuit, one end of the current limiting circuit is connected with the other DAC port (DAC _ BIAS _ Limit in the figure) of the MCU, and the other end of the current limiting circuit is connected with the gate of the P-channel MOS transistor; the other two resistors of the control circuit are connected in series to form a voltage division circuit, one end of the voltage division circuit is connected with a power supply (VCC), and the other end of the voltage division circuit is connected to the switch module. The MCU outputs voltage through the DAC _ BIAS _ Limit port, the voltage is limited by a resistor in the current limiting circuit and then is input into the P-channel MOS tube, and the input current of the light-emitting diode is adjusted through the P-channel MOS tube, so that the output power of the light-emitting diode can be kept stable. In addition, the voltage output by the MCU through the DAC _ BIAS _ Limit port has a maximum value, namely the output voltage cannot exceed the set maximum value, so that the purpose of limiting the current of the light-emitting diode is realized, and the phenomenon that the larger the current is, the smaller the output power is instead after the input current of the light-emitting diode exceeds a certain threshold value is avoided.
In the present embodiment, a P-channel MOS transistor is used to regulate the current input to the light emitting diode, but it is easy to understand that an N-channel MOS transistor may also be used to regulate the current input to the light emitting diode.
More specifically, the switch module in this embodiment includes a single-pole double-throw switch, a COM port of the single-pole double-throw switch is grounded, an NO port of the single-pole double-throw switch is connected to a DAC port of the MCU, which is connected to the APC bias drive circuit, i.e., a DAC _ APC _ set port of the MCU, an NC port of the single-pole double-throw switch is connected to the other end of the voltage divider circuit, when the voltage divider circuit is grounded by the single-pole double-throw switch, the laser operates normally, and when an input port of the single-pole double-throw switch is connected to a high level, the laser stops operating.
Referring to fig. 2, in the laser driving circuit, under normal conditions, the NC terminal of the single-pole double-throw switch is connected to the voltage divider circuit, the VG voltage can be adjusted through the output of V2, or can be set through the single chip, the P-channel MOS transistor is turned on, the bias voltage setting value output by the MCU is input to the APC bias driving circuit through the DAC _ APC _ set port, the APC bias driving circuit outputs current to the light emitting diode after passing through the MOS transistor, so as to prompt the light emitting diode to emit a laser beam, and the output power of the light emitting diode is stabilized through the adjustment of the current. When the current input into the diode is too large and exceeds a set threshold value, the laser can be damaged, a high level is input through the input port of the single-pole double-throw switch, the single-pole double-throw switch is communicated with the DAC _ APC _ set port of the MCU through the NO port, the V1 voltage is low, the set value of the target bias voltage is pulled to the ground, the APC bias driving circuit does not output current, the NC port is suspended at the moment, the VG voltage is high, the MOS tube is disconnected, NO current flows into the laser, and therefore the laser stops working, and the laser is protected from being damaged by the high current.
Fig. 3 shows an embodiment of the laser driving circuit. In the application circuit, a P-channel MOS tube adopts a SiA427DJ chip, an APC bias driving circuit adopts a 2SC5883 chip, and the APC bias driving circuit comprises devices such as an operational amplifier ad8541 and a low-frequency transistor 2SC 5663.
The above description is only for the specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and should be covered within the protection scope of the present invention.
Claims (6)
1. The utility model provides a laser instrument drive circuit, its characterized in that, includes MCU, APC bias drive circuit, current regulation circuit and laser instrument, MCU simultaneously with APC bias drive circuit current regulation circuit connects, MCU is used for controlling output drive voltage to give APC bias drive circuit to and control output operating voltage to give current regulation circuit, APC bias drive circuit's output current passes through current regulation circuit input laser instrument, and current regulation circuit is used for adjusting the electric current size that flows in the laser instrument.
2. The laser driving circuit according to claim 1, further comprising a switch module, wherein when the switch module is connected to the input port of the APC bias driving circuit, the laser current is turned off, and the laser stops operating; when the switch module is communicated with the current regulating circuit, the laser works normally.
3. The laser driving circuit according to claim 2, wherein the current adjusting circuit comprises an MOS transistor and a control circuit, the current adjusting circuit is connected to the MCU and the switch module through the control circuit, the current adjusting circuit is connected to the laser and the APC bias driving circuit through the MOS transistor, when the switch module is connected to the control circuit, the MOS transistor is in an amplification region, the laser starts to operate, and when the laser operates normally, the MCU controls the output operating voltage to turn on the MOS transistor and adjust the current flowing into the laser.
4. The laser driving circuit according to claim 3, wherein the control circuit comprises a voltage dividing circuit and a current limiting circuit, the current regulating circuit is connected to the MCU through one end of the current limiting circuit, the current regulating circuit is connected to the switch module through one end of the voltage dividing circuit, the other end of the current limiting circuit is connected to the gate of the MOS transistor, the source of the MOS transistor is connected to the APC bias driving circuit, and the drain of the MOS transistor is connected to the laser.
5. The laser driving circuit according to claim 4, wherein the switch module comprises a single-pole double-throw switch, the COM port of the single-pole double-throw switch is grounded, the NO port of the single-pole double-throw switch is connected to a DAC port of the MCU connected to the APC bias driving circuit, the NC port of the single-pole double-throw switch is connected to the voltage dividing circuit, the laser operates normally when the voltage dividing circuit is grounded by the single-pole double-throw switch, and the laser stops operating when the input port of the single-pole double-throw switch is connected to a high level.
6. An optical module comprising a circuit board having a laser driver circuit disposed therein, wherein the laser driver circuit is the laser driver circuit of any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010701255.6A CN111900617B (en) | 2020-07-20 | 2020-07-20 | Laser drive circuit and optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010701255.6A CN111900617B (en) | 2020-07-20 | 2020-07-20 | Laser drive circuit and optical module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111900617A true CN111900617A (en) | 2020-11-06 |
| CN111900617B CN111900617B (en) | 2024-01-09 |
Family
ID=73189511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010701255.6A Active CN111900617B (en) | 2020-07-20 | 2020-07-20 | Laser drive circuit and optical module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111900617B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688739A (en) * | 2020-12-16 | 2021-04-20 | 武汉永鼎光通科技有限公司 | APC control circuit that self-adaptation is shaded |
| CN113555769A (en) * | 2021-07-01 | 2021-10-26 | 浙江大学 | Underwater laser transmitter capable of generating various laser patterns |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990076264A (en) * | 1998-03-30 | 1999-10-15 | 윤종용 | Charge-Discharge Oscillator Using Constant Current and Its Oscillation Method |
| US20040264524A1 (en) * | 2003-06-30 | 2004-12-30 | Takayuki Ochiai | Semiconductor laser drive circuit and photoelectric sensor |
| CN101896028A (en) * | 2010-07-16 | 2010-11-24 | 昌芯(西安)集成电路科技有限责任公司 | Double-end current source and LED driver comprising same |
| US9614351B1 (en) * | 2016-03-24 | 2017-04-04 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Low-power, direct-drive driver circuit for driving an externally modulated laser (EML), and methods |
| CN107544351A (en) * | 2017-10-10 | 2018-01-05 | 四川九州电子科技股份有限公司 | A kind of intelligent laser device control circuit |
-
2020
- 2020-07-20 CN CN202010701255.6A patent/CN111900617B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990076264A (en) * | 1998-03-30 | 1999-10-15 | 윤종용 | Charge-Discharge Oscillator Using Constant Current and Its Oscillation Method |
| US20040264524A1 (en) * | 2003-06-30 | 2004-12-30 | Takayuki Ochiai | Semiconductor laser drive circuit and photoelectric sensor |
| CN101896028A (en) * | 2010-07-16 | 2010-11-24 | 昌芯(西安)集成电路科技有限责任公司 | Double-end current source and LED driver comprising same |
| US9614351B1 (en) * | 2016-03-24 | 2017-04-04 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Low-power, direct-drive driver circuit for driving an externally modulated laser (EML), and methods |
| CN107544351A (en) * | 2017-10-10 | 2018-01-05 | 四川九州电子科技股份有限公司 | A kind of intelligent laser device control circuit |
Non-Patent Citations (1)
| Title |
|---|
| 黄丫;田小建;于兰;卢虹;李胜男;孟瑜;: "高稳定度半导体激光器恒流驱动电路设计", 长春工程学院学报(自然科学版), no. 02, pages 37 - 40 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688739A (en) * | 2020-12-16 | 2021-04-20 | 武汉永鼎光通科技有限公司 | APC control circuit that self-adaptation is shaded |
| CN113555769A (en) * | 2021-07-01 | 2021-10-26 | 浙江大学 | Underwater laser transmitter capable of generating various laser patterns |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111900617B (en) | 2024-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111900617B (en) | Laser drive circuit and optical module | |
| US9653878B2 (en) | Circuit, optical module, methods and optical communication system for dual rate power point compensation | |
| CA2311435C (en) | Capacitor regulated high efficiency driver for light emitting diode | |
| US9843158B2 (en) | Optical module | |
| KR20020065402A (en) | Bias control circuit for power amplifier | |
| US11762409B2 (en) | Voltage regulator | |
| EP0779688B1 (en) | Laser diode driving circuit | |
| US4403139A (en) | Redundant light source circuit | |
| US7356058B2 (en) | Adaptive laser diode driver and method | |
| US20050129075A1 (en) | Laser turn-on accelerator independent of bias control loop bandwidth | |
| CN106340805B (en) | Double closed-loop control circuit of laser driver | |
| US20090041071A1 (en) | Control circuit for a laser diode and a method to control a laser diode | |
| US6807209B2 (en) | Controlling the extinction ratio of optical transmitters | |
| US20110089858A1 (en) | Load driving circuit and multi-load feedback circuit | |
| CN205724365U (en) | A kind of automatic optical power control circuit | |
| CN107888293B (en) | Optical module | |
| CN109167241B (en) | control circuit of laser | |
| US20090179492A1 (en) | Pluggable optical transceiver with function to be provided with power supplies simultaneously | |
| US6510168B1 (en) | Laser diode drive circuit | |
| JPH11126935A (en) | Laser diode drive circuit | |
| CN109326954B (en) | Laser high-speed driving module for quantum communication single photon source | |
| JPH0817258B2 (en) | Semiconductor light emitting element drive circuit | |
| CN111313226A (en) | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source | |
| CN114531011A (en) | Laser emission component and modulation control circuit thereof | |
| CN112769036B (en) | Voltage negative feedback laser driving circuit and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |