CN111900617B - Laser drive circuit and optical module - Google Patents
Laser drive circuit and optical module Download PDFInfo
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- CN111900617B CN111900617B CN202010701255.6A CN202010701255A CN111900617B CN 111900617 B CN111900617 B CN 111900617B CN 202010701255 A CN202010701255 A CN 202010701255A CN 111900617 B CN111900617 B CN 111900617B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 37
- 230000001276 controlling effect Effects 0.000 claims abstract description 6
- 230000033228 biological regulation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 235000011449 Rosa Nutrition 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000013307 optical fiber Substances 0.000 description 1
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Classifications
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- 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
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- 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, an APC 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 output driving voltage to the APC bias driving circuit and controlling output 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 is simple in 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 present invention relates to the field of optical communications technologies, and 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 light emission sub-module (TOSA) and a light reception sub-module (ROSA), and the laser light emitting diode LD is an essential component of the TOSA for emitting 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 decreases after long time use, in order to maintain stable output power, the bias current is gradually increased by the laser driving circuit, but when the driving current reaches a certain level, the output power is reduced instead, as shown in fig. 1, and when the driving current is too large, the laser is easily burned out, so current limiting is an important function of the laser driving circuit. However, the current laser driving circuit structure is relatively complex and has 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, which are used for simplifying the circuit structure and reducing the cost.
The technical scheme adopted for solving the technical problems is as follows:
in one aspect, the invention provides a laser driving circuit, which comprises an MCU, an APC bias driving circuit, a current regulating circuit and a laser, wherein the MCU is simultaneously connected with the APC bias driving circuit and the current regulating circuit, the MCU is used for controlling output driving voltage to the APC bias driving circuit and controlling output 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 magnitude of current flowing into the laser.
In the laser driving circuit, the MCU outputs the control voltage, and the current regulating circuit is used for carrying out adaptive regulation, so that compared with a circuit which is fully built by hardware components, the circuit structure is simplified, and the cost of the components is saved, therefore, the scheme of the invention can reduce the hardware cost, the size of the circuit board, and the space can be saved when the circuit board is applied to an optical module, thereby providing technical support for miniaturization of the optical module.
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 switch module is arranged to realize the turn-off function, 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 a further optimized scheme, the current regulating circuit comprises a MOS tube and a control circuit, the current regulating circuit is respectively connected with the MCU and the switch module through the control circuit, the current regulating circuit is respectively connected with the laser and the APC bias driving circuit through the MOS tube, when the switch module is communicated with the control circuit, the MOS tube is in an amplifying region, the laser starts to work, when the laser works normally, the MCU controls the output working voltage to enable the MOS tube to be conducted, and the current flowing into the laser is regulated.
In the laser driving circuit, the adjustment and the turn-off functions 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.
Further, the control circuit comprises a voltage dividing 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 dividing 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 driving 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, a NO port of the single-pole double-throw switch is connected to a DAC port connected with the MCU and the APC bias driving circuit, an NC port of the single-pole double-throw switch is connected to the voltage dividing circuit, the laser works normally when the voltage dividing circuit is grounded by the single-pole double-throw switch, and the laser stops working 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 turn-off function of the laser can be realized by only one single-pole double-throw switch, and the input current adjusting function (matched with the MCU and the current adjusting circuit) is realized, so that the circuit structure of the switch module is simplified, and the cost of the switch is reduced.
In another aspect, the present invention provides an optical module comprising a circuit board in which the laser driver circuit of any of the embodiments of the present invention is disposed.
Compared with the prior art, the invention has the following advantages:
1) Through MCU and current regulation circuit mutually supporting, utilize MCU output voltage, adjust through current regulation circuit again, under the circumstances of guaranteeing laser instrument stable output power, simplified circuit structure, reduced hardware cost.
2) The current regulating circuit consists of a MOS tube and a control circuit, wherein the control circuit comprises a current limiting circuit and a voltage dividing circuit, and the MOS tube is matched with the current limiting circuit and the voltage dividing circuit to realize current regulation, so that the stability and the reliability of the circuit can be ensured.
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 past 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 that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
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 of the relationship between different currents under different voltage gradients of the MOS transistor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the 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 the output driving voltage to the APC bias driving circuit on one hand, and controls the 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, the switch module is used for switching between an off mode and a working mode, so that the laser driving circuit works or stops working, the laser can be ensured to work normally, and the laser is protected from being damaged by high current when necessary.
The switching module may be an optional component, and may not be configured when it is not considered whether the laser is damaged due to high current.
More specifically, in this embodiment, the current adjusting circuit includes a MOS transistor and a control circuit, the MOS transistor is a P-channel MOS transistor, and the relationship between the MOS transistor and the current under different voltages is shown in fig. 4. An output port of the APC bias driving circuit (APC Bias Drive circuit in the drawing) is connected with a source electrode of a P-channel MOS transistor, a drain electrode of the P-channel MOS transistor is connected with an anode of a light emitting diode of the laser, a cathode of the light emitting diode is grounded, an anode of a back light diode of the laser is grounded, and a cathode of the back light diode of the laser is connected to one port of the APC bias driving circuit. The APC bias driving circuit drives the laser diode to emit laser beams on one hand, and on the other hand, the detection of the output power of the laser is realized according to the feedback of the optical signals received by the back light diode, so that the MCU can conveniently adjust the current output to the P-channel MOS tube, and then adjust the input current of the light emitting diode.
The MCU is connected to the input port of the APC bias driving circuit through a DAC port (dac_apc_set in the drawing) so that the MCU outputs a set driving current to the APC bias driving 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 grid electrode of the P-channel MOS tube; the other two resistors of the control circuit are connected in series to form a voltage dividing circuit, one end of the voltage dividing circuit is connected with a power supply (VCC), and the other end of the voltage dividing circuit is connected to the switch module. The MCU outputs voltage through the DAC_BIAS_Limit port, the voltage is input to the P-channel MOS tube after being limited by a resistor in the current limiting circuit, and the input current of the light emitting diode is regulated through the P-channel MOS tube, so that the output power of the light emitting diode can be kept stable. In addition, the MCU outputs a voltage with a maximum value through the DAC_BIAS_Limit port, namely the output voltage cannot exceed the set maximum value, so that the aim of limiting the current of the light-emitting diode is fulfilled, and the situation that the larger the current is, the smaller the output power is after the input current of the light-emitting diode exceeds a certain threshold value is avoided.
In this embodiment, the P-channel MOS transistor is used to adjust the current input to the light emitting diode, but it is easy to understand that the N-channel MOS transistor may also be used to adjust the current input to the light emitting diode.
More specifically, in this embodiment, the switch module includes a single-pole double-throw switch, where 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 that is connected to the APC bias driving circuit, that is, the dac_apc_set port of the MCU, and the NC port of the single-pole double-throw switch is connected to the other end of the voltage dividing circuit, and when the single-pole double-throw switch grounds the voltage dividing circuit, the laser operates normally, and when the 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 end of the single-pole double-throw switch is connected to the voltage dividing circuit, the VG voltage can be adjusted by the V2 output, and also can be set by the single-chip microcomputer, the P-channel MOS tube is turned on, the offset voltage set value output by the MCU is input to the APC offset driving circuit through the dac_apc_set port, the APC offset driving circuit outputs current to be input to the light emitting diode after passing through the MOS tube, so as to promote the light emitting diode to emit a laser beam, and the output power of the light emitting diode is stable by adjusting the current. When the current of the input diode is overlarge and exceeds a set threshold value, and 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 target bias voltage set value is pulled to the ground, the APC bias driving circuit has NO current output, 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 prevented from being damaged by high current.
Referring to fig. 3, a specific application circuit of the laser driving circuit is shown. 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 consists of an operational amplifier 8541, a low-frequency transistor 2SC5663 and other devices.
The above description is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention is intended to be covered by the scope of the present invention.
Claims (4)
1. The laser driving circuit is characterized by comprising an MCU, an APC bias driving circuit, a current regulating circuit and a laser, wherein the MCU is simultaneously connected with the APC bias driving circuit and the current regulating circuit, the MCU is used for controlling output driving voltage to the APC bias driving circuit and controlling output 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 magnitude of current flowing into the laser;
the current regulating circuit comprises a MOS tube and a control circuit, the current regulating circuit is respectively connected with the MCU and the switch module through the control circuit, the current regulating circuit is respectively connected with the laser and the APC bias driving circuit through the MOS tube, when the switch module is communicated with the control circuit, the MOS tube is in an amplifying region, the laser starts to work, and when the laser works normally, the MCU controls the output working voltage to lead the MOS tube to be conducted, and the current flowing into the laser is regulated;
the control circuit comprises a voltage dividing circuit and a current limiting circuit, wherein 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 dividing 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 driving circuit, and the drain electrode of the MOS tube is connected with the laser.
2. The laser driver circuit of claim 1, further comprising a switching module that turns off laser current and stops laser operation when the switching module is in communication with an input port of the APC bias driver circuit; when the switch module is communicated with the current regulating circuit, the laser works normally.
3. The laser driving circuit according to claim 1, 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 operates stopped when the input port of the single pole double throw switch is connected to a high level.
4. An optical module comprising a circuit board in which a laser driving circuit is arranged, characterized in that the laser driving circuit is a laser driving circuit as claimed in any one of claims 1-3.
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 |
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| Publication Number | Publication Date |
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| CN111900617A CN111900617A (en) | 2020-11-06 |
| CN111900617B true CN111900617B (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010701255.6A Active CN111900617B (en) | 2020-07-20 | 2020-07-20 | Laser drive circuit and optical module |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688739B (en) * | 2020-12-16 | 2022-08-09 | 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 | An underwater laser transmitter that can generate multiple laser patterns |
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| KR19990076264A (en) * | 1998-03-30 | 1999-10-15 | 윤종용 | Charge-Discharge Oscillator Using Constant Current and Its Oscillation Method |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005026371A (en) * | 2003-06-30 | 2005-01-27 | Sunx Ltd | Semiconductor laser drive circuit and photoelectric sensor |
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2020
- 2020-07-20 CN CN202010701255.6A patent/CN111900617B/en active Active
Patent Citations (4)
| 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 |
| 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 |
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| 高稳定度半导体激光器恒流驱动电路设计;黄丫;田小建;于兰;卢虹;李胜男;孟瑜;;长春工程学院学报(自然科学版)(02);第37-40页 * |
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