Low-power-consumption bias power supply structure of EML optical module
By designing a low-power bias power supply structure in the EML optical module, using low-voltage power supply and current regulation circuit, the problem of high energy consumption of TOSA components is solved, and about 40% power consumption saving is achieved.
Patent Information
- Application Number
- CN202421472342.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-26
AI Technical Summary
Among the existing EML optical modules, the energy consumption of TOSA components is large, mainly because the current source supply voltage inside the driver chip is 3.3V, resulting in high overall energy consumption.
Design a low-power bias power supply structure for EML optical module, connect to the low-voltage power supply VCC (less than 3.3V) through the power input circuit, and adjust the bias current using the current regulation circuit and the microprocessor U1 to reduce the power consumption of the TOSA component.
By reducing the supply voltage and optimizing current regulation, the power consumption of the TOSA component of the EML optical module is significantly reduced, saving about 40% of the power consumption compared to the existing solutions.
Smart Images
Figure CN222897299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of optical communication, in particular to a low-power bias power supply structure of an EML optical module. Background Art
[0002] In existing EML optical modules (also known as Electro-absorption Modulated Laser), a built-in driver chip is generally used to provide bias current to the laser diode of the TOSA component (also known as Transmitter Optical Subassembly) of the EML laser. However, the supply voltage of the current source inside the driver chip is basically 3.3V, which results in high energy consumption of the TOSA component as a whole.
[0003] In view of the above problems, it is necessary to study a low-power bias power supply structure of an EML optical module, which helps to reduce the power consumption of TOSA components. Utility Model Content
[0004] The utility model aims to provide a low-power bias power supply structure of an EML optical module, which helps to reduce the power consumption of a TOSA component.
[0005] In order to achieve the above purpose, the solution of the utility model is:
[0006] A low-power bias power supply structure of an EML optical module comprises a power input circuit, a current regulating circuit, a microprocessor U1 and an EML optical module; the input end of the power input circuit is connected to a low-voltage power supply VCC, the voltage of the low-voltage power supply VCC is less than 3.3V, the output end of the power input circuit is connected to the input end of the current regulating circuit, the output end of the current regulating circuit is connected to the LD+ pin of the EML optical module, the LD+ pin is connected to the positive electrode of the laser diode LD of the TOSA component inside the EML optical module, and the control end of the current regulating circuit is connected to the microprocessor U1.
[0007] The low-power bias power supply structure of the EML optical module further includes a current detection circuit, and the microprocessor U1 is connected to the power input circuit via the current detection circuit.
[0008] The power input circuit includes a resistor Rsen, a first end of the resistor Rsen is connected to the input end of the power input circuit, and a second end of the resistor Rsen is connected to the output end of the power input circuit; the current detection circuit includes a current detection chip U2, an S+ pin of the current detection chip U2 is connected to the first end of the resistor Rsen, an S- pin of the current detection chip U2 is connected to the second end of the resistor Rsen, a GND pin of the current detection chip U2 is grounded, and an OUT pin of the current detection chip U2 is connected to the microprocessor U1.
[0009] The current detection chip U2 has built-in resistors R1, R2, Rout, operational amplifier U21 and PNP transistor Q1. The resistance values of resistors R1 and R2 are the same. The first end of resistor R1 is connected to the S+ pin of the current detection chip U2, the second end of resistor R1 is connected to the inverting input terminal of the operational amplifier U21 and the emitter of the PNP transistor Q1, the second end of resistor R2 is connected to the non-inverting input terminal of the operational amplifier U21, the output terminal of the operational amplifier U21 is connected to the base of the PNP transistor Q1, the collector of the PNP transistor Q1 and the first end of resistor Rout are connected to the OUT pin of the current detection chip U2, and the second end of resistor Rout is connected to the GND pin of the current detection chip U2.
[0010] The model of the current detection chip U2 is MAX9610.
[0011] The power input circuit further includes a capacitor C1 , a first end of the capacitor C1 is connected to an input end of the power input circuit, and a second end of the capacitor C1 is grounded.
[0012] The current regulating circuit comprises a PNP transistor P1, the emitter of the PNP transistor P1 is connected to the input end of the current regulating circuit, the collector of the PNP transistor P1 is connected to the output end of the current regulating circuit, and the base of the PNP transistor P1 is connected to the control end of the current regulating circuit.
[0013] The low-power bias power supply structure of the EML optical module also includes a load switch U3 connected in series between the output end of the power input circuit and the input end of the current regulation circuit, the IN pin of the load switch U3 is connected to the output end of the power input circuit, the OUT pin of the load switch U3 is connected to the input end of the current regulation circuit, the GND pin of the load switch U3 is grounded, and the EN pin of the load switch U3 is connected to the enable signal TXdisable, and the enable signal TXdisable is used to control whether the laser diode LD of the TOSA component inside the EML optical module is working.
[0014] The model of the load switch U3 is TPS22910.
[0015] The low voltage power supply VCC is 1.8V.
[0016] After adopting the above scheme, the microprocessor U1 of the utility model adjusts the current regulating circuit so that the current regulating circuit outputs a bias current that enables the laser diode LD of the TOSA component inside the EML optical module to emit light normally, and the current regulating circuit is connected to the low-voltage power supply VCC through the input end of the power input circuit. The voltage of the low-voltage power supply VCC is less than 3.3V, that is, the voltage of the low-voltage power supply VCC is less than the power supply voltage of the existing driver chip, so the utility model can effectively reduce the power consumption of the TOSA component of the EML optical module. Preferably, the voltage of the low-voltage power supply VCC is 1.8V, so that when the same bias current is output to the laser diode LD, compared with the existing solution of using 3.3V power supply, the power consumption of the TOSA component of the EML optical module of the utility model can be saved by about 40%, and the power consumption saving is significant. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION
[0018] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.
[0019] like Figure 1 As shown, the utility model discloses a low-power bias power supply structure of an EML optical module, which includes a power input circuit, a current regulation circuit, a microprocessor U1 and an EML optical module; wherein, the input end of the power input circuit is connected to a low-voltage power supply VCC, the voltage of the low-voltage power supply VCC is less than 3.3V, the output end of the power input circuit is connected to the input end of the current regulation circuit, the output end of the current regulation circuit is connected to the LD+ pin of the EML optical module, the LD+ pin is connected to the positive electrode of the laser diode LD of the TOSA component inside the EML optical module, and the control end of the current regulation circuit is connected to the microprocessor U1.
[0020] In the present invention, the microprocessor U1 adjusts the current regulating circuit so that the current regulating circuit outputs a bias current that enables the laser diode LD of the TOSA component inside the EML optical module to emit light normally, and the current regulating circuit is connected to the low-voltage power supply VCC through the input end of the power input circuit. The voltage of the low-voltage power supply VCC is less than 3.3V, that is, the voltage of the low-voltage power supply VCC is less than the power supply voltage of the existing driver chip, so the present invention can effectively reduce the power consumption of the TOSA component of the EML optical module. Preferably, the voltage of the low-voltage power supply VCC is 1.8V, so that when the same bias current is output to the laser diode LD, compared with the existing solution using 3.3V power supply, the power consumption of the TOSA component of the EML optical module of the present invention can be saved by about 40%, and the power consumption saving is significant.
[0021] In an embodiment of the utility model, the power input circuit may include a resistor Rsen, a first end of the resistor Rsen is connected to the input end of the power input circuit, a second end of the resistor Rsen is connected to the output end of the power input circuit, and the resistor Rsen can play a role in current limiting protection. The power input circuit may also include a capacitor C1, a first end of the capacitor C1 is connected to the input end of the power input circuit, a second end of the capacitor C1 is grounded, and the capacitor C1 can play a role in stabilizing the input end voltage of the power input circuit.
[0022] In the embodiment of the utility model, the current regulating circuit includes a PNP transistor P1, the emitter of the PNP transistor P1 is connected to the input end of the current regulating circuit, the collector of the PNP transistor P1 is connected to the output end of the current regulating circuit, and the base of the PNP transistor P1 is connected to the control end of the current regulating circuit. The microprocessor U1 controls the base voltage of the PNP transistor P1 to adjust the collector current of the PNP transistor P1 (i.e., adjust the bias current output by the current regulating circuit accordingly).
[0023] In an embodiment of the utility model, the utility model also includes a current detection circuit. The microprocessor U1 is connected to the power input circuit through the current detection circuit. The microprocessor U1 detects the output current of the power input circuit through the current detection circuit, and then the microprocessor U1 calculates the bias current output by the current regulation circuit according to the amplification factor of the current regulation circuit.
[0024] In an embodiment of the utility model, the current detection circuit includes a current detection chip U2, the S+ pin of the current detection chip U2 is connected to the first end of the resistor Rsen, the S- pin of the current detection chip U2 is connected to the second end of the resistor Rsen, the GND pin of the current detection chip U2 is grounded, and the OUT pin of the current detection chip U2 is connected to the microprocessor U1. Specifically, the model of the current detection chip U2 can be MAX9610; the current detection chip U2 has built-in resistors R1, R2, Rout, operational amplifier U21 and PNP transistor Q1, the resistance values of resistors R1 and R2 are the same, the first end of resistor R1 is connected to the S+ pin of the current detection chip U2, the second end of resistor R1 is connected to the inverting input terminal of operational amplifier U21 and the emitter of PNP transistor Q1, the second end of resistor R2 is connected to the non-inverting input terminal of operational amplifier U21, the output terminal of operational amplifier U21 is connected to the base of PNP transistor Q1, the collector of PNP transistor Q1 and the first end of resistor Rout are connected to the OUT pin of current detection chip U2, and the second end of resistor Rout is connected to the GND pin of current detection chip U2. The microprocessor U1 calculates the output current of the power input circuit according to the formula: Vout= (R_out / R_1) * I_load * R_sen, wherein Vout is the output voltage of the OUT pin of the current detection chip U2, R_out is the resistance value of the resistor Rout, R_1 is the resistance value of the resistor R1, R_sen is the resistance value of the resistor Rsen, and I_load is the output current of the power input circuit.
[0025] In an embodiment of the utility model, the utility model may also include a load switch U3 connected in series between the output end of the power input circuit and the input end of the current regulation circuit. The model of the load switch U3 may be TPS22910. The IN pin of the load switch U3 is connected to the output end of the power input circuit, the OUT pin of the load switch U3 is connected to the input end of the current regulation circuit, the GND pin of the load switch U3 is grounded, and the EN pin of the load switch U3 is connected to the enable signal TXdisable. The enable signal TXdisable is used to control whether the laser diode LD of the TOSA component inside the EML optical module is working. When the level of the enable signal TXdisable is low, the load switch U3 is turned on so that the power input circuit supplies power to the current regulating circuit. At this time, the current regulating circuit outputs a bias current to the laser diode LD of the TOSA component inside the EML optical module, so that the laser diode LD emits light and works; when the level of the enable signal TXdisable is high, the load switch U3 is turned off so that the power input circuit does not supply power to the current regulating circuit. At this time, the current regulating circuit compensates and outputs a bias current to the laser diode LD of the TOSA component inside the EML optical module, so that the laser diode LD does not emit light and works. As can be seen from the foregoing, the utility model can realize the TXdisable function of the EML optical module.
[0026] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.
Claims
1. A low power bias power supply structure for an EML optical module, characterized in that: It includes a power input circuit, a current regulating circuit, a microprocessor U1 and an EML optical module; The input end of the power input circuit is connected to the low-voltage power supply VCC, the voltage of the low-voltage power supply VCC is less than 3.3V, the output end of the power input circuit is connected to the input end of the current regulation circuit, the output end of the current regulation circuit is connected to the LD+ pin of the EML optical module, the LD+ pin is connected to the positive electrode of the laser diode LD of the TOSA component inside the EML optical module, and the control end of the current regulation circuit is connected to the microprocessor U1.
2. A low power consumption bias power supply structure of an EML optical module as claimed in claim 1, characterized in that: It also includes a current detection circuit, and the microprocessor U1 is connected to the power input circuit through the current detection circuit.
3. A low power consumption bias power supply structure of an EML optical module as claimed in claim 2, characterized in that: The power input circuit comprises a resistor Rsen, a first end of the resistor Rsen is connected to an input end of the power input circuit, and a second end of the resistor Rsen is connected to an output end of the power input circuit; The current detection circuit includes a current detection chip U2, an S+ pin of the current detection chip U2 is connected to the first end of the resistor Rsen, an S- pin of the current detection chip U2 is connected to the second end of the resistor Rsen, a GND pin of the current detection chip U2 is grounded, and an OUT pin of the current detection chip U2 is connected to the microprocessor U1.
4. A low power consumption bias power supply structure of an EML optical module as claimed in claim 3, characterized in that: The current detection chip U2 has built-in resistors R1, R2, Rout, operational amplifier U21 and PNP transistor Q1. The resistance values of resistors R1 and R2 are the same. The first end of resistor R1 is connected to the S+ pin of the current detection chip U2, the second end of resistor R1 is connected to the inverting input terminal of the operational amplifier U21 and the emitter of the PNP transistor Q1, the second end of resistor R2 is connected to the non-inverting input terminal of the operational amplifier U21, the output terminal of the operational amplifier U21 is connected to the base of the PNP transistor Q1, the collector of the PNP transistor Q1 and the first end of resistor Rout are connected to the OUT pin of the current detection chip U2, and the second end of resistor Rout is connected to the GND pin of the current detection chip U2.
5. The low power consumption bias power supply structure of an EML optical module as claimed in claim 3, characterized in that: The model of the current detection chip U2 is MAX9610.
6. The low power consumption bias power supply structure of an EML optical module as claimed in claim 3, characterized in that: The power input circuit further includes a capacitor C1 , a first end of the capacitor C1 is connected to an input end of the power input circuit, and a second end of the capacitor C1 is grounded.
7. A low power consumption bias power supply structure of an EML optical module as claimed in claim 1 or 2, characterized in that: The current regulating circuit comprises a PNP transistor P1, the emitter of the PNP transistor P1 is connected to the input end of the current regulating circuit, the collector of the PNP transistor P1 is connected to the output end of the current regulating circuit, and the base of the PNP transistor P1 is connected to the control end of the current regulating circuit.
8. The low power consumption bias power supply structure of an EML optical module according to claim 1, characterized in that: It also includes a load switch U3 connected in series between the output end of the power input circuit and the input end of the current regulation circuit, the IN pin of the load switch U3 is connected to the output end of the power input circuit, the OUT pin of the load switch U3 is connected to the input end of the current regulation circuit, the GND pin of the load switch U3 is grounded, and the EN pin of the load switch U3 is connected to the enable signal TXdisable, and the enable signal TXdisable is used to control whether the laser diode LD of the TOSA component inside the EML optical module is working.
9. A low power bias power supply structure for an EML optical module as claimed in claim 8, characterized in that: The model of the load switch U3 is TPS22910.
10. The low power consumption bias power supply structure of an EML optical module according to claim 1, characterized in that: The low voltage power supply VCC is 1.8V.