CN202841138U - Optical module and optical module chip - Google Patents
Optical module and optical module chip Download PDFInfo
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- CN202841138U CN202841138U CN 201220397006 CN201220397006U CN202841138U CN 202841138 U CN202841138 U CN 202841138U CN 201220397006 CN201220397006 CN 201220397006 CN 201220397006 U CN201220397006 U CN 201220397006U CN 202841138 U CN202841138 U CN 202841138U
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Abstract
The utility model discloses an optical module and an optical module chip thereof. The optical module comprises the optical module chip, a laser emitting light source, a photodiode and a trans-impedance amplifier, wherein the optical module chip is integrated with a microcontroller, a laser drive circuit and an amplitude limiting amplifier circuit, and the microcontroller communicates with the laser drive circuit and the amplitude limiting amplifier circuit through internal buses so as to control the laser drive circuit and the amplitude limiting amplifier circuit. According to the utility model, since normally essential circuits of the optical module are integrated into the optical module chip, the number of chips and elements in the optical module is reduced, so cost for the optical module is substantially reduced; moreover, because of a high integrated level, circuit space of the optical module is greatly saved, so interference among circuits is reduced.
Description
Technical Field
The utility model relates to an optical fiber communication technology especially relates to an optical module and optical module chip thereof.
Background
In the current domestic market and international market, the optical fiber communication direction with high bandwidth, high speed and multiple service fusion is already applied; among the many solutions, the advent of Fiber To The Home (FTTH) is considered the ultimate solution for broadband access. The domestic market has been applied in a large scale.
Among FTTH schemes, PON (passive optical network) is attracting attention and becomes the mainstream optical access mode at present. At present, the network laying of the PON is more and more. Optical modules are becoming increasingly priced as a core component of PON networks.
At present, an Optical module in the prior art generally includes a laser emitting unit and a laser receiving unit, where the laser receiving unit includes a ROSA (Receiver Optical Subassembly) and a limiting amplification circuit, and the laser receiving unit includes a TOSA and a laser driving circuit thereof; or the Optical module includes a BOSA (Bidirectional Optical Subassembly), and the BOSA can perform laser emission and reception.
The ROSA or BOSA typically includes a photodiode and TIA. The photodiode may be specifically an APD (Avalanche Photo Diode) applied to an optical module of a GPON network, or a PIN photodiode (a semiconductor photodetector with a PIN structure formed by adding an I region close to an intrinsic material between P, N junctions) applied to an optical module of an EPON network. The photodiode outputs corresponding response current Ipd after detecting the optical signal, and a TIA (Trans impedance Amplifier) outputs corresponding differential electrical signals; the differential signal is sent to a limiting amplifier, which outputs a corresponding electrical signal.
The TOSA or BOSA generally includes a laser emission light source, and a laser driving circuit of the laser emission light source drives the laser emission light source to emit laser with a specific wavelength according to a received electrical signal after receiving the electrical signal.
In addition, the existing optical module generally has a digital diagnosis function, and most of the industrial schemes adopt a chip integrating emission and reception, and are matched with a general single chip microcomputer to realize the digital diagnosis function; in addition, the optical module needs to have a circuit for boosting the voltage of the photodiode (APD) and for controlling the voltage across the photodiode (APD) and monitoring the current of the photodiode (APD). If the application of the optical module is required to be met, the single chip microcomputer is required to have more than 8 bits at least, high-precision AD and DA are provided, and an internal temperature sensor is provided. The single chip microcomputer which is required to meet the requirements in the market at present has a small model selection range and a high price, and occupies 30 to 50 percent of the cost of the optical mode fast chip scheme.
Therefore, the optical module in the prior art has high cost and needs to reduce the cost.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an optical module and optical module chip thereof for reduce the optical module cost.
According to an aspect of the utility model, an optical module is provided, include: the device comprises an optical module chip, a laser emission light source, a photodiode and a transimpedance amplifier (TIA);
the optical module chip is integrated with a microcontroller, a laser drive circuit and an amplitude limiting amplifying circuit; the microcontroller is communicated with the laser driving circuit and the amplitude limiting amplifying circuit through an internal bus and is used for controlling the laser driving circuit and the amplitude limiting amplifying circuit;
the photoelectric diode is connected with the TIA, an electric signal output end of the TIA is connected with an electric signal input end of the amplitude limiting amplifying circuit through an external pin of the optical module chip, the amplitude limiting amplifying circuit carries out amplitude limiting amplification on an electric signal input by the electric signal input end of the amplitude limiting amplifying circuit, and the electric signal after amplitude limiting amplification is output from the electric signal output end of the amplitude limiting amplifying circuit through the external pin of the optical module chip;
the laser driving circuit is connected with the laser emission light source through an external pin of the optical module chip, and an electric signal input end of the laser driving circuit receives an electric signal through the external pin of the optical module chip and drives the laser emission light source to emit laser according to the electric signal input from the electric signal input end of the laser driving circuit.
Further, the optical module further includes: a photodiode voltage control circuit; the optical module chip is also integrated with a PWM output control circuit, and the microcontroller is communicated with the PWM output control circuit through an internal bus; and the microcontroller is internally provided with an ADC device;
the photodiode voltage control circuit comprises: the FET tube, the resistors R1-R5, the diode D1 and the capacitor C1;
wherein, C1 is connected between one end of R3 and the anode of the photodiode, and the other end of R3 is connected with the cathode of the photodiode;
r1 is connected with R2 in series, and a series circuit of R1 and R2 is connected with C1 in parallel;
the cathode of D1 was connected to the junction of C1 and R3;
the R4 is connected between the grid and the drain of the FET, the source of the FET is connected with the power supply through the R5, and the source of the FET is connected with the anode of the D1;
one voltage input end of the microcontroller is connected to the connection point of R1 and R2, and the ADC device of the microcontroller detects the divided voltage of R1 or R2;
and the microcontroller controls the PWM output control circuit to output PWM waves with corresponding duty ratios through an internal bus according to the voltage on the voltage input end detected by the microcontroller, and the PWM waves are output to the grid electrode of the FET tube through the PWM output end of the PWM output control circuit.
According to another aspect of the present invention, there is provided an optical module chip, including: the device comprises a microcontroller, a laser drive circuit and an amplitude limiting amplifying circuit;
the microcontroller is communicated with the laser driving circuit and the amplitude limiting amplifying circuit through an internal bus and is used for controlling the laser driving circuit and the amplitude limiting amplifying circuit;
the electrical signal input end of the amplitude limiting amplification circuit is connected with the electrical signal output end of the TIA through an external pin of the optical module chip; the TIA is connected with a photodiode, and the photodiode is used for detecting laser and generating corresponding current; the amplitude limiting amplification circuit is used for carrying out amplitude limiting amplification on the electric signal input by the electric signal input end of the amplitude limiting amplification circuit, and the electric signal after amplitude limiting amplification is output from the electric signal output end of the amplitude limiting amplification circuit through an external pin of the optical module chip;
the laser driving circuit is connected with the laser emission light source through an external pin of the optical module chip, and an electric signal input end of the laser driving circuit receives an electric signal through the external pin of the optical module chip and drives the laser emission light source to emit laser according to the electric signal input from the electric signal input end of the laser driving circuit.
Further, the chip further comprises: a PWM output control circuit, said microcontroller communicating with said PWM output control circuit through an internal bus; and the microcontroller is internally provided with an ADC device;
one voltage input end of the micro controller is connected with the photodiode voltage control circuit;
wherein the photodiode voltage control circuit comprises: the FET tube, the resistors R1-R5, the diode D1 and the capacitor C1;
wherein, C1 is connected between one end of R3 and the anode of the photodiode, and the other end of R3 is connected with the cathode of the photodiode;
r1 is connected with R2 in series, and a series circuit of R1 and R2 is connected with C1 in parallel;
the cathode of D1 was connected to the junction of C1 and R3;
the R4 is connected between the grid and the drain of the FET, the source of the FET is connected with the power supply through the R5, and the source of the FET is connected with the anode of the D1;
one voltage input end of the microcontroller is specifically connected to a connection point of R1 and R2, and the ADC device of the microcontroller detects the partial voltage of R1 or R2;
and the microcontroller controls the PWM output control circuit to output PWM waves with corresponding duty ratios through an internal bus according to the voltage on the voltage input end detected by the microcontroller, and the PWM waves are output to the grid electrode of the FET tube through the PWM output end of the PWM output control circuit.
The embodiment of the utility model provides an optical module is owing to integrate into this optical module chip with the usual than indispensable circuit in the optical module, like laser drive circuit, amplitude limiting amplifier circuit, PWM output control circuit and microcontroller to reduce the quantity of chip and component in the optical module, greatly reduced the cost of optical module; moreover, due to the high integration level, the circuit space of the optical module can be greatly saved, and the interference between circuits is reduced.
Further, the optical module provided by the embodiment further improves a circuit for controlling the boosting of the photodiode in the prior art, one part of the circuit is integrated into the optical module chip, and the other part of the circuit is outside the optical module chip and can adjust the resistance value, the capacitance value and the like according to actual conditions.
Drawings
Fig. 1a and 1b are schematic diagrams of internal circuits of an optical module according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a photodiode voltage control circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a current mirror according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As used in this application, the terms "module," "system," and the like are intended to include a computer-related entity, such as but not limited to hardware, firmware, a combination of hardware and software, or software in execution. For example, a module may be, but is not limited to: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer.
The inventor of the utility model considers to design an optical module chip, and integrates the general more indispensable circuit in the optical module, such as laser driving circuit, amplitude limiting amplifying circuit, PWM (Pulse-Width Modulation) output control circuit and microcontroller into the optical module chip, thereby reducing the number of chips and elements in the optical module and greatly reducing the cost of the optical module; moreover, due to the high integration level, the circuit space of the optical module can be greatly saved, and the interference between circuits is reduced.
The technical solution of the embodiment of the present invention is described in detail below with reference to the accompanying drawings. The utility model discloses optical module, as shown in FIG. 1a, wherein include: the optical module comprises an optical module chip 101, a BOSA102, a photodiode voltage control circuit 103 and a storage device 104.
Alternatively, the optical module according to the embodiment of the present invention, as shown in fig. 1b, includes: the optical module chip 101, the ROSA121, the TOSA122, the photodiode voltage control circuit 103, and the memory device 104.
The BOSA102 has the same internal structure as the BOSA of the optical module in the prior art, and is not described herein again; the ROSA121 and the TOSA122 are respectively the same as the ROSA and the TOSA in the optical module in the prior art, and are not described herein again.
Specifically, the microcontroller 131, the laser driving circuit 132, the amplitude limiting amplifier circuit 133, and the PWM output control circuit 134 are integrated in the optical module chip 101.
The microcontroller 131 in the optical module chip 101 communicates with the laser driving circuit 132, the amplitude limiting amplifier circuit 133, and the PWM output control circuit 134 via an internal bus, such as an IIC bus; the micro controller 131 can thus control the laser driving circuit 132, the amplitude limiting amplification circuit 133, and the PWM output control circuit 134.
The microcontroller 131 in the optical module chip 101 is connected to the memory device 104, and reads and writes information from and into the memory device 104 via a bus (e.g., an IIC bus), or reads information stored in the memory device 104.
The microcontroller 131 in the optical module chip 101 may also communicate with other devices outside the optical module chip 101 through a communication bus. For example, communication with other devices via a serial bus or a parallel bus; accordingly, the microcontroller 131 can receive commands and data transmitted from other external devices, and can also return data to other external devices.
The laser driving circuit 132 and the amplitude limiting amplifier circuit 133 integrated in the optical module chip 101 are respectively the same as those in the optical module in the prior art, and are not described herein again.
An electrical signal input end of the laser driving circuit 132 in the optical module chip 101 may receive an electrical signal from a circuit outside the optical module chip 101, that is, an electrical signal input end of the laser driving circuit 132 may receive an electrical signal through an external pin of the optical module chip 101; the laser driving circuit 132 is further connected to a laser emitting light source in the BOSA or TOSA through an external pin of the optical module chip 101, and the laser driving circuit 132 drives the laser emitting light source to emit laser according to an electrical signal input from an electrical signal input end thereof.
The output end of a TIA electrical signal in the ROSA or TOSA is connected with the electrical signal input end of the amplitude limiting amplifier circuit 133 through an external pin of the optical module chip 101, and the amplitude limiting amplifier circuit 133 performs amplitude limiting amplification output on the electrical signal input by the electrical signal input end; the amplitude-limited amplified electrical signal is output from the electrical signal output terminal of the amplitude-limiting amplifying circuit 133 to a circuit outside the optical module chip 101 through an external pin of the optical module chip 101.
One specific circuit of the photodiode voltage control circuit 103, as shown in fig. 2, includes: a Field Effect Transistor (FET) tube, resistors R1-R5, a diode D1, and a capacitor C1;
the C1 is connected between one end of the R3 and the anode of the photodiode, and the other end of the R3 is connected with the cathode of the photodiode;
r1 is connected with R2 in series, and a series circuit of R1 and R2 is connected with C1 in parallel;
the cathode of D1 was connected to the junction of C1 and R3;
the R4 is connected across the G pole (grid) and D pole (drain) of the FET, the S pole (source) of the FET is connected with the power supply through R5, and the S pole of the FET is connected with the anode of D1.
The principle of realizing the boost control of the photodiode in the BOSA or ROSA by the photodiode voltage control circuit 103, the microcontroller 131 and the PWM output control circuit 134 integrated in the optical module chip 101 is as follows:
an ADC (Analog to digital converter) device is built in the microcontroller 131 integrated in the optical module chip 101, and can detect an Analog voltage value; one voltage input terminal of the microcontroller 131 is connected to a connection point (ADC point in fig. 2) of R1 and R2, and the divided voltage of R1 or R2 is detected by its ADC device.
The PWM output terminal of the PWM output control circuit 134 is connected to the G pole of the FET for controlling the on/off of the FET.
The microcontroller 131 controls the PWM output control circuit 134 to output a PWM wave of a corresponding duty ratio through an internal bus according to the voltage at the voltage input terminal detected by the microcontroller, and the PWM wave is output to the G pole of the FET through the PWM output terminal of the PWM output control circuit 134; thereby controlling the on-off time of the FET tube to be a specific ratio.
As can be seen from fig. 2, the longer the FET conduction time, the more charge C1 accumulates, and the higher the voltage across the photodiode, thereby boosting the photodiode. Accordingly, the microcontroller 131 can control the voltage across the photodiode by controlling the duty ratio of the PWM wave output from the PWM output control circuit 134. The microcontroller 131 also monitors the voltage at the ADC point, and controls the voltage at the two ends of the photodiode to be within a suitable voltage range through voltage feedback at the ADC point, thereby achieving the purpose of boost control of the photodiode.
Further, if still need some functions in the optical module, for example, receive the optical power detection function of light, perhaps, receive the light indication function of light, then in the optical module of the embodiment of the utility model provides an, can also include: a current mirror circuit and a sampling resistor as shown in fig. 3.
An input current path of the current mirror circuit is bridged between the cathode of the photodiode and R3, and a mirror current path of the current mirror circuit is connected in series with the sampling resistor, so that the voltage drop on the sampling resistor can reflect the magnitude of the mirror current; the magnitude of the mirror current reflects the magnitude of the output current of the photodiode; the magnitude of the photodiode output current reflects the magnitude of the optical power received by the photodiode.
The micro controller 131 detects the voltage on the sampling resistor through another voltage input terminal thereof, so that the optical power received by the photodiode can be calculated according to the detected voltage on the sampling resistor.
Further, the micro controller 131 in the optical module according to the embodiment of the present invention may further include a DAC (Digital-to-Analog Converter) device and a temperature sensor; the optical module chip 101 may further integrate a reference voltage output circuit, which may provide a reference voltage for the circuit in the optical module.
The embodiment of the utility model provides an Optical module can be the OLT (Optical line Terminal) Optical module of being applied to in the PON Network, or ONU (Optical Network Unit ) Optical module.
The embodiment of the utility model provides an optical module is owing to integrate into this optical module chip with the usual than indispensable circuit in the optical module, like laser drive circuit, amplitude limiting amplifier circuit, PWM output control circuit and microcontroller to reduce the quantity of chip and component in the optical module, greatly reduced the cost of optical module; moreover, due to the high integration level, the circuit space of the optical module can be greatly saved, and the interference between circuits is reduced.
Further, the optical module provided by the embodiment further improves a circuit for controlling the boosting of the photodiode in the prior art, one part of the circuit is integrated into the optical module chip, and the other part of the circuit is outside the optical module chip and can adjust the resistance value, the capacitance value and the like according to actual conditions.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A light module, comprising: the device comprises an optical module chip, a laser emission light source, a photodiode and a transimpedance amplifier (TIA);
the optical module chip is integrated with a microcontroller, a laser drive circuit and an amplitude limiting amplifying circuit; the microcontroller is communicated with the laser driving circuit and the amplitude limiting amplifying circuit through an internal bus and is used for controlling the laser driving circuit and the amplitude limiting amplifying circuit;
the photoelectric diode is connected with the TIA, an electric signal output end of the TIA is connected with an electric signal input end of the amplitude limiting amplifying circuit through an external pin of the optical module chip, the amplitude limiting amplifying circuit carries out amplitude limiting amplification on an electric signal input by the electric signal input end of the amplitude limiting amplifying circuit, and the electric signal after amplitude limiting amplification is output from the electric signal output end of the amplitude limiting amplifying circuit through the external pin of the optical module chip;
the laser driving circuit is connected with the laser emission light source through an external pin of the optical module chip, and an electric signal input end of the laser driving circuit receives an electric signal through the external pin of the optical module chip and drives the laser emission light source to emit laser according to the electric signal input from the electric signal input end of the laser driving circuit.
2. The optical module of claim 1, further comprising: a photodiode voltage control circuit; the optical module chip is also integrated with a PWM output control circuit, and the microcontroller is communicated with the PWM output control circuit through an internal bus; and the microcontroller is internally provided with an ADC device;
the photodiode voltage control circuit comprises: the FET tube, the resistors R1-R5, the diode D1 and the capacitor C1;
wherein, C1 is connected between one end of R3 and the anode of the photodiode, and the other end of R3 is connected with the cathode of the photodiode;
r1 is connected with R2 in series, and a series circuit of R1 and R2 is connected with C1 in parallel;
the cathode of D1 was connected to the junction of C1 and R3;
the R4 is connected between the grid and the drain of the FET, the source of the FET is connected with the power supply through the R5, and the source of the FET is connected with the anode of the D1;
one voltage input end of the microcontroller is connected to the connection point of R1 and R2, and the ADC device of the microcontroller detects the divided voltage of R1 or R2;
and the microcontroller controls the PWM output control circuit to output PWM waves with corresponding duty ratios through an internal bus according to the voltage on the voltage input end detected by the microcontroller, and the PWM waves are output to the grid electrode of the FET tube through the PWM output end of the PWM output control circuit.
3. The optical module of claim 2, further comprising: a current mirror circuit and a sampling resistor;
an input current path of the current mirror circuit is bridged between the cathode of the photodiode and R3, and a mirror current path of the current mirror circuit is connected with a sampling resistor in series;
the microcontroller detects the voltage on the sampling resistor through the other voltage input end thereof, and calculates the light power received by the photodiode according to the detected voltage on the sampling resistor.
4. A light module as claimed in any one of claims 1 to 3, further comprising: a memory device;
the microcontroller is connected with the storage device and used for reading the storage device.
5. The light module of claim 4, wherein the micro-controller communicates with other devices through a communication bus to receive commands, data from or return data to other external devices.
6. The optical module of claim 4, wherein a reference voltage output circuit is further integrated in the optical module chip.
7. The optical module according to claim 4, wherein a DAC device and a temperature sensor are built in the micro controller.
8. The optical module of claim 4, wherein the laser emission light source is packaged in a TOSA, the photodiode and TIA are packaged in a ROSA; or,
the laser emission light source, the photodiode and the TIA are packaged in the BOSA.
9. A light module chip, comprising: the device comprises a microcontroller, a laser drive circuit and an amplitude limiting amplifying circuit;
the microcontroller is communicated with the laser driving circuit and the amplitude limiting amplifying circuit through an internal bus and is used for controlling the laser driving circuit and the amplitude limiting amplifying circuit;
the electrical signal input end of the amplitude limiting amplification circuit is connected with the electrical signal output end of the TIA through an external pin of the optical module chip; the TIA is connected with a photodiode, and the photodiode is used for detecting laser and generating corresponding current; the amplitude limiting amplification circuit is used for carrying out amplitude limiting amplification on the electric signal input by the electric signal input end of the amplitude limiting amplification circuit, and the electric signal after amplitude limiting amplification is output from the electric signal output end of the amplitude limiting amplification circuit through an external pin of the optical module chip;
the laser driving circuit is connected with the laser emission light source through an external pin of the optical module chip, and an electric signal input end of the laser driving circuit receives an electric signal through the external pin of the optical module chip and drives the laser emission light source to emit laser according to the electric signal input from the electric signal input end of the laser driving circuit.
10. The chip of claim 9, further comprising: a PWM output control circuit, said microcontroller communicating with said PWM output control circuit through an internal bus; and the microcontroller is internally provided with an ADC device;
one voltage input end of the micro controller is connected with the photodiode voltage control circuit;
wherein the photodiode voltage control circuit comprises: the FET tube, the resistors R1-R5, the diode D1 and the capacitor C1;
wherein, C1 is connected between one end of R3 and the anode of the photodiode, and the other end of R3 is connected with the cathode of the photodiode;
r1 is connected with R2 in series, and a series circuit of R1 and R2 is connected with C1 in parallel;
the cathode of D1 was connected to the junction of C1 and R3;
the R4 is connected between the grid and the drain of the FET, the source of the FET is connected with the power supply through the R5, and the source of the FET is connected with the anode of the D1;
one voltage input end of the microcontroller is specifically connected to a connection point of R1 and R2, and the ADC device of the microcontroller detects the partial voltage of R1 or R2;
and the microcontroller controls the PWM output control circuit to output PWM waves with corresponding duty ratios through an internal bus according to the voltage on the voltage input end detected by the microcontroller, and the PWM waves are output to the grid electrode of the FET tube through the PWM output end of the PWM output control circuit.
11. The chip of claim 10, further comprising: and a reference voltage output circuit.
12. The chip of any one of claims 9 to 11, wherein a DAC device and a temperature sensor are built in the micro controller; and
the micro controller is communicated with other equipment through a communication bus and is used for receiving instructions and data sent by other external equipment or returning data to other external equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220397006 CN202841138U (en) | 2012-08-06 | 2012-08-06 | Optical module and optical module chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220397006 CN202841138U (en) | 2012-08-06 | 2012-08-06 | Optical module and optical module chip |
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| Publication Number | Publication Date |
|---|---|
| CN202841138U true CN202841138U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220397006 Expired - Lifetime CN202841138U (en) | 2012-08-06 | 2012-08-06 | Optical module and optical module chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843190A (en) * | 2012-08-06 | 2012-12-26 | 青岛海信宽带多媒体技术有限公司 | Optical module and optical module chip |
-
2012
- 2012-08-06 CN CN 201220397006 patent/CN202841138U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843190A (en) * | 2012-08-06 | 2012-12-26 | 青岛海信宽带多媒体技术有限公司 | Optical module and optical module chip |
| CN102843190B (en) * | 2012-08-06 | 2015-09-30 | 青岛海信宽带多媒体技术有限公司 | optical module and optical module chip thereof |
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