CN106899352B - Photoelectric conversion device based on QSFP28 optical module - Google Patents
Photoelectric conversion device based on QSFP28 optical module Download PDFInfo
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- CN106899352B CN106899352B CN201710248389.5A CN201710248389A CN106899352B CN 106899352 B CN106899352 B CN 106899352B CN 201710248389 A CN201710248389 A CN 201710248389A CN 106899352 B CN106899352 B CN 106899352B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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Abstract
The present invention relates to a QSFP28 photoelectric conversion apparatus including: signal input device, transmitting device, receiving device and control device; the transmitting device comprises a clock data recovery circuit, a laser driver, a semiconductor laser and a wavelength division multiplexing multiplexer which are connected in sequence; the receiving device comprises a wavelength division multiplexing/demultiplexing device, a photoelectric detector and a second clock data recovery circuit which are connected in sequence; the limiting amplifier is integrated in the second clock data recovery circuit; the control device comprises: a processor and a control circuit. Under the condition of not affecting the existing 10G network frame, the invention improves the 10G network to a 40/100G network, and simultaneously improves the transmission performance and the transmission distance by a clock data recovery circuit.
Description
Technical Field
The invention relates to an optical module receiving and transmitting system, in particular to a photoelectric conversion device based on a QSFP28 optical module.
Background
With the increase of network bandwidth, the 10G rate cannot meet the transmission requirement of communication data, and the 100G transmission rate in the application networks such as a telecommunication network, a data center and the like becomes a necessary solution. The first generation of 100G optical modules was CFP optical modules, which were very bulky and short in transmission distance, and CFP2 and CFP4 optical modules were subsequently presented, where CFP4 optical modules were the current latest generation of 100G optical modules, but still bulky, and the problem of transmission distance was not solved, and the bigger the volume resulted in a smaller port density of optical modules on the switch. In short-distance transmission such as data exchange of an access internet connection port and a cloud computing data center, the 100G parallel optical module needs to be internally provided with a data selector and a splitter, so that the cost is high, and the devices integrating the data selector and the splitter are complex in process and low in reliability although the transmission distance is long.
Disclosure of Invention
The invention aims to solve the technical problems of large optical module volume, complex structure, high cost and the like in the prior art by providing a photoelectric conversion device.
The technical scheme for solving the technical problems is as follows: a QSFP28 optical module-based photoelectric conversion apparatus comprising: signal input device, transmitting device, receiving device and control device; the transmitting device comprises a clock data recovery circuit, a laser driver, a semiconductor laser and a wavelength division multiplexing multiplexer which are connected in sequence; the signal input device is electrically connected with the clock recovery circuit; the receiving device comprises a wavelength division multiplexing/demultiplexing device, a photoelectric detector and a second clock data recovery circuit which are connected in sequence; the limiting amplifier is integrated in the second clock data recovery circuit; the control device comprises: a processor and a control circuit; the processor is respectively connected with the transmitting device and the receiving device through the control circuit.
The beneficial effects of the invention are as follows: under the condition of not affecting the existing 10G network frame, the invention improves the 10G network to a 40/100G network, and simultaneously improves the transmission performance and the transmission distance by a clock data recovery circuit.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the control device further includes: and the processor is connected with the semiconductor laser through the extinction ratio compensation circuit.
The beneficial effects of adopting the further scheme are as follows: since the slope efficiency of a semiconductor laser varies with temperature, a extinction ratio compensation circuit is required to achieve a stable average laser light power.
Further, the semiconductor laser is a direct modulation semiconductor laser; the photodetector includes: a photodiode and a transimpedance amplifier; the wavelength division multiplexer/demultiplexer, the photodiode and the transimpedance amplifier are connected in sequence.
The beneficial effects of adopting the further scheme are as follows: a direct modulation semiconductor laser is adopted to improve the transmission distance of the optical signal; and the photodiode and the transimpedance amplifier are integrated in the photoelectric detector to convert the received optical signal into an electric signal and amplify the electric signal, and the electric signal converted by the photodiode is very weak and amplified first, so that the loss of information in the electric signal transmission process is avoided.
Further, the control circuit is an I2C bus circuit, and the I2C bus circuit is composed of a data line and a clock signal line.
The beneficial effects of adopting the further scheme are as follows: the I2C bus circuit is adopted for connection, and the I2C bus circuit has the advantages of few interface wires, simple control mode, small device packaging form, higher communication rate and the like.
Further, a photodiode is arranged in the semiconductor laser; the photodiode is electrically connected with the processor.
The beneficial effects of adopting the further scheme are as follows: the semiconductor laser is provided with a photodiode for detecting the light output power of the laser and transmitting the output power value detected by the photodiode to the processor, and the processor controls the laser driver to adjust the bias current through the control circuit so as to stabilize the light power of the laser.
Further, the processor is also connected with an I2C communication interface; and is in communication connection with an upper computer through the I2C communication interface.
The beneficial effects of adopting the further scheme are as follows: the processor is connected with each component in the transmitting device and the receiving device through the I2C bus circuit, detects the voltage, the temperature, the bias current of the laser, the input optical power and the receiving optical power of each component, is connected with the upper computer through the I2C communication interface in a communication mode, reports each detected parameter to the upper computer, and the upper computer controls each component in the transmitting device and the receiving device according to the parameter value through the connection with the processor.
Further, the communication connection includes: a wireless connection or a wired connection.
Further, the clock data recovery circuit is provided with 4 paths; the laser driver and the semiconductor laser are respectively provided with 4 groups, and each path of clock data recovery circuit is connected with one group of laser driver and semiconductor laser in sequence; the photoelectric detectors are arranged in 4 groups; the second clock data recovery circuit is provided with 4 paths, and each group of photodetectors is connected with one path of second clock data recovery circuit.
Further, the range of laser wavelengths emitted by the semiconductor laser is as follows: 1290 nm-1310 nm.
The beneficial effects of adopting the further scheme are as follows: the laser with longer emission wavelength is used for transmission, so that the loss of the laser is reduced, and the transmission efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a photoelectric conversion device based on a QSFP28 optical module according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a processor, an extinction ratio compensation circuit, and a semiconductor laser of a photoelectric conversion device based on a QSFP28 optical module according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a QSFP28 optical module-based photoelectric conversion device according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a QSFP28 optical module-based photoelectric conversion device according to another embodiment of the present invention;
fig. 5 is a schematic diagram showing a connection between a laser driver and a semiconductor laser circuit of a photoelectric conversion device based on a QSFP28 optical module according to another embodiment of the present invention;
Fig. 6 is a schematic circuit connection diagram of a wavelength division multiplexer/demultiplexer and a photodetector of a photoelectric conversion device based on a QSFP28 optical module according to another embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. laser driver 2, semiconductor laser 3, wavelength division multiplexing/demultiplexing device 4, photodiode 5, transimpedance amplifier.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, a QSFP28 optical module-based photoelectric conversion apparatus includes: signal input device, transmitting device, receiving device and control device; the transmitting device comprises a clock data recovery circuit, a laser driver 1, a semiconductor laser 2 and a wavelength division multiplexing multiplexer which are connected in sequence; the signal input device is electrically connected with the clock recovery circuit; the receiving device comprises a wavelength division multiplexing/demultiplexing device 3, a photoelectric detector and a second clock data recovery circuit which are connected in sequence; the limiting amplifier is integrated in the second clock data recovery circuit; the control device comprises: a processor and a control circuit; the processor is connected with the transmitting device and the receiving device through the control circuit respectively.
In the above embodiment, the signal input device is configured to generate a differential electrical signal and send the differential electrical signal to the transmitting device; the clock data recovery circuit is used for processing the differential electric signals and sending the differential electric signals to the laser driver, specifically, the clock data recovery circuit extracts clock signals and recovery signals, and dynamically establishes decision values for the sent differential electric signals so as to recover and output data; a laser driver 1 for supplying a bias current and a modulation current to the semiconductor laser 2 by the received differential electrical signal; a semiconductor laser 2 for emitting a laser signal with a modulation signal by a bias current and a modulation current; the wavelength division multiplexing multiplexer is used for synthesizing the laser signals into a beam of laser signals and outputting the laser signals; a wavelength division multiplexer/demultiplexer 3 for dividing a beam of laser signals into a plurality of laser signals of different wavelengths; the photoelectric detector is used for converting the laser signal into an electric signal; the limiting amplifier is used for amplifying the power of the electric signal step by step, so that the loss of the electric signal in the transmission process caused by the excessively weak electric signal is avoided to cause information loss; the second clock data recovery circuit is used for extracting clock signals and recovery signals of the electric signals, and dynamically establishing decision values for the received signals so as to recover and output data; the processor is connected with the transmitting device and the receiving device through the control circuit, and extracts the digital information of the corresponding ports of each part of the transmitting device and the receiving device to realize the real-time monitoring and reporting of the voltage, the temperature, the laser bias current, the input optical power and the received optical power of each channel.
As shown in fig. 2, preferably, the control device further includes: and the processor is connected with the semiconductor laser 2 through the extinction ratio compensation circuit, and the extinction ratio compensation circuit is used for realizing stable average light power of the laser because the inclined efficiency of the semiconductor laser 2 is different along with the change of temperature.
The QSFP28 optical module has a smaller package size than the 100g CFP4 optical module, which means that the QSFP28 optical module has a higher port density on the switch. The method can realize a 100Gbit/s transmission network by adopting a 100Gbit/s single-channel physical layer technology. The greatest advantage offered to data center operators is the ability to maximize bandwidth and port density under the space constraints of a 1U panel, U representing server size, 1U being equal to 44.5 mm and hole spacing 470 mm.
As shown in fig. 3, the semiconductor laser 2 is preferably a direct modulation semiconductor laser 2; the photodetector includes: a photodiode 4 and a transimpedance amplifier 5; the wavelength division multiplexing/demultiplexing device, the photodiode and the transimpedance amplifier are connected in sequence, and the direct modulation semiconductor laser 2 can effectively improve the transmission distance of laser emitted by the laser; the receiving device converts the laser signal into an electric signal through the photodiode 4, but the strength of the electric signal is very weak, and the electric signal is amplified in advance through the transimpedance amplifier 5, so that the loss of the electric signal during transmission is prevented from causing information loss.
Preferably, the control circuit is an I2C bus circuit, the I2C bus circuit is composed of a data line and a clock signal line, the I2C bus circuit is connected, and the I2C bus circuit has the advantages of being few in interface lines, simple in control mode, small in device packaging form, high in communication rate and the like, and the receiving efficiency of the processor to the transmitting device and the receiving device is improved, so that the processing efficiency is improved.
Preferably, the semiconductor laser 2 is provided with a photodiode 4; the photodiode 4 is electrically connected with the processor, the photodiode 4 is arranged in the semiconductor laser 2, the output power of a laser signal emitted by the laser is detected in real time and is sent to the processor, the processor judges the power, and the control circuit controls the laser driver to adjust the output bias current, so that the power control of the output laser signal of the semiconductor laser 2 is realized.
As shown in fig. 4, the processor is preferably also connected to an I2C communication interface; the processor is connected with each component in the transmitting device and the receiving device through the I2C communication interface, detects the voltage, the temperature, the bias current of the laser, the input optical power and the receiving optical power of each component, is connected with the upper computer through the I2C communication interface, reports each detected parameter to the upper computer, and the upper computer controls each component in the transmitting device and the receiving device according to the parameter value through the connection with the processor.
Preferably, the communication connection comprises: a wireless connection or a wired connection.
Preferably, the clock data recovery circuit is provided with 4 paths; as shown in fig. 5, the laser driver and the semiconductor laser are connected in a schematic way, the laser driver and the semiconductor laser are all provided with 4 groups, and each path of clock data recovery circuit is connected with one group of laser driver and semiconductor laser in sequence; the photoelectric detectors are arranged in 4 groups; the second clock data recovery circuit sets up 4 ways, and every group photoelectric detector all connects a second clock data recovery circuit, and photoelectric detector includes: a photodiode 4 and a transimpedance amplifier 5; the second clock data recovery circuit is provided with 4 paths, in the figure, peripheral circuits are all grounded, static electricity and redundant current on the circuits are discharged to the ground, the damage to personnel is reduced, the voltage stabilizing effect is achieved, and further the device temperature is prevented from being too high due to device power fluctuation.
Preferably, the semiconductor laser 2 emits laser light in the wavelength range of: 1290 nm-1310 nm, in particular, the wavelengths of the 4 sets of lasers are 1296 nm, 1300 nm, 1305 nm and 1309 nm.
Examples: the signal input device inputs 4 pairs of 28Gbit/s differential electric signals, after being shaped and timed by the clock data recovery circuit, the signals are received by the laser driving circuit, the laser is driven to emit 4 paths of laser with different wavelengths and provided with data modulation signals, and then the 4 paths of optical signals are combined into one path to be output by the wavelength division multiplexing combiner. The receiving unit is composed of a detector, a limiting amplifier and a CDR circuit. Considering transmission loss, the 28Gbit/s signal transmission rate is usually calculated as 25 Gbit/s; in the receiving device, a wavelength division multiplexing/demultiplexing device 3 divides one path of 100Gbit/s laser signal into 4 paths of 25Gbit/s laser signals with different wavelengths, the laser signals are converted into 4 paths of weak electric signals through a detector, the weak electric signals are amplified by a transimpedance amplifier 5 at first, then the weak electric signals are received by a limiting amplifier, and the signals amplified by the transimpedance amplifier 5 are subjected to secondary amplification to output electric signals, so that optical/electrical conversion is completed.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (7)
1. A QSFP28 optical module-based photoelectric conversion apparatus, comprising: signal input device, transmitting device, receiving device and control device; the transmitting device comprises a clock data recovery circuit, a laser driver, a semiconductor laser and a wavelength division multiplexing multiplexer which are connected in sequence; the signal input device is electrically connected with the clock recovery circuit; the receiving device comprises a wavelength division multiplexing/demultiplexing device, a photoelectric detector and a second clock data recovery circuit which are connected in sequence; the limiting amplifier is integrated in the second clock data recovery circuit; the control device comprises: a processor and a control circuit; the processor is respectively connected with the transmitting device and the receiving device through the control circuit;
The clock data recovery circuit is provided with 4 paths; the laser driver and the semiconductor laser are respectively provided with 4 groups, and each path of clock data recovery circuit is connected with one group of laser driver and semiconductor laser in sequence; the photoelectric detectors are arranged in 4 groups; the second clock data recovery circuit is provided with 4 paths, and each group of photodetectors is connected with one path of second clock data recovery circuit;
The semiconductor laser is a direct modulation semiconductor laser; the photodetector includes: a photodiode and a transimpedance amplifier; the wavelength division multiplexing/demultiplexing device, the photodiode and the transimpedance amplifier are connected in sequence;
the signal input device inputs 4 pairs of 28Gbit/s differential electric signals, after being shaped and timed by the clock data recovery circuit, the signals are received by the laser driving circuit, the laser is driven to emit 4 paths of laser with different wavelengths and provided with data modulation signals, and then the 4 paths of optical signals are combined into one path to be output by the wavelength division multiplexing combiner;
in a receiving device, a wavelength division multiplexing/demultiplexing device divides one path of 100Gbit/s laser signal into 4 paths of 25Gbit/s laser signals with different wavelengths, the 25Gbit/s laser signals are converted into 4 paths of weak electric signals through a detector, the weak electric signals are amplified by a transimpedance amplifier at first, then the weak electric signals are received by a limiting amplifier, and the signals amplified by a transimpedance amplifier 5 are subjected to secondary amplification, so that electric signals are output.
2. The QSFP28 light module-based photoelectric conversion apparatus according to claim 1, wherein the control apparatus further comprises: and the processor is connected with the semiconductor laser through the extinction ratio compensation circuit.
3. The QSFP28 optical module-based photoelectric conversion apparatus according to claim 1, wherein the control circuit is an I2C bus circuit, and the I2C bus circuit is formed of a data line and a clock signal line.
4. A QSFP28 optical module-based photoelectric conversion apparatus according to claim 1, wherein a photodiode is provided in the semiconductor laser; the photodiode is electrically connected with the processor.
5. A QSFP28 optical module based photoelectric conversion apparatus according to any of claims 1-4, wherein the processor is further coupled to an I2C communication interface; and is in communication connection with an upper computer through the I2C communication interface.
6. The QSFP28 optical module-based optical to electrical to optical conversion apparatus of claim 5, wherein the communication connection comprises: a wireless connection or a wired connection.
7. The QSFP28 optical module-based photoelectric conversion apparatus according to claim 1, wherein the range of laser wavelengths emitted by the semiconductor laser is: 1290 nm-1310 nm.
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| CN109617608A (en) * | 2018-12-25 | 2019-04-12 | 武汉恒泰通技术有限公司 | A kind of 5G optical module control system and control method |
| CN110391845A (en) * | 2019-07-24 | 2019-10-29 | 光为科技(广州)有限公司 | Optical transceiver, optical transceiver component and optical communication system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202512273U (en) * | 2012-02-28 | 2012-10-31 | 武汉飞鹏光科技有限公司 | 40G/100G CFP pluggable photoelectric transceiver module |
| CN206820758U (en) * | 2017-04-17 | 2017-12-29 | 武汉飞鹏光科技有限公司 | A kind of photoelectric conversion device based on QSFP28 optical modules |
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| CN203563070U (en) * | 2013-08-01 | 2014-04-23 | 深圳新飞通光电子技术有限公司 | Cfp optical transceiver module |
| US9722722B2 (en) * | 2014-09-19 | 2017-08-01 | Neophotonics Corporation | Dense wavelength division multiplexing and single-wavelength transmission systems |
| CN104467972A (en) * | 2014-10-23 | 2015-03-25 | 深圳市易飞扬通信技术有限公司 | 100G QSFP28 SR4 parallel optical transceiver module and packaging method thereof |
| CN112671468A (en) * | 2015-08-20 | 2021-04-16 | 中兴通讯股份有限公司 | OLT optical transceiver integrated module, method and system for processing multiple PONs |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202512273U (en) * | 2012-02-28 | 2012-10-31 | 武汉飞鹏光科技有限公司 | 40G/100G CFP pluggable photoelectric transceiver module |
| CN206820758U (en) * | 2017-04-17 | 2017-12-29 | 武汉飞鹏光科技有限公司 | A kind of photoelectric conversion device based on QSFP28 optical modules |
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