CN111953422A - Parallel light emitting circuit - Google Patents
Parallel light emitting circuit Download PDFInfo
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- CN111953422A CN111953422A CN202010827777.0A CN202010827777A CN111953422A CN 111953422 A CN111953422 A CN 111953422A CN 202010827777 A CN202010827777 A CN 202010827777A CN 111953422 A CN111953422 A CN 111953422A
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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Abstract
The invention discloses a parallel light emitting circuit, and belongs to the field of photoelectric digital transceiving modules. A parallel light emitting circuit includes a microprocessor, a driver, and a laser array; the microprocessor is used for sending a control command, receiving feedback and alarm signals of the driver and setting compensation for the driver; the driver is used for detecting, processing and driving the laser array on the electric signal; the driver is used for realizing multi-channel parallel data transmission, the driver is provided with 12 independent channels, the data transmission rate of a single channel is 10Gb/s, and each channel can work independently; the laser array is used for emitting laser. The parallel light emitting circuit can complete the function of converting an electric signal into an optical signal, and can realize high-speed data transmission with maximum capacity of 12 multiplied by 10Gb/s by adopting a circuit structure of highly integrated multi-channel drivers, laser arrays and microprocessors; the invention has the characteristics of high data rate and high line integration level.
Description
Technical Field
The invention belongs to the field of photoelectric digital transceiving modules, and particularly relates to a parallel light emitting circuit.
Background
With the great challenge of increasing bandwidth and speed requirements on communication technology, high-capacity and high-speed optical communication has become a necessary trend for the development of the information age. The optical communication technology is a communication technology using light waves as carrier waves and free spaces or waveguides as transmission media, has been widely applied to various military and civil communication fields such as national defense and telecommunication by virtue of the advantages of high speed, large capacity, interference resistance, low cost and the like, and becomes a cornerstone of modern information technology.
As a core component of optical communication, the technical development of an optical transceiver module is also becoming mature, and gradually develops in the directions of high speed, intellectualization and miniaturization. The optical transceiver module mainly completes the optical-electric/electric-optical conversion function of optical signals, integrates transmitting, receiving, various functional circuits and a standardized optical fiber connector into a whole, and forms a high-speed integrated system module.
At present, the optical transceiving technology with the transmission rate of 10Gb/s is mature and applied in a large quantity, a single-channel structure is mostly adopted, but along with the requirement of higher rate, a plurality of single-channel modules are generally used in parallel, so that the requirement of high rate is met.
Disclosure of Invention
The invention aims to overcome the defect that the parallel use technology of single-channel modules in the prior art is difficult to ensure the high consistency of the parameters of a plurality of devices, and provides a parallel light emitting circuit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a parallel light emitting circuit includes a microprocessor, a driver, and a laser array;
the microprocessor is used for sending a control command, receiving feedback and alarm signals of the driver and setting compensation for the driver;
the driver is used for detecting, processing and driving the laser array on the electric signal;
the driver is provided with 12 independent channels, the data transmission rate of a single channel is 10Gb/s, each channel works independently, and multi-channel parallel data transmission can be realized;
the laser array is used for emitting laser.
Further, the microprocessor has I2C, serial data communication function and a plurality of I/O universal interfaces;
the driver generates driving current after processing the received differential electric signals;
average current, modulation current, laser array disable enable, current monitor output mode, temperature detection enable, signal transfer characteristics and compensation and fault detection threshold pass I for microprocessors2C, setting the serial data interface in a mode of configuring an internal register;
the laser array is excited by a driving current, the excited optical signal has a fixed wavelength, and the power of the excited optical signal is in direct proportion to the driving current.
Further, the driver generates feedback data according to the input signal, the device temperature and the driving current, and the feedback data are output by corresponding pins;
and the microprocessor collects the feedback data and the power supply voltage value to realize the functions of monitoring the driving current of the laser array, monitoring the working temperature, detecting signals and monitoring the power supply voltage.
Further, a signal processing functional module for compensating attenuation of the input electric signal in the line transmission process is integrated in the driver.
Further, the microprocessor is also used for controlling the temperature according to the real-time working temperature2And C, compensating and setting the average current and the trimming current of the driver to realize the compensation of the output optical power and the extinction ratio.
Further, the model of the laser array is a VCSEL laser array ULM 850-14-TT-F0104U;
the driver model is HXT 6112;
the microprocessor is model number C8051f 990.
Further, both the HXT6112 driver and the C8051f990 microprocessor adopt 3.3V power supply for power supply;
the 12 pairs of differential signal positive inputs are respectively connected to the AxP port of the driver, the 12 pairs of differential signal negative inputs are respectively connected to the AxN port of the driver, and x is 1-12;
the driving current output end LxP of the driver is respectively connected with the anode of the laser array; and power supply terminal VEE2 is connected to the cathode of the laser array;
the I/O interfaces of the microprocessor are respectively connected with the drivers NOTINT, IMON and VTHERMLDIS and VCC, I of microprocessor2The interface C is connected with SDA and SCL of the driver. Compared with the prior art, the invention has the following beneficial effects:
the parallel light emitting circuit can complete the function of converting an electric signal into a light signal, adopts a circuit of highly integrated multi-channel drivers, laser arrays and microprocessors, can respectively open or close each channel of the driver, and independently complete the processing of detection, compensation and the like on the received differential electric signal, adopts multi-channel (at most 12 channels) parallel data transmission, and can realize the high-speed data transmission with the maximum capacity of 12 multiplied by 10 Gb/s; the circuit structure of the invention has the characteristics of high data rate and high circuit integration level.
Further, data interaction between the driver and the microprocessor enables monitoring of drive current, operating temperature, and supply voltage.
Further, the signal processing function within the driver is able to compensate for attenuation of high frequency components of the electrical signal in the transmission link.
Furthermore, the microprocessor can also carry out temperature compensation, and can ensure that the output optical power is more than-5 dB and the extinction ratio is more than 5dB within the range of ambient temperature of-55-85 ℃.
Further, 12 channels are integrated on the HXT6112 driving chip, the technological parameters are completely consistent, and the consistency of the parameters of each channel can be realized.
Drawings
FIG. 1 is a functional block diagram of a parallel multimode optical transmit circuit;
fig. 2 is a schematic diagram of a parallel multimode optical transmit circuit.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention adopts the driver and the laser array which integrate 12 channels, can meet the requirement of light emission parallel work of at most 12 channels, has simple structure, small volume, low power consumption and flexible use, can monitor the functions of driving current, working temperature, signal amplitude, power supply voltage and the like, and ensures that each index of the module can meet the requirement in the range of ambient temperature-55-85 ℃ by respectively carrying out signal compensation and temperature compensation on 12 channels through the built-in microprocessor.
The invention is described in further detail below with reference to the accompanying drawings:
circuit block diagram referring to FIG. 1, the parallel optical transmitting circuit can perform the function of converting an electrical signal into an optical signal, and the circuit thereof is composed of a VCSEL laser array ULM850-14-TT-F0104U, a driver HXT6112, a microprocessor C8051F990 and a capacitor resistor. Microprocessor C8051f990 has I2C serial data communication function and I/O interface, the I/O interface of C8051f990 collects a series of feedback and alarm signals of driver and passes through I2C, configuring a register of a driver HXT 6112; the ULM850-14-TT-F0104U laser array is a laser array formed by 12 independent laser arrays, the light emitting center wavelength is 850nm under the action of the driving current of a driver, the light emitting power P is in direct proportion to the driving current I, and P is 0.4 multiplied by I; driver HXT611The driver receives the differential electrical signal, detects whether the amplitude of the signal meets a preset threshold requirement, and outputs the result, and meanwhile, the driver can also compensate the attenuation of high-frequency components in the transmission process of the input electrical signal on a line, so that the original appearance of the signal is restored to a certain degree, finally, a driving current is generated according to an average current (Iavg) and a modulation current (Imod) configured by the relevant register, the logic of the driving current is the same as that of each code element of the electrical signal, the logic high Ihigh is Iavg + Imod/2, the logic low is Iavg-Imod/2, and the laser array is driven to generate optical signals, so that the photoelectric conversion is completed. The microprocessor scans the voltage value of the temperature monitoring end (VTHERM) of the driver to calculate the working temperature of the device, and the voltage value is I2And C, resetting the drive current of the driver, and further realizing the temperature compensation of the output optical power and the extinction ratio.
Referring to fig. 2, fig. 2 is a specific circuit connection diagram, a driver HXT6112 and a microprocessor C8051f990 are powered by a 3.3V power supply, 12 pairs of differential signal positive and negative inputs are respectively connected to AxP and AxN (x is 1-12) of the driver, a driver driving current output terminal LxP is respectively connected to an anode of the laser array, a power supply terminal VEE2 is connected to a cathode of the laser array, each I/O interface of the microprocessor is respectively connected to drivers NOTINT, IMON, VTHERM, LDIS, VCC, an I2C interface of the microprocessor is connected to SDA, SCL of the driver, the specific circuit connection is shown in the schematic diagram of fig. 2, and the pin functions are shown in table 1.
TABLE 1 Pin function of devices in the Circuit
| Port number | Name (R) | Function(s) | Port number | Name (R) | Function(s) |
| 1 | A10P | 10-channel differential signal positive input | 25 | NC | - |
| 2 | A10N | 10-channel differential signal negative input | 26 | NC | - |
| 3 | A11P | 11-channel differential signal input positive | 27 | GND | Ground |
| 4 | A11N | 11-channel differential signal input negative | 28 | VCC | Power supply |
| 5 | A12P | 12-channel differential signal input positive | 29 | VCC | Power supply |
| 6 | A12N | 12-channel differential signal input negative | 30 | GND | Ground |
| 7 | GND | Ground | 31 | A1P | 1-channel differential signal input positive |
| 8 | VCC | Power supply | 32 | A1N | 1-channel differential signal input negative |
| 9 | VCC | Power supply | 33 | A2P | 2-channel differential signal input positive |
| 10 | GND | Ground | 34 | A2N | 2-channel differential signal input negative |
| 11 | CONF2 | Mode control 2 | 35 | A3P | 3-channel differential signal input positive |
| 12 | Alert | Abnormal state alarm | 36 | A3N | 3-channel differential signal input negative |
| 13 | TxEn | Enabling control | 37 | A4P | 4-channel differential signal input positive |
| 14 | CONF1 | Mode control 1 | 38 | A4N | 4-channel differential signal input negative |
| 15 | IMON | Operating state feedback | 39 | A5P | 5-channel differential signal input positive |
| 16 | VTHERM | Temperature monitoring | 40 | A5N | 5-channel differential signal input negative |
| 17 | NC | - | 41 | A6P | 6-channel differential signal input positive |
| 18 | NC | - | 42 | A6N | 6-channel differential signal input negative |
| 19 | NC | - | 43 | A7P | 7-channel differential signal input positive |
| 20 | NC | - | 44 | A7N | 7-channel differential signal input negative |
| 21 | NC | - | 45 | A8P | 8-channel differential signal input positive |
| 22 | NC | - | 46 | A8N | 8-channel differential signal input negative |
| 23 | SDA | I2C data | 47 | A9P | 9-channel differential signal input positive |
| 24 | SCL | I2C clock | 48 | A9N | 9-channel differential signal input negative |
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. A parallel light emitting circuit comprising a microprocessor, a driver and a laser array;
the microprocessor is used for sending a control command, receiving feedback and alarm signals of the driver and setting compensation for the driver;
the driver is used for detecting, processing and driving the laser array on the electric signal;
the driver is provided with 12 independent channels, the data transmission rate of a single channel is 10Gb/s, each channel works independently, and multi-channel parallel data transmission can be realized;
the laser array is used for emitting laser.
2. The parallel optical transmit circuit of claim 1, wherein the microprocessor has I2C, serial data communication function and a plurality of I/O universal interfaces;
the driver generates driving current after processing the received differential electric signals;
average current, modulation current, laser array disable enable, current monitor output mode, temperature detection enable, signal transfer characteristics and compensation and fault detection threshold pass I for microprocessors2C, setting the serial data interface in a mode of configuring an internal register;
the laser array is excited by a driving current, the excited optical signal has a fixed wavelength, and the power of the excited optical signal is in direct proportion to the driving current.
3. The parallel optical transmit circuit of claim 2, wherein the driver generates feedback data based on the input signal, the device temperature, and the drive current, the feedback data being output by the respective pins;
and the microprocessor collects the feedback data and the power supply voltage value to realize the functions of monitoring the driving current of the laser array, monitoring the working temperature, detecting signals and monitoring the power supply voltage.
4. The parallel optical transmission circuit of claim 3, wherein the driver is internally integrated with a signal processing function module for compensating attenuation of the input electrical signal during the line transmission.
5. The parallel optical transmit circuit of claim 1, wherein the microprocessor is further configured to operate according to a real-time operating temperature by I2And C, compensating and setting the average current and the trimming current of the driver to realize the compensation of the output optical power and the extinction ratio.
6. The parallel optical transmission circuit of claim 1, wherein the laser array is model number VCSEL laser array ULM 850-14-TT-F0104U;
the driver model is HXT 6112;
the microprocessor is model number C8051f 990.
7. The parallel optical transmit circuit of claim 6, wherein the HXT6112 driver and the C8051f990 microprocessor are both powered by a 3.3V power supply;
the 12 pairs of differential signal positive inputs are respectively connected to the AxP port of the driver, the 12 pairs of differential signal negative inputs are respectively connected to the AxN port of the driver, and x is 1-12;
the driving current output end LxP of the driver is respectively connected with the anode of the laser array; and power supply terminal VEE2 is connected to the cathode of the laser array;
the I/O interfaces of the microprocessor are respectively connected with the drivers NOTINT, IMON, VTHERM, LDIS and VCC, and the I of the microprocessor2The interface C is connected with SDA and SCL of the driver.
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