CN114200605A - Optical communication laser assembly coupling control system and method - Google Patents
Optical communication laser assembly coupling control system and method Download PDFInfo
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- CN114200605A CN114200605A CN202111479763.5A CN202111479763A CN114200605A CN 114200605 A CN114200605 A CN 114200605A CN 202111479763 A CN202111479763 A CN 202111479763A CN 114200605 A CN114200605 A CN 114200605A
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- coupling
- main control
- optical communication
- optical power
- communication laser
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
- G02B6/4221—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements involving a visual detection of the position of the elements, e.g. by using a microscope or a camera
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a coupling control system and a method for an optical communication laser component, wherein the system comprises a main control MCU, a motion control module and an optical power acquisition module which are respectively connected with the main control MCU, and the main control MCU is connected with an upper computer through an Ethernet interface; the main control MCU receives a coupling command sent by the upper computer, and sends a moving command to the motion control module to drive the motor shaft to move, and the main control MCU sends coordinate data read from the motion control module and optical power data read from the optical power acquisition module to the upper computer. Compared with the prior art, the invention has the following positive effects: according to the coupling control system, each shaft continuously runs, so that sampling errors caused by vibration are reduced, and coupling efficiency is greatly improved; the invention integrates motion control and optical power acquisition, and the whole structure of the coupling equipment is simpler, so that the equipment cost is greatly reduced.
Description
Technical Field
The invention relates to a coupling control system and method for an optical communication laser component.
Background
Optical fiber communication is a communication system that transmits information via an optical fiber by using laser light as a carrier signal of the information. A typical digital optical communication system is shown in block diagram form in fig. 1, wherein the transmitter is referred to as a TOSA module and includes a laser generator assembly and a ferrule assembly. Laser generator assemblies are devices that convert electrical signals into optical signals. The laser is focused by the lens and then emitted to the ferrule assembly, and then the ferrule assembly transmits the laser into an external optical fiber. When the light through hole at the center of the ceramic of the ferrule assembly is superposed on the laser generation focus, the power is maximum. Such an assembly position is the optimum position for the entire TOSA module. And welding the plug core end and the laser transmitter end together through the transition fault to obtain a finished product.
The process of the TOSA module finding the best solder joint location is referred to as coupling in production (coupling is hereinafter used to represent this process). The coupling modes in the industry are mostly as follows: the end of the core inserting piece is fixed on a carrier capable of moving in the Z direction, and the laser emitting end is placed on a platform capable of moving in the XY direction; the optical fiber is connected into the TOSA module and introduced into the optical power meter. This allows finding the best position in three-dimensional space. The X, Y and Z directional axes and the optical power meter are abstracted to a software program through hardware drive and software drive, and then the optimal position is quickly found through various algorithms. There is a significant delay in acquiring software program data from commercially available optical power meters and motor shaft hardware drives. There is a delay, approximately about 10ms, for each acquisition point when the hardware data is read. When the three axes X, Y and Z move, the machine still waits for about 10ms because of the vibration of the machine. A large number of coordinate points need to be collected during coupling, and the efficiency is extremely low.
The existing coupling block diagram is shown in fig. 2, and four links of ABCD are required. The motor is a motion control card, generally a PCI bus. The optical power acquisition card generally has a certain time delay when being bought in a market, and if the time delay exists, the motor shaft moves to an acquisition coordinate and only stops waiting, and the mechanical vibration is caused when the motor shaft stops waiting. This creates a sampling delay. Therefore, the existing coupling method requires a lot of waiting time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a coupling control system and method for an optical communication laser component, aiming at improving the coupling efficiency and changing the traditional coupling mode.
The technical scheme adopted by the invention is as follows: a coupling control system of an optical communication laser component comprises a main control MCU, and a motion control module and an optical power acquisition module which are respectively connected with the main control MCU, wherein the main control MCU is connected with an upper computer through an Ethernet interface; the main control MCU receives a coupling command sent by the upper computer, and sends a moving command to the motion control module to drive the motor shaft to move, and the main control MCU sends coordinate data read from the motion control module and optical power data read from the optical power acquisition module to the upper computer.
The invention also provides a coupling control method of the optical communication laser component, which comprises the following steps:
step one, an upper computer sends a coupling command to a coupling system;
secondly, decoding the coupling command by the coupling system main control MCU to obtain a coupling parameter, calculating a target position of the motor shaft to be moved according to the coupling parameter, and then sending a movement command to the movement control module to drive the motor shaft to move;
step three, the main control MCU circularly reads the coordinate position and the power value and records the coordinate position and the power value to a memory space, and the coupling sampling is finished until the motor shaft reaches the target position;
and step four, the main control MCU sends the sampling data recorded in the memory space to the upper computer through the Ethernet interface.
Compared with the prior art, the invention has the following positive effects:
according to the coupling control system, each shaft continuously runs, so that sampling errors caused by vibration are reduced, and coupling efficiency is greatly improved; the invention integrates motion control and optical power acquisition, and the whole structure of the coupling equipment is simpler, so that the equipment cost is greatly reduced. The invention effectively overcomes the following defects of the existing coupling mode: in the coupling process, continuous waiting and acquisition are needed, and the coupling is very discontinuous; and because the coupling shaft is continuously started and stopped, the mechanical vibration is large, the obtained data often has large errors, and the industrial production process is extremely unfavorable.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of a typical digital optical communication system;
FIG. 2 is a block diagram of a prior art TOSA module coupling;
FIG. 3 is a block diagram of the configuration and flow of the coupling control system of the present invention;
FIG. 4 is a circuit diagram of an optical power harvesting module of the present invention;
fig. 5 is a schematic diagram of the operation of the coupling control system of the present invention.
Detailed Description
The optical communication laser assembly coupling control system takes a printed circuit board as a carrier, and the system composition is shown in figure 3 and comprises the following components: the device comprises a motion control module 1, a master control MCU 2, a 100M Ethernet interface 3, an optical power acquisition module 4 and the like, wherein the master control MCU 2 is respectively connected with the motion control module 1, the 100M Ethernet interface 3 and the optical power acquisition module 4.
And the motion control module 1 receives the movement command sent by the main control MCU 2, drives the motor shaft and manages the coordinate data of the current shaft.
The master control MCU 2 is used for coordinating system work and comprises: reading coordinate data of a current axis from the motion control module 1; reading the optical power from the optical power acquisition module 4; and receiving a coupling command sent by the upper computer through the 100M Ethernet interface 3 or sending coupling result data back to the upper computer.
The 100M ethernet interface 3 is used for transceiving commands and data.
The optical power acquisition module 4 converts analog quantity into digital quantity by adopting an APD (avalanche photodiode) photocurrent conversion circuit.
The circuit structure of the optical power acquisition module is shown in fig. 4, the APD chip is used for converting the optical intensity into a linear photocurrent Id, the operational amplifier in the figure is a typical transconductance amplifier circuit, Vo is Id Rf, and the optical intensity is converted into a linear relationship with Vo again. The Vo is connected with the ADC of the SPI interface; the master control MCU reads the ADC value through the SPI interface. To this end, the software layer obtains light intensity data.
The optical communication laser assembly coupling control system integrates the movement axis control and the optical power acquisition into one system, so that XYZ coordinates and corresponding optical power can be obtained simultaneously, a motor shaft can move continuously, and the optical power on a shaft track can be recorded in real time; according to the invention, through establishing the corresponding relation between the acquired coordinates and the optical power, the error is within an acceptable range, and the coupling efficiency can be greatly improved.
The working principle and the flow chart of the coupling control system of the optical communication laser component are shown in fig. 5, the upper computer sends a coupling command, and the system performs coupling: after receiving the coupling command, the MCU controls the motion chip to continuously move to a designated position; when the axis moves, the MCU continuously acquires the coordinate value of the motion chip, simultaneously acquires the digital quantity converted by the APD, stores the data into the MCU memory, and sends the coupling result data back to the upper computer through the Ethernet after the data is finished.
The specific flow of the optical communication laser component coupling control system is as follows:
1. the coupling system works in an upper computer and lower computer mode, namely, the upper computer sends a coupling command to the lower computer coupling system; the coupling system decodes the command to obtain the corresponding coupling parameter. The coupling parameters are: coupling axis number, step pitch, step number, etc. Wherein, the step distance is a coupling precision control parameter, such as: the optical power distribution state step pitch of 1um is 1 um. In actual coupling, the coupling accuracy may vary according to specific requirements.
2. And the coupling system MCU calculates the position of the target to be moved according to the step pitch and the step number. The conversion of the analog circuit has time delay, and each sampling point is subjected to averaging processing for 20 times on the basis of hardware with the ADC sampling rate of 500kHZ, wherein one sampling period is 0.15 mS. One step guarantees 3 samples, so one step is 0.45 ms. Calculating the running speed of the shaft according to a step pitch of 0.45 ms; and applying for a memory space with a proper size, and storing a coordinate power list result to be coupled out. The motion control module communication is a 16-bit parallel interface. Data was exchanged once at 25 uS.
3. Step 1 and step 2 have already calculated and prepared the parameter, MCU command movement control module move axis to step 2 calculated goal position, start speed 0, the running speed is step 2 calculated running speed, the acceleration time is 0.1S. The slow start here is to reduce mechanical shock and to make the power sampling more accurate. Then the position of the shaft has now been changed continuously until the target position is reached. And the MCU runs at full speed, circularly reads the coordinate position and the power value, and records the coordinate position and the power value to a memory space. The sequential logic of one sampling point is recorded as: and reading the current shaft position, sampling the current light power value, and reading the current shaft position again. And averaging the first axial position and the second axial position, and recording as a sampling coordinate. And when the MCU detects that the shaft reaches the target position, the coupling sampling is finished.
4. The MCU sends the data recorded by the memory to the upper computer through the Ethernet, and the upper computer performs mathematical fitting according to the current data points.
Claims (10)
1. An optical communication laser assembly coupling control system, characterized by: the device comprises a main control MCU, and a motion control module and an optical power acquisition module which are respectively connected with the main control MCU, wherein the main control MCU is connected with an upper computer through an Ethernet interface; the main control MCU receives a coupling command sent by the upper computer, and sends a moving command to the motion control module to drive the motor shaft to move, and the main control MCU sends coordinate data read from the motion control module and optical power data read from the optical power acquisition module to the upper computer.
2. The optical communication laser assembly coupling control system of claim 1, wherein: the optical power acquisition module adopts an APD chip to convert light intensity into linear photocurrent.
3. The optical communication laser assembly coupling control system of claim 2, wherein: and the optical power acquisition module converts the light intensity into a linear relation with Vo again by adopting a transconductance operational amplification circuit.
4. The optical communication laser assembly coupling control system of claim 3, wherein: and the Vo is connected with the ADC of the SPI interface.
5. The optical communication laser assembly coupling control system of claim 4, wherein: and the master control MCU is connected with the optical power acquisition module through the SPI interface.
6. A method for controlling coupling of an optical communication laser module, comprising: the method comprises the following steps:
step one, an upper computer sends a coupling command to a coupling system;
secondly, decoding the coupling command by the coupling system main control MCU to obtain a coupling parameter, calculating a target position of the motor shaft to be moved according to the coupling parameter, and then sending a movement command to the movement control module to drive the motor shaft to move;
step three, the main control MCU circularly reads the coordinate position and the power value and records the coordinate position and the power value to a memory space, and the coupling sampling is finished until the motor shaft reaches the target position;
and step four, the main control MCU sends the sampling data recorded in the memory space to the upper computer through the Ethernet interface.
7. The optical communication laser assembly coupling control method of claim 6, wherein: the coupling parameters comprise coupling shaft number, step pitch and step number.
8. The optical communication laser assembly coupling control method of claim 6, wherein: when the conversion of the analog circuit is delayed, each sampling point is processed by an average value of 20 times on the basis of hardware with the ADC sampling rate of 500kHZ, wherein one sampling period is 0.15mS, and one step is ensured to sample for 3 times.
9. The optical communication laser assembly coupling control method of claim 6, wherein: the motion control module adopts a 16-bit parallel interface for communication, and the time for exchanging data once is 25 uS.
10. The optical communication laser assembly coupling control method of claim 6, wherein: the sequential logic for recording a sample point is: and reading the current coordinate position of the motor shaft, sampling the current optical power value, reading the current coordinate position of the motor shaft again, and recording the average value of the two coordinate positions as the sampling coordinate of the motor shaft.
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| CN202111479763.5A CN114200605A (en) | 2021-12-06 | 2021-12-06 | Optical communication laser assembly coupling control system and method |
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| CN202111479763.5A CN114200605A (en) | 2021-12-06 | 2021-12-06 | Optical communication laser assembly coupling control system and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508344A (en) * | 2011-11-30 | 2012-06-20 | 成都储翰科技有限公司 | Automatic coupling device for semiconductor laser diode and implementation method for automatic coupling device |
| CN102768389A (en) * | 2012-07-31 | 2012-11-07 | 青岛海信宽带多媒体技术有限公司 | Light active coupling system and method of optical module |
| CN112595916A (en) * | 2020-12-22 | 2021-04-02 | 安徽地势坤光电科技有限公司 | Beam-combining optical fiber laser module aging detection device and detection method |
| CN112987197A (en) * | 2021-02-22 | 2021-06-18 | 李建该 | Optical device automatic coupling system based on FPGA and data acquisition method thereof |
| CN216387486U (en) * | 2021-12-06 | 2022-04-26 | 四川光恒通信技术有限公司 | Coupling control system for optical communication laser assembly |
-
2021
- 2021-12-06 CN CN202111479763.5A patent/CN114200605A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508344A (en) * | 2011-11-30 | 2012-06-20 | 成都储翰科技有限公司 | Automatic coupling device for semiconductor laser diode and implementation method for automatic coupling device |
| CN102768389A (en) * | 2012-07-31 | 2012-11-07 | 青岛海信宽带多媒体技术有限公司 | Light active coupling system and method of optical module |
| CN112595916A (en) * | 2020-12-22 | 2021-04-02 | 安徽地势坤光电科技有限公司 | Beam-combining optical fiber laser module aging detection device and detection method |
| CN112987197A (en) * | 2021-02-22 | 2021-06-18 | 李建该 | Optical device automatic coupling system based on FPGA and data acquisition method thereof |
| CN216387486U (en) * | 2021-12-06 | 2022-04-26 | 四川光恒通信技术有限公司 | Coupling control system for optical communication laser assembly |
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