CN116388866A

CN116388866A - Device and method for adjusting optical power of device on optical module

Info

Publication number: CN116388866A
Application number: CN202310653997.XA
Authority: CN
Inventors: 王苗庆; 黄成龙; 罗声静; 俞国平; 傅家奇
Original assignee: Shaoxing Zktel Equipment Co ltd
Current assignee: Shaoxing Zktel Equipment Co ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-07-04
Anticipated expiration: 2043-06-05
Also published as: CN116388866B

Abstract

The invention relates to a device and a method for adjusting the optical power of a device on an optical module, comprising a power-on plate, a dimming clamp, an optical power meter and a laser welding device; the dimming clamp is used for clamping the optical module to be adjusted, and is provided with an APC (automatic control) circuit which is used for being electrically connected with the optical module to be adjusted so as to realize the luminescence of the optical module; the power-on plate is used for introducing a power supply to supply power, a control unit and a laser driver are arranged on the power-on plate, and the laser driver assigns a value to the APC control circuit according to a control signal of the control unit; the optical power meter is used for monitoring the output power of the optical module to be adjusted; the laser welding equipment is used for emitting laser to the optical module to be adjusted to realize optical power adjustment; the advantages are that: the traditional mode of modulating current through a module is abandoned, the size of the light power is adjusted by combining the light-emitting light path offset of the device, and then the light power is adjusted by matching with the APC circuit of the module, so that the dimming range is larger, and the requirement of larger power span is met.

Description

Device and method for adjusting optical power of device on optical module

Technical Field

The present invention relates to the field of optical module testing, and in particular, to an apparatus and a method for adjusting optical power of a device on an optical module.

Background

The manner in which the current conventional optical module and BOB device adjust the optical power is described in patent 201410287200.X, comprising the following steps:

the method comprises the steps that firstly, a PC machine is connected with an optical power meter through an RS232 bus serial port, is connected with an optical module test board through a USB connection line, and an emitter interface of an optical module is connected with the optical power meter through an optical fiber jumper wire to form a debugging system;

setting a wavelength setting value of an optical power meter as a wavelength of a transmitter of a tested module and a tolerance value of optical power transmitted by the transmitter, and enabling a micro control unit MCU of the optical module to give an initial value slightly larger than a minimum current provided by a bias current controller by an optical power automatic debugging software calculation program;

and thirdly, the optical power automatic debugging software of the optical module reads an indication value of an optical power meter through an RS232 bus, and makes a difference between the obtained optical power value of the transmitter and the target optical power value of the transmitter, if the difference is smaller than a preset tolerance range of the optical transmitter, the debugging is judged to be successful, and if the difference is larger than the preset deviation tolerance range of the optical power of the optical transmitter, the debugging is continued.

The principle of the scheme is shown in fig. 1 and 2: when the working current I exceeds the threshold current ITH of the laser, the optical power P changes linearly with the current, which is a theoretical basis for the optical power P to be adjustable, and for the optical module, the working current i=bias current ibias+modulation current IMOD of the optical module; when the optical power needs to be adjusted, the microprocessor MCU enables the laser driver to drive the laser to give corresponding values of the bias current IBIAS and the modulation current IMOD by calling the corresponding relation table, so that the change of the optical power is realized.

When the optical module still cannot adjust the device to the target power by using the mode, the device with the diode is detached, the single beam correction light path at the device end is carried out, the power is adjusted from the laser end, and the module is assembled again after the adjustment.

In summary, the existing solutions have the following drawbacks:

1. the influence of the laser is great, if the slope SE of the luminous power PO of the laser is too small or too large, the current can be required to be great by adjusting the IBIAS current and the IMOD, so that the service life of the laser can be shortened, and the power resource is wasted; the current can be adjusted to be lower than the ITH value of the device, so that the current is too small and is no longer in the linear working area of the laser, and the working state of the module is unstable;

2. the bias current of the general optical module is in the range of 10% -20% of the rated current, the traditional APC circuit is used for adjusting the APC value and the APD value, the requirement of such a large power span cannot be met, only devices with various gears can be purchased for implementation, and then different optical module product types and models are needed. However, the optical module has various products due to different optical power, and many applications only have different optical power and different transmission distances, so that inconvenience is brought to management and exchange period;

3. when the laser has abnormal power or power drop value due to poor device reliability, the traditional method is used for adjusting the power again, so that overload protection (too large modulation current) is easily caused;

4. when the module end can not adjust power through the APC automatic circuit, only the device with the laser diode can be detached to carry out single-beam correction light path for the device end, but the device has lost pins at the moment, whether the module is detached to the subsequent reassembly or the single-beam repair welding of the device end, the efficiency is very affected, the time cost is very high, and only the scrapped device is selected at the moment.

Based on this, the present application is hereby proposed.

Disclosure of Invention

The invention aims to provide equipment for adjusting the optical power of a device on an optical module, which is used for discarding the traditional mode of modulating current by the module to adjust the power, combining the light-emitting light path offset of the device to adjust the optical power, and then matching with an APC circuit of the module to adjust, so that the dimming range is larger, and the requirement of larger power span is met.

In order to achieve the above object, the technical scheme of the present invention is as follows:

an apparatus for adjusting the optical power of a device on an optical module comprises a power-on plate, a dimming fixture, an optical power meter and a laser welding apparatus;

the dimming clamp is used for clamping the optical module to be adjusted, and is provided with an APC (automatic control) circuit which is used for being electrically connected with the optical module to be adjusted so as to realize the luminescence of the optical module; the APC control circuit comprises a socket for connecting with a circuit board of the optical module to be adjusted; the dimming clamp comprises a frame, wherein the frame is provided with a clamp and a clamp driving part, and the clamp driving part is used for driving the clamp to complete clamping and releasing actions so as to clamp an optical module to be adjusted;

the power-on board is used for introducing a power supply to supply power, a control unit and a laser driver are arranged on the power-on board, and the laser driver assigns a value to the APC control circuit according to a control signal of the control unit;

the optical power meter is used for monitoring the output power of the optical module to be adjusted;

the laser welding equipment is used for emitting laser to the optical module to be adjusted, so that the optical path of a device on the optical module to be adjusted is deviated, and the adjustment of optical power is realized.

Further, the clamp comprises an upper clamping plate and a lower clamping plate, a base groove is formed in the upper clamping plate, and the APC control circuit is fixed on the lower clamping plate.

Further, the clamp is fixed at the action end of the clamp driving part, a rotating shaft is connected to the frame through a bearing, a rotating disc fixed with the clamp driving part is arranged at one end of the rotating shaft, and a rotating shaft driving part is arranged at the other end of the rotating shaft.

The adjustable base comprises a bottom plate, a middle plate and a top plate, wherein a first sliding shaft is arranged on the bottom plate, a first sliding seat is connected to the first sliding shaft in a sliding manner, the middle plate is fixed on the first sliding seat, a second sliding shaft is arranged on the middle plate, a second sliding seat is connected to the second sliding shaft in a sliding manner, and the top plate is fixed on the second sliding seat; the arrangement directions of the first sliding shaft and the second sliding shaft are mutually perpendicular, and the power-on plate and the dimming clamp are fixed on the top plate.

Further, handles which are convenient for sliding operation are arranged on the middle plate and the top plate.

The second object of the present invention is to provide an adjustment method for an apparatus for adjusting optical power of a device on an optical module, comprising the steps of:

s1, determining the initial value which needs to be given to an APC control circuit by a power-up plate according to the type of an optical module to be adjusted;

s2, removing the shell of the optical module to be adjusted to expose the device;

s3, clamping the optical module with the shell removed into a dimming clamp, and simultaneously connecting a circuit board of the optical module to be adjusted with an APC control circuit;

s4, electrifying, wherein the optical module normally emits light and emits light for a long time;

s5, connecting an optical power meter with the optical module to be adjusted;

s6, opening the laser welding equipment, adjusting the optical power of the exposed optical module in a single-beam mode, rotating the optical module to be adjusted through a rotating clamp, and performing repair welding on the corresponding welding spots by using a single-beam;

s7, after adjustment is finished, a module shell is installed, and circuit optical power at the module end is matched for debugging.

Furthermore, the given initial value needs to ensure that the laser of the optical module to be adjusted cannot trigger the safety protection circuit to turn off the bias current, and meanwhile, needs to ensure that the APC control circuit has debugging allowance.

Further, the optical power adjustment in step S6 includes the steps of:

the method comprises the steps of P1, detecting whether the optical power of an optical module to be adjusted is in a specified range, if so, ending an adjustment step, and judging that the optical module is qualified; if not, entering a step P2;

p2, monitoring whether the number of laser repair welding is more than or equal to 5, if so, ending the adjustment step, and judging that the optical module is unqualified; if not, carrying out single-beam repair welding, and returning to the step P1 after repair welding.

The invention has the advantages that:

1. the traditional mode of modulating current through a module is abandoned, the size of the light power is adjusted by combining the light-emitting light path offset of the device, and then the light power is adjusted by matching with the APC circuit of the module, so that the dimming range is larger, and the requirement of larger power span is met;

2. when the module is regulated to the corresponding target power, the APC value or IMOD current is found to be larger, the service life of the device is worried about being influenced, the module can be directly taken out, and the regulated power is ensured to be at the most suitable position;

3. the problem that when the power span is large, devices with different power gears need a plurality of different power devices is solved, and only one high-power product is needed, the fine division adjustment of the work doing rate is realized on the equipment, so that the production efficiency of a module end is improved;

4. the device can be directly adjusted under the conditions of not disassembling the device, not repeatedly disassembling and assembling and not welding pins, and the device can be "saved" at the moment.

Drawings

FIG. 1 is a schematic diagram of the optical power in the prior art with the current;

FIG. 2 is a schematic block diagram of a prior art solution;

FIG. 3 is a schematic block diagram of an embodiment;

FIG. 4 is a schematic view showing the constitution of the apparatus in the embodiment;

FIG. 5 is a schematic view of a three-dimensional configuration of a dimming fixture in an embodiment;

FIG. 6 is a schematic cross-sectional view of FIG. 5;

FIG. 7 is a schematic view of the three-dimensional structure of FIG. 5 from another perspective;

fig. 8 is a schematic view showing a three-dimensional construction of upper and lower clamping plates of the dimming clamp in the embodiment;

fig. 9 is a schematic view showing a state in which the optical module device base is clamped in the upper clamping plate in the embodiment;

FIG. 10 is a schematic diagram of an optical power adjustment step of the device according to the embodiment;

description of the reference numerals

1-a power-on plate;

2-dimming clamp, 201-frame, 202-upper clamping plate, 203-lower clamping plate, 204-clamp driving part, 205-base groove, 206-bearing, 207-rotating shaft, 208-rotating shaft driving part, 209-rotating disc;

3-an optical power meter; 4-a laser welding device;

5-APC control circuit, 501-socket;

6-adjustable base, 601-bottom plate, 602-middle plate, 603-top plate, 604-slide first, 605-slide first, 606-slide second, 607-slide second, 608-handle;

701-base, 702-fiber optic adapter.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like herein indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The present embodiment proposes an apparatus for adjusting the optical power of a device on an optical module, which is mainly composed of four parts, as shown in fig. 3 and 4, including a power-up plate 1, a dimming fixture 2, an optical power meter 3, and a laser welding apparatus 4. The dimming clamp 2 is used for clamping an optical module to be adjusted, and is provided with an APC (automatic Power control) circuit 5, wherein the APC control circuit 5 is used for being electrically connected with the optical module to be adjusted to realize the luminescence of the optical module; the power-on board 1 is used for introducing a power supply to supply power, and is provided with a control unit and a laser driver, wherein the laser driver assigns a value to the APC control circuit 5 according to a control signal of the control unit; the optical power meter 3 is used for monitoring the output power of the optical module to be adjusted; the laser welding device 4 is used for emitting laser to the optical module to be adjusted, so that the optical path of a device on the optical module to be adjusted is deviated, and the optical power adjustment is realized.

As shown in fig. 5, the dimming fixture 2 includes a frame 201, and a fixture driving section 204 are provided on the frame 201. The clamp driving part 204 adopts a double-claw finger cylinder, two clamping jaws of the double-claw finger cylinder can perform vertical lifting motion, an upper clamping plate 202 is fixed on the clamping jaw positioned at the upper part, a lower clamping plate 203 is fixed on the clamping jaw positioned at the lower part, the upper clamping plate 202 and the lower clamping plate 203 form the clamp, and the clamp can ensure that devices are always clamped in the process of rotating and beating a single beam, so that the stability of the devices is ensured. As shown in fig. 8 and 9, the upper clamping plate 202 is provided with a base groove 205 for accommodating a device base 701 of an optical module to be adjusted, the lower clamping plate 203 is fixed with the APC control circuit 5, and the APC control circuit 5 includes a socket 501 for connecting to a circuit board of the optical module to be adjusted. As shown in fig. 6, a rotating shaft 207 is connected to the stand 201 through a bearing 206, one end of the rotating shaft 207 is provided with a turntable 209 fixed to the fixture driving part 204, and the other end is provided with a rotating shaft driving part 208, in this embodiment, the rotating shaft 207 is manually driven, so the rotating shaft driving part 208 adopts a handle shape, a user can conveniently rotate the rotating shaft 207, and the rotating shaft 207 realizes 360-degree rotation of the optical module to be adjusted through the turntable 209, the fixture driving part 204 and the fixture, so that the device can fully receive a single beam.

Further, the APC control circuit 5 includes a mounting base, a slotted hole is formed in the mounting base along the length direction of the lower plate 203, a through hole is formed in the lower plate 203, a fixing bolt (not shown in the figure) for fixing the mounting base on the lower plate 203 is formed in the through hole, and fine adjustment can be achieved on the position of the APC control circuit 5 on the lower plate 203 due to the action of the slotted hole, so as to adapt to different types of optical modules.

The power-on board 1 is a PCB board, on which an MCU control unit and a laser driver are arranged, one end of the PCB board is connected with a 12V power supply through a wire, and the other end is connected with an optical module end which needs to adjust optical power through an APC control circuit 5. After power-on, the MCU control unit of the PCB can give an initial value to the APC control circuit 5, so that the module can emit light for a long time. The initial value is usually smaller, so that the laser with larger luminous efficiency cannot trigger the safety protection circuit to turn off the bias current, the laser does not have light output, and more debugging allowance is reserved for the APC control circuit 5.

The optical power meter 3 is connected with the optical fiber output end of the optical module to be adjusted through a jumper wire to monitor the output power of the long light-emitting module, and judges that the product is qualified when the ideal light-emitting power is reached.

The laser welding apparatus 4 (also referred to as a laser beam apparatus) can emit a single laser beam through the apparatus and strike the device of the module to be dimmed (specifically, the position is shown as a fiber adapter 702 in fig. 9), thereby adjusting the optical path so that the optical power reaches a desired range.

As shown in fig. 5 to 7, the apparatus further includes an adjustable base 6, where the adjustable base 6 includes a bottom plate 601, a middle plate 602, and a top plate 603, the bottom plate 601 is provided with a first sliding shaft 604, the first sliding shaft 604 is slidably connected with a first sliding seat 605, the middle plate 602 is fixed on the first sliding seat 605, the middle plate 602 is provided with a second sliding shaft 606, the second sliding shaft 606 is slidably connected with a second sliding seat 607, and the top plate 603 is fixed on the second sliding seat 607; the first slide shaft 604 and the second slide shaft 606 are arranged in directions perpendicular to each other, and the power-on plate 1 and the dimming fixture 2 are fixed on the top plate 603. The middle plate 602 and the top plate 603 are also provided with handles 608 which facilitate sliding operation. Through setting up adjustable base 6, conveniently adjust light fixture 2 and carry out bi-directional horizontal position and adjust, the going on of the light power adjustment process of being convenient for.

The method for adjusting the optical module to be tested by the equipment comprises the following steps:

s1, confirming the integrity of an optical fiber system, wherein each line is connected in place; according to the type of the optical module to be adjusted, determining the initial value to be given to the APC control circuit 5 by the power board 1, for example, in this embodiment, the APC adjustment value is 0-255, the power to be adjusted is-4-0 dbm, at this time, we preset the driving APC value in the PCB board to be 150 (150 value is centered to be lower, and can be set according to the user requirement in practice, so as to ensure that the safety protection circuit of the laser with larger luminous efficiency will not be triggered to turn off the bias current, thereby leading to no light output of the laser, and meanwhile, in order to ensure that more debugging allowance is left in the APC control circuit 5), the ADC value of the module is fixed correspondingly;

s3, clamping the optical module with the shell removed into the dimming clamp 2, and simultaneously connecting a circuit board of the optical module to be adjusted with the APC control circuit 5;

s4, a 12V power supply is turned on, and the optical module normally emits light and emits light for a long time;

s5, connecting the optical power meter 3 with the optical module to be adjusted, and visually watching a specific optical power value, wherein the initial test power value is-6 dBm after the initial APC value is given in the embodiment;

s6, opening the laser welding equipment 4, adjusting the optical power of the bare optical module in a single-beam mode, rotating the optical module to be adjusted through a rotating clamp, and performing repair welding on the corresponding welding spots by using a single-beam mode; in this embodiment, when the scheme of the invention is used, the light power is generally adjusted to an ideal range of-2 to-0.5 dBm, and in practical application, the light power is only adjusted to a value close to the range of the light module power, because after the power of the module is adjusted by using the scheme of the invention, the module can be re-loaded on the board to burn an APC automatic dimming circuit program once, and the range of the re-burned APC value is wider;

s7, after adjustment, installing a module shell, and matching with circuit optical power debugging at the module end to enable the power of the module to quickly return to the target range (because the scheme of the embodiment is that the optical module always emits light, and the potentiometer value of long light is a central value, for example, the potentiometer value range is 0 to 255, generally, 150 is fixed to adjust, and the module is then loaded to the module after adjustment, and is then loaded again, so that the module can easily reach the target range at the moment); the optical power debugging of the circuit at the module end uses other ready-made equipment, and is not described herein.

In the above step S6, the optical power adjustment includes the steps of:

Due to the differences of the bias current controller, the bias current control precision and the optical devices, the single-beam power adjustment can be successfully performed without once, and the target value is gradually approached after repeated times. And adding an upper limit for 5 times to judge that the optical module is not qualified if the device power cannot be within the range for more than 5 times.

The above embodiments are only for illustrating the concept of the present invention and not for limiting the protection of the claims of the present invention, and all the insubstantial modifications of the present invention using the concept shall fall within the protection scope of the present invention.

Claims

1. The device for adjusting the optical power of the device on the optical module is characterized by comprising a power-on plate, a dimming clamp, an optical power meter and a laser welding device;

2. The apparatus for adjusting optical power of a device on an optical module as claimed in claim 1, wherein the jig comprises an upper jig plate having a base groove and a lower jig plate having the APC control circuit fixed thereto.

3. The apparatus for adjusting optical power of device on optical module as defined in claim 1, wherein the fixture is fixed at an actuating end of the fixture driving part, a rotating shaft is connected to the frame through a bearing, one end of the rotating shaft is provided with a turntable fixed to the fixture driving part, and the other end is provided with a rotating shaft driving part.

4. The device for adjusting optical power of a device on an optical module according to claim 1, comprising an adjustable base, wherein the adjustable base comprises a bottom plate, a middle plate and a top plate, the bottom plate is provided with a first sliding shaft, the first sliding shaft is connected with a first sliding seat in a sliding manner, the middle plate is fixed on the first sliding seat, the middle plate is provided with a second sliding shaft, the second sliding shaft is connected with the second sliding seat in a sliding manner, and the top plate is fixed on the second sliding seat; the arrangement directions of the first sliding shaft and the second sliding shaft are mutually perpendicular, and the power-on plate and the dimming clamp are fixed on the top plate.

5. An apparatus for adjusting optical power of a device on an optical module as defined in claim 4, wherein handles for facilitating sliding operation are provided on the middle plate and the top plate.

6. A method of adjusting an apparatus for adjusting the optical power of a device on an optical module according to any one of claims 1 to 5, comprising the steps of:

s5, connecting an optical power meter with the optical module to be adjusted;

7. The method of adjusting optical power of a device on an optical module according to claim 6, wherein the initial value is given to ensure that a laser of the optical module to be adjusted does not trigger a safety protection circuit to turn off a bias current, and to ensure that an APC control circuit has a debug margin.

8. The method for adjusting the optical power of the device on the optical module as claimed in claim 6, wherein the optical power adjustment in step S6 comprises the steps of: