CN104880769B - A kind of optical branching device is coupled and aligned the parallel method of adjustment in face - Google Patents

Abstract

It is coupled and aligned the parallel method of adjustment in face the invention discloses a kind of optical branching device, first PLC chip is fixed, then allow FA to rotate an angle and collide PLC chip, then rotate an angle in the opposite direction again and collide PLC chip, then the displacement transducer displacement according to caused by colliding twice calculates nonparallelism of the FA relative to PLC chip, finally according to result of calculation respectively on vertical and horizontal direction respectively to the rational deflection voltage rotation FA of stepper motor one so that 8 degree of light pass surfaces of PLC chip and FA 8 degree of light pass surfaces are parallel.And the present invention can by it is complete using automatically controlling in a manner of realize the regulation of relevant device, can effectively prevent to think or FA quality problems itself caused by can not accurately adjust the problem of face is parallel.

Description

A Method for Adjusting the Parallel Coupling and Alignment Surfaces of an Optical Splitter

technical field

The present invention relates to the technical field of light guide communication, in particular, it relates to a method for adjusting the parallel alignment of coupling and alignment planes of optical splitters, which is mainly used for quickly judging the coupling and alignment of optical splitters in PLC (Planar Lightwave Circuit Splitter, Planar Lightwave Circuit Splitter, Planar Lightwave Circuit Splitter) Waveguide splitter) Chip 8-degree light-passing surface and FA (Fiber Array, fiber array) 8-degree light-passing surface parallel status, and then quickly adjust the FA position according to the judgment result so that the 8-degree light-passing surface of the PLC chip and the FA The 8-degree light-passing planes are parallel to ensure coupling insertion loss.

Background technique

In recent years, with the rapid growth of IP services, the demand for network bandwidth is getting higher and higher, and the traditional analog telecommunications technology has been unable to meet people's needs. The subsequent optical communication network has become a hot spot in the development of global communication networks. To develop the optical network, we must first establish an optical passive distribution network with a wide coverage. To build an optical passive distribution network, a large number of optical splitters must be used. As the demand for optical splitters continues to grow, China has become the world's largest producer of optical splitters.

For the production of splitters, the relative position of the PLC chip and FA is basically adjusted by manually adjusting the 6-dimensional adjustment frame, and then by observing the images of the PLC chip and FA on the screen to judge whether they are parallel, and then make corresponding adjustments. Finally, fine-tune the alignment of the waveguide and the core of the FA through the adjustment frame, where the positions of the FA and the PLC chip are imaged on the display screen through the rear CCD (Charge-coupled Device, charge-coupled device) and the upper CCD, as shown in Figure 1 Show.

During the whole process, if the PLC chip and the 8-degree surface of the FA cannot be effectively adjusted to be parallel at the beginning, the coupling loss will not be able to be adjusted to meet the specification requirements in the end. As shown in Figure 2, two 8-degree light-transmitting surfaces (101 and 102) need to be manually adjusted to be parallel. To ensure that planes 101 and 102 are parallel, the angles in the horizontal and vertical directions must be parallel. As shown in Figure 3, the vertical direction is parallel, and as shown in Figure 4, the horizontal direction is parallel. If the two surfaces are not adjusted to be parallel, there will be dislocation and unevenness as shown in Figure 5, vertical unevenness as shown in Figure 6, and horizontal inequality as shown in Figure 7.

In actual operation, it is difficult to avoid edge chipping and small edge collapse during the FA grinding process, which is displayed as a shadow on the monitor. It is very difficult to judge with the naked eye whether the 8-degree surface of the PLC chip is parallel to the 8-degree surface of the FA. At the same time, due to the inconsistency between the width of the PLC chip and the width of the FA, the edge of the PLC chip (Lu line) and the edge of the FA (Ld line) are not on the same focal plane when observed by the rear CCD, so the rear CCD cannot clearly observe the edge of the PLC chip and the FA at the same time , specifically as shown in Figure 8.

For optical splitter coupling alignment, if the coupling loss is required to be less than 0.1dB, the minimum angle error can be expressed as:

Min(θ) = (d / l) * (180 / π) ... (1)

Among them, d represents the coupling distance, and l represents the section length. For the single-fiber FA at the input end, the width, that is, the section length l is generally 2.5mm, and the coupling distance d is generally 5um, so the value can be substituted into the above formula to calculate: Min(θ) ≈ 0.1°; for the output end, the widest chip at present It is about 9mm, and its minimum angle error Min(θ) ≈ 0.03°. At the same time, the minimum angle that the trained human eye can distinguish is about 0.023°. It can be seen that it is theoretically difficult to judge the parallelism between the PLC chip and the FA with the naked eye.

Therefore, we can see that the following three factors will affect the judgment of the parallelism between the PLC chip and the FA during coupling: ①The resolution limit of the human eye makes it difficult to judge the parallelism of the plane, and the observation accuracy is low; ②The inconsistent width of the PLC chip and the FA leads to The two edges are not on the same focal plane, and the observation resolution is low; ③The edge collapse and collapse of the PLC chip or FA surface cause imaging shadows, which affect the observation.

Contents of the invention

In order to overcome the above-mentioned problems existing in the prior art, the present invention provides a novel concept, convenient adjustment, accurate observation, convenient and practical method for adjusting the parallel coupling and alignment planes of optical splitters.

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

A method for adjusting the parallel alignment of coupling and alignment surfaces of an optical splitter, comprising the following steps:

(S1) Install the fixed bracket and the six-dimensional automatic adjustment frame side by side on the calibration platform, install the PLC chip on the fixed bracket, and install the FA on the six-dimensional automatic adjustment frame, so that the 8-degree light between the PLC chip and the FA The face is in a positive relative position;

(S2) Preliminarily adjust the position of the FA to be roughly level with the PLC chip, and in a basic contact state; the so-called roughly level means that the position between the FA and the PLC chip directly observed by the naked eye has no obvious misalignment, and the end faces of the two have no obvious deviation. ;

(S3) Control the FA to rotate at an angle of ±α in the vertical direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to displace, and obtain the displacement value d11 corresponding to the forward rotation angle α and the displacement corresponding to the reverse angle -α valued12;

(S4) Judging whether the FA and the end face of the PLC chip are aligned in the vertical direction by the difference between the two displacement values d11 and d12, if not, adjust the corresponding rotation direction according to the positive or negative value of the difference and adjust the corresponding rotation angle according to the value of the difference to Align the FA and PLC chip end faces in the vertical direction;

(S5) Control the FA to rotate ±β angles in the horizontal direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to be displaced, and obtain the displacement value d21 corresponding to the forward rotation angle β and the displacement corresponding to the reverse rotation angle -β valued22;

(S6) Judging whether the FA and the end faces of the PLC chip are aligned in the horizontal direction by the difference between the two displacement values d21 and d22, if not, adjust the corresponding rotation direction according to the positive and negative values of the difference and adjust the corresponding rotation angle according to the value of the difference, to Align the FA and PLC chip end faces in the horizontal direction;

(S7) Make the two ends of the FA and the PLC chip, that is, the two 8-degree light-transmitting surfaces, parallel to each other by adjusting the alignment in the horizontal and vertical directions.

Specifically, the six-dimensional automatic adjustment frame in the step (S1) includes a base installed on the calibration platform, an X-axis adjustment mechanism installed on the base, and a Y-axis adjustment mechanism installed on the X-axis adjustment mechanism , the Z-axis adjustment mechanism installed on the Y-axis adjustment mechanism, the horizontal rotation adjustment mechanism installed on the Z-axis adjustment mechanism, the vertical rotation adjustment mechanism installed on the horizontal rotation adjustment mechanism, and the vertical rotation adjustment mechanism installed on the vertical direction Rotate the low-resistance slide rail on the adjustment mechanism, the FA installation table connected with the low-resistance slide rail, and the displacement sensor installed on the FA installation table. Among them, the X, Y, and Z axial adjustment mechanisms can be manually adjusted or electrically adjusted, and the horizontal and vertical direction rotation adjustment mechanisms are all driven by stepping motors. connected to the stepper motor.

The basic contact state between the PLC chip and the FA in the step (S2) is that the two 8-degree light-transmitting surfaces of the PLC chip and the FA are close to each other but not in contact, and the two 8-degree light-transmitting surfaces can collide with each other through one rotation state. In terms of apparent operation, when the PLC chip and FA are roughly equal, the position of the control FA is gradually approaching the position of the PLC chip, and the two seem to be in contact with the naked eye, but the FA is not touched to make the displacement sensor read.

In order to improve the detection accuracy, the angle α or/and β of the adjustment FA rotation is not greater than 3.6°, the purpose is to make the arc-shaped motion track length of the front end of the FA much smaller than the circumference of the rotation, so that the arc-shaped The motion trajectory is equivalent to a linear displacement, that is, half of the displacement difference generated by the two collisions, which is convenient for measurement and calculation, and the deviation θ between the two 8-degree light-transmitting surfaces of the FA and the PLC chip can be established with the two collisions. The functional relationship of the displacement difference, such as θ = f [(dx1-dx2)/2], x in dx1 and dx2 is the representation code of the horizontal and vertical directions.

In order to facilitate the adjustment, in the steps (S4) and (S6), the pre-established angle-displacement curve is used as a standard when adjusting the corresponding rotation angle according to the difference value. This is equivalent to calculating the relationship of the above-mentioned function f from the actual measurement data in advance.

Specifically, the angle-displacement curve is formulated according to the following steps:

(a) Set the two 8-degree light-transmitting surfaces of the PLC chip and the FA to be completely parallel and in contact with each other;

(b) Adjust the FA to make it deflect, and record the displacement value Δd when the FA is deflected by a specific subdivision degree ω;

(c) Make an angle-displacement curve based on the recorded data.

Wherein, the specific subdivision degree ω is greater than the deflection accuracy of the FA. Since the six-dimensional automatic adjustment frame is driven and deflected by a stepping motor, the specific subdivision degree ω is greater than the rotation accuracy of the stepping motor.

In order to better realize the driving of the stepping motor, in the step (b), the deflection voltage ΔV driving the stepping motor is simultaneously measured and recorded every time the FA deflects by a specific subdivision degree ω.

In addition, the angle-displacement-deflection voltage curve is formulated in the step (c), and the displacement value calculated from the difference value in the steps (S4) and (S6) obtains the corresponding deflection voltage through the curve to control the step The motor regulates the FA.

Compared with the prior art, the present invention has the following beneficial effects:

The invention adopts a fixed PLC chip, let the FA rotate an angle to collide with the PLC chip to obtain a displacement value, and then reversely rotate the same angle to collide with the PLC chip again to obtain another displacement value, and calculate the relative value of the FA relative to the PLC through the difference between the two displacement values The degree of non-parallelism of the chip, and finally control the stepper motor to rotate the FA according to the calculation result so that the two 8-degree light-transmitting surfaces of the FA and the PLC chip are parallel, and the present invention can fully adopt automatic control to realize the adjustment of the corresponding equipment, which can It effectively eliminates the problem of inability to accurately adjust the parallel planes caused by man-made or FA quality problems. It has a novel concept, unique perspective, ingenious design, simple and convenient operation, and has broad application prospects. It is suitable for popularization and application.

Description of drawings

Fig. 1 is a schematic diagram of parallel detection of FA and PLC in the prior art.

Figure 2 is a schematic diagram of FA and PLC and their 8-degree light-transmitting surfaces.

Fig. 3 is a schematic diagram of two 8-degree light-transmitting surfaces of FA and PLC parallel in the vertical direction.

Fig. 4 is a schematic diagram of two 8-degree light-transmitting surfaces of FA and PLC parallel in the transverse direction.

Fig. 5 is a schematic diagram of the dislocation and unevenness of two 8-degree light-transmitting surfaces of FA and PLC.

Fig. 6 is a schematic diagram of vertical unevenness of two 8-degree light-transmitting surfaces of FA and PLC.

Fig. 7 is a schematic diagram of unevenness in the transverse direction of two 8-degree light-transmitting surfaces of FA and PLC.

FIG. 8 is a schematic diagram of edge inconsistencies between FA and PLC.

FIG. 9 is a schematic structural diagram of related equipment used on the calibration platform in the present invention.

Fig. 10 is a schematic structural diagram of related equipment used on the calibration platform in the present invention.

detailed description

The present invention will be further described below with reference to the accompanying drawings and examples, and the embodiments of the present invention include but not limited to the following examples.

Example

The method for adjusting the parallel alignment of the coupling alignment plane of the optical splitter comprises the following steps:

(S1) Install the fixed bracket 10 and the six-dimensional automatic adjustment frame side by side on the calibration platform, install the PLC chip on the fixed bracket, and install the FA on the six-dimensional automatic adjustment frame, so that the 8-degree communication between the PLC chip and the FA The glossy surface is in a positive relative position.

Specifically, as shown in Figure 9, the six-dimensional automatic adjustment frame includes a base 11 installed on the calibration platform, an X-axis adjustment mechanism 12 installed on the base, and a Y-axis adjustment mechanism installed on the X-axis adjustment mechanism 13. The Z-axis adjustment mechanism 14 installed on the Y-axis adjustment mechanism, the horizontal rotation adjustment mechanism 15 installed on the Z-axis adjustment mechanism, the vertical rotation adjustment mechanism 16 installed on the horizontal rotation adjustment mechanism, The low-resistance slide rail 17 installed on the vertical rotation adjustment mechanism, the FA installation platform 18 connected with the low-resistance slide rail, and the displacement sensor 19 installed on the FA installation platform. Among them, the X, Y, and Z axial adjustment mechanisms can be manually adjusted or electrically adjusted, and the horizontal and vertical direction rotation adjustment mechanisms are all driven by a stepper motor 20. The controller is connected with the stepper motor. The mechanism used in this embodiment is that the X, Y, and Z axial adjustment mechanisms adopt manual adjustment, and the horizontal and vertical direction rotation adjustment mechanisms all adopt stepping motor drive adjustment; the resolution of the rotation angle of the stepping motor, that is, the rotation accuracy is a full step 0.00153°/half step 0.000765°; the low-resistance slide rail adopts the SYT linear slide rail of NB Company, which has ultra-low resistance, and its starting resistance is consistent with the motion resistance; considering the cost and accuracy of the displacement sensor, the selection accuracy is 0.4 um common commercial displacement detector, the accuracy of which is 9mm for the FA width l , the angle corresponding to the rotation offset of 0.4um can be calculated as θ = tan ^-1 (0.4/9000) = 0.0025°, which satisfies the minimum resolution of 0.03° requirements.

(S2) Preliminarily adjust the position of the FA to be roughly equal to the PLC chip, and in a basic contact state. The so-called substantially flat refers to the situation that the position between the FA and the PLC chip directly observed by the naked eye has no obvious misalignment, and the end faces of the two have no obvious deviation. The basic contact state is a state in which the two 8-degree light-transmitting surfaces of the PLC chip and the FA are close to each other but not in contact, and the two 8-degree light-transmitting surfaces can collide with each other through a rotation. In terms of apparent operation, when the PLC chip and FA are roughly equal, the position of the control FA is gradually approaching the position of the PLC chip, and the two seem to be in contact with the naked eye, but the FA is not touched to make the displacement sensor have a reading.

After the above preliminary adjustment is completed, fine adjustment can be performed. In this embodiment, the preliminary adjustment adopts manual adjustment, and the fine adjustment adopts electric adjustment. And essentially, the following adjustment order in the horizontal and vertical directions has no obvious influence on the result, that is, the order of steps (S3) and (S4) can be exchanged with steps (S5) and (S6).

(S3) Control the FA to rotate at an angle of ±α in the vertical direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to displace, and obtain the displacement value d11 corresponding to the forward rotation angle α and the displacement corresponding to the reverse angle -α valued12;

(S4) Judging whether the FA and the end face of the PLC chip are aligned in the vertical direction by the difference between the two displacement values d11 and d12, if not, adjust the corresponding rotation direction according to the positive or negative value of the difference and adjust the corresponding rotation angle according to the value of the difference to Align the FA and PLC chip end faces vertically.

In the vertical direction, the value of α in this embodiment is 2°. After the stepper motor controls the FA to rotate forward by 2°, the low-resistance slide rail moves backward due to the collision between the FA and the end face of the PLC chip, and the displacement data is recorded by the touch displacement sensor. d11, then reversely turn to FA to return to the initial position, and then continue to rotate 2°, that is, rotate -2° from the initial position, it is the reverse rotation that makes FA hit the PLC chip again, and then causes the low-resistance slide rail to move backward, and the touch displacement The sensor records displacement data d12. If the two 8-degree light-transmitting surfaces are not parallel, then d11 ≠ d12 must be. Although the motion trajectory of 2° rotation is a circular arc, but because the rotation angle is very small, much smaller than the circular angle, as shown in Figure 10, then the motion trajectory arc s is a small amount relative to the section width l , so the circular arc etc. The effect is linear displacement. Assuming d11>d12, then there is a functional relationship between (d11 – d12) / 2 and the deviation angle θ between the two 8-degree light-transmitting surfaces, which can be expressed as θ = f [(d11-d12)/2], expressed here in The vertical component, then adjust the FA position accordingly to align the two 8-degree light-transmitting surfaces in the vertical direction.

In practice, in order to facilitate adjustment and save calculation difficulty, the function θ = f [(d11-d12)/2] can be pre-determined, and the angle-displacement curve corresponding to the corresponding relationship can be formulated, so that only the above-mentioned After obtaining the displacement difference, the angle that the FA should adjust can be obtained through the angle-displacement curve, so as to facilitate automatic control. The steps to formulate the angle-displacement curve are as follows:

(a) Set the two 8-degree light-transmitting surfaces of the PLC chip and the FA to be completely parallel and in contact with each other;

(b) Adjust the deflection of the FA through a stepping motor, and record the displacement value Δd when the FA is deflected by a specific subdivision degree ω (for example, ω=0.002° is selected in this embodiment), where ω is greater than the deflection accuracy of the FA , that is, the rotation accuracy of the stepping motor; in order to better realize the driving of the stepping motor, in this step, the deflection voltage ΔV of driving the stepping motor when the FA deflects a specific subdivision degree ω is also recorded at the same time;

(c) Formulate the angle-displacement curve according to the recorded data, and the angle-displacement-deflection voltage curve can be formulated in the case of ΔV, and the deflection voltage value of the driving stepper motor can be directly obtained according to the displacement difference , so as to achieve the purpose of simple calculation and precise adjustment.

After adjusting in the vertical direction, adjust in the horizontal direction in the same way, that is, the following steps (S5) and (S6):

(S5) Control the FA to rotate ±β angles in the horizontal direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to be displaced, and obtain the displacement value d21 corresponding to the forward rotation angle β and the displacement corresponding to the reverse rotation angle -β valued22;

(S6) Judging whether the FA and the end faces of the PLC chip are aligned in the horizontal direction by the difference between the two displacement values d21 and d22, if not, adjust the corresponding rotation direction according to the positive and negative values of the difference and adjust the corresponding rotation angle according to the value of the difference, to Align the FA and PLC chip end faces in the lateral direction.

(S7) Finally, through the above-mentioned alignment adjustments in the horizontal and vertical directions, the two ends of the FA and the PLC chip, that is, the two 8-degree light-transmitting surfaces, are parallel.

The above-described embodiments are only preferred embodiments of the present invention, and are not limitations on the scope of protection of the present invention. However, all changes made by adopting the design principle of the present invention and performing non-creative work on this basis should belong to the protection scope of the present invention. within.

Claims (9)

1. A method for adjusting the parallel coupling alignment plane of an optical splitter, characterized in that, comprising the steps: (S1) Install the fixed bracket and the six-dimensional automatic adjustment frame side by side on the calibration platform, install the PLC chip of the optical splitter on the fixed bracket, and install the optical fiber array FA on the six-dimensional automatic adjustment frame, so that The 8-degree light-transmitting surface of the PLC chip and the FA is in a positive relative position; (S2) Preliminarily adjust the position of FA to be roughly equal to the PLC chip, and in a basic contact state; (S3) Control the FA to rotate at an angle of ±α in the vertical direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to displace, and obtain the displacement value d11 corresponding to the forward rotation angle α and the displacement corresponding to the reverse angle -α valued12; (S4) Judging whether the FA and the end face of the PLC chip are aligned in the vertical direction by the difference between the two displacement values d11 and d12, if not, adjust the corresponding rotation direction according to the positive or negative value of the difference and adjust the corresponding rotation angle according to the value of the difference to Align the FA and PLC chip end faces in the vertical direction; (S5) Control the FA to rotate ±β angles in the horizontal direction, so that the two ends of the FA and the PLC chip collide, and cause the FA to be displaced, and obtain the displacement value d21 corresponding to the forward rotation angle β and the displacement corresponding to the reverse rotation angle -β valued22; (S6) Judging whether the FA and the end faces of the PLC chip are aligned in the horizontal direction by the difference between the two displacement values d21 and d22, if not, adjust the corresponding rotation direction according to the positive and negative values of the difference and adjust the corresponding rotation angle according to the value of the difference, to Align the FA and PLC chip end faces in the horizontal direction; (S7) Make the two ends of the FA and the PLC chip, that is, the two 8-degree light-transmitting surfaces, parallel to each other by adjusting the alignment in the horizontal and vertical directions; Wherein, the rotation angles α and β of the adjustment FA are not greater than 3.6°. 2. The method for adjusting the parallel coupling and alignment plane of an optical splitter according to claim 1, wherein the six-dimensional automatic adjustment frame in the step (S1) includes a base installed on a calibration platform, The X-axis adjustment mechanism installed on the base, the Y-axis adjustment mechanism installed on the X-axis adjustment mechanism, the Z-axis adjustment mechanism installed on the Y-axis adjustment mechanism, and the Z-axis adjustment mechanism installed on the Z-axis adjustment mechanism The horizontal rotation adjustment mechanism, the vertical rotation adjustment mechanism installed on the horizontal rotation adjustment mechanism, the low-resistance slide rail installed on the vertical rotation adjustment mechanism, the FA installation platform connected with the low-resistance slide rail, and the FA installation platform installed on the FA Displacement sensor on the mounting table. 3. The method for adjusting the parallel coupling and alignment plane of an optical splitter according to claim 1, characterized in that the basic contact state between the PLC chip and the FA in the step (S2) is the two sides of the PLC chip and the FA. The 8-degree light-transmitting surfaces are close to each other but not in contact, and the two 8-degree light-transmitting surfaces can collide with each other through one rotation. 4. A method for adjusting the coupling and alignment plane of an optical splitter to be parallel according to any one of claims 1 to 3, characterized in that, in the steps (S4) and (S6), the adjustment is made according to the difference value The corresponding angle of rotation is based on a pre-established angle-displacement curve. 5. the parallel adjustment method of a kind of optical splitter coupling alignment plane according to claim 4, it is characterized in that, described angle-displacement curve formulates according to the following steps: (a) Set the two 8-degree light-transmitting surfaces of the PLC chip and the FA to be completely parallel and in contact with each other; (b) Adjust the FA to make it deflect, and record the displacement value Δd when the FA is deflected by a specific subdivision degree ω; (c) Make an angle-displacement curve based on the recorded data. 6 . The method for adjusting the parallelism of the coupling alignment plane of the optical splitter according to claim 5 , wherein the specific subdivision degree ω is greater than the deflection accuracy of the FA. 7 . 7 . The method for adjusting the coupling and alignment planes of the optical splitter to be parallel according to claim 5 , wherein the six-dimensional automatic adjustment frame is driven and deflected by a stepping motor. 8 . 8. A method for adjusting the parallel alignment of the optical splitter coupling alignment plane according to claim 7, characterized in that, in the step (b), the simultaneous measurement and recording FA is driven every time it is deflected by a specific subdivision degree ω The deflection voltage ΔV of the stepper motor. 9. A method for adjusting the parallel alignment of coupling and alignment planes of optical splitters according to claim 8, characterized in that, in the step (c), an angle-displacement-deflection voltage curve is formulated, and in step (S4) The displacement value calculated from the difference value in (S6) obtains the corresponding deflection voltage through the curve, and controls the stepper motor to adjust FA.