TWI472731B - Coupling efficiency detection device of optical fiber coupler and method thereof - Google Patents

Description

Coupling efficiency detecting device of fiber coupler and method thereof

The invention relates to a coupling efficiency detecting device and a method thereof for a fiber coupler, in particular to a coupling efficiency detecting device and a method for finding a position of an optimum coupling efficiency by utilizing a relationship between a fiber coupling efficiency trend and an offset relationship.

In recent years, optical fiber has been widely used in communication systems. Its function is to transmit optical signals from one end to the other. Compared with traditional cables, optical fibers have light weight, low transmission loss, low electromagnetic interference, and high security. Sex and other advantages. In the architecture of optical transmission, optical fibers, microlenses and couplers become indispensable components of optical connectors. However, in addition to the optical fiber process quality, fiber-optic coupling is also an important task of signal transmission. Under the trend of lightness and shortness, these components are getting smaller and smaller, so the fiber coupling process is becoming more and more difficult. Since light is transmitted by total reflection in the light guiding core of the optical fiber, the coupling between the optical fiber and the optical fiber must be more precise, so that the loss rate of the optical transmission after coupling is minimized, so that the transmission can be performed efficiently.

In the process of fiber coupling, the two-stage fiber cannot be accurately aligned due to factors such as sloshing, air disturbance or human collision, and the optical transmission loss rate after coupling cannot meet the fiber coupling standard. There are two common types of unprecision alignment: the two-stage fiber and the lens core are off-axis and the fiber and the lens core are tilted.

In 2009, Intel released a technology called Light Peak, which consolidates a fiber-optic cable into the most popular USB (Universal Serial Bus) cable. In other words, the future USB cable can be used not only as a transmission of electrical signals, but also as a high-speed transmission of optical signals. In order to make the optical fibers connect to each other in the traditional USB connector, Intel has developed a new type of connection method called Converged input/output interface module, which is a combined input/output interface module. The basic principle is to use the Free Space Optical Interconnects (FSOIs) to connect the two fiber ends (one for transmission and one for reception). The lens L1 and the lens L2 are used to connect the two fibers, and the fiber A is injected together. The diffused light with a numerical aperture (NA) of θ is refracted by the lens L1 into parallel light, which is then received by the lens L2 to focus the parallel light onto the optical fiber B. The pooled I/O interface module includes three connectors, two of which are Plug Lens and Receptacle Lens.

The plug lens and the front end of the socket lens each have four plano-convex lenses, which function to collimate the diffused light and the focused parallel light emitted by the fiber ends. Since the displacement between the plug lens and the axis of the lens and the optical fiber in the socket lens will seriously affect the coupling yield, it is important to confirm whether the lens and the axis of the optical fiber in the socket lens are offset from each other. Question.

In addition, the future socket lens will be integrated into the transmission hole of the motherboard, and the plug lens will be integrated into various 3C product transmission joints. If the user improperly uses or stores the 3C product, it may cause the plug lens to the socket lens. The core is offset or damaged. Therefore, if the 3C product is connected to the computer, if the coupling efficiency can be detected and the communication quality of the 3C product is analyzed, the service life of the fiber transmission connector can be extended.

In the past, the fiber alignment technology is divided into the following two types: 1. Passive alignment, the main method is to use the germanium substrate as the optical communication component carrier, and adopt the etching technology in the microelectromechanical process to preliminarily the position with the best coupling rate in theory. Positioning structures, such as V-grooves, locating tips, etc., are placed and the components are placed for alignment purposes. The optimum coupling ratio of passive alignment technology is generally about 50%; 2. Active alignment, the main method is to fine-tune the position of each component in the module when the light-emitting element emits light, adjust the light path, and measure the coupling ratio to reduce the loss of optical power to a minimum. Since the active alignment uses the coupled coupling ratio as the feedback control during alignment, a higher coupling ratio can be achieved. The optimum coupling ratio of active alignment technology is generally about 70%~90%.

However, the above method cannot quickly find the offset and directivity, and find the optimal coupling efficiency position.

Therefore, how to design a coupling efficiency detecting device and method for the fiber coupler that can quickly obtain the offset and directivity and find the optimal coupling efficiency position has become a joint effort of relevant manufacturers and related R&D personnel. aims.

The present inventors have actively pursued development in view of the shortcomings of the conventional fiber alignment technology that cannot quickly obtain the offset and directivity, and find the optimal coupling efficiency position, in order to improve the above-mentioned shortcomings. The experiment and efforts have finally developed the present invention.

A first object of the present invention is to provide a coupling efficiency detecting device for a fiber coupler that can quickly obtain an offset and directivity and find an optimum coupling efficiency position.

In order to achieve the above object, the coupling efficiency detecting device of the fiber coupler of the present invention is configured to perform active fiber coupling alignment detection, and the coupling efficiency detecting device of the fiber coupler comprises: a light source for emitting a Laser light; at least one translation stage; a plug lens (Plug Lens), is disposed on the translation stage; a receptacle lens (Receptacle Lens) disposed on the translation stage adjacent to the plug lens; a first optical fiber having a first optical fiber connector at one end thereof, the first optical fiber connector being adjacent to the light source The other end of the first optical fiber is connected to the plug lens; a second optical fiber has one end connected to the socket lens, the other end of the second optical fiber includes a second optical fiber connector; and a detecting system. The system is disposed beside the second fiber optic connector and includes a database.

The laser light emitted by the light source is transmitted to the plug lens through the first optical fiber, and the laser light is diffused and emitted in parallel through the plug lens, and the socket lens further couples the laser light into the second optical fiber. The second optical fiber projects an image to the detection system, and the detection system separates the coupled light spot and the background in the image by using an image processing method, and calculates an average gray scale value of the coupled light spot, and averages the coupled light spot. The order value is defined as the brightness value, and the image brightness value of the optimal coupling efficiency is set as the reference reference value, and the coupling efficiency of various offset degrees is calculated from the reference value, and then compared to the radial three-dimensional spatial brightness distribution database. The data finds the offset of the off-axis plane, and the offset directionality is obtained by directing the change of the coupling efficiency after the axial offset, and after returning the offset in the opposite direction, if the optimal coupling efficiency is not achieved, Then, when looking for the axial maximum efficiency position, stop, and then shift the directionality judgment and the offset calculation to the other axial direction, and repeat the X axial direction, the Y axial direction, the Z axial direction, and the inclination axial direction to Analyzing the origin position is calculated from the set, to calculate the inclination of the entire three-axis offset, the return to optimum coupling efficiency position.

A second object of the present invention is to provide a coupling efficiency detecting method for a fiber coupler that can quickly obtain an offset and directivity and find an optimum coupling efficiency position.

In order to achieve the above object, the coupling efficiency detecting method of the fiber coupler of the present invention is applied to a coupling efficiency detecting device of a fiber coupler, and the coupling efficiency detecting device of the fiber coupler includes at least a plug lens (Plug Lens), a socket lens (Receptacle Lens), a first fiber and a second fiber, the coupling efficiency detecting method of the fiber coupler includes the steps of: emitting a laser light; transmitting the laser light to the plug through the first fiber a lens; the laser light is diffused and projected in parallel by the plug lens; the laser light is used to focusly couple the laser light into the second optical fiber; an image is projected through the second optical fiber; and the image is separated by image processing The coupling spot and the background in the image; using the coupling spot in the image, calculating the average gray level value of a coupled spot, and defining the average gray level value of the coupled spot as the brightness value; setting the image of the optimal coupling efficiency The brightness value is the reference reference value, and the coupling efficiency of various offset degrees is calculated from the reference value; the off-axis flat is obtained by comparing the data in the database. The offset of the surface, and the change of the coupling efficiency after directing an axial offset, the offset directivity is obtained; after returning the offset in the reverse direction, if the optimal coupling efficiency is not reached, the axial maximum is found. When the efficiency position is stopped, the offset directivity judgment and the offset calculation are performed in the other axial direction; and the distance between the origin position is calculated and set to calculate the inclination and return to the optimal coupling efficiency position.

Through the above-mentioned device and method, it is ensured that the fiber coupler achieves the best coupling efficiency when performing the para-coupling, and achieves the goal of reducing the fiber coupling loss and accelerating the alignment time.

The preferred embodiments of the present invention are described in detail below with reference to the drawings.

Referring to the first figure, the coupling efficiency detecting device (1) of the fiber coupler of the present invention is used for active fiber coupling alignment detection, and the coupling efficiency detecting device (1) of the fiber coupler includes a a light source (10), at least one translation stage (11), a plug lens (12), a socket lens (13), a first optical fiber (14), a second optical fiber (15), and a detection system (16), The light source (10) is configured to emit a laser light; the plug lens (12) is disposed on the translation stage (11); the socket lens (13) is disposed on the translation stage (11) adjacent to the a position of the plug lens (12); one end of the first optical fiber (14) includes a first optical fiber connector (140), the first optical fiber connector (140) is adjacent to the light source (10), the first The other end of the optical fiber (14) is connected to the plug lens (12); one end of the second optical fiber (15) is connected to the socket lens (13), and the other end of the second optical fiber (15) includes a first A fiber optic connector (150); the detection system (16) is disposed adjacent to the second fiber optic connector (150) and includes a database (not shown).

The laser light emitted by the light source (10) is transmitted to the plug lens (12) through the first optical fiber (14), and the laser light is diffused and emitted in parallel through the plug lens (12), and the socket lens (13) is further Focusing the laser light into the second optical fiber (15), the second optical fiber (15) projecting an image to the detection system (16), and the detection system (16) uses the image to find an optimal coupling Efficiency location.

In a preferred embodiment of the present invention, the detection system (16) utilizes image processing to separate the coupled spot and background in the image, and calculates a coupled gray point average gray level value, and the coupling The average gray level value of the combined light point is defined as the brightness value, and the image brightness value of the optimum coupling efficiency is set as the reference reference value, and the coupling efficiency of various offset degrees is calculated by using the reference value, and the data in the database is compared. Offset from the off-axis plane, and after changing the coupling efficiency after directing an axial offset, the offset directivity is obtained, and after the offset is returned in the opposite direction, if the optimal coupling efficiency is not achieved, then When the axial maximum efficiency position is sought, the offset direction judgment and the offset calculation are performed in the other axial direction, and the origin position distance is calculated and calculated to calculate the inclination and return to the optimal coupling efficiency position.

Referring to the first and second figures, in a preferred embodiment of the present invention, the detection system (16) further includes: a screen (160) with one side opposite to the second fiber connector ( 150), the second optical fiber (15) projects an image onto the screen (160); an image capturing device (161) is disposed on the opposite side of the screen (160), using image processing Separating the coupled spot and background in the image; and a processing device (162) coupled to the image capturing device (161) for calculating a coupled spot average grayscale value and coupling the coupling The average gray scale value of the light spot is defined as the brightness value, and the image brightness value of the optimum coupling efficiency is set as the reference reference value, and the coupling efficiency of various offset degrees is calculated from the reference value, and the data in the comparison database is obtained. The offset of the axial plane, and the change of the coupling efficiency after guiding an axial offset, the offset directivity is obtained, and after the offset is returned in the opposite direction, if the optimal coupling efficiency is not reached, the axial direction is sought. Stop at the maximum efficiency position, and make the directionality judgment in the other axial direction Offset calculation, calculate and set the origin position distance, calculate the slope and return to the optimal coupling efficiency position.

One end of the plug lens (12) not connected to the first optical fiber (14) has a four plano-convex lens, and the one end of the socket lens (13) not connected to the second optical fiber (15) has a four plano-convex lens, and the light source (10) ) The emitted laser light is a laser light of monochromatic light.

In another preferred embodiment of the present invention, the coupling efficiency detecting device (1) of the fiber coupler further includes an optical anti-vibration table (not shown) for fixing the translation stage (11) The plug lens (12) is aligned with the socket lens (13), and the plug lens (12) is not in contact with the socket lens (13).

The translation stage (11) is a five-axis precision translation stage, which can adjust the X axis, the Y axis, the Z axis and the inclination axis. The database records the X axis and the Y axis of the translation stage. The coupling efficiency of the Z-axis and the inclination axial direction is adjusted positively and negatively with a minimum offset. When the coupling efficiency is increased by the normal rotation in the X-axis, the Y-axis, the Z-axis, and the inclination axis, the negative axial shift is determined, and when the coupling efficiency is decreased, the positive axial shift is determined.

Referring to Figures 2 to 17, in order to make it easier for the reviewing committee to understand the coupling efficiency detecting device (1) of the fiber coupler of the present invention, an embodiment is described as follows: First, the five-axis precision platform is adjusted. The height and parallelism of (11) make the plug lens (12) and the axis of the socket lens (13) on the same axis, which is the best case of coupling efficiency. In this case, the coupled spot map captured by the image capturing device (161), the coupled light will affect the fiber coupling after the off-axis (third image) or tilt (fourth image) of the core. The attenuation of the light energy, so that the brightness value can be calculated by the image processing through the processing device (162), and the brightness value is used as the energy value of the coupling spot (fifth figure), when the degree of off-axis is greater The smaller the energy value of the spot (the sixth picture), then the grayscale division of the image, separating the complex coupling spot (30) and a background (31), and calculating the coupling spots (30) The sum of the gray scale values sums up with the pixel points, and the average gray scale value G _avg can be obtained, and the average gray scale value is defined as the luminance value.

The coupling efficiency calculation method is as follows: an active fiber coupling detection method is adopted, and laser light is input to the first optical fiber (14) and the second optical fiber (15) for fiber coupling, and is projected onto the screen (160) to observe the same. The coupling spot (30) changes, the processing device (162) performs image processing, and the luminance value of the coupled spot (30) image is calculated, so that the actual input and output optical power values cannot be known, so the relative coupling efficiency is adopted. Calculate the method to find the normalized coupling efficiency. When the plug lens (12) and the axis of the socket lens (13) are on the same axis, at this time, the coupling effect is optimal, the brightness value is recorded as the reference brightness value I _b , and the translation is adjusted. The X, Y axis or tilt angle of the table (11) is adjusted by a fixed value, and the image capturing device (161) is used to capture an image and record its luminance value I _i , and its coupling efficiency CE _i is calculated by the following formula.

The method for establishing the database of the detection system (16) is as follows: adjusting the X-axis or the Y-axis of the translation stage (11) so that the axis of the plug lens (12) is recorded with a minimum offset per offset. Coupling efficiency. After calculating the coupling efficiency, the processing device (162) establishes a database, and in the future, the offset corresponding to the coupling efficiency of each axis can be compared through the database, and the offset directivity is determined by the coupling efficiency attenuation trend.

The method for calculating the axial offset of the plug lens (12) is as follows: the reference brightness value is known, and the processing device (162) calculates the brightness value of the image captured by the image capturing device (161) via image processing. Assuming that the axis of the plug lens (12) is off-axis d _k , the processing device (162) determines the coupling efficiency CE _k via the images. Then, the database coupling efficiency CE is compared, and the corresponding offset is d. If CE _k = CE, the axis of the plug lens (12) is off-axis d _k = d; if CE when _k ≠ CE, the search range of the coupling efficiency CE _i, CE _i-1 and offset corresponding to the range of d _i, d _i-1, d _k can be determined by using the offset interpolation, wherein

It can be inferred by the above method that when the processing device (162) calculates the coupling efficiency CE _k , the axis offset d _k of the X-axis off-axis, the Y-axis off-axis or the tilt is:

Among them, CE _X is the coupling efficiency of the X-axis off-axis of the database, d _X is the offset corresponding to CE _X , CE _Y is the coupling efficiency of the Y-axis off-axis of the database, and d _Y is CE _Y The corresponding offset.

The method for judging the offset directivity is as follows: firstly define the positive and negative rotation of the axial direction (eighth figure), calculate the current coupling efficiency CE _k , and specify the axial forward rotation of the translation stage (11), and rotate to a small section. After the distance, the coupling efficiency CE _k+1 and the offset d _{k+1 are} calculated. If CE _k -CE _k+1 >0, it can be determined that the current position is a positive offset. Conversely, if CE _k -CE _k+1 <0, it can be determined that the current position is a negative offset (ninth diagram), wherein the positive and negative rotations of the axial direction are powered by a motor (7).

If the current coupling efficiency CE _{k is} at the negative axial position, the axial forward rotation is a small distance and then falls in the positive axial coupling efficiency CE _k+1 position. In the first case, the coupling efficiency becomes larger CE _k -C _{When Ek} +1<0, the detection system (16) misjudges the coupling efficiency CE _k+1 position in the negative axial direction after the axial forward rotation, and the movement deviation is guided according to the detection system (16). After the shift, the optimal coupling efficiency position is not reached, but is reduced to the coupling efficiency CE _k+2 position, and the detection system (16) will determine that CE _k+1 -CE _k+2 >0 is positive. The axial direction, in turn, calculates the offset and returns the axis to the optimum coupling efficiency position (Fig. 10).

When the second case is that the coupling efficiency becomes smaller CE _k -CE _k+1 >0, although the negative axis is converted to the positive axis, the detection system (16) is still judged to be a positive axis, and is calculated. The offset is such that the axis is returned to the optimal coupling efficiency position (Fig. 11).

The method for finding the optimal coupling efficiency is as follows: simulating the axis alignment of the plug lens (12) and the socket lens (13), respectively shifting the single X-axis and the Y-axis of the plug lens (12) to simulate coupling efficiency Loss trend graph, with the horizontal axis representing X off-axis and the vertical axis representing Y off-axis, plotting the radial three-dimensional spatial brightness distribution and coupling efficiency contour map (12th), when the core offset increases , the coupling efficiency is reduced, and the characteristic is obtained in the two-dimensional coupling efficiency contour map to find the optimum coupling efficiency position. If the axis position of the plug lens (12) is (x _n , y _n ), the first direction is specified to the X axis. Positively offset by a small distance d _mx , if the coupling efficiency becomes larger, it can be known that (x _n , y _n ) is in the left half plane; if the coupling efficiency becomes smaller, it can be known that (x _n , y _n ) is in the right half plane. . Comparing the X-axis database to calculate the offset d _kx and returning to d _kx in the opposite direction, if it is not equal to the optimal coupling efficiency, judge the Y-axis offset and then offset in the opposite direction until the coupling efficiency is on the same horizontal axis. When the coupling efficiency is maximum, stop, and then shift to the Y axis for a short distance d _my . If the coupling efficiency becomes larger, it can be known that (x _n , y _n ) is in the lower half plane; if the coupling efficiency becomes smaller, it can be obtained. Knowing (x _n , y _n ) in the upper half plane, the offset d _{ky is} calculated by comparing the Y-axis database, and d _ky is returned in the opposite direction, which is the optimal coupling efficiency position. (x _n , y _n ) in different quadrants, the route to find the best coupling efficiency will be different, but the judgment methods are the same, there are four cases: Condition 1, (x _n , y _n ) in the first quadrant (tenth Three maps); condition two, (x _n , y _n ) in the second quadrant (fourteenth map); condition three, (x _n , y _n ) in the third quadrant (fifteenth map); and condition four, (x _n , y _n ) is in the fourth quadrant (16th).

If the axis of the plug lens (12) is first tilted by θ°, then a single X-axis and Y-axis offset is performed to simulate a coupling efficiency loss trend graph, and the horizontal axis represents X off-axis and the vertical axis represents Y off-axis. Draw a contour map of the coupling efficiency. Compared with the contour map of the coupling efficiency without tilting, it can be found that the optimum coupling efficiency position is not at the origin. This characteristic determines whether the axis of the plug lens (12) is tilted or not. Case: Condition 1, the axis of the plug lens (12) is first tilted by θ°, and then shifted by a single X-axis and Y-axis (Fig. 17); and Condition 2, the axis of the plug lens (12) is first After tilting θ°, the single X-axis is offset from the Y-axis (Fig. 18).

After knowing the optimal coupling efficiency position, the origin distance dt, and the length df of the translation stages (11), the slope θ degrees can be calculated by the following formula (19th):

After the two-dimensional XY off-axis correction, the coupling efficiency position (x _o , y _o ) is reached. If (x _o , y _o ) is located on the +Y off-axis of the coupling efficiency contour map, the plug lens can be judged (12). The axis of the axis is negatively inclined by θ°; if it is located off-axis of the coupling efficiency contour map, it can be judged that the axis of the plug lens (12) is inclined by θ° and returned to θ° in the opposite direction. Optimal coupling efficiency and location.

If the axis of the plug lens (12) is tilted left by θ °, a single X-axis and Y-axis offset is performed, and a coupling efficiency loss trend graph is simulated, and the horizontal axis represents X off-axis, and the vertical axis represents Y-off. For the axis, draw a contour map of the coupling efficiency (p. 20). Compared with the contour map of the coupling efficiency without tilt, it can be found that the optimum coupling efficiency position is not at the origin, but is shifted to the right by dtx, and the characteristic of the plug lens (12) is discriminated.

After knowing the optimum coupling efficiency position and the origin distance dtx, and the length of the translation stage (11) df, the inclination θ degree can be calculated by the formula (3.2) (the twenty-first figure).

After being corrected by the two-dimensional XY off-axis, the coupling efficiency position (x _o , y _o ) is reached. If (x _o , y _o ) is located on the +X off-axis of the coupling efficiency contour map, the plug lens can be judged (12). The axis of the axis is tilted to the left by θ °; otherwise, if it is located off the -X off-axis of the coupling efficiency contour map, it can be judged that the axis of the plug lens (12) is inclined to the right by θ ° and returned to θ ° in the opposite direction. Optimal coupling efficiency and location.

Referring to FIG. 22, the coupling efficiency detecting method (2) of the fiber coupler of the present invention is applied to a coupling efficiency detecting device (1) of a fiber coupler, and the coupling efficiency detecting device of the fiber coupler (1) comprising at least a plug lens (12), a socket lens (13), a first optical fiber (14) and a second optical fiber (15), and the coupling efficiency detecting method (2) of the optical fiber coupler comprises the steps Step 200: transmitting a laser light; step 201: transmitting the laser light to the plug lens (12) through the first optical fiber (14); Step 202: diffusing the laser light by the plug lens (12) Parallel injection; step 203: using the socket lens (13) to focusly couple the laser light into the second optical fiber (15); step 204: projecting an image through the second optical fiber (15); step 205: using the image a method of separating a coupling spot and a background in the image; Step 206: Calculate an average gray scale value of a coupled spot by using the coupling spot in the image, and define the average gray scale value of the coupled spot as a brightness value; Step 207: Set an image brightness value of the optimal coupling efficiency. For reference to the reference value, and calculate the coupling efficiency of various offset degrees by using the reference value; Step 208: Find the offset of the off-axis plane from the data in the database, and guide the axial offset The coupling efficiency changes, and the offset directivity is known. Step 209: After returning the offset in the reverse direction, if the optimal coupling efficiency is not reached, the axial maximum efficiency position is stopped, and then the other axial direction is biased. The directionality determination and the offset calculation are performed; and step 210: calculating and setting the origin position distance to calculate the inclination and returning to the optimal coupling efficiency position.

Referring to the twenty-third figure, the off-axis search axis operation method (4) of the present invention comprises the following steps: Step 400: Calculate a coupling efficiency; Step 401: Determine whether the coupling efficiency is less than 100%; Step 402: The coupling efficiency is not less than 100%, and the coupling efficiency is determined to be the optimal coupling efficiency; step 403: if the coupling efficiency is less than 100%, the axial forward rotation is performed, and a coupling efficiency is calculated; step 404: determining the coupling efficiency Whether it becomes larger; Step 405: If the coupling efficiency does not become large, calculate the offset, and turn the axis negatively, and then proceed to step 400; Step 406: If the coupling efficiency becomes larger, calculate the offset And will rotate axially forward; Step 407: Recalculate a coupling efficiency; and Step 408: Determine whether the coupling efficiency becomes smaller. If the coupling efficiency becomes smaller, proceed to step 405. If the coupling efficiency does not decrease, proceed to step 400; Figure 24, the tilt search axis operation method (5) of the present invention, comprising the steps of: Step 500: determining that the center of the axis is located on the Y axis or the X axis; Step 501: If the center of the axis is on the Y axis, Determining whether the axis is a positive axis; Step 502: If the axis is not a positive axis, calculate a tilt angle, and use the tilt angle to adjust the angle downward to obtain an optimal coupling efficiency; Step 503: The axis is a positive axis, the tilt angle is calculated, and the angle is adjusted upward by the tilt angle to obtain an optimal coupling efficiency. Step 504: If the center of the axis is located on the X axis, determine whether the axis is a positive axis Step 505: If the axis is a positive axis, calculate a tilt angle, and use the tilt angle to adjust the angle to the right to obtain an optimal coupling efficiency; and step 506: if the axis is not a positive axis, calculate Tilt angle And use the tilt angle to adjust the angle to the left for the best coupling efficiency.

Referring to the first, second and twenty-fifth views, the method (6) of the coupling efficiency detecting device (1) of the optical fiber coupler of the present invention comprises the following steps: Step 600: Turning on the image capturing device ( 161); Step 601: Determine whether the image capturing device (161) reaches the reference brightness value; Step 602: Enter the X-axis regression process; Step 603: Determine whether the optimal coupling efficiency is achieved; Step 604: If the optimal coupling efficiency is not reached, enter the Y-axis regression process; Step 605: Determine whether the center is the origin; Step 606: If the center is not the origin, enter the tilt regression process; and Step 607: If the center is At the origin, the coupling efficiency detecting device (1) of the fiber coupler is stopped.

Through the above device and method, the present invention not only ensures optimal coupling efficiency of the fiber coupler in performing para-coupling by means of database establishment mechanism and detection of fiber coupling efficiency, axial offset and offset directivity. It also reduces fiber coupling loss and accelerates alignment time. Moreover, its structural form is not easily reached by those skilled in the art, and it is novel and progressive.

Through the above detailed description, it can fully demonstrate that the object and effect of the present invention are both progressive in implementation, highly industrially usable, and are new inventions not previously seen on the market, and fully comply with the invention patent requirements. , 提出 apply in accordance with the law. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention. All changes and modifications made in accordance with the scope of the invention shall fall within the scope covered by the patent of the invention. I would like to ask your review committee to give a clear explanation and pray for it.

(1) ‧‧‧Coupling efficiency detecting device for fiber coupler

(10) ‧‧‧Light source

(11)‧‧‧ translation table

(12)‧‧‧ Plug lens

(13)‧‧‧Socket lens

(14)‧‧‧First fiber

(140)‧‧‧First fiber optic connector

(15)‧‧‧second fiber

(150)‧‧‧Second fiber optic connector

(16)‧‧‧Detection system

(160)‧‧‧ screen

(161)‧‧‧Image capture device

(162) ‧‧‧Processing device

(2) ‧‧‧Coupling efficiency detection method for fiber coupler

200‧‧‧ steps

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(30) ‧‧‧coupled spots

(31) ‧ ‧ background

(4) ‧‧‧ Off-axis search axis operation method

400‧‧‧ steps

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(5) ‧‧‧ Tilt search axis operation method

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(6) Operation method of coupling efficiency detecting device of optical coupler

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(7)‧‧‧Motor

G _avg ‧‧‧average grayscale value

I _b ‧‧‧reference brightness value

CE _i ‧‧‧Coupling efficiency

d _k ‧‧‧The axis of the plug lens is off-axis

CE _k ‧‧‧Coupling efficiency

CE‧‧‧Database coupling efficiency

D‧‧‧ offset

Coupling efficiency of the X-axis off-axis of the CE _X ‧‧‧ database

d _X ‧‧‧CE _X corresponding offset

CE _Y ‧‧‧Coupling efficiency of Y-axis off-axis

d _Y ‧‧‧CE _Y corresponding offset

(x _n , y _n ) ‧‧‧Axis position of the plug lens

Dt‧‧‧ origin distance

Length of df‧‧‧ translation stage

The first figure is a schematic diagram of a coupling efficiency detecting architecture of the optical fiber coupler of the present invention and a structure thereof; the second drawing is a schematic structural view of the detecting system of the present invention; and the third drawing is the core of the plug lens and the socket lens of the present invention. Schematic diagram of the off-axis; the fourth diagram is a schematic diagram of the tilt of the plug lens of the present invention and the axis of the socket lens; The fifth figure is a schematic diagram of the energy value of the coupling spot of the present invention; the sixth to sixth E diagrams are diagrams showing the smaller the off-axis degree of the present invention, the smaller the energy value of the light spot; the seventh figure is the invention The schematic diagram of the separation coupling spot and the background; the eighth diagram is a schematic diagram of the positive and negative rotation of the axial direction defined by the present invention; the ninth diagram is a schematic diagram of the present invention for determining whether the current position is a positive or negative offset; The figure is a schematic diagram of the present invention which falls in different axial directions and has a large coupling efficiency; the eleventh figure is a schematic diagram of the invention which falls in different axial directions after the forward rotation and the coupling efficiency becomes smaller; The radial three-dimensional spatial brightness distribution and coupling efficiency contour map of the present invention; the thirteenth diagram is a schematic diagram of the axial position of the plug lens of the present invention in the first quadrant; and the fourteenth embodiment is the axial core of the plug lens of the present invention 15 is a schematic view showing a position of a core of the plug lens of the present invention in a third quadrant; and a sixteenth view showing a position of a core of the plug lens of the present invention in a fourth quadrant; The seventeenth figure is the present invention The axis of the plug lens is tilted by θ° first, and then shifted in a single X-axis and Y-axis; the eighteenth figure is the axis of the plug lens of the present invention is tilted by θ°, in a single X-axis and Y-axis Schematic diagram of the offset; the nineteenth is a schematic diagram of the optimum coupling efficiency position and the origin distance of the present invention, and the length of the translation stage; the twentieth figure is the contour line of the XY off-axis coupling efficiency after the left tilt of the present invention; 21 is a schematic diagram of calculating the left and right tilt angles of the present invention; The twenty-second diagram is a flowchart of a method for detecting a coupling efficiency of a fiber coupler of the present invention; and the twenty-third figure is a flowchart of a method for operating an off-axis search axis of the present invention; A flowchart of a method for operating a tilt-searching axis operation method of the invention; and a twenty-fifth diagram of a method for operating a coupling efficiency detecting device of the fiber coupler of the present invention.

(1) ‧‧‧Coupling efficiency detecting device for fiber coupler

(10) ‧‧‧Light source

(11)‧‧‧ translation table

(12)‧‧‧ Plug lens

(13)‧‧‧Socket lens

(14)‧‧‧First fiber

(140)‧‧‧First fiber optic connector

(15)‧‧‧second fiber

(150)‧‧‧Second fiber optic connector

(16)‧‧‧Detection system

Claims (7)

A coupling efficiency detecting device for a fiber coupler is used for performing active fiber coupling alignment detection. The coupling efficiency detecting device of the fiber coupler comprises: a light source for emitting a laser light; at least one translation stage a plug lens (Plug Lens) is disposed on the translation stage; a receptacle lens (Receptacle Lens) is disposed on the translation stage adjacent to the position of the plug lens; a first optical fiber, one end of which includes a first a fiber optic connector, the first fiber optic connector is adjacent to the light source, the other end of the first fiber is connected to the plug lens; and a second fiber is connected to the socket lens at one end, the second fiber The other end includes a second fiber optic connector; and a detection system disposed adjacent to the second fiber optic connector and including a database; the laser light emitted by the light source is transmitted to the a plug lens through which the laser light is diffused and emitted in parallel, the socket lens further couples the laser light into the second optical fiber, and the second optical fiber projects an image to the inspection The measurement system uses image processing method to separate the coupled light spot and the background in the image, and calculates an average gray scale value of the coupled light spot, and defines the average gray scale value of the coupled light spot as the brightness value. The image brightness value of the optimal coupling efficiency is set as a reference reference value, and the coupling efficiency of various offset degrees is calculated by using the reference value, and the off-axis plane is obtained by comparing the data in the radial three-dimensional spatial brightness distribution database. Offset, and by indicating the change in coupling efficiency after an axial offset, the offset directionality is known, and the opposite After returning to the offset, if the optimal coupling efficiency is not reached, it stops when looking for the axial maximum efficiency position, and then performs the offset directivity judgment and the offset calculation to the other axial direction, thus repeating the X-axis. The Y-axis, the Z-axis, and the tilt-axis axial direction are determined by comprehensive calculation to determine the distance from the origin position to calculate the overall tilt and the triaxial offset, and return to the optimal coupling efficiency position. The coupling efficiency detecting device of the optical fiber coupler according to claim 1, wherein the detecting system further comprises: a screen, one side of which is opposite to the second optical fiber connector, the second optical fiber projecting an image to On the screen, an image capturing device is disposed on the opposite side of the screen, and uses image processing to separate the coupling spot and the background in the image; and a processing device and the image capturing device The connection is used to calculate a mean gray scale value of a coupled spot, and the average gray scale value of the coupled spot is defined as a brightness value, and the image brightness value of the optimal coupling efficiency is set as a reference reference value, and the reference value is used. Calculate the coupling efficiency of various offset degrees, find the offset of the off-axis plane in the data in the comparison database, and change the coupling efficiency after guiding the axial offset to know the offset directivity. After the direction returns to the offset, if the optimal coupling efficiency is not reached, the axial maximum efficiency position is stopped, and the offset direction judgment and offset calculation are performed in the other axial direction. Calculation and setting The origin position distance is calculated and the inclination is calculated to return to the optimum coupling efficiency position. The coupling efficiency detecting device of the fiber coupler according to claim 1, wherein the plug lens has a quad flat lens which is not connected to the first fiber, and the socket lens is not connected to the second fiber. a quad flat convex lens, the laser light emitted by the light source is monochromatic light After the laser light. The coupling efficiency detecting device of the fiber coupler according to claim 1, further comprising an optical anti-vibration table for fixing the translation stage, the plug lens is aligned with the socket lens, and the plug lens system There is no contact with the socket lens. The coupling efficiency detecting device of the fiber coupler according to claim 1, wherein the translation stage is a five-axis precision translation stage, and the X-axis, the Y-axis, the Z-axis, and the inclination axis are adjustable. The database records the coupling efficiency of the X-axis, the Y-axis, the Z-axis, and the tilt axis of the translation stage with a minimum offset positive and negative adjustment. The coupling efficiency detecting device for a fiber coupler according to claim 5, wherein if the coupling efficiency becomes large by the X-axis, the Y-axis, the Z-axis, and the tilt-axis axial forward rotation, the determination is negative. The axial offset is determined to be a positive axial offset if the coupling efficiency is small. A coupling efficiency detecting method for a fiber coupler is applied to a coupling efficiency detecting device of a fiber coupler, and the coupling efficiency detecting device of the fiber coupler includes at least a plug lens (Plug Lens), a socket lens (Receptacle Lens), a first optical fiber and a second optical fiber, the coupling efficiency detecting method of the optical fiber coupler includes the steps of: emitting a laser light; transmitting the laser light to the plug lens through the first optical fiber; Dispersing the laser light in parallel; using the socket lens to focusly couple the laser light into the second optical fiber; projecting an image through the second optical fiber; and separating the coupled light spot and the background in the image by using image processing; Using the coupling spot in the image, calculating a mean grayscale value of the coupled spot, and defining the average grayscale value of the coupled spot as a brightness value; setting the image brightness value of the optimal coupling efficiency as a reference reference value, and The coupling efficiency of various offset degrees is calculated from the reference value; the offset of the off-axis plane is obtained by comparing the data in the database, and the offset direction is obtained by guiding the change of the coupling efficiency after the axial offset. After returning to the offset in the opposite direction, if the optimal coupling efficiency is not reached, it stops when looking for the axial maximum efficiency position, and then performs the offset directivity judgment and offset calculation to the other axial direction; Set the distance from the origin position to calculate the slope and return to the optimal coupling efficiency position.