CN116859528A - Light coupling method of light emission sub-module - Google Patents
Light coupling method of light emission sub-module Download PDFInfo
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- CN116859528A CN116859528A CN202310914193.0A CN202310914193A CN116859528A CN 116859528 A CN116859528 A CN 116859528A CN 202310914193 A CN202310914193 A CN 202310914193A CN 116859528 A CN116859528 A CN 116859528A
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- converging lens
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- 238000010168 coupling process Methods 0.000 title claims abstract description 37
- 239000013307 optical fiber Substances 0.000 claims abstract description 57
- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000013519 translation Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
- G02B6/4225—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements by a direct measurement of the degree of coupling, e.g. the amount of light power coupled to the fibre or the opto-electronic element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4239—Adhesive bonding; Encapsulation with polymer material
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4244—Mounting of the optical elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides a light coupling method of a light emitting sub-module, which comprises the following steps: s1, installing and fixing a laser and an optical fiber adapter; s2, electrifying the laser, adjusting the positions of the converging lens in the X-axis, Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter, and recording that the position of the converging lens is P at the moment 0 The method comprises the steps of carrying out a first treatment on the surface of the S3, adjusting the position of the converging lens in the X-axis and Z-axis directions to a position P 1 The distance from the converging lens to the optical fiber adapter in the X-axis direction is the focal length F of the converging lens, and the center of the converging lens and the center of the fiber core of the optical fiber adapter in the Z-axis direction are positioned at the same height; dispensing and fixing the converging lens at position P 1 Where it is located. The invention uses the converging lens position P coupled to the maximum point of the optical power of the optical fiber adapter 0 To determine the final position P of the converging lens 1 The positioning accuracy is high, the influence of the mounting position of the laser and the optical fiber adapter on the coupling efficiency is greatly reduced, and the coupling efficiency of the optical power of the product is improved.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a light coupling method of a light emission sub-module.
Background
With the development of the optical communication industry, the data flow to be transmitted is larger and larger, the transmission rate requirement on the optical module is higher and higher, and the optical power requirement on the optical module is higher and higher, especially for the optical module for long-distance transmission, the light emitted by the laser is required to have high coupling efficiency through the lens and coupled into the optical fiber.
The optical path structure of the light emitting sub-module of a typical single-path optical module is shown in fig. 1, light emitted by a laser 1 is collimated by a collimating lens 2 and then converged into an optical fiber of an optical fiber adapter 5 by a converging lens 3, and an optical isolator 4 is usually placed between the converging lens 3 and the optical fiber adapter 5. In general, the coupling procedure of the lens of the light emitting sub-module shown in fig. 1 is as follows: s1, installing a laser 1, an optical isolator 4 and an optical fiber adapter 5; s2, powering on the laser 1, fixing the position of the converging lens 3 in the X-axis direction at the position where the distance from the optical center to the fiber core of the left end face of the optical fiber adapter 5 is the focal length F of the converging lens 3, adjusting the positions of the converging lens 3 in the Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter 5, and fixing the converging lens 3; and S3, powering the laser 1, adjusting the positions of the collimating lens 2 in the X-axis, Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter 5, and fixing the collimating lens 2 to finish coupling.
However, the conventional coupling method described above has the following problems:
1. the mounting position deviation and the angle deviation of the laser 1 may cause deviation between the coupling position of the converging lens 3 and the designed position, thereby affecting the coupling efficiency.
2. The coupling efficiency is affected by the positional deviation of the mounting of the optical fiber adapter 5.
3. In order to reduce the influence of the reflected light on the laser 1 on the fiber end face of the fiber adapter 5, the end face of the ferrule on the light incident side of the fiber adapter 5 is generally ground into an inclined plane with a certain angle, as shown in fig. 2, and the angle α of the inclined plane is generally 4-8 degrees; however, this bevel angle design also results in deviations of the actual position of the converging lens 3 when coupled from the designed position, resulting in a reduction of the optical power eventually coupled into the fiber adapter 5.
Disclosure of Invention
The invention aims to provide a light coupling method of a light emitting sub-module, which at least can solve part of defects in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a light coupling method of a light emitting sub-module comprises the following steps:
s1, installing and fixing a laser and an optical fiber adapter;
s2, electrifying the laser, adjusting the positions of the converging lens in the X-axis, Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter, and recording that the position of the converging lens is P at the moment 0 (X 0 ，Y 0 ，Z 0 )；
S3, adjusting the position of the converging lens in the X-axis and Z-axis directions to a position P 1 (X 0 +B，Y 0 ，Z 0 -C) bringing the converging lens to the fiber optic adapter distance F in the X-axis direction at the focal length of the converging lens, the center of the converging lens being at the same height as the center of the fiber core of the fiber optic adapter in the Z-axis direction; dispensing and fixing the converging lens at position P 1 Where it is located.
Further, the light coupling method of the light emitting sub-module further includes step S4 of placing a collimating lens between the laser and the converging lens, powering on the laser, adjusting the positions of the collimating lens in three directions of the X axis, the Y axis and the Z axis, so that the light power entering the optical fiber adapter reaches the maximum, and dispensing and fixing the collimating lens.
Further, in the step S2, the converging lens is located at a position P 0 When the laser device is used, the light outlet point of the laser device, the center of the converging lens and the center of the fiber core of the fiber adapter are on the same straight line.
Further, in the step S3, the converging lens is moved from the position P 0 Translate to position P 1 The X-axis direction translation distance B of (c) is calculated as follows: using a converging lens focal length calculation formulaCombining the design distance=a+b+f in the X-axis direction between the laser and the optical fiber adapter, so as to calculate the X-axis translation distance B of the converging lens; wherein F is the focal length of the converging lens, A is the position P 0 The distance between the converging lens and the laser along the X-axis direction.
Further, in the step S3, the converging lens is moved from the position P 0 Translate to position P 1 Distance of translation in Z-axis direction of (2)Wherein A is position P 0 The distance between the converging lens and the laser along the X-axis direction when in the position, B is the distance between the converging lens and the laser along the X-axis direction, and the position P of the converging lens 0 Translate to position P 1 Is the focal length of the converging lens, and beta is the focal length of the converging lens at position P 1 The incident light rays when the light coupled to the optical fiber adapter is emitted horizontally are included with the X-axis direction.
Further, the end face of the light entering side of the optical fiber adapter is an inclined plane with an alpha inclination angle, and beta is calculated according to a refractive index formula n=sin (alpha+beta)/sin alpha; where n is the core index of the fiber optic adapter.
Further, the step S1 further includes installing a fixed optical isolator between the laser and the optical fiber adapter, and the converging lens is disposed between the laser and the optical isolator in the step S2.
Compared with the prior art, the invention has the beneficial effects that:
(1) When the optical power of the optical fiber adapter is maximum, the spot size converged to the optical fiber adapter is almost equal to the diameter of the fiber core of the optical fiber adapter, and the positioning precision is very high, so that the positioning precision of the position of the converging lens is very high, the positioning precision of the position of the converging lens is greatly improved, and the coupling efficiency of products is improved.
(2) In the coupling method of the light emission sub-module, when the light power coupled into the adapter reaches the maximum, three points of the light outlet point of the laser, the center of the converging lens and the center of the fiber core of the optical fiber adapter are on the same straight line, so that even if the positions of the laser and the optical fiber adapter are stuck with small-amplitude deviations, the positions of the converging lens can be quickly found, the three points of the light outlet point of the laser, the center of the converging lens and the center of the fiber core of the optical fiber adapter are on the same straight line, and then the final position of the converging lens is determined according to the positions of the converging lens, thereby greatly reducing the influence of the mounting positions of the laser and the optical fiber adapter on the coupling efficiency and improving the coupling efficiency of the light power of products.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of an optical path structure of a conventional light emitting sub-module;
FIG. 2 is a schematic diagram of a fiber optic adapter;
FIG. 3 is a schematic diagram of the light path of the light coupling method of the light emitting sub-module of the present invention;
FIG. 4 is a schematic diagram of the optimal path of light incident upon a fiber optic adapter of the present invention.
Reference numerals illustrate: 1. a laser; 2. a collimating lens; 3. a converging lens; 4. an optical isolator; 5. and a fiber optic adapter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements 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.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or by an abutting connection or integrally connected; the specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 3 and 4, the present embodiment provides a light coupling method of a light emitting sub-module, which includes the following steps:
s1, installing and fixing the laser 1 and the optical fiber adapter 5.
Optionally, when the optical isolator 4 is disposed in the optical path of the optical emission sub-module, in this step, the optical isolator 4 is further installed between the laser 1 and the optical fiber adapter 5, and the converging lens 3 is placed between the laser 1 and the optical isolator 4 for coupling during the subsequent coupling process of the converging lens 3.
S2, powering the laser 1, adjusting the positions of the converging lens 3 in the X-axis, Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter 5, and recording that the position of the converging lens 3 is P 0 (X 0 ，Y 0 ，Z 0 )。
When the optical power coupled into the optical fiber adapter 5 reaches the maximum, as shown in fig. 3, the center of the converging lens 3 is on the line between the light exit point of the laser 1 and the center of the fiber core of the optical fiber adapter 5, the actual deviation is in the range of 1-2um, and the influence of the deviation on the subsequent calculation result is negligible, so that the three points of the light exit of the laser 1, the center of the converging lens 3 and the center of the fiber core of the optical fiber adapter 5 can be considered to be on a straight line; even if the laser 1 and the fiber adapter 5 are positioned with a small offsetThe difference, P of the converging lens 3 can also be found quickly 0 The positions are that the three points of the light outlet of the laser 1, the center of the converging lens 3 and the center of the fiber core of the fiber adapter 5 are on the same straight line; then according to the P of the converging lens 3 at the moment 0 The final position of the converging lens 3 is determined, so that the influence of the mounting positions of the laser 1 and the optical fiber adapter 5 on the coupling efficiency is greatly reduced, and the coupling efficiency of the optical power of the product is improved.
S3, adjusting the position of the converging lens 3 in the X-axis and Z-axis directions to a position P 1 (X 0 +B，Y 0 ，Z 0 C) the distance from the converging lens 3 to the optical fiber adapter 5 in the X-axis direction is set to the focal length F of the converging lens 3, and the center of the converging lens 3 and the center of the fiber core of the optical fiber adapter 5 are positioned at the same height in the Z-axis direction; dispensing and fixing the converging lens 3 at position P 1 Where it is located.
Alternatively, the position P of the converging lens 3 is determined by the maximum point of optical power in the present invention 0 To determine the final position P of the converging lens 3 1 By calculating the position P of the converging lens 3 relative to the converging lens 3 in the X-axis and Z-axis directions 0 Offset by distances B and C, the final coupling position of the converging lens 3 can be determined.
Specifically, the converging lens 3 is defined by a position P 0 Translate to position P 1 The X-axis direction translation distance B of (c) is calculated as follows: formula for calculating focal length by using converging lens 3In combination with the design distance l=a+b+f in the X-axis direction between the laser 1 and the fiber adapter 5, where F is the focal length of the converging lens 3 and a is the position P 0 At this point, the distance between the converging lens 3 and the laser 1 in the X-axis direction. In the above two calculation formulas, the design distance L in the X-axis direction between the laser 1 and the optical fiber adapter 5 and the focal length F of the converging lens 3 are known amounts, so that the X-axis direction translation distance B of the converging lens 3 can be calculated.
The converging lens 3 is moved from position P 0 Translate to position P 1 The Z-axis translation distance C is calculated as follows: as shown in fig. 3, a similar triangle is utilizedIt can be seen thatCalculated out->Wherein A is position P 0 The distance between the converging lens 3 and the laser 1 along the X-axis direction when in the position, B is the distance between the converging lens 3 and the laser 0 Translate to position P 1 Is the focal length of the converging lens 3, and β is the position P of the converging lens 3 1 The incident light rays when the light coupled to the fiber optic adapter 5 is emitted horizontally are angled with respect to the X-axis direction.
Further, in order to reduce the influence of the reflected light on the laser from the optical fiber end face of the optical fiber adapter 5, the optical fiber end face of the optical fiber adapter 5 on the light incident side is designed to be an inclined plane with an angle α, as shown in fig. 4, at this time, an optimal incident angle of the light coupled to the optical fiber adapter 5 is to be ensured, that is, the refracted light of the incident light after being refracted at the optical fiber core end face of the optical fiber adapter 5 is along the X axis direction, and according to the refractive index formula n=sin (θ+β)/sin γ, since θ=γ=α, n=sin (α+β)/sin α, so β can be calculated; where n is the core index of the fiber optic adapter 5.
In this embodiment, since the optical power coupled into the fiber adapter 5 is maximized (i.e., the condensing lens 3 is located at position P 0 Where) the spot size of the converging lens 3 to the fiber adapter 5 is almost the same as the core diameter of the fiber adapter 5, the positioning accuracy is very high, and the final position P of the converging lens 3 is obtained by theoretical calculation 1 Is in position P 0 The final position P of the converging lens 3 positioned in this way is thus shifted by the distance B and C in the X-axis, Z-axis direction for the reference point 1 The precision of the lens is very high, the positioning precision of the position of the converging lens 3 is greatly improved, and the coupling efficiency of products is improved.
S4, placing the collimating lens 2 between the laser 1 and the converging lens 3, powering on the laser 1, adjusting the positions of the collimating lens 2 in the X-axis, Y-axis and Z-axis directions, enabling the light power entering the optical fiber adapter 5 to be maximum, and dispensing and fixing the collimating lens 2.
The light coupling method of the light emitting sub-module of the present invention is described in the following by a specific embodiment, in which a distance l=22 mm (i.e. a+b+f=22 mm) in the X-axis direction between the laser 1 and the optical fiber adapter 5 is designed, the focal length f=2 mm of the converging lens 3, the inclination angle α=6 degrees of the light-entering side end face of the optical fiber adapter 5, and the core refractive index n=1.448 of the optical fiber adapter 5; the coupling process of the light emitting sub-module is thus as follows:
first, the stationary laser 1, the optical isolator, and the fiber adapter 5 are installed.
Then, the laser 1 is powered on to make the laser 1 emit light, and as shown in FIG. 3, the position of the converging lens 3 in the three directions of X-axis, Y-axis and Z-axis is adjusted to maximize the optical power coupled into the fiber adapter 5, and the position of the converging lens 3 at this time is recorded as P 0 (X 0 ，Y 0 ，Z 0 ) I.e. the position of the left converging lens 3 (converging lens shown in broken lines) in fig. 3.
According to theoretical calculation, since a+b+f=22mm, f=2mm, is brought intoB=0.22 mm; from n=1.448, α=6 degrees, taking into n=sin (α+β)/sin α, β≡2.7 degrees is calculated, and then according toC is calculated to be approximately 0.0094mm.
Thereafter, the converging lens 3 is denoted by P 0 Is translated to the position P for the datum point 1 (X 0 +0.22，Y 0 ，Z 0 0.0094), the right converging lens 3 (for realizing the converging lens shown) in fig. 3 is in place, dispensing and UV and baking the converging lens.
Finally, the laser 1 is electrified, the positions of the collimating lens 2 in the X axis, the Y axis and the Z axis are adjusted, so that the optical power entering the optical fiber adapter 5 is maximized, and then the collimating lens 2 is subjected to dispensing, UV and baking to fix the collimating lens 2.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (7)
1. The light coupling method of the light emitting sub-module is characterized by comprising the following steps of:
s1, installing and fixing a laser and an optical fiber adapter;
s2, electrifying the laser, adjusting the positions of the converging lens in the X-axis, Y-axis and Z-axis directions to maximize the optical power coupled into the optical fiber adapter, and recording that the position of the converging lens is P at the moment 0 (X 0 ，Y 0 ，Z 0 )；
S3, adjusting the position of the converging lens in the X-axis and Z-axis directions to a position P 1 (X 0 +B，Y 0 ，Z 0 -C) bringing the converging lens to the fiber optic adapter distance F in the X-axis direction at the focal length of the converging lens, the center of the converging lens being at the same height as the center of the fiber core of the fiber optic adapter in the Z-axis direction; dispensing and fixing the converging lens at position P 1 Where it is located.
2. The method of coupling light of a light emitting sub-module according to claim 1, further comprising the step of S4, placing a collimator lens between the laser and the converging lens, powering on the laser, adjusting the positions of the collimator lens in three directions of X-axis, Y-axis and Z-axis, maximizing the light power entering the fiber adapter, and dispensing and fixing the collimator lens.
3. The method for coupling light of a light emitting sub-module according to claim 1, wherein the converging lens is located at a position P in the step S2 0 When the laser device is used, the light outlet point of the laser device, the center of the converging lens and the center of the fiber core of the fiber adapter are on the same straight line.
4. The method for coupling light of a light emitting sub-module according to claim 1, wherein the converging lens in the step S3 is formed by a position P 0 Translate to position P 1 The X-axis direction translation distance B of (c) is calculated as follows: using a converging lens focal length calculation formulaCombining the design distance=a+b+f in the X-axis direction between the laser and the optical fiber adapter, so as to calculate the X-axis translation distance B of the converging lens; wherein F is the focal length of the converging lens, A is the position P 0 The distance between the converging lens and the laser along the X-axis direction.
5. The method for coupling light of a light emitting sub-module according to claim 1, wherein the converging lens in the step S3 is formed by a position P 0 Translate to position P 1 Distance of translation in Z-axis direction of (2)Wherein A is position P 0 The distance between the converging lens and the laser along the X-axis direction when in the position, B is the distance between the converging lens and the laser along the X-axis direction, and the position P of the converging lens 0 Translate to position P 1 Is the focal length of the converging lens, and beta is the focal length of the converging lens at position P 1 The incident light rays when the light coupled to the optical fiber adapter is emitted horizontally are included with the X-axis direction.
6. The method for coupling light of a light emitting sub-module according to claim 5, wherein the light incident side end face of the optical fiber adapter is an inclined plane with an angle α, and β is calculated according to a refractive index formula n=sin (α+β)/sin α; where n is the core index of the fiber optic adapter.
7. The method of coupling light of an optical transmitter sub-module according to claim 1, wherein the step S1 further comprises installing a fixed optical isolator between the laser and the optical fiber adapter, and the converging lens is placed between the laser and the optical isolator in the step S2.
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| CN202310914193.0A CN116859528A (en) | 2023-07-25 | 2023-07-25 | Light coupling method of light emission sub-module |
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| CN202310914193.0A CN116859528A (en) | 2023-07-25 | 2023-07-25 | Light coupling method of light emission sub-module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283171A (en) * | 2023-11-02 | 2023-12-26 | 成都储翰科技股份有限公司 | BOSA structure welding positioning monitoring method, system and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283171A (en) * | 2023-11-02 | 2023-12-26 | 成都储翰科技股份有限公司 | BOSA structure welding positioning monitoring method, system and storage medium |
| CN117283171B (en) * | 2023-11-02 | 2024-05-14 | 成都储翰科技股份有限公司 | BOSA structure welding positioning monitoring method, system and storage medium |
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