CN117908192A - Optical fiber input return light eliminating device - Google Patents
Optical fiber input return light eliminating device Download PDFInfo
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- CN117908192A CN117908192A CN202410305374.8A CN202410305374A CN117908192A CN 117908192 A CN117908192 A CN 117908192A CN 202410305374 A CN202410305374 A CN 202410305374A CN 117908192 A CN117908192 A CN 117908192A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 195
- 229940085805 fiberall Drugs 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims description 29
- 239000000835 fiber Substances 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 description 72
- 230000005540 biological transmission Effects 0.000 description 35
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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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
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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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
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses an optical fiber input return light eliminating device. Belongs to the technical field of optical fiber input equipment. The optical fiber reflection light source is characterized by comprising a collimation light input round table, a first convex lens, a second convex lens, a third convex lens and an outgoing optical fiber which are sequentially arranged at intervals from left to right, wherein the center line of the collimation light input round table, the left focus and the right focus of the first convex lens, the left focus and the right focus of the second convex lens, the left focus and the right focus of the third convex lens and the axial lead of the outgoing optical fiber all fall on the same horizontal straight line L. The collimating light input round table comprises an upper semi-cylindrical table and a lower semi-cylindrical table, and is formed by integrally connecting the upper semi-cylindrical table and the lower semi-cylindrical table.
Description
Technical Field
The invention relates to the technical field of optical fiber input equipment, in particular to an optical fiber input return light eliminating device.
Background
At present, when a plurality of optical signal light rays are incident to the input end of the same optical fiber, a collimating lens is generally adopted to directly inject the plurality of optical signal light rays which are parallel to each other to the input end of the optical fiber, and the plurality of optical signal light rays which are parallel to each other are not in a plane, so that the incident light rays of some optical signals and the axial lead of the optical fiber cannot fall in the same plane. When the incident light of a certain optical signal and the axial lead of the optical fiber cannot fall in the same plane, the light path of the light of the optical signal when propagating in the optical fiber cannot intersect with the axial lead of the optical fiber. The diameter of the optical fiber passes through the axial lead of the optical fiber, and in a plurality of sections of reflection light paths transmitted by the same optical signal light ray in the optical fiber, the length of each section of reflection light path is longest only when the reflection light path intersects with the axial lead of the optical fiber. Therefore, when the light of the optical signal is transmitted in the optical fiber, each section of reflection light path of each light of the optical signal is intersected with the axial lead of the optical fiber as much as possible, so that the transmission path of the light of the optical signal in the optical fiber is short, the number of reflection points of the light of the optical signal in the optical fiber transmission is small, and the optical fiber input return light eliminating device with small optical signal loss is very necessary.
CN201720278367.9 discloses a novel waterproof optical fiber connector, which comprises an optical fiber input end, a connecting rod, an optical fiber cold connector, a spiral connector, an output connecting wire and an optical fiber output end, wherein a waterproof rubber ring is nested in an inner ring of the optical fiber input port, a fastening mechanism is arranged on the outer side of the left end of the optical fiber cold connector, the novel waterproof optical fiber connector cannot eliminate the return light of each optical signal ray after being reflected at the optical fiber input end, and each section of reflected light path of each optical signal transmitted in the optical fiber is intersected with the optical fiber axial lead, and the return light cannot be eliminated.
Disclosure of Invention
The invention aims to solve the defects of the conventional optical fiber input return light eliminating device and provides the optical fiber input return light eliminating device. Each section of reflection light path for transmitting each optical signal in the optical fiber is intersected with the axis of the optical fiber. The return light of each optical signal ray reflected at the input end of the optical fiber can be eliminated. The optical fiber reflection light eliminator is convenient for a user to select the transmission time length of light in the optical fiber, and is convenient to install, simple to manufacture and high in reliability.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The optical fiber input return light eliminating device is characterized by comprising a collimation light input round table, a first convex lens, a second convex lens, a third convex lens and an outgoing optical fiber which are sequentially arranged at intervals from left to right, wherein the central line of the collimation light input round table, the left focus and the right focus of the first convex lens, the left focus and the right focus of the second convex lens, the left focus and the right focus of the third convex lens and the axial lead of the outgoing optical fiber all fall on the same horizontal straight line L. The collimating light input round table comprises an upper semi-cylindrical table and a lower semi-cylindrical table, and is formed by integrally connecting the upper semi-cylindrical table and the lower semi-cylindrical table. The lower semi-cylindrical table is provided with a plurality of fiber inserting holes which can irradiate light rays on the first convex lens horizontally towards the right, and each light ray irradiated on the first convex lens from each fiber inserting hole is parallel to a horizontal straight line L. The right focus of the first convex lens is overlapped with the left focus of the second convex lens, and the left end face of the lead-out optical fiber is positioned at the left side of the right focus of the third convex lens. The left end face of the outgoing optical fiber is a vertical plane, and the left end face of the outgoing optical fiber is perpendicular to the horizontal straight line L. Any light ray emitted from each fiber inserting hole horizontally to the right sequentially passes through the first convex lens, the second convex lens and the third convex lens and irradiates the left end face of the lead-out optical fiber, and the included angle between the light ray irradiated from the third convex lens to the left end face of the lead-out optical fiber and the horizontal straight line L is smaller than a set angle. After any light irradiated to the left end face of the extraction optical fiber is refracted on the left end face of the extraction optical fiber, the refracted light enters the extraction optical fiber and is continuously transmitted to the right by the extraction optical fiber. A reflected light eliminator is arranged between the third convex lens and the extraction optical fiber, and the reflected light eliminator does not shade the light irradiated onto the left end face of the extraction optical fiber from the third convex lens. After any light ray irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light ray is reflected outwards through the reflecting surface of the reflection back light eliminator. And the reflected light can not irradiate on the third convex lens nor the left end face of the lead-out optical fiber.
Preferably, the reflected light eliminator comprises a third plane reflector. The third plane reflector is arranged between the third convex lens and the outgoing optical fiber, and the reflecting surface of the third plane reflector is arranged towards the lower right.
Preferably, the upper end face of the third plane mirror is a horizontal plane, and the upper end face of the third plane mirror and the horizontal straight line L all fall in the same horizontal plane B.
Preferably, an intersection point at which the light beam from the third convex lens onto the left end face of the extraction fiber is reflected by the left end face of the extraction fiber and intersects with the horizontal straight line L is set as an a intersection point. The third plane reflector is positioned at the left side of the A intersection point. After any light ray irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light ray is reflected to the reflecting surface of the third plane reflector to be reflected outwards.
The invention can achieve the following effects:
The optical fiber input return light eliminating device can ensure that each section of reflection light path of each optical signal transmitted in the optical fiber is intersected with the axial lead of the optical fiber. When a plurality of optical signal rays are input into the same optical fiber for transmission, a user can select three quantities of the position of an incidence point of each optical signal ray at the input end of the optical fiber, the incidence angle at the incidence point and the incidence direction. The return light of each optical signal ray reflected at the input end of the optical fiber can be eliminated. The device is convenient for a user to select the transmission time length of light in the optical fiber, is convenient for installing the reflected light eliminator, and has simple manufacture and high reliability.
Drawings
Fig. 1 is a schematic diagram of a connection structure according to the present invention.
Fig. 2 is a schematic view of a partially enlarged connection structure according to the present invention.
Fig. 3 is a schematic view of a connection structure of the collimating light input cone of the present invention.
Fig. 4 is a schematic diagram of light transmission on the left end face of the optical fiber according to the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: the optical fiber is input into the return light eliminating device. See fig. 1-4. The collimating optical input round table comprises a collimating optical input round table g2, a first convex lens g4, a second convex lens g6, a third convex lens g7 and an outgoing optical fiber g25 which are sequentially arranged at intervals from left to right, and the central line of a lower semi-cylindrical table, the left focus and the right focus of the first convex lens, the left focus and the right focus of the second convex lens, the left focus and the right focus of the third convex lens and the axial lead of the outgoing optical fiber all fall on the same horizontal straight line Lg 13.
The collimating light input round table comprises an upper semi-cylindrical table g67 and a lower semi-cylindrical table g66, and is formed by integrally connecting the upper semi-cylindrical table and the lower semi-cylindrical table. The lower semi-cylindrical platform is provided with a plurality of fiber inserting holes g3 which can irradiate light rays on the first convex lens horizontally towards the right, and each light ray g14 irradiated on the first convex lens from each fiber inserting hole is parallel to a horizontal straight line L. The right focus g5 of the first convex lens is overlapped with the left focus of the second convex lens, and the left end surface g23 of the lead-out optical fiber is positioned at the left side of the right focus g12 of the third convex lens. The left end face of the outgoing optical fiber is a vertical plane, and the left end face of the outgoing optical fiber is perpendicular to the horizontal straight line L. Any light ray emitted from each fiber inserting hole horizontally to the right sequentially passes through the first convex lens, the second convex lens and the third convex lens and irradiates the left end face of the lead-out optical fiber, and the included angle between the light ray g21 emitted from the third convex lens to the left end face of the lead-out optical fiber and the horizontal straight line L is smaller than 8 degrees. After any light ray irradiated on the left end face of the extraction optical fiber is refracted on the left end face of the extraction optical fiber, the refracted light ray g24 enters the extraction optical fiber and is continuously transmitted to the right by the extraction optical fiber.
A reflected light canceller g26 is provided between the No. three convex lens and the extraction optical fiber, and the reflected light canceller does not block the light irradiated from the No. three convex lens onto the left end face of the extraction optical fiber. After any light ray irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light ray g22 is reflected outwards through the reflecting surface of the reflection back light eliminator. And the reflected light can not irradiate on the third convex lens nor the left end face of the lead-out optical fiber.
The reflected light eliminator comprises a third plane reflector g60. The third plane reflector is arranged between the third convex lens and the outgoing optical fiber, and the reflecting surface of the third plane reflector is arranged towards the lower right. The upper end face of the third plane reflector is a horizontal plane, and the upper end face of the third plane reflector and the horizontal straight line L are all located in the same horizontal plane B. Let the intersection point of the light beam from the third convex lens on the left end face of the extraction optical fiber, which is reflected by the left end face of the extraction optical fiber and intersects with the horizontal straight line L, be A intersection point g28. The third plane reflector is positioned at the left side of the A intersection point. After any light ray irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light ray is reflected to the reflecting surface of the third plane reflector to be reflected outwards.
Two ends of a shading shell tube g47 are distributed and hermetically connected on the right side end of the inner lower semi-cylindrical table and the left side end of the leading-out optical fiber, so that the right end face of the lower semi-cylindrical table, the first convex lens, the second convex lens, the third convex lens and the left side end of the leading-out optical fiber are hermetically shaded and arranged in the shading shell tube.
The focal length of the first convex lens is smaller than that of the third convex lens. The focal length of the second convex lens is smaller than that of the third convex lens.
In the present application, light signal, light ray, light signal light ray, signal are all the same meaning. For ease of description, these several words are sometimes often mixed.
The transmission of optical signals in optical fibers is mainly achieved by the principle of total reflection of light. The loss of the optical signal transmitted in the optical fiber is related to the use environment and the quality of the optical fiber, and the three factors of the path length of the optical signal in the optical fiber transmission, the number of reflection points and the positions of the reflection points are included.
The first factor is that the length of the light beam traveling in the fiber affects the loss of the optical signal. The longer the path of transmission, the greater the loss of the optical signal and the longer the path the longer the optical signal needs to be transmitted in the optical fiber, the greater the delay of the optical signal across the optical fiber, and thus it is necessary to reduce the path of light in the optical fiber transmission.
The second factor is that the number of reflection points of light in the fiber transmission also affects the optical signal loss. The optical signal is generally transmitted in the optical fiber after being reflected by countless reflecting points, but the optical signal is not necessarily totally reflected at each reflecting point, and the optical signal may be reflected by refractive light at some reflecting points. Reflection points where no total reflection occurs will produce refracted and reflected light. The refracted light causes a loss of the optical signal, which is transmitted in the fiber as a primary function of reflected light, and preferably total reflected light. Because the optical fiber can be bent in the use process, and the optical fiber can also generate uneven conditions between the fiber core and the cladding in the production process, the light rays at some reflection points generate refraction light in the optical fiber transmission process, and the light rays at the reflection points are not totally reflected. However, the use environment and the light quality of the optical fiber are basically fixed after the optical fiber line is built. Therefore, in order to reduce the loss of the optical signal in the optical fiber transmission, the transmission distance is further, and the number of reflection points of the light in the optical fiber transmission is necessary to be reduced.
A third factor is that the position of the reflection point of the light transmitted in the fiber also affects the optical signal loss. The position of the reflection point affects the two former factors, if each reflection point of a light signal ray is in the same plane with the axis of the outgoing optical fiber, at this time, each section of reflection ray of the light signal ray in the outgoing optical fiber is in the same plane with the axis of the outgoing optical fiber, so that the length of each section of reflection ray of the light signal ray in the outgoing optical fiber is longest, thus not only reducing the number of reflection points, but also making the transmission path shortest, and therefore, it is necessary to control the position of the reflection point of the light ray in the optical fiber transmission.
The path is in direct proportion to the light path. The two factors of the length of the optical signal path and the number of reflection points in the optical fiber transmission are related to the three factors of the position of the incidence point of the optical signal light at the input end of the optical fiber, the incidence angle at the incidence point and the incidence direction. The transmission path and transmission speed of the optical signal in the optical fiber can be different under different incident angles. The angle of incidence refers to the angle between the ray of the optical signal and the axis of the fiber.
When light of an optical signal at the input end of the optical fiber enters the optical fiber at a large incident angle, the optical signal can be reflected in the optical fiber for multiple times, and a tortuous transmission light path is displayed. The longer the transmission path, the greater the loss of the optical signal and the more likely the optical signal is distorted.
When the light of the optical signal at the input end of the optical fiber propagates along the axial lead of the optical fiber, the incident angle is zero, but the light of the optical signal input at the moment can generate echo at the input end of the optical fiber, namely return light, namely reflected light can return in the original path, the reflected light is overlapped on the original optical signal, and ghost can occur, so that the sensitivity of the optical signal can be influenced. Therefore, the application adopts the incident light incident on the left end face of the leading-out optical fiber and the included angle between the incident light and the axial lead of the optical fiber is smaller than 8 degrees. The left end face of the outgoing optical fiber is the input end face of the optical fiber.
When the light rays deviate from the axial line of the optical fiber, the incident angle changes, and the longer the light path appears, the more the refraction points are, and the transmission characteristics of the light signal light rays in the optical fiber at different incident angles are also different.
When the light signal light enters the optical fiber at a small incident angle, the number of times the light signal is refracted in the optical fiber is small, and the propagation distance of the light signal becomes longer. This is because a smaller angle of incidence reduces reflection and scattering between the optical signal and the light path, thereby reducing signal propagation losses.
The transmission speed of the optical signal light rays in the optical fiber at different incidence angles can also be different. When light enters a single-mode fiber at a large incident angle, the light signal is reflected for multiple times in the fiber and takes a folded transmission light path. As a result, the transmission speed of the optical signal decreases, resulting in an increase in the delay of signal transmission. Therefore, a smaller incident angle of the light signal light is adopted, so that the transmission speed and the instantaneity of the signal are ensured.
Transmission losses of optical signals in the optical fiber at different angles of incidence may also vary. As the angle of incidence increases, reflection and scattering between the optical signal and the optical fiber increases, resulting in increased transmission loss of the signal. Therefore, in an optical communication system, a smaller incident angle is selected in order to reduce transmission loss of signals.
As long as the included angle between any light ray injected into the left end face of the outgoing optical fiber and the axial lead of the optical fiber is smaller than 8 degrees. So that the incident light rays enter the optical signal toward the optical fiber in a semi-conical space g46 having an opening angle of 16 degrees.
When in use, the output ends of a plurality of single optical fibers g27 for transmitting single optical signals are inserted and connected in the fiber inserting holes one by one, and the light rays output from the single optical fibers can be horizontally irradiated on the first convex lens. The optical fiber for long distance transmission is connected to the right end face of the outgoing optical fiber, or the optical fiber for long distance transmission and the right end of the outgoing optical fiber are integrally welded and connected.
Therefore, each single optical signal irradiates the left end face of the leading-out optical fiber after passing through the first convex lens, the second convex lens and the third convex lens in sequence, the refraction light enters the leading-out optical fiber to continue to transmit to the right, the reflection light is reflected outwards through the reflection surface of the reflection back light eliminator, and the reflected light cannot irradiate the third convex lens nor the left end face of the leading-out optical fiber. In this embodiment, the included angle between each light ray irradiated onto the left end face of the extraction optical fiber and the horizontal straight line L is smaller than 8 degrees, and the reflected light ray is reflected. In the embodiment of the application, three factors of the position of the incidence point of the optical signal light on the input end face of the optical fiber, the incidence angle at the incidence point and the incidence direction are solved. The position of the incidence point of the optical signal light on the optical fiber input end face can be any position on the optical fiber input end face.
The magnitude of the incident angle of the light signal light ray at the incident point is only less than 8 degrees. The incident direction of the light signal light on the left end face of the outgoing optical fiber can be within 180 degrees around the horizontal straight line L. I.e. the range of incident light is within a half cone range class of 16 degrees.
When the light of the optical signal at the input end of the optical fiber propagates along the axial lead of the optical fiber, the incident angle is zero, but the light of the optical signal input at the moment can generate echo at the input end of the optical fiber, namely return light, namely reflected light can return in the original path, the reflected light is overlapped on the original optical signal, and ghost can occur, so that the sensitivity of the optical signal can be influenced. The present embodiment eliminates the reflected light reflected from the left end face of the extraction optical fiber from any one of the incident light rays by the reflected light eliminator.
In this embodiment, if the reflected light is not removed from the left end face of the outgoing light by the reflected light remover, the reflected light of the two optical signals arranged on the lower semi-cylindrical stage in a central symmetry manner may enter the mutual input optical paths to be reflected back, so as to affect the optical signals of the emitting end.
Since the left end face of the lead-out optical fiber is a vertical plane, and the left end face of the lead-out optical fiber is perpendicular to the horizontal straight line L. The left end face of the outgoing optical fiber is positioned at the left side of the right focus of the third convex lens. Each reflected ray on the left end face of the extraction fiber intersects the horizontal straight line L at the same a intersection point. So that each reflected light can be reflected out only by providing the reflected-light eliminator at or near the a-intersection, thereby realizing elimination of the problem of back light caused by the reflected light. The embodiment can eliminate the return light of each optical signal ray after being reflected at the optical fiber input end, and has good reliability.
The third plane reflector can reflect any light irradiated from the left end face of the lead-out optical fiber, and the reflected light cannot irradiate on the third convex lens or the left end face of the lead-out optical fiber. The influence of return light on light transmission is eliminated.
The cross point A is on the horizontal straight line L, and after any light ray irradiated to the left end face of the extraction optical fiber is reflected on the left end face of the extraction optical fiber, the reflected light ray passes through the cross point A. So that the light rays of each return light can be reflected by only arranging a third plane reflector which reflects towards the lower right at the right of the A intersection point.
In this embodiment, the upper end surface of the third plane mirror falls on the horizontal straight line L. The third plane reflector can well eliminate return light of each optical signal ray reflected by the optical fiber input end.
The embodiment can ensure that each section of reflection light path of each optical signal transmitted in the optical fiber intersects with the axial lead of the optical fiber, so that the length of each section of reflection light path of each light ray is as long as possible. When a plurality of optical signal rays are input into the same optical fiber for transmission, a user can select three quantities of the position of an incidence point of each optical signal ray at the input end of the optical fiber, the incidence angle at the incidence point and the incidence direction. The included angle of the incident light rays of the optical signal incident on the optical fiber input end is within 8 degrees of a set range, and the included angle can be freely selected by a user.
The device of the application is convenient for users to select the transmission time of light in the optical fiber, and is convenient for installing the reflected light eliminator, and has simple manufacture and high reliability.
Claims (6)
1. The optical fiber input return light eliminating device is characterized by comprising a collimation light input round table, a first convex lens, a second convex lens, a third convex lens and an outgoing optical fiber which are sequentially arranged at intervals from left to right, wherein the central line of the collimation light input round table, the left focus and the right focus of the first convex lens, the left focus and the right focus of the second convex lens, the left focus and the right focus of the third convex lens and the axial lead of the outgoing optical fiber all fall on the same horizontal straight line L; the collimating light input round table comprises an upper semi-cylindrical table and a lower semi-cylindrical table, and is formed by integrally connecting the upper semi-cylindrical table and the lower semi-cylindrical table; a plurality of fiber inserting holes capable of radiating light rays to the first convex lens horizontally towards the right are formed in the lower semi-cylindrical table, and each light ray radiating to the first convex lens from each fiber inserting hole is parallel to a horizontal straight line L; the right focus of the first convex lens is overlapped with the left focus of the second convex lens, and the left end face of the lead-out optical fiber is positioned at the left side of the right focus of the third convex lens; the left end face of the lead-out optical fiber is a vertical plane and is vertical to a horizontal straight line L; any light ray emitted from each fiber inserting hole horizontally to the right sequentially passes through the first convex lens, the second convex lens and the third convex lens and irradiates the left end face of the lead-out optical fiber, and the included angle between the light ray irradiated from the third convex lens to the left end face of the lead-out optical fiber and the horizontal straight line L is smaller than a set angle; after any light irradiated to the left end face of the extraction optical fiber is refracted on the left end face of the extraction optical fiber, the refracted light enters the extraction optical fiber and is continuously transmitted to the right by the extraction optical fiber; a reflected light eliminator is arranged between the third convex lens and the extraction optical fiber, and the reflected light eliminator does not shade light rays irradiated onto the left end face of the extraction optical fiber from the third convex lens; after any light irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light is reflected outwards through the reflecting surface of the reflection back light eliminator; and the reflected light can not irradiate on the third convex lens nor the left end face of the lead-out optical fiber.
2. The optical fiber input return light eliminating device according to claim 1, wherein the reflected return light eliminator comprises a No. three planar mirror; the third plane reflector is arranged between the third convex lens and the outgoing optical fiber, and the reflecting surface of the third plane reflector is arranged towards the lower right.
3. The optical fiber input return light eliminating device according to claim 2, wherein the upper end face of the No. three planar mirror is a horizontal plane, and the upper end face of the No. three planar mirror and the horizontal straight line L all fall within the same horizontal plane B.
4. The optical fiber input return light eliminating device according to claim 3, wherein an intersection point at which the light rays emitted from the third convex lens onto the left end face of the extraction optical fiber after being reflected by the left end face of the extraction optical fiber and intersecting with the horizontal straight line L is set as an a-intersection point; the third plane reflector is positioned at the left side of the A intersection; after any light ray irradiated to the left end face of the lead-out optical fiber is reflected on the left end face of the lead-out optical fiber, the reflected light ray is reflected to the reflecting surface of the third plane reflector to be reflected outwards.
5. The optical fiber input return light eliminating device according to claim 1, wherein the focal length of the first convex lens is smaller than the focal length of the third convex lens.
6. The optical fiber input return light eliminating device according to claim 1, wherein the focal length of the second convex lens is smaller than the focal length of the third convex lens.
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| CN117233895A (en) * | 2022-06-08 | 2023-12-15 | 山东华光光电子股份有限公司 | Optical fiber beam combining device |
| CN115598910A (en) * | 2022-12-13 | 2023-01-13 | 杭州中科极光科技有限公司（Cn） | Optical system for avoiding ablation of optical fiber end face and laser projection device |
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