CN111694109B - Optical module and optical fiber laser coupling device - Google Patents
Optical module and optical fiber laser coupling device Download PDFInfo
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- CN111694109B CN111694109B CN201910194578.8A CN201910194578A CN111694109B CN 111694109 B CN111694109 B CN 111694109B CN 201910194578 A CN201910194578 A CN 201910194578A CN 111694109 B CN111694109 B CN 111694109B
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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
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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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
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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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
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
- G02B6/4208—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback using non-reciprocal elements or birefringent plates, i.e. quasi-isolators
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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
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
Abstract
The invention provides an optical module and an optical fiber laser coupling device, wherein the optical module comprises a laser, a first convergent lens, a cylindrical mirror, an isolator, a first optical filter and a first receiver; a first convergent lens and a first optical filter are sequentially arranged in the direction of a laser beam emitted by a laser; the cylindrical mirror and the isolator are arranged between the first convergent lens and the first optical filter, the light emergent surface of the cylindrical mirror is a plane, and the light incident surface has a preset radian relative to the light emergent surface; the cylindrical mirror is used for enabling the convergent light spot of the laser beam in the target direction to deviate; the target direction is a vertical direction or a horizontal direction, and the first optical filter is inclined relative to the target direction or inclined relative to the vertical direction of the target direction.
Description
Technical Field
The present invention relates to the field of optical communication technologies, and in particular, to an optical module and an optical fiber laser coupling device.
Background
In the optical communication industry, in order to ensure reasonable utilization of optical fiber resources, single-fiber bidirectional technology (two different wavelength band light beams are simultaneously transmitted in one optical fiber and include one transmitting light path and one receiving light path) and single-fiber three-way technology (three different wavelength band light beams are simultaneously transmitted in one optical fiber and include one transmitting light path and two receiving light paths) have been implemented in the related technologies, wherein the receiving light paths in the single-fiber bidirectional technology and the single-fiber three-way technology need to be completed by means of reflection of an optical filter with a certain inclination, for example, in the single-fiber three-way technology, please refer to fig. 1, the single-fiber three-way technology implements one-emitting and two-receiving, the wavelength λ 3 is transmitted, the wavelengths λ 1 and λ 2 are received, and two 45-degree optical filters are plated with different film layers, so that the optical filter 1 implements λ 1 reflection and λ 3 and λ 2 transmission functions; the filter 2 realizes the functions of lambda 2 reflection, lambda 3 and lambda 1 transmission.
However, in the process of implementing the present invention, the inventors found that: in the single-fiber bidirectional technique and the single-fiber three-way technique, light emitted by a laser passes through a light filter with a certain inclination besides a converging lens and an isolator, so that after the light emitted by the laser passes through the light filter with a certain inclination, the best focus of a converging light spot in the vertical direction cannot coincide with the best focus of a converging light spot in the horizontal direction, namely astigmatism is caused, for example, in the single-fiber three-way technique, referring to fig. 2, because parallel light does not enter the 45-degree light filter, and the inclination direction of the light filter is in the y-o-z plane (vertical direction), the best focus of a converging light spot in the y-o-z plane is not coincident with the best focus of a converging light spot in the x-o-z plane (horizontal direction), but is staggered by a certain distance in the z axis by Δ z (the best focus of a light spot in the y-o-z plane is close), that is, astigmatism is caused, and because a certain astigmatism value (i.e., Δ z) exists, referring to fig. 3, fig. 3 shows a change situation of a spot shape when an image plane moves along a z-axis (an assumed coordinate system is the same as that of fig. 2), so that the total converged spot cannot be imaged as a perfect spot but as a cross-shaped diffuse spot. The resulting problem is that the spots cannot be concentrated to a point and coupled into the fiber with high efficiency, resulting in low coupling efficiency.
Disclosure of Invention
In view of the above, the present invention provides an optical module and a fiber laser coupling device.
According to a first aspect of embodiments of the present invention, an optical module is provided, including a laser, a first converging lens, a cylindrical mirror, an isolator, a first optical filter, and a first receiver;
the first converging lens and the first optical filter are sequentially arranged in the direction of the laser beam emitted by the laser;
the cylindrical mirror and the isolator are arranged between the first converging lens and the first filter; the light emergent surface of the cylindrical mirror is a plane, and the light incident surface has a preset radian relative to the light emergent surface;
the first receiver is arranged in a vertical direction of the first filter; the first optical filter is provided with an inclination angle in advance, and the inclination angle is larger than 0 degree;
after being condensed by the first condensing lens, laser beams emitted by the laser are coupled into an optical fiber through the cylindrical mirror, the isolator and the first optical filter; the cylindrical mirror is used for enabling the convergent light spot of the laser beam in the target direction to deviate; the target direction is a vertical direction or a horizontal direction, and the first optical filter is inclined relative to the target direction or the first optical filter is inclined relative to a vertical direction of the target direction; and a first external laser beam output by the optical fiber is reflected by the first optical filter and coupled to the first receiver.
According to a second aspect of the embodiments of the present invention, there is provided an optical fiber laser coupling apparatus, the apparatus including the optical module of the first aspect and an optical fiber;
the optical fiber is used for transmitting the laser beam and the first external laser beam.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an optical module and an optical fiber laser coupling device, wherein the device comprises a laser, a first convergent lens, a cylindrical lens, an isolator, a first optical filter and a first receiver, wherein the first convergent lens and the first optical filter are sequentially arranged in the direction of laser beams emitted by the laser, the cylindrical lens and the isolator are arranged between the first convergent lens and the first optical filter, the light emergent surface of the cylindrical lens is a plane, and the light incident surface has a preset radian relative to the light emergent surface; the first receiver is arranged in the vertical direction of the first optical filter, and the first optical filter is preset with an inclination angle which is larger than 0 degree; according to the invention, by arranging the cylindrical mirror, when a laser beam emitted by a laser penetrates through the cylindrical mirror, a convergent light spot of the laser beam in a target direction deviates, the target direction is a vertical direction or a horizontal direction, and the first optical filter is inclined relative to the target direction, or the first optical filter is inclined relative to the vertical direction of the target direction, namely the target direction in which the laser beam penetrating through the cylindrical mirror deviates is related to the relative inclined direction of the optical filter, so that the astigmatism problem that the optimal focuses of the light spots in different directions do not coincide, which is brought by the optical filter, is corrected, and the coupling efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art single fiber triplexer technique as provided in the background;
FIG. 2 is a schematic diagram of astigmatism caused by a single-fiber three-way technique in the prior art provided by the background art;
fig. 3 is a schematic diagram of changes in the shape of an optical spot when an image plane moves along a z-axis after astigmatism is caused by a single-fiber three-dimensional technique in the prior art provided in the background art;
FIG. 4 is a block diagram of a light module according to an exemplary embodiment of the present invention;
fig. 5 is a partial block diagram of a second optical module according to an exemplary embodiment of the present invention;
FIG. 6 is a block diagram illustrating a third type of optical module in accordance with an exemplary embodiment of the present invention;
FIG. 7 is a block diagram illustrating a fourth optical module in accordance with an exemplary embodiment of the present invention;
fig. 8 is a partial block diagram illustrating a fourth optical module according to an exemplary embodiment of the present invention;
FIG. 9 is a block diagram illustrating a fifth light module in accordance with an exemplary embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating the change in spot shape as the image plane moves along the z-axis in accordance with an exemplary embodiment of the present invention;
FIG. 11 is a schematic diagram of a convex cylindrical mirror and a concave cylindrical mirror according to an exemplary embodiment of the present invention;
fig. 12 is a partial block diagram of a fourth optical module according to an exemplary embodiment of the present invention, shown from another perspective;
fig. 13 is a partial block diagram of a sixth optical module according to an exemplary embodiment of the present invention;
fig. 14 is a block diagram illustrating a seventh optical module according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In order to solve the problem that the optimal focal point of a convergent light spot in the vertical direction and the optimal focal point of a convergent light spot in the horizontal direction cannot be overlapped due to the fact that non-parallel light passes through a filter with a certain inclination in the conventional single-fiber bidirectional technology, the invention provides an optical module, as shown in fig. 4, the optical module comprises a laser 11, a first convergent lens 12, a cylindrical lens 13, an isolator 14, a first filter 15 and a first receiver 16.
The first converging lens 12 and the first optical filter 15 are sequentially arranged in the direction of the laser beam emitted by the laser 11; wherein the first focusing lens 12 is used for focusing the laser beam emitted by the laser 11.
The cylindrical mirror 13 and the isolator 14 are arranged between the first converging lens 12 and the first optical filter 15, and the light exit surface of the cylindrical mirror 13 is a plane, and the light entrance surface has a predetermined radian relative to the light exit surface; it should be noted that, the invention does not set any limitation on the relative placement positions of the cylindrical mirror 13 and the isolator 14, the cylindrical mirror 13 can be adaptively placed according to a specific actual space, in an example, taking fig. 4 as an example, the cylindrical mirror 13 can be arranged between the first focusing lens 12 and the isolator 14; in another example, the isolator 14 may also be disposed between the first focusing lens 12 and the cylindrical mirror 13.
The first receiver 16 is arranged in the vertical direction of the first filter 15; the first optical filter 15 is preset with an inclination angle, and the inclination angle is larger than 0 degree; the first optical filter 15 is configured to reflect a first external laser beam and transmit a laser beam emitted by the laser 11; the first extraneous laser beam output through the optical fiber is reflected by the first filter 15 and coupled to the first receiver 16, so that the first receiver 16 receives and processes the first extraneous laser beam.
In this embodiment, the laser beam emitted from the laser 11 is focused by the first focusing lens 12, and then coupled into an optical fiber through the cylindrical mirror 13, the isolator 14 and the first optical filter 15; the isolator 14 is used for transmitting the laser beam and preventing a first external laser beam in the opposite direction from transmitting; the cylindrical mirror 13 is used for offsetting a convergent light spot of the laser beam in the target direction; the target direction is a vertical direction or a horizontal direction, and it is satisfied that the first filter 15 is inclined with respect to the target direction, or the first filter 15 is inclined with respect to a vertical direction of the target direction; the distance of the deviation of the convergent spot of the laser beam in the target direction is determined based on the radius of the cylindrical mirror 13, and the radius of the cylindrical mirror 13 is determined based on the astigmatism value; wherein the astigmatism value is a distance between a best focus of a convergent light spot in a vertical direction and a best focus of a convergent light spot in a horizontal direction after a laser beam emitted from the laser 11 passes through the first filter 15 before the cylindrical mirror 13 is not used; the optical module can realize single-fiber bidirectional optical module, thereby eliminating astigmatism.
In one implementation, taking fig. 4 as an example, the cylindrical mirror 13 may be a convex cylindrical mirror 13, a convex surface of the convex cylindrical mirror 13 faces the first focusing lens 12, and a placement direction of the convex cylindrical mirror 13 is vertically placed with respect to a relative inclination direction of the first optical filter 15; it should be understood that, in the present application, there is no limitation on the relative inclination direction of the first optical filter 15, and the first optical filter 15 may be inclined with respect to the vertical direction or inclined with respect to the horizontal direction, please refer to fig. 4, assuming that the first optical filter 15 is inclined with respect to the y direction (vertical direction), the placing direction of the convex cylindrical mirror 13 in fig. 4 is vertically placed with respect to the vertical direction, the convex cylindrical mirror 13 can shift the convergent spot of the laser beam transmitted through the first optical filter 15 in the relative inclination direction, the distance of the shift of the convergent spot of the laser beam is determined based on the radius of the cylindrical mirror 13, the radius of the cylindrical mirror 13 is determined based on the astigmatism value, so that the best focus of the convergent spot of the laser beam transmitted through the first optical filter 15 in the relative inclination direction is moved forward, so as to counteract the problem of the backward shift of the best focus of the converged light spot of the laser beam which is transmitted through the first optical filter 15 in the relative inclined direction, thereby correcting the astigmatism problem caused by the optical filter that the best focuses of the light spots on different surfaces are not coincident, and improving the coupling efficiency.
In another implementation manner, referring to fig. 5, the cylindrical mirror 13 may be a concave cylindrical mirror 13, a concave surface of the concave cylindrical mirror 13 faces the first focusing lens 12, and a placement direction of the concave cylindrical mirror 13 is horizontally placed relative to a relative inclination direction of the first optical filter 15; it is to be understood that the present application does not limit the relative inclination direction of the first filter 15, and the first filter may be inclined with respect to the vertical direction or inclined with respect to the horizontal direction, as shown in fig. 5, assuming that the first filter 15 is inclined with respect to the y direction (vertical direction) and the placement direction of the concave cylindrical mirror 13 shown in fig. 5 is horizontally placed with respect to the vertical direction, the concave cylindrical mirror 13 may shift the convergent spot of the laser beam transmitted in the direction perpendicular to the relative inclination direction of the first filter 15 by a distance determined based on the radius of the cylindrical mirror 13, the radius of the cylindrical mirror 13 being determined based on the astigmatism value, so that the best focus of the convergent spot of the laser beam transmitted in the direction perpendicular to the relative inclination direction of the first filter 15 is shifted backward, the optical coupling device is overlapped with the optimal focus of the convergent facula which is caused by the first optical filter 15 and backwards moves by the laser beam which penetrates through the first optical filter in the relative inclined direction, thereby correcting the astigmatic problem that the optimal focuses of the facula on different surfaces are not overlapped caused by the optical filters, and improving the coupling efficiency.
In one embodiment, the first filter may be a 45 ° filter.
In an embodiment, please refer to fig. 6, the optical module further includes a second converging lens 17.
In the present embodiment, the second focusing lens 17 is disposed between the first filter 15 and the first receiver 16, and the second focusing lens 17 is configured to focus the first external laser beam reflected by the first filter 15; the first external laser beam output through the optical fiber is condensed by the second condensing lens 17 after being reflected by the first optical filter 15, and then is coupled into the first receiver 16, which is advantageous for improving the coupling efficiency.
In one example, the first condensing lens 12, the second condensing lens 17, the cylindrical mirror 13, the isolator 14, and the first filter 15 may all be quartz glass materials.
It should be noted that the optical module further includes a base (not shown in the figure) for placing the laser 11, a clamping tool (not shown in the figure) for clamping the first focusing lens 12, the cylindrical lens 13, the second focusing lens 17 and the first optical filter 15, and a placing device (not shown in the figure) for placing the isolator 14 and the first receiver 16, and the specific structure of the optical module may be adaptively set according to the specific types or models of the laser 11, the first focusing lens 12, the second focusing lens 17, the cylindrical lens 13, the first optical filter 15, the isolator 14 and the first receiver 16 in practical situations, which is not limited in this respect.
In a possible implementation manner, the optical module may further include a fiber groove (not shown in the figure) for placing an optical fiber, and a specific structure of the fiber groove may be adaptively set according to a model of an actually accessed optical fiber, which is not limited in this disclosure.
In view of the problem that the best focus of the focused light spot in the vertical direction and the best focus of the focused light spot in the horizontal direction cannot coincide due to the fact that the non-parallel light passes through the optical filter with a certain inclination in the conventional single-fiber three-way technology, the present invention also provides another optical module, as shown in fig. 7, the optical module includes a laser 11, a first focusing lens 12, a cylindrical mirror 13, an isolator 14, a first optical filter 15, a first receiver 16, a second optical filter 18, and a second receiver 19.
The first converging lens 12, the first optical filter 15 and the second optical filter 18 are sequentially arranged in the direction of the laser beam emitted by the laser 11; wherein the first focusing lens 12 is used for focusing the laser beam emitted by the laser 11.
The cylindrical mirror 13 and the isolator 14 are arranged between the combination of the first filter 15 and the second filter 18 and the first focusing lens 12, and the light exit surface of the cylindrical mirror 13 is a plane, and the light entrance surface has a predetermined radian relative to the light exit surface; it should be noted that the present invention does not limit the relative placement positions of the cylindrical mirror 13 and the isolator 14, and the cylindrical mirror 13 can be adaptively placed according to a specific actual space, in an example, taking fig. 7 as an example or referring to fig. 8, the cylindrical mirror 13 can be disposed between the first focusing lens 12 and the isolator 14; in another example, the isolator 14 may also be disposed between the first focusing lens 12 and the cylindrical mirror 13.
The first receiver 16 is arranged in the vertical direction of the first filter 15; the first optical filter 15 is preset with an inclination angle, and the inclination angle is larger than 0 degree; the first optical filter 15 is configured to reflect a first external laser beam, and transmit a laser beam emitted by the laser 11 and a second external laser beam; the first extraneous laser beam output through the optical fiber is reflected by the first filter 15 and coupled to the first receiver 16, so that the first receiver 16 receives and processes the first extraneous laser beam.
The second receiver 19 is arranged in the vertical direction of the second filter 18; the second optical filter 18 is preset with an inclination angle, and the inclination angle is larger than 0 degree; in one example, taking fig. 7 or 8 as an example, the second filter 18 may be disposed between the first filter 15 and the optical fiber; in another example, the second filter 18 may also be arranged between the combination of the cylindrical mirror 13 and the isolator 14 and the first filter 15; the second optical filter 18 is configured to reflect a second external laser beam, and transmit the laser beam emitted by the laser 11 and the first external laser beam; the second external laser beam output through the optical fiber is reflected by the second filter 18 and coupled to the second receiver 19, so that the second receiver 19 receives and processes the second external laser beam.
Note that the first filter 15 and the second filter 18 are inclined in the same direction, for example, as shown in fig. 7 or 8, and are inclined with respect to the y direction (vertical direction).
In an embodiment, the first filter 15 and the second filter 18 may be 45 ° filters, and in a possible implementation manner, taking fig. 7 or fig. 8 as an example, the first filter 15 and the second filter 18 are placed in directions perpendicular to each other; in another possible implementation manner, referring to fig. 9, the first filter 15 and the second filter 18 are disposed in parallel.
In this embodiment, the laser beam emitted from the laser 11 is focused by the first focusing lens 12, and then coupled into an optical fiber through the cylindrical mirror 13, the isolator 14, the first optical filter 15, and the second optical filter 18; the isolator 14 is used for transmitting the laser beam and preventing the first external laser beam and the second external laser beam in opposite directions from transmitting; the cylindrical mirror 13 is used for offsetting a convergent light spot of the laser beam in the target direction; the target direction is a vertical direction or a horizontal direction, and the first filter 15 and the second filter 18 are inclined with respect to the target direction, or the first filter 15 and the second filter 18 are inclined with respect to a vertical direction of the target direction, a distance of the convergent spot shift of the laser beam in the target direction is determined based on a radius of the cylindrical mirror 13, and the radius of the cylindrical mirror 13 is determined based on an astigmatism value; wherein the astigmatism value is a distance between a convergent light spot best focus in a vertical direction and a convergent light spot best focus in a horizontal direction after a laser beam emitted from the laser 11 passes through the first filter 15 and the second filter 18 before the cylindrical mirror 13 is not used; please refer to fig. 10, which is a schematic diagram illustrating a change of a shape of an optical spot when an image plane of the cylindrical mirror 13 moves along a z-axis (it should be noted that directions of coordinate systems assumed in all drawings of the present invention are the same as those in fig. 2), and it is apparent that an astigmatism eliminating function is realized by the optical module of the present invention capable of realizing a single-fiber three-direction.
In one implementation, referring to fig. 11, the cylindrical mirror 13 may be a convex cylindrical mirror 13, taking fig. 7, fig. 8, fig. 9 or fig. 12 as an example, the convex surface of the convex cylindrical mirror 13 faces the first focusing lens 12, and the placing direction of the convex cylindrical mirror 13 is vertically placed with respect to the relative inclination direction of the first filter 15 and the second filter 18, it is to be understood that, the present application does not limit the tilt directions of the first filter 15 and the second filter 18, the first filter 15 and the second filter 18 may be inclined with respect to the vertical direction, may be inclined with respect to the horizontal direction, for example, in fig. 12, the first filter 15 and the second filter 18 are inclined with respect to the y direction (vertical direction), and the convex cylindrical mirror 13 is placed vertically with respect to the vertical direction; the convex cylindrical mirror 13 can shift the convergent spot of the laser beam in the relative tilt direction transmitted through the first optical filter 15 and the second optical filter 18, the shift distance is determined based on the radius of the cylindrical mirror 13, and the radius of the cylindrical mirror 13 is determined based on the astigmatism value, so that the best focus of the convergent spot of the laser beam transmitted through the relative tilt direction is moved forward, the problem of the best focus movement of the convergent spot of the laser beam transmitted through the relative tilt direction caused by the first optical filter 15 and the second optical filter 18 is counteracted, and the astigmatism problem caused by the optical filters that the best focuses of the laser beams transmitted through the relative tilt direction are not coincident is corrected, and the coupling efficiency is improved.
In another implementation manner, referring to fig. 11 and 13, the cylindrical mirror 13 may be a concave cylindrical mirror 13, a concave surface of the concave cylindrical mirror 13 faces the first focusing lens 12, and a placement direction of the concave cylindrical mirror 13 is horizontally placed with respect to a relative inclination direction of the first optical filter 15 and the second optical filter 18, it can be understood that, in this application, no limitation is made to the inclination direction of the first optical filter 15 and the second optical filter 18, the first optical filter 15 and the second optical filter 18 may be inclined with respect to a vertical direction or inclined with respect to a horizontal direction, for example, in fig. 13, the first optical filter 15 and the second optical filter 18 are inclined with respect to a y direction (vertical direction), and the concave cylindrical mirror 13 is horizontally placed with respect to the vertical direction; the concave cylindrical mirror 13 may shift the convergent spot of the laser beam transmitted in the direction perpendicular to the relative inclination direction of the first optical filter 15 and the second optical filter 18 by an offset distance determined based on the radius of the cylindrical mirror 13, and the radius of the cylindrical mirror 13 is determined based on the astigmatism value, so that the best focus of the convergent spot of the laser beam transmitted in the direction perpendicular to the relative inclination direction is shifted backward to coincide with the best focus of the convergent spot shifted backward by the first optical filter 15 and the second optical filter 18, thereby correcting the astigmatism problem that the best focuses of the laser beams of different surface spots are not coincident with each other due to the optical filters, and improving the coupling efficiency.
In an embodiment, please refer to fig. 14, the optical module further includes a second converging lens 17.
In the present embodiment, the second focusing lens 17 is disposed between the first filter 15 and the first receiver 16, and the second focusing lens 17 is configured to focus the first external laser beam reflected by the first filter 15; the first external laser beam output through the optical fiber is condensed by the second condensing lens 17 after being reflected by the first optical filter 15, and then is coupled into the first receiver 16, which is advantageous for improving the coupling efficiency.
In an embodiment, please refer to fig. 14, the optical module further includes a third converging lens 20.
In the present embodiment, the third condensing lens 20 is disposed between the second filter 18 and the second receiver 19, and the third condensing lens 20 is configured to condense the second outgoing laser beam reflected by the second filter 18; the second external laser beam output through the optical fiber is condensed by the third condensing lens 20 after being reflected by the second optical filter 18, and then is coupled into the second receiver 19, which is advantageous for improving the coupling efficiency.
In one example, the first condensing lens 12, the second condensing lens 17, the third condensing lens 20, the cylindrical mirror 13, the isolator 14, the first filter 15, and the second filter 18 may all be quartz glass materials.
It should be noted that the optical module further includes a base (not shown in the figure) for placing the laser 11, a clamping tool (not shown in the figure) for clamping the first focusing lens 12, the cylindrical mirror 13, the second focusing lens 17, the third focusing lens 20, the first optical filter 15 and the first optical filter 15, respectively, and a placing device (not shown in the figure) for placing the isolator 14, the first receiver 16 and the second receiver 19, respectively, and the specific structure thereof can be adaptively set according to the specific types or models of the laser 11, the first focusing lens 12, the second focusing lens 17, the third focusing lens 20, the cylindrical mirror 13, the first optical filter 15, the second optical filter 18, the isolator 14, the first receiver 16 and the second receiver 19 in actual situations, the invention is not limited in this regard.
In a possible implementation manner, the optical module may further include a fiber groove (not shown in the figure) for placing an optical fiber, and a specific structure of the fiber groove may be adaptively set according to a model of an actually accessed optical fiber, which is not limited in this disclosure.
Correspondingly, referring to fig. 6 or fig. 14, the invention further provides an optical fiber laser coupling device, including the optical module and the optical fiber.
In the optical module implementing single-fiber bi-directional as shown in fig. 6, the optical fiber is used for transmitting the laser beam and the first external laser beam.
The laser beam emitted from the laser 11 is collected by the first focusing lens 12, and then coupled into the optical fiber through the cylindrical mirror 13, the isolator 14, and the first optical filter 15.
In the optical module implementing single-fiber three-way as shown in fig. 13, the optical fiber is used for transmitting the laser beam, the first external laser beam, and the second external laser beam.
The laser beam emitted by the laser 11 is collected by the first focusing lens 12, and then coupled into an optical fiber through the cylindrical mirror 13, the isolator 14, the first optical filter 15, and the second optical filter 18.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An optical module is characterized by comprising a laser, a first convergent lens, a cylindrical mirror, an isolator, a first optical filter and a first receiver;
the first converging lens and the first optical filter are sequentially arranged in the direction of the laser beam emitted by the laser;
the cylindrical mirror and the isolator are arranged between the first convergent lens and the first optical filter, the light emergent surface of the cylindrical mirror is a plane, and the light incident surface has a preset radian relative to the light emergent surface;
the first receiver is arranged in a vertical direction of the first filter; the first optical filter is provided with an inclination angle in advance, and the inclination angle is larger than 0 degree;
after being condensed by the first condensing lens, laser beams emitted by the laser are coupled into an optical fiber through the cylindrical mirror, the isolator and the first optical filter; the cylindrical mirror is used for enabling the convergent light spot of the laser beam in the target direction to deviate; the target direction is a vertical direction or a horizontal direction, and the first optical filter is inclined relative to the target direction or the first optical filter is inclined relative to a vertical direction of the target direction; and a first external laser beam output by the optical fiber is reflected by the first optical filter and coupled to the first receiver.
2. The light module of claim 1, further comprising: a second optical filter and a second receiver; the second optical filter is preset with an inclination angle which is larger than 0 degree;
the second receiver is arranged in a vertical direction of the second filter;
the second filter is arranged between the first filter and the optical fiber; alternatively, the first and second electrodes may be,
the second filter is arranged between the combination of the cylindrical mirror and the isolator and the first filter;
a second extraneous laser beam output through the optical fiber is reflected by the second optical filter and coupled to the second receiver.
3. The optical module according to claim 2, wherein the first filter and the second filter are both 45 ° filters;
the placing directions of the first optical filter and the second optical filter are mutually vertical; alternatively, the first and second electrodes may be,
the first optical filter and the second optical filter are arranged in parallel.
4. The optical module of claim 1, wherein the cylindrical mirror is disposed between the first converging lens and the isolator; alternatively, the first and second electrodes may be,
the isolator is disposed between the first focusing lens and the cylindrical mirror.
5. The optical module of claim 1, wherein the cylindrical mirror comprises a convex cylindrical mirror;
the convex surface of the convex cylindrical mirror faces the first convergent lens, and the placing direction of the convex cylindrical mirror is vertically placed relative to the relative inclination direction of the first optical filter.
6. The optical module of claim 1, wherein the cylindrical mirror comprises a concave cylindrical mirror;
the concave surface of the concave cylindrical mirror faces the first convergent lens, and the placing direction of the concave cylindrical mirror is horizontally placed relative to the relative inclination direction of the first optical filter.
7. The light module of claim 1, further comprising a second converging lens;
the second converging lens is arranged between the first filter and the first receiver;
the second converging lens is used for converging the first external laser beam reflected by the first optical filter.
8. The light module of claim 2, further comprising a third converging lens;
the third converging lens is arranged between the second filter and the second receiver;
the third condensing lens is used for condensing the second external laser beam reflected by the second optical filter.
9. The optical module according to any one of claims 7 and 8, wherein the first condensing lens, the second condensing lens, the third condensing lens, the cylindrical mirror, the isolator, the first filter, and the second filter are all made of a quartz glass material.
10. A fiber laser coupling device comprising the optical module according to any one of claims 1 to 9 and an optical fiber;
the optical fiber is used for transmitting the laser beam and the first external laser beam.
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| CN201910194578.8A CN111694109B (en) | 2019-03-14 | 2019-03-14 | Optical module and optical fiber laser coupling device |
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| CN201910194578.8A CN111694109B (en) | 2019-03-14 | 2019-03-14 | Optical module and optical fiber laser coupling device |
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| US4830454A (en) * | 1987-11-06 | 1989-05-16 | Siemens Aktiengesellschaft | Spherical planoconvex lens for optically coupling a semiconductor laser to an optical waveguide |
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| CN102761377A (en) * | 2012-06-28 | 2012-10-31 | 深圳市光为光通信科技有限公司 | Optical transceiver |
| CN106410581A (en) * | 2015-05-15 | 2017-02-15 | 恩耐公司 | Passively aligned crossed-cylinder objective assembly |
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|---|---|---|---|---|
| US4830454A (en) * | 1987-11-06 | 1989-05-16 | Siemens Aktiengesellschaft | Spherical planoconvex lens for optically coupling a semiconductor laser to an optical waveguide |
| CN1918498A (en) * | 2004-02-11 | 2007-02-21 | 3M创新有限公司 | Reshaping light source modules and illumination systems using the same |
| CN2876807Y (en) * | 2006-04-07 | 2007-03-07 | 深圳飞通光电子技术有限公司 | Single fiber bidirectional three port assembly |
| CN102598545A (en) * | 2009-09-30 | 2012-07-18 | 康宁公司 | Optical fiber end structures for improved multi-mode bandwidth, and related systems and methods |
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