阅读说明：本技术 一种自由空间多路波分复用装置及方法 (Free space multiplex wavelength division multiplexing device and method ) 是由 史磊 王思超 吴利敏 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种自由空间多路波分复用装置及方法,该装置包括缺角底板、垂直设于底板的缺角斜边上的输入准直器、分别设于底板上的多个输出准直器以及设于输出准直器中心轴线上的大角度滤光片；滤光片与对应的输出准直器之间设置有楔角片；多个输出准直器在底板的一侧等距、平行、间隔排列形成第一输出准直器组件；多个所述输出准直器在底板上所述第一输出准直器组件的相对侧等距、平行、间隔排列形成第二输出准直器组件；本发明利用反射原理和楔角片的折射原理形成自由空间的多路波分复用器,解决了为实现小型化波分复用时使用大角度滤光片方案造成设备调试成本高,无法实现自动化,不利于批量化生产的问题。(The invention discloses a free space multiplex wavelength division multiplexing device and a method, wherein the device comprises a unfilled corner bottom plate, an input collimator vertically arranged on the unfilled corner bevel edge of the bottom plate, a plurality of output collimators respectively arranged on the bottom plate and a large-angle optical filter arranged on the central axis of the output collimator; a wedge angle sheet is arranged between the optical filter and the corresponding output collimator; a plurality of output collimators are arranged at one side of the bottom plate at equal intervals, in parallel and at intervals to form a first output collimator assembly; a plurality of said output collimators are arranged in an equidistant, parallel and spaced apart arrangement on a base plate on opposite sides of said first output collimator assembly to form a second output collimator assembly; the invention utilizes the reflection principle and the refraction principle of the wedge angle sheet to form the multi-path wavelength division multiplexer of the free space, and solves the problems that the equipment debugging cost is high, the automation cannot be realized and the mass production is not facilitated because a large-angle optical filter scheme is used for realizing the miniaturized wavelength division multiplexing.)

1. A free-space multiplexed wavelength division multiplexing device, characterized by: including unfilled corner bottom plate (5), locate input collimator (1) on the unfilled corner hypotenuse of bottom plate (5), locate respectively a plurality of output collimator (2) on bottom plate (5), wherein:

the central axis of the input collimator (1) is perpendicular to the unfilled corner oblique edge;

the input end of each output collimator (2) is provided with a large-angle optical filter (3) at intervals;

a wedge angle sheet (4) is arranged between the large-angle optical filter (3) and the corresponding output collimator (2); the wedge angle sheet (4) can deflect the large-angle transmission light with the appointed wavelength passing through the large-angle optical filter (3) into small-angle transmission light to be further coupled into the corresponding output collimator (2);

a plurality of output collimators (2) are arranged at one side of the bottom plate (5) at equal intervals, in parallel and at intervals to form a first output collimator assembly;

a plurality of said output collimators (2) are arranged on said base plate (5) at equal, parallel and spaced apart intervals on opposite sides of said first output collimator assembly to form a second output collimator assembly.

2. The free-space wavelength division multiplexing device according to claim 1, wherein: the section of the wedge angle piece (4) is a right-angle trapezoid.

3. The free-space wavelength division multiplexing device according to claim 2, wherein: the inclined surface of the wedge angle sheet (4) faces the output collimator (2);

and the plane of the wedge angle sheet (4) is attached to the plane of the corresponding large-angle optical filter (3).

4. A free-space wavelength division multiplexing device according to any one of claims 1 to 3, wherein: the large-angle optical filter (3), the wedge angle sheet (4) corresponding to the large-angle optical filter (3) and the output collimator (2) corresponding to the wedge angle sheet (4) are all arranged on the same axis.

5. A free-space wavelength division multiplexing device according to any one of claims 1 to 3, wherein: and the output collimator (2) in the second output collimator assembly is arranged on the symmetry axis of any two adjacent output collimators (2) in the first output collimator assembly.

6. The free-space wavelength division multiplexing device according to claim 5, wherein: the number of output collimators (2) on the first and second output collimator assemblies is equal.

7. The free-space wavelength division multiplexing device according to claim 6, wherein: a plurality of said output collimators (2) are parallel to each other.

8. The free-space wavelength division multiplexing device according to claim 7, wherein: the input end of the output collimator (2) is arranged on the bottom plate (5) and faces towards the inside of the bottom plate, and the tail end of the output end is arranged outside the bottom plate (5) and faces towards the outside of the bottom plate.

9. The free-space wavelength division multiplexing device according to claim 1, wherein: the input end of the input collimator (1) is arranged outside the bottom plate and faces the outside of the bottom plate, and the output end of the input collimator is arranged inside the bottom plate and faces the inside of the bottom plate.

10. A free space multiplexing method, characterized by: use of a free-space wavelength division multiplexing device as claimed in any one of claims 1 to 9, comprising the steps of:

s100: incident light reaches the first wide-angle filter;

s200: the light with the specified wavelength passing through the first large-angle optical filter passes through a first wedge angle sheet corresponding to the first large-angle optical filter, is deflected into transmitted light with a small angle, and is coupled into a corresponding output collimator on the first output collimator assembly; the light with other wavelengths passing through the first large-angle filter is reflected to a corresponding second large-angle filter;

s300: the light with the designated wavelength reflected to the second large-angle optical filter is deflected into small-angle transmitted light through the corresponding second wedge angle sheet and is coupled into the corresponding output collimator on the second output collimator assembly; the light with the rest wavelengths reflected to the second large-angle filter is reflected to a third large-angle filter corresponding to the second large-angle filter through the second large-angle filter;

s400: the light with the specified wavelength reflected to the third large-angle filter is deflected into small-angle transmitted light through the corresponding third wedge angle piece and is coupled into the corresponding output collimator on the first output collimator assembly; the light with the rest wavelengths reflected to the third large-angle filter is reflected to the corresponding fourth large-angle filter through the third large-angle filter.

Technical Field

The embodiment of the invention belongs to the technical field of optical communication devices, and particularly relates to a free space multiplex wavelength division multiplexing device and a method.

Background

Sparse Wavelength Division multiplexing (CWDM), also called Coarse Wavelength Division multiplexing, is a Wavelength Division multiplexing method for an optical fiber metropolitan area network, and is proposed in consideration that the number of channels of the metropolitan area network is not as large as that of a backbone network, and the requirement for optical channel power is not high. The most important advantage of CWDM is low equipment cost, another advantage of CWDM is that the operating cost of the network can be reduced. The CWDM device has small volume, low power consumption, simple and convenient maintenance and convenient power supply, and can use a 220V alternating current power supply.

As an effective solution for increasing bandwidth capacity, wavelength division multiplexing technology widely uses a dielectric diaphragm solution. In order to realize multi-channel and multi-port wavelength division multiplexing, a plurality of independently packaged three-port devices need to be cascaded, and the internal fiber coiling space of the devices is considered, so that the miniaturized wavelength division multiplexing cannot be realized; in order to realize miniaturized wavelength division multiplexing, a large-angle optical filter scheme is widely used, so that CCWDM products are generally manufactured by a process debugging method of a main optical path and a secondary optical path.

The scheme of using the large-angle optical filter can cause the angle of transmitted light to be greatly beyond the normal light path debugging angle range, and higher requirements are put forward for the angle stroke specification of the tool clamp, so that the cost of debugging equipment is greatly increased; secondly, the operation difficulty of staff is greatly increased, automatic debugging cannot be realized, and the batch production is not facilitated. Therefore, an automatic wavelength division multiplexing device which has a simple structure, is convenient to install, occupies a small space by using a large-angle optical filter, is universal for equipment and a tool clamp, can realize multi-path automatic debugging and can meet the production requirement of rapid line change is urgently needed.

Disclosure of Invention

In view of the above drawbacks and needs of the prior art, the present invention provides a free space multiplexing device, which includes a base plate, a plurality of output collimators arranged on one side of the base plate at equal intervals and in parallel to form a first output collimator assembly, and a plurality of output collimators arranged on the opposite side of the base plate at equal intervals and in parallel to form a second output collimator assembly, wherein an input collimator is vertically disposed on a corner-lacking bevel of the base plate; the input end of each output collimator is provided with a large-angle optical filter, and a wedge angle sheet is arranged between the large-angle optical filter and the output collimator; the free-space multi-path wavelength division multiplexer is formed by utilizing a reflection principle and a refraction principle of wedge angle pieces through an input collimator, a plurality of large-angle optical filters which are arranged at equal intervals, a plurality of wedge angle pieces corresponding to the large-angle optical filters and a plurality of output collimators corresponding to the wedge angle pieces; the automatic CWDM cable-changing device is simple in structure, convenient to install, small in occupied space, universal in equipment and tool fixtures, capable of achieving multi-path automatic debugging and meeting the production requirement of rapid cable changing; the problems that the transmission light angle is large and exceeds the normal light path debugging angle range due to the fact that a large-angle light filter scheme is used for realizing miniaturized wavelength division multiplexing, the angle stroke specification of a work clamp is difficult to meet requirements, the equipment debugging cost is greatly increased, the operation difficulty of workers is large, automatic debugging cannot be realized, and batch production is not facilitated are solved.

In order to achieve the above object, according to one aspect of the present invention, there is provided a free space multiplexing device comprising a missing corner substrate, an input collimator provided on a missing corner hypotenuse of the substrate, and a plurality of output collimators provided on the substrate, respectively, wherein:

the central axis of the input collimator is perpendicular to the unfilled corner bevel edge;

the input end of each output collimator is provided with a large-angle optical filter at intervals;

a wedge angle sheet is arranged between the large-angle optical filter and the corresponding output collimator; the wedge angle sheet can deflect the large-angle transmission light with the specified wavelength passing through the large-angle optical filter into small-angle transmission light to be coupled into a corresponding output collimator;

a plurality of output collimators are arranged at one side of the bottom plate at equal intervals, in parallel and at intervals to form a first output collimator assembly;

a plurality of said output collimators are arranged in an equidistant, parallel, spaced apart arrangement on said base plate on opposite sides of said first output collimator assembly to form a second output collimator assembly.

Further, the section of the wedge angle piece is a right-angle trapezoid.

Further, the inclined surface of the wedge angle sheet faces the output collimator;

and the plane of the wedge angle piece is attached to the plane of the corresponding large-angle optical filter.

Furthermore, the large-angle optical filter, the wedge angle sheet corresponding to the large-angle optical filter, and the output collimator corresponding to the wedge angle sheet are all arranged on the same axis.

Further, the output collimator in the second output collimator assembly is arranged on the symmetry axis of any two adjacent output collimators in the first output collimator assembly.

Further, the number of output collimators on the first output collimator assembly and the second output collimator assembly is equal.

Further, a plurality of the output collimators are parallel to each other.

Further, the input end of the output collimator is on the bottom plate and faces the inside of the bottom plate, and the output end is outside the bottom plate and faces the outside of the bottom plate.

Further, the input end of the input collimator starts at the outside of the bottom plate and faces the outside of the bottom plate, and the output end of the input collimator starts at the inside of the bottom plate and faces the inside of the bottom plate.

According to another aspect of the present invention, there is provided a free space multiplexing method implemented by the free space multiplexing apparatus, comprising the steps of:

s100: incident light reaches the first wide-angle filter;

s200: the light with the specified wavelength passing through the first large-angle optical filter passes through a first wedge angle sheet corresponding to the first large-angle optical filter, is deflected into transmitted light with a small angle, and is coupled into a corresponding output collimator on the first output collimator assembly; the light with other wavelengths passing through the first large-angle filter is reflected to a corresponding second large-angle filter;

s300: the light with the designated wavelength reflected to the second large-angle optical filter is deflected into small-angle transmitted light through the corresponding second wedge angle sheet and is coupled into the corresponding output collimator on the second output collimator assembly; the light with the rest wavelengths reflected to the second large-angle filter is reflected to a third large-angle filter corresponding to the second large-angle filter through the second large-angle filter;

s400: the light with the specified wavelength reflected to the third large-angle filter is deflected into small-angle transmitted light through the corresponding third wedge angle piece and is coupled into the corresponding output collimator on the first output collimator assembly; the light with the rest wavelengths reflected to the third large-angle filter is reflected to the corresponding fourth large-angle filter through the third large-angle filter.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

(1) the invention relates to a free space multiplex wavelength division multiplexing device.A plurality of output collimators are arranged at equal intervals, in parallel and at intervals on one side of a bottom plate to form a first output collimator assembly by vertically arranging an input collimator on the unfilled oblique edge of the bottom plate; the input end of each output collimator is provided with a large-angle optical filter, and a wedge angle sheet is arranged between the large-angle optical filter and the output collimator; the free-space multi-path wavelength division multiplexer is formed by utilizing a reflection principle and a refraction principle of wedge angle pieces through an input collimator, a plurality of large-angle optical filters which are arranged at equal intervals, a plurality of wedge angle pieces corresponding to the large-angle optical filters and a plurality of output collimators corresponding to the wedge angle pieces; the automatic CWDM cable-changing device is simple in structure, convenient to install, small in occupied space, universal in equipment and tool fixtures, capable of achieving multi-path automatic debugging and meeting the production requirement of rapid cable changing; the problems that the transmission light angle is large and exceeds the normal light path debugging angle range due to the fact that a large-angle light filter scheme is used for realizing miniaturized wavelength division multiplexing, the angle stroke specification of a work clamp is difficult to meet requirements, the equipment debugging cost is greatly increased, the operation difficulty of workers is large, automatic debugging cannot be realized, and batch production is not facilitated are solved.

(2) The free space multiplex wavelength division multiplexing device is characterized in that a wedge angle sheet is arranged between a large-angle optical filter and an output collimator, the section of the wedge angle sheet is a right-angle trapezoid, large-angle transmission light passes through a right-angle surface of the wedge angle sheet and then is emitted from an inclined surface, and the angle of the transmission light is changed from the original alpha angle to a zero angle; in the process, the transmitted light passing through the alpha angle of the wedge angle sheet is changed into zero degree and is coupled into a corresponding output collimator; the angle of the coupler is basically consistent with that of a coupler of a conventional wavelength division multiplexer; therefore, the equipment and the tool clamp are universal, the automation equipment of the conventional wavelength division multiplexer can be directly used, the coupling requirement of a light path can be met, the large-angle clamp does not need to be replaced, the same equipment and the same tool clamp are used, and the matching debugging period and the cost of the equipment and the tool clamp are greatly saved.

(3) The free space multiplex wavelength division multiplexing device can preferentially assemble an input collimator, a large-angle optical filter, a wedge angle sheet and a bottom plate as one component; after the optical path coupling is carried out, the output collimator is assembled with the bottom plate, and the invention has the advantages of simple structure, convenient installation, small occupied space and higher practicability.

(4) The free space multiplex wavelength division multiplexing device has the advantages that the bottom plate is arranged in the unfilled corner mode, on one hand, the input collimator is convenient to fix, and on the other hand, the input collimator is fixed perpendicular to the beveled edge of the unfilled corner, so that the debugging time can be saved.

Drawings

FIG. 1 is a schematic structural diagram of a free-space wavelength division multiplexing device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the optical path of a free space wavelength division multiplexing device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an optical path of a wedge plate of a free space wavelength division multiplexing device according to an embodiment of the present invention;

fig. 4 is a flow chart illustrating a wavelength division multiplexing method of a free space multiplexing device according to an embodiment of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: 1-input collimator, 2-output collimator assembly, 21-first output collimator, 22-second output collimator, 23-third output collimator, 24-fourth output collimator, 25-fifth output collimator, 26-sixth output collimator, 27-seventh output collimator, 28-eighth output collimator, 3-large angle filter, 31-first large angle filter, 32-second large angle filter, 33-third large angle filter, 34-fourth large angle filter, 35-fifth large angle filter, 36-sixth large angle filter, 37-seventh large angle filter 37, 38-eighth large angle filter, 4-wedge angle piece, 41-first wedge angle piece, 42-second wedge angle piece, 43-third wedge angle piece, 44-fourth wedge angle piece, 45-fifth wedge angle piece, 46-sixth wedge angle piece, 47-seventh wedge angle piece, 48-eighth wedge angle piece and 5-bottom plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "provided," and "disposed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 3, the present invention provides a free space multiplexing device, which includes a missing corner bottom plate 5, an input collimator 1 disposed on a missing corner bevel edge of the bottom plate 5, a plurality of output collimators 2 respectively disposed on the bottom plate 5, and a large angle optical filter 3 disposed on a central axis of the output collimators 2; a wedge angle sheet 4 is arranged between the large-angle optical filter 3 and the corresponding output collimator 2; a plurality of said output collimators 2 are arranged equidistantly, in parallel and at intervals on one side of the base plate to form a first output collimator assembly, and a plurality of said output collimators 2 are arranged equidistantly, in parallel and at intervals on the opposite side of said first output collimator assembly on said base plate 5 to form a second output collimator assembly; the invention forms a free-space multi-path wavelength division multiplexer by utilizing the reflection principle and the refraction principle of the wedge angle sheets through one input collimator 1, a plurality of large-angle optical filters 3 which are arranged at equal intervals, a plurality of wedge angle sheets 4 corresponding to the large-angle optical filters 3 and a plurality of output collimators 2 corresponding to the wedge angle sheets 4; the automatic CWDM cable-changing device is simple in structure, convenient to install, small in occupied space, universal in equipment and tool fixtures, capable of achieving multi-path automatic debugging and meeting the production requirement of rapid cable changing; the problems that the transmission light angle is large and exceeds the normal light path debugging angle range due to the fact that a large-angle light filter scheme is used for realizing miniaturized wavelength division multiplexing, the angle stroke specification of a work clamp is difficult to meet requirements, the equipment debugging cost is greatly increased, the operation difficulty of workers is large, automatic debugging cannot be realized, and batch production is not facilitated are solved.

Further, as shown in fig. 1 and 2, the central axis of the input collimator 1 is perpendicular to the unfilled oblique side; the input end of each output collimator 2 is provided with a large-angle optical filter 3 at intervals; a wedge angle sheet 4 is arranged between the large-angle optical filter 3 and the corresponding output collimator 2; the large-angle optical filter 3, the wedge angle sheet 4 corresponding to the large-angle optical filter 3 and the output collimator 2 corresponding to the wedge angle sheet 4 are all arranged on a straight line.

The wedge angle sheet 4 can deflect the large-angle transmission light with the specified wavelength passing through the large-angle optical filter 3 into the small-angle transmission light, and then the transmission light is coupled into the corresponding output collimator 2.

Further, as shown in fig. 1 to 3, the wedge 4 has a right-angled trapezoid cross section; the plane of the wedge angle piece 4 is attached to the plane of the corresponding large-angle optical filter 3; the inclined surface of the wedge angle sheet 4 faces the output collimator 2; the large-angle transmission light passes through the right-angle surface of the wedge angle sheet 4 and then is emitted out from the inclined surface, and the angle of the transmission light is changed from the original alpha angle to a zero angle; in the process, because the refractive indexes of the right-angle surface and the inclined surface of the wedge angle sheet 4 are different, the transmitted light with the alpha angle is refracted on the right-angle surface of the wedge angle sheet 4, and the angle of the transmitted light is subjected to first angle deflection; then the transmitted light with the first angle deflection is deflected for a second angle when passing through the inclined plane of the wedge angle sheet 4, and the transmitted light angle after twice deflection is changed from the original alpha angle to zero; the angle of the coupler is basically consistent with that of a coupler of a conventional wavelength division multiplexer; therefore, the equipment and the tool clamp are universal, the automation equipment of the conventional wavelength division multiplexer can be directly used, the coupling requirement of a light path can be met, the large-angle clamp does not need to be replaced, the same equipment and the same tool clamp are used, and the matching debugging period and the cost of the equipment and the tool clamp are greatly saved.

Further, as shown in fig. 1 and 2, the bottom plate 5 is a rectangular plate with unfilled corners; the unfilled corner arrangement is convenient for fixing the input collimator 1 on one hand, and on the other hand, the input collimator 1 is fixed perpendicular to the unfilled corner bevel edge, so that the debugging time is saved; the input end of the input collimator 1 is arranged outside the bottom plate and faces the outside of the bottom plate, and the output end of the input collimator is arranged inside the bottom plate and faces the inside of the bottom plate; the input end of the output collimator 2 is on the bottom plate and faces the inside of the bottom plate, and the tail end of the output end is outside the bottom plate and faces the outside of the bottom plate.

Preferably, as shown in fig. 1 and 2, a plurality of said output collimators 2 are arranged in an equidistant, parallel and spaced arrangement on one side of said base plate 5 to form a first output collimator assembly; a plurality of said output collimators 2 are arranged equidistantly, in parallel, at intervals on said base plate 5 on opposite sides of said first output collimator assembly to form a second output collimator assembly; the output collimator 2 in the second output collimator assembly is arranged on the symmetry axis of any two adjacent output collimators 2 in the first output collimator assembly; the number of output collimators 2 on the first output collimator assembly is equal to the number of output collimators 2 on the second output collimator assembly; a plurality of said output collimators 2 are parallel to each other.

Preferably, as shown in fig. 1 and 2, the output collimators 2 of the first output collimator assembly are preferably four, respectively a first output collimator 21, a third output collimator 23, a fifth output collimator 25 and a seventh output collimator 27; the output collimators 2 of the second output collimator assembly are also preferably four, respectively a second output collimator 22, a fourth output collimator 24, a sixth output collimator 26, and an eighth output collimator 28; the second output collimator 22 is located on the symmetry axis of the first output collimator 21 and the third output collimator 23; the fourth output collimator 24 is located on the symmetry axis of the third output collimator 23 and the fifth output collimator 25; the sixth output collimator 26 is located on the symmetry axis of the fifth output collimator 25 and the seventh output collimator 27.

Preferably, as shown in fig. 1 and 2, the high angle filter 3 includes a first high angle filter 31, a second high angle filter 32, a third high angle filter 33, a fourth high angle filter 34, a fifth high angle filter 35, a sixth high angle filter 36, a seventh high angle filter 37, and an eighth high angle filter 38, corresponding to the output collimator 2; the large-angle optical filter 3 is a large-angle optical filter and is used for transmitting incident light with specified wavelength and reflecting light with other residual wavelengths to other corresponding large-angle optical filters; the first high angle filter 31 is on the central axis of the input collimator 1.

Preferably, as shown in fig. 1 and 2, the wedge segments 4 include a first wedge segment 41, a second wedge segment 42, a third wedge segment 43, a fourth wedge segment 44, a fifth wedge segment 45, a sixth wedge segment 46, a seventh wedge segment 47, and an eighth wedge segment 48, corresponding to the high angle filter 3; the wedge angle sheet 4 is used for deflecting the large-angle transmission light with the specified wavelength passing through the large-angle optical filter 3 into the small-angle transmission light to be further coupled into the corresponding output collimator 2.

Further, as shown in fig. 1 and fig. 2, the first large-angle filter 31, the second large-angle filter 32, and the eighth large-angle filter 38 correspond to the first output collimator 21 and the second output collimator 22, and the eighth output collimator 28 one by one, respectively; the first and second wedge angle pieces 41 and 42 are in one-to-one correspondence with the first and second large-angle filters 31 and 32, and the eighth wedge angle pieces 48 are in one-to-one correspondence with the first and second large-angle filters 38; the first output collimator 21 and the second output collimator 22 are in one-to-one correspondence with the first wedge angle piece 41 and the second wedge angle piece 42, and the eighth wedge angle piece 48 is in one-to-one correspondence with the second output collimator 22.

Further, as shown in fig. 2, after the incident light entering from the input collimator 1 passes through the first large-angle filter 31, the large-angle transmission light with the specified wavelength is deflected after passing through the wedge-angle sheet 41 to form small-angle transmission light, and then is coupled into the corresponding output collimator 21, and the light with the remaining other wavelengths is reflected to the second large-angle filter 32 through the first large-angle filter 31; the large-angle transmission light with the designated wavelength passing through the second large-angle filter 32 is deflected after passing through the wedge angle sheet 42 to form small-angle transmission light, and then is coupled into the corresponding output collimator 22, the light with the other wavelengths remaining after passing through the second large-angle filter 32 is reflected to the third large-angle filter 33, and so on, the light is sequentially and alternately coupled on the output collimators 2 of the first output collimator assembly and the second output collimator assembly, and the wavelength division multiplexing and the automatic coupling of a free space are formed.

The invention provides a debugging method of a free space multiplex wavelength division multiplexing device, which comprises the following steps:

firstly, vertically fixing an input collimator on the unfilled corner oblique edge of a bottom plate;

secondly, determining the position of a first large-angle filter on the bottom plate according to the position of the input collimator, and arranging the first large-angle filter on the central axis of the input collimator; determining the position of a corresponding first wedge angle sheet on the bottom plate according to the position of the first large-angle optical filter, and determining the position of a corresponding first output collimator on the bottom plate according to the position of the corresponding first wedge angle sheet;

thirdly, arranging the position of a second large-angle optical filter according to the light path direction of reflected light on the first large-angle optical filter, and sequentially arranging the positions of a second wedge angle sheet and a second output collimator on the bottom plate according to the position of the second large-angle optical filter;

fourthly, determining the position of a third optical filter according to the positions of the first optical filter and the second optical filter, and enabling the second optical filter to be positioned on the symmetry axis of the first optical filter and the third optical filter by utilizing the principle of the symmetry axis; sequentially determining and arranging the positions of all the optical filters, and determining and arranging the positions of the corresponding wedge angle pieces and the corresponding output collimators according to the position of each optical filter; finally, the base plates are respectively fixed with the base plates; thus, the free space demultiplexer is assembled.

The working principle of the free space multiplex wavelength division multiplexing device and the wavelength division multiplexing method provided by the invention comprise the following steps:

the method comprises the following steps that firstly, incident light input from an input collimator reaches a first large-angle optical filter;

secondly, the light with the specified wavelength passing through the first large-angle optical filter passes through a first wedge angle sheet corresponding to the first large-angle optical filter, is deflected into small-angle transmitted light, and is coupled into a corresponding output collimator on the first output collimator assembly; the light with other wavelengths passing through the first large-angle filter is reflected to a corresponding second large-angle filter;

thirdly, the light with the specified wavelength reflected to the second large-angle filter is deflected into small-angle transmitted light through the corresponding second wedge angle sheet and is coupled into the corresponding output collimator on the second output collimator assembly; the light with the rest wavelengths reflected to the second large-angle filter is reflected to a third large-angle filter corresponding to the second large-angle filter through the second large-angle filter;

fourthly, light with specified wavelength reflected to the third large-angle filter is deflected into small-angle transmitted light through the corresponding third wedge angle piece and is coupled into the corresponding output collimator on the first output collimator assembly; the light with the rest wavelengths reflected to the third large-angle filter is reflected to the corresponding fourth large-angle filter through the third large-angle filter.

Incident light input from the input collimator is sequentially and alternately output in the output collimators of the first output collimator assembly and the second output collimator assembly to form free-space wavelength division multiplexing and automatic coupling.

The invention vertically arranges an input collimator on the unfilled oblique edge of the bottom plate, arranges a plurality of output collimators at equal intervals, in parallel and at intervals on one side of the bottom plate to form a first output collimator assembly, arranges a plurality of output collimators 2 at equal intervals, in parallel and at intervals on the opposite side of the first output collimator assembly on the bottom plate 5 to form a second output collimator assembly, arranges a large-angle optical filter at the input end of each output collimator, arranges a wedge angle sheet between the large-angle optical filter and the output collimators, changes the transmission light of an alpha angle into zero angle, and is basically consistent with the angle of a coupler of a conventional Wavelength Division Multiplexer (WDM); the optical path coupling requirement can be met by directly using conventional WDM (wavelength division multiplexing) automation equipment, the same equipment and tool clamps are used without replacing a large-angle clamp, and the matching debugging period of the equipment and the tool clamps is greatly saved; the bottom plate adopts the unfilled corner setting, is convenient for on the one hand fix the input collimator, and on the other hand can save the debugging time with input collimator perpendicular to unfilled corner hypotenuse is fixed.

The invention forms the free-space multi-path wavelength division multiplexer by arranging the wedge angle sheet between the large-angle optical filter and the output collimator, and by using the reflection principle and the refraction principle of the wedge angle sheet through one input collimator, a plurality of large-angle optical filters which are arranged at equal intervals, a plurality of wedge angle sheets corresponding to the large-angle optical filters and a plurality of output collimators corresponding to the wedge angle sheets.

The automatic CWDM cable-changing device is simple in structure, convenient to install, small in occupied space, universal in equipment and tool fixtures, capable of achieving multi-path automatic debugging and meeting the production requirement of rapid cable changing; the problems that the transmission light angle is large and exceeds the normal light path debugging angle range due to the fact that a large-angle light filter scheme is used for realizing miniaturized wavelength division multiplexing, the angle stroke specification of a work clamp is difficult to meet requirements, the equipment debugging cost is greatly increased, the operation difficulty of workers is large, automatic debugging cannot be realized, and batch production is not facilitated are solved.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.