CN109917516B - Compact wavelength division multiplexer - Google Patents
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Abstract
The invention discloses a novel compact wavelength division multiplexer, and belongs to the technical field of optical fiber communication. The compact wavelength division multiplexer comprises an incident optical fiber collimator, a first optical prism, a plurality of groups of filter plates and an emergent optical fiber collimator, wherein the first optical prism comprises a first side face, a second side face and a bottom face which are arranged in an isosceles manner, and the incident optical fiber collimator and the plurality of groups of filter plates are all arranged along the bottom edge of the main section of the first optical prism. According to the invention, the first optical prism is arranged to perform total reflection on the optical path between the filter and the incident optical fiber collimator and the emergent optical fiber collimator, so that the optical path is folded, and the wavelength division multiplexer based on the free space structure of the small-angle filter is obtained. Further, the second right-angle prism is arranged on the basis of the first optical prism, reflection of the two right-angle sides enables the outgoing optical fiber collimator to be uniformly arranged in two layers, the size is reduced to one half of the original size, the structure is compact, and the economic cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a novel compact wavelength division multiplexer.
Background
With the development of optical fiber communication technology, the WDM technology fully utilizes huge bandwidth resources of optical fiber low-loss wave bands, and the bandwidth is increased by several times or tens of times compared with single-band transmission, so that the WDM technology has great application value and economic value. In an optical communication system, miniaturization and high precision of a wavelength division multiplexer are required, and a filter design angle of a compact wavelength division multiplexing device is generally 13.5 °, 10 ° or 8 °, and the larger the angle is, the smaller the volume of the corresponding device is. There is currently a lack of small-volume dense wavelength division multiplexers based on free-space structures in the market.
In the existing scheme, a compact wavelength division multiplexer can be realized by utilizing a large-angle filter, and the compact wavelength division multiplexer is mainly used for realizing a coarse wavelength division multiplexer with larger channel separation, such as CWDM (channel spacing of 20 nm) and LAN-WDM (channel spacing of about 5 nm). Filters with small channel spacing, especially filters for Dense Wavelength Division Multiplexing (DWDM), have a large difference in filter characteristics for two beams of mutually perpendicular polarization states as the design angle increases, resulting in so-called polarization dependent losses. Because the development trend of the current optical communication technology is still smaller, faster and higher in density. For small-angle DWDM, it is necessary to have enough spatial dense arrangement of filters and collimators, and a long optical path, making compact devices difficult to implement.
The patent document with application publication number CN 105938222A discloses a compact wavelength division multiplexer based on a small-angle filter, which comprises a fixed support, a plurality of groups of filter plates, an output collimator, an input collimator and an optical reflector, wherein the plurality of filter plates sequentially transmit light with set wavelength and reflect the rest light, and also comprises at least one first right-angle prism; the first right-angle prism is arranged on the light path between the input collimator and the optical reflector and is used for totally reflecting the incident light from the input collimator so as to arrange the input collimator and the optical reflector in layers up and down; the first right-angle prism is arranged on an optical path between the optical reflector and the filter for totally reflecting the light beam between the optical reflector and the filter so that an output collimator for receiving the light transmitted by the filter and the optical reflector are arranged in layers up and down; the invention folds the light path for many times by arranging the right-angle prism in the light path, reduces the space occupied by each device and realizes a compact and small dense wavelength division multiplexing device.
How to further improve the structure of the wavelength division multiplexing device, shorten the optical path, reduce the volume of the wavelength division multiplexer, and at the same time maintain high precision is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a novel compact wavelength division multiplexing device which can effectively reduce the volume of the device, is suitable for a small-angle DWDM filter, has small size and compact structure, is provided with a single-side fiber outlet, can be directly integrated in a DWDM transceiver, and realizes high-speed transmission and reception.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a compact wavelength division multiplexer, includes incident optical fiber collimator, first optical prism, multiunit filter plate and emergent optical fiber collimator, first optical prism includes isosceles first side and second side and the bottom surface that set up, incident optical fiber collimator and multiunit filter plate all are arranged along first optical prism main section base, incident optical fiber collimator launches incident light, and the light beam is through first side and the second side reflection of first optical prism, multiunit filter plate transmission setting wavelength's light in proper order and reflection remaining light, and the remaining light of reflection is again through first side and the second side reflection of first optical prism to next filter plate, emergent optical fiber collimator is used for receiving the light beam that corresponds the filter plate transmission.
The included angles between the first side face and the bottom face and between the second side face and the bottom face are 45 degrees. According to the invention, the first optical prism is arranged, and the total reflection is carried out on the optical path between the filter and the incident optical fiber collimator and the emergent optical fiber collimator, so that the optical path is folded back and folded, and the wavelength division multiplexer based on the free space structure of the small-angle filter is obtained.
The working principle of the structure is shown in fig. 1, after the incident light collimator collimates light with N wavelengths, the light is refracted from the bottom surface A area of the first optical prism and enters the first optical prism, the complex light reaches the right angle surface S2 of the first optical prism and then is reflected to the right angle surface S1, the complex light reaches the bottom surface B area of the first optical prism, a plurality of filter plates are sequentially arranged in the bottom surface B area of the first optical prism, when the complex light reaches the first filter plate, the light with the set wavelength is transmitted by the first filter plate, the light with the rest wavelengths is reflected, the complex light is reflected by the S1 and the S2 until the light with the set wavelength is transmitted by the next filter plate, the light with the rest wavelengths is reflected, and the like, the light with the N wavelengths is separated and emitted in sequence, and the emergent optical fiber collimator is used for receiving the light beams transmitted by the corresponding filter plates.
For ease of manufacture and installation, it is preferred that the incident fiber collimators are on the sides of the exiting fiber collimators, with the collimators being densely arranged on the same plane. With small size filters, but ultimately limited as well as the diameter of the collimators for incidence and reception, the collimators are densely arranged, and the overall optical component junction is more compact and smaller in size.
Preferably, the bottom surface of the first optical prism is coated with an antireflection film in the incident light range, and a filter is disposed in the emergent light range.
In order to ensure that the loss of light power is minimum, an emergent light collimator is arranged at the light-emitting end of the filter, and the collimators can be adjusted one by one respectively.
All the filter plates are parallel to the bottom surface of the first optical prism, and preferably, the filter plates are directly adhered to the bottom surface, so that light is enabled to be incident on the filter plates at the same angle, and the central wavelength of each channel is enabled to meet the requirement.
Preferably, the first optical prism further comprises a top surface parallel to the bottom surface, a second right-angle prism is arranged on the top surface, and the main section of the second right-angle prism is perpendicular to the main section of the first optical prism.
Preferably, the second right-angle prism includes a first right-angle side reflecting surface and a second right-angle side reflecting surface, and the second right-angle prism totally reflects the light beam emitted from the top surface of the first optical prism, so that the emergent optical fiber collimator for receiving the light transmitted by the filter is arranged in layers up and down.
The bottom surface of the second right-angle prism is closely attached to the top surface of the first optical prism, and the main sections of the second right-angle prism and the first optical prism are mutually perpendicular. The working principle of the structure is shown in figure 3, after the incident light collimator collimates light with 2N (N is more than or equal to 4) wavelengths, the light is refracted from a bottom surface A area of a first optical prism II and enters the inside of the first optical prism, the complex color light reaches a right angle surface S2 of the first optical prism II and is reflected to a right angle surface S1, then the complex color light reaches a bottom surface B area of the first optical prism II, a plurality of filter plates are sequentially arranged in the bottom surface B area of the first optical prism II, when the complex color light reaches the first filter plate, the complex color light transmits light with a set wavelength lambda 1 and reflects light with other wavelengths, the complex color light is reflected by the S1 and the S2 until the light with the set wavelength lambda 2 is transmitted by the next filter plate and the light with other wavelengths is reflected, and the complex color light with N wavelengths is separated and emitted in sequence; the light reflected by the nth filter plate lambdan is reflected by the right angle surfaces S3 and S4 of the second right angle prism I, then is projected onto the bottom surface of the first optical prism, and the light wave of lambdan+1 is emitted by the (n+1) th filter plate lambdan+1, the light wave of lambdan+2 is reflected, the reflected light waves are reflected by the two right angle surfaces S1 and S2 of the first optical prism, and are projected and reflected on the filter plate of the bottom surface of the prism, so that the light wave of lambdan+2 is split and emitted, and the emergent optical fiber collimator is used for receiving the light beam transmitted by the corresponding filter plate.
The incidence angle and the incidence position of the incident light jointly determine the beam displacement caused by the signal light turning back once. The two layers of the emergent optical fiber collimators are uniformly arranged, N collimators are arranged on each layer, and the incident optical fiber collimators are flush with the top ends of other collimator lenses.
The invention arranges the first optical prism and the second right angle prism according to the positions of the main sections which are mutually perpendicular, thereby realizing the obtaining of the WDM with double-layer arrangement, and compared with the common filter type wavelength division multiplexer under the same incident angle condition, the volume can reach one half of the original volume, and the size of the wavelength division multiplexer is greatly reduced.
Preferably, the first side surface and the second side surface of the first optical prism and the first right-angle side reflecting surface and the second right-angle side reflecting surface of the second right-angle prism are coated with reflecting films. If the angle of the incident light is less than 1.8 degrees, the light is totally reflected on the right-angle surface, and the reflection surfaces may not be coated with a reflection film.
In order to improve the reliability of the device, preferably, the thermal expansion coefficients of the first optical prism, the second right angle prism and the filter plate are the same or similar, that is, the same or similar expansion coefficients of the components are adopted when the temperature is changed, the light path change caused by the size change of the device is avoided, and the stability of the device is improved.
Preferably, a refractive prism for adjusting the angle of the outgoing light is arranged on the light path between the filter sheet and the outgoing optical fiber collimator, so that the incoming optical fiber collimator is arranged in parallel with all outgoing optical fiber collimators. By arranging the refraction prism, all emergent light is emergent in parallel, and dense arrangement of collimators can be better realized.
Preferably, the refractive prism is wedge-shaped, the right-angle side of the wedge-shaped prism is parallel to the filter, and the hypotenuse of the wedge-shaped prism is arranged corresponding to the end face of the emergent optical fiber collimator.
The invention has the beneficial effects that:
(1) According to the invention, the first optical prism is arranged to perform total reflection on the optical path between the filter and the incident optical fiber collimator and the emergent optical fiber collimator, so that the optical path is folded, and the wavelength division multiplexer based on the free space structure of the small-angle filter is obtained.
(2) The invention sets the second right angle prism on the basis of the first optical prism, the reflection of the two right angle sides makes the outgoing optical fiber collimator arranged uniformly in two layers, combines the reflection of the first side and the second side of the first optical prism, folds the light path for many times, reduces the space, reduces the volume to one half of the original volume, can be directly integrated into the transceiver, compresses the volume of the wavelength division multiplexing equipment, and greatly reduces the economic cost.
In addition, the energy consumption is reduced, the temperature stability of the device is improved, each part adopts a tight packaging technology, the stability of the product is improved, and the storage and the transportation are convenient.
Drawings
Fig. 1 is a schematic diagram of a wavelength division multiplexer with a right angle prism based on a small angle according to the present invention.
Fig. 2 is a schematic perspective view of a wavelength division multiplexer according to embodiment 1.
Fig. 3 is a schematic diagram of the wavelength division multiplexer multi-channel principle based on the small-angle double right angle prism of the present invention.
Fig. 4 is a schematic perspective view of a wavelength division multiplexer in embodiment 2.
Fig. 5 is a schematic diagram of the front structure of the wavelength division multiplexer of embodiment 2.
Fig. 6 is a schematic diagram of the reverse structure of the wavelength division multiplexer of embodiment 2.
Fig. 7 is a schematic side view of the wavelength division multiplexer of embodiment 2.
Fig. 8 is a schematic diagram of the principle of the small angle-based wavelength division multiplexer with wedge prism according to the present invention.
Fig. 9 is a schematic diagram of the three-dimensional structure of the wavelength division multiplexer of embodiment 3.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Example 1
As shown in fig. 1 and 2, the wavelength division multiplexer of the present embodiment includes an incident optical fiber collimator 11, a right angle prism 12, a plurality of sets of filter plates 13, and an outgoing optical fiber collimator 14, where the right angle prism 12 has a first right angle side reflection surface S1, a second right angle side reflection surface S2, and a hypotenuse surface, the right angle prism 12 is bonded to a base plate 15, and the two right angle reflection surfaces of the right angle prism 12 are coated with a reflective film, and if the incident light angle is less than 1.8 degrees, the light can be totally reflected on the right angle surfaces without coating a reflective film. The components are used as the supporting bottom plate of the beam turning-back and transmission and output incidence optical fiber collimator, and are used as the main component of the compact dense wavelength division multiplexer.
The filter 13 is provided with four blocks so as to have four output bands λ1, λ2, λ3, λ4, respectively, bonded in order along the bottom side of the main section thereof on the hypotenuse face of the right angle prism 12. The light emitting end of each filter 13 is provided with an outgoing light collimator 14 for receiving the light beam transmitted by the corresponding filter. The entrance fiber collimator 11 and all the exit fiber collimators 14 are fixedly mounted on the base plate 15. The incident optical fiber collimators 11 and the emergent optical fiber collimators 14 are in the same plane by 5 pieces, the incident optical fiber collimators 11 are arranged on the side edges of the emergent optical fiber collimators 14, the incident optical fiber collimators 11 and 2 emergent optical fiber collimators are parallel to each other (the angle is about theta degrees), and the directions of the other two emergent optical fiber collimators are parallel to each other (the angle is about-theta degrees) and form a certain included angle with the former.
The incident optical fiber collimator 11 introduces multi-wavelength signal beams in an angle of alpha, the multi-wavelength signal beams are totally reflected by two right angle surfaces of the right angle prism 12, the signal beams are incident on the first filter 13 in the angle of alpha through the bevel edge surface of the right angle prism 12, the filter 13 allows light with the wavelength in a lambda 1 band to pass through, the emergent optical fiber collimator 14 receives the light with other wavelengths, the light reaches the filter with the lambda 2 band, the filter allows the light with the wavelength in the lambda 2 band to pass through, the corresponding emergent optical fiber collimator receives the light with other wavelengths, the light with other wavelengths is reflected on the filter with the lambda 3 band, the light with other wavelengths is received by the corresponding emergent optical fiber collimator, the light with other wavelengths is reflected on the filter with the lambda 4 band, the light with the wavelength in the lambda 4 band is allowed to pass through, the emergent optical fiber collimator receives the light with other wavelengths, and the light with other wavelengths is reflected back to the right angle prism 12, so that the dense wavelength multiplexing function of the DWDM device is realized.
Example 2
As shown in fig. 3-7, the wavelength division multiplexer according to the present embodiment adds a rectangular prism and the filter is provided with eight blocks, so that eight output bands are λ respectively 1 、λ 2 、λ 3 、λ 4 、λ 5 、λ 6 、λ 7 、λ 8 The rest of the structure is similar to that of embodiment 1.
Specifically, the wavelength division multiplexer of the present embodiment includes an incident optical fiber collimator 21, first and second right angle prisms 22 and 26, a plurality of sets of filter plates 23, and an exit optical fiber collimator 24.
The first optical prism 22 includes a first side surface S1 and a second side surface S2 which are disposed at an isosceles angle of 45 °, and top and bottom surfaces which are parallel to each other, the second right angle prism 26 includes a first right angle side reflection surface S3, a second right angle side reflection surface S4, and a hypotenuse surface, the hypotenuse surface of the second right angle prism 26 is closely attached to the top surface of the first optical prism 22, and the main section of the second right angle prism 26 is perpendicular to the main section of the first optical prism 22, and an upward segregation angle is generated after the incident light enters the second right angle prism 26, so that the light is three-dimensionally propagated in the first optical prism 22, and a double-layer arrangement is formed.
The first side surface S1 and the second side surface S2 of the first optical prism 22 and the first right-angle side reflection surface S3 and the second right-angle side reflection surface S4 of the second right-angle prism 26 are coated with reflective films. If the angle of the incident light is less than 1.8 degrees, the light is totally reflected on the right-angle surface, and the reflection surfaces may not be coated with a reflection film. The components are used as the supporting bottom plate of the beam turning-back and transmission and output incidence optical fiber collimator, and are used as the main component of the compact dense wavelength division multiplexer.
The filter 23 is provided with eight blocks and has eight inputsThe outgoing bands are respectively lambda 1 、λ 2 、λ 3 、λ 4 、λ 5 、λ 6 、λ 7 、λ 8 Two layers are sequentially bonded along the bottom side of the main section of the first optical prism 22. The light emitting end of each filter 23 is provided with an outgoing optical fiber collimator 24 for receiving the light beam transmitted by the corresponding filter.
The wavelength division multiplexer further comprises a bottom plate 25 for fixing the incident optical fiber collimator and the emergent optical fiber collimator, wherein the bottom plate 25 is adhered between two rows of filter sheets on the bottom surface of the first optical prism 22, the incident optical fiber collimator 21 and part of the emergent optical fiber collimator 24 are fixed on the upper surface of the bottom plate 25 and are positioned on the same plane, and the rest of the emergent optical collimators are fixed on the lower surface of the bottom plate 25 and are positioned on the same plane. Some of the outgoing fiber collimators are placed parallel to the incoming fiber collimators (at an angle of about θ°), and the rest of the outgoing fiber collimators form an angle (at an angle of about- θ°) with them. The surface of the base plate 25 bonded to the first optical prism 22 is coated with an antireflection film.
After light with 8 wavelengths is collimated by an incident light collimator, the light with 8 wavelengths is refracted from a bottom surface A area of a first optical prism and enters the first optical prism, the light with multiple colors reaches a right angle surface S2 of the first optical prism and then is reflected to a right angle surface S1, then the light with multiple colors reaches a bottom surface B area of the first optical prism, a plurality of filter plates are sequentially arranged in the bottom surface B area of the first optical prism, when the light with multiple colors reaches a first filter plate, the light with the set wavelength lambda 1 is transmitted and the light with the other wavelengths is reflected, the light with the set wavelength lambda 2 is reflected until the light with the other wavelengths is transmitted on the next filter plate through the reflection of the S1 and the S2, and the light with the other wavelengths is separated and emitted in turn; the light reflected by the 4 th filter sheet λ4 is reflected by the right angle surfaces S3 and S4 of the second right angle prism, and then projected onto the bottom surface of the first optical prism, and the light wave of λ5 is emitted by the 5 th filter sheet λ5, the light wave of λ6..λ8 is reflected, and the reflected light waves are projected and reflected on the filter sheet of the bottom surface of the first optical prism through the reflection of the two right angle surfaces S1 and S2 of the first optical prism, so that the light wave of λ6..λ8 is split and emitted, and the light beam transmitted by the corresponding filter sheet is received by the emergent optical fiber collimator.
The emission of the two right-angle sides of the second right-angle prism 26 makes the outgoing optical fiber collimator 24 uniformly arranged in two layers, combines the reflection of the first side surface and the second side surface of the first optical prism 22, folds the optical path for multiple times, reduces the space, reduces the volume to one half of the original volume, can be directly integrated into a transceiver, compresses the volume of wavelength division multiplexing equipment, and realizes the dense wavelength division multiplexing function of a DWDM device.
Example 3
As shown in fig. 8 and 9, the wavelength division multiplexer of the present embodiment is added with a wedge prism, and the rest of the structure is similar to that of embodiment 1.
Specifically, the wavelength division multiplexer of the present embodiment includes an incident optical fiber collimator 31, a right angle prism 32, a plurality of sets of filter plates 33, and an outgoing optical fiber collimator 34, where the right angle prism 32 has a first right angle side reflecting surface S1, a second right angle side reflecting surface S2, and a hypotenuse surface, the right angle prism 32 is bonded to the bottom plate 15, and the two right angle reflecting surfaces of the right angle prism 32 are coated with a reflecting film, and if the incident light angle is less than 1.8 degrees, the light can realize total reflection on the right angle surfaces without coating a reflecting film. The components are used as the supporting bottom plate of the beam turning-back and transmission and output incidence optical fiber collimator, and are used as the main component of the compact dense wavelength division multiplexer.
The filter 33 is provided with four blocks so as to have four output bands λ1, λ2, λ3, λ4, respectively, bonded in order along the bottom side of the main section thereof on the hypotenuse face of the right angle prism 32. An outgoing light collimator 34 is installed at the outgoing end of each filter 33, and is configured to receive the light beam transmitted by the corresponding filter. The incident optical fiber collimators 31 and all the emergent optical fiber collimators 34 are fixedly arranged on the bottom plate 35, 5 incident optical fiber collimators 31 and emergent optical fiber collimators 34 are in the same plane and are aligned on the end faces, and the connecting lines of the end faces of all the collimators are parallel to the hypotenuse face of the right-angle prism 32.
A wedge-shaped prism 36 (the wedge angle is delta) is arranged on the light path between part of the filter plate and the corresponding emergent optical fiber collimator, the wedge-shaped prism 36 is adhered to the bottom plate 35, the right-angle side of the wedge-shaped prism 36 is parallel to the filter plate and has a certain distance, the hypotenuse of the wedge-shaped prism is also a certain distance from the end face of the emergent optical fiber collimator, and the incident optical fiber collimator 31 is parallel to all the emergent optical fiber collimators 34 (the angle is about theta degrees).
The incident optical fiber collimator 31 introduces multi-wavelength signal beams at an angle of alpha, the multi-wavelength signal beams are totally reflected by two right angle surfaces of the right angle prism 32, the signal beams are incident on the filter 33 of the lambda 1 wave band at the angle of alpha through the hypotenuse surface of the right angle prism 32, the filter allows light with the wavelength in the lambda 1 wave band to pass through, the emergent optical fiber collimator 34 receives the light with other wavelengths, the light reaches the filter of the lambda 2 wave band, the filter allows the light with the wavelength in the lambda 2 wave band to pass through, the wedge prism 36 refracts the light with the wavelength in the lambda 2 wave band, the light with other wavelengths is received by the corresponding emergent optical fiber collimator, the light with other wavelengths is reflected by the filter of the lambda 3 wave band, the light with other wavelengths is allowed to pass through the corresponding emergent optical fiber collimator, the light with other wavelengths is allowed to pass through the filter of the lambda 4 wave band, the light with the wavelength in the lambda 4 wave band is received by the emergent optical fiber collimator, the light with other wavelengths is reflected by the wedge prism 36, and all the light with other wavelengths is enabled to pass through the wedge prism 36, so that all the light with the wavelength in the lambda 4 wave band can be emergent and the dense wavelength multiplexing function is better.
Claims (8)
1. The compact wavelength division multiplexer comprises an incident optical fiber collimator, a first optical prism, a plurality of groups of filter plates and an emergent optical fiber collimator, and is characterized in that the first optical prism comprises a first side face, a second side face and a bottom face which are isosceles, the included angles between the first side face and the bottom face are 45 degrees, the plurality of groups of filter plates are sequentially bonded on the bottom face of the first optical prism along the bottom edge of the main section of the first optical prism, and the emergent optical collimator is arranged at the light emitting end of each filter plate and used for receiving light beams transmitted by the corresponding filter plates; the incident optical fiber collimator and the emergent optical fiber collimator are in the same plane, the incident optical fiber collimator is arranged on the side edge of the emergent optical fiber collimator, the incident optical fiber collimator and part of the emergent optical fiber collimators are parallel to each other, and an included angle between the incident optical fiber collimator and the bottom surface of the first optical prism is delta; the directions of the emergent optical fiber collimators of the rest parts are parallel to each other, and the included angles between the emergent optical fiber collimators of the rest parts and the bottom surface of the first optical prism are all-delta;
the incident optical fiber collimator emits incident light, the light beams are reflected by the first side face and the second side face of the first optical prism, the plurality of groups of filter plates sequentially transmit light with set wavelength and reflect the rest light, and the rest reflected light is reflected to the next filter plate through the first side face and the second side face of the first optical prism.
2. The compact wavelength division multiplexer as recited in claim 1, wherein an incident light range of the bottom surface of the first optical prism is coated with an antireflection film, and an outgoing light range is provided with a filter.
3. The compact wavelength division multiplexer of claim 1 wherein the filter is affixed to the bottom surface of the first optical prism.
4. The compact wavelength division multiplexer as recited in claim 1, wherein said first optical prism further comprises a top surface parallel to said bottom surface, said top surface being provided with a second right angle prism, said second right angle prism comprising a first right angle side reflecting surface and a second right angle side reflecting surface and a hypotenuse side surface, the hypotenuse side surface of the second right angle prism being in close contact with the top surface of the first optical prism, said second right angle prism having a main cross section orthogonal to the main cross section of the first optical prism, the second right angle prism totally reflecting the light beam exiting from the top surface of the first optical prism such that the exit fiber collimator receiving the light transmitted by the filter is arranged in layers up and down.
5. The compact wavelength division multiplexer as recited in claim 4, wherein the first and second sides of the first optical prism and the first and second right angle side reflecting surfaces of the second right angle corner are coated with a reflective film.
6. The compact wavelength division multiplexer of claim 4 wherein the first and second right angle prisms and the filter plate have the same coefficient of thermal expansion.
7. The compact wavelength division multiplexer of claim 1 wherein a refractive prism for adjusting the angle of the outgoing light is disposed on the optical path between the filter and the outgoing fiber collimator such that the incoming fiber collimator is disposed in parallel with all outgoing fiber collimators.
8. The compact wavelength division multiplexer of claim 7 wherein the refractive prism is wedge-shaped, the right-angle side of the wedge-shaped prism is parallel to the filter, and the hypotenuse of the wedge-shaped prism is disposed opposite the end face of the exit fiber collimator.
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| CN112994828A (en) * | 2019-12-12 | 2021-06-18 | 福州高意通讯有限公司 | Small wavelength division multiplexer |
| CN111123436A (en) * | 2020-02-24 | 2020-05-08 | 福建天蕊光电有限公司 | Color light wavelength division multiplexing module for 5G application and assembling method thereof |
| CN111694101A (en) * | 2020-07-24 | 2020-09-22 | 奥普镀膜技术（广州）有限公司 | Miniature single-side light-emitting wavelength division multiplexing/demultiplexing device and optical module |
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