CN113687472A - Small free space wavelength division multiplexer - Google Patents
Small free space wavelength division multiplexer Download PDFInfo
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- CN113687472A CN113687472A CN202010426224.4A CN202010426224A CN113687472A CN 113687472 A CN113687472 A CN 113687472A CN 202010426224 A CN202010426224 A CN 202010426224A CN 113687472 A CN113687472 A CN 113687472A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
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- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses a small free space wavelength division multiplexer which comprises a Z-Block, a lens array and an optical fiber array which are sequentially arranged, wherein according to one embodiment of the small free space wavelength division multiplexer, the Z-Block comprises a parallelogram substrate (parallel substrate), a right-angle prism, a plurality of filter plates and an anti-reflection glass plate. The plurality of filtering sheets and the anti-reflection glass sheet are sequentially fixed on the end face, close to the lens array, of the parallel substrate side by side, and the right-angle prism is fixed on the end face, far away from the lens array, of the parallel substrate. When an incident beam enters the lens array from one of the optical fibers of the optical fiber array, the incident beam is collimated and enters the Z-Block, is refracted into the Z-Block through the anti-reflection glass sheet on the Z-Block, is reflected back to the filter on the Z-Block by the right-angle prism arranged on the other side, and then is sequentially output to the lens array through the plurality of filters at different wavelengths and is coupled and output to the optical fiber array. The invention has the advantages of small size, simple structure, flexible assembly, simple debugging and easy expansion.
Description
Technical Field
The invention relates to the field of optical communication devices, in particular to a small free space wavelength division multiplexer.
Background
With the increasing living standard of the material, the demand of people for information consumption is continuously increasing. In order to provide services with high information capacity, communication carriers put increasing demands on the transmission capacity of optical fiber communication systems. The wavelength division multiplexing technology makes full use of the advantage that different wavelength optical signals can be transmitted in a single optical fiber, improves the information transmission capacity of the single optical fiber by several times to tens of times, and becomes an optimal technology for capacity expansion of an optical fiber transmission system.
The array waveguide grating technology widely applied to a wavelength division multiplexing system utilizes waveguides with different lengths to construct gradient phase shift of light waves, and the light waves are interfered at an emergent end and coupled into corresponding optical fibers so as to realize multiplexing and demultiplexing of the light waves. Despite the advantages of small size, high channel count and easy mass production, the arrayed waveguide grating technology still has the disadvantages of high insertion loss and high crosstalk. While cascading multiple three-port devices is another way to implement wavelength division multiplexing/demultiplexing, the three-port device cascading scheme, despite its advantages in crosstalk, still suffers from the disadvantages of limiting device miniaturization by the fiber coiling process and excessive insertion loss due to multiple fusion splices of the optical fibers.
Wavelength division multiplexers based on free-space thin-film filters have found wide application in modern optical networks because of their advantages of stable performance and low insertion loss. Compared with a three-port device cascading scheme, the wavelength division multiplexing technology based on the free space thin film filter reduces insertion loss while saving the optical fiber welding step. In a typical small-sized free-space wavelength division multiplexer, both incident light and emergent light are collimated and coupled by corresponding fiber collimators. However, the size of the free-space wavelength division multiplexer is difficult to continue to decrease due to the size of the fiber collimator.
Disclosure of Invention
In view of the situation of the prior art, the present invention aims to provide a small wavelength division multiplexer with compact structure, convenient expansion and debugging and high efficiency, so as to solve the problem of further miniaturization of the free space wavelength division multiplexer.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a compact free-space wavelength division multiplexer, comprising:
one side surface of the Z-Block is an optical signal transmission surface and is provided with a first transmission surface and a second transmission surface which are mutually spaced, the first transmission surface comprises a plurality of filters which are arranged side by side and have different working wavelengths, and the second transmission surface comprises an anti-reflection optical sheet;
the lens array is opposite to the first transmission surface and the second transmission surface of the Z-Block and is provided with lens units which correspond to the anti-reflection optical sheet and the plurality of filters one by one and are opposite to each other;
and the optical fiber array is opposite to the lens array and is provided with a plurality of sub optical fibers which correspond to the lens units of the lens array one by one.
As a possible implementation manner, further, the lens array is a 1 × 5 lens array, which is in one-to-one correspondence with the filter plate and the anti-reflection glass plate, and is used for collimating the incident light beam and focusing and coupling the emergent light beam; the filter plates are correspondingly four, and the anti-reflection optical plate is one.
As a preferred optional embodiment, preferably, the optical fiber array is a 1 × 5 optical fiber array, which includes a lower substrate with a V-shaped groove on one side, an upper substrate fixed on the upper end surface of the lower substrate, and five transmission optical fibers, wherein one side surface of the upper substrate is opposite to the lens array, the five transmission optical fibers are connected in the V-shaped groove of the lower substrate side by side and opposite to the other side surface of the upper substrate, four of the five transmission optical fibers correspond to four filters, and the remaining transmission optical fiber corresponds to an anti-reflection optical sheet; specifically, 1 channel of a 5-channel fiber array formed by five transmission fibers is used for transmitting an incident beam, and the remaining 4 channels are used for transmitting an emergent beam; or 4 channels for the transmission of the incident beam and the remaining 1 channel for the transmission of the outgoing beam.
As a possible implementation manner, the Z-Block, the lens array and the optical fiber array are fixed on a substrate.
In a preferred alternative embodiment, the other side of the Z-Block is preferably coated with a reflective film.
As a preferred optional embodiment, preferably, light correction wedge angle pieces which are in one-to-one correspondence with the plurality of filter pieces are further arranged between the Z-Block and the lens array, a supporting piece for fixing the light correction wedge angle pieces on the substrate is arranged at the lower parts of the light correction wedge angle pieces, and the light correction wedge angle pieces are used for correcting the directions of output light beams when the parallelism of the output light beams of the Z-Block does not meet a predetermined requirement; a wedge angle block and a gasket are arranged between the lens array and the optical fiber array, and the lens array, the wedge angle block, the gasket and the optical fiber array are sequentially and fixedly connected into a whole; the gasket can be a perforated glass sheet.
As a more preferable alternative, it is preferable that the light-correcting wedge angle piece is a cylindrical light-correcting wedge angle piece or a square light-correcting wedge angle piece.
As a preferred alternative embodiment of the Z-Block, preferably, the Z-Block includes a parallel substrate, a plurality of filter plates and an anti-reflection glass plate attached to one side surface of the parallel substrate, and a right-angle prism with an inclined surface fixed to the other side surface of the parallel substrate; namely, the plurality of filter plates and the anti-reflection glass are sequentially fixed on the end face, close to the lens array, of the parallel substrate side by side, and the right-angle prism is fixed on the end face, far away from the lens array, of the parallel substrate.
As a preferred alternative embodiment of the Z-Block, preferably, the Z-Block includes a parallel substrate, a plurality of filters attached to one side of the parallel substrate, and a wedge-shaped anti-reflection glass sheet; namely, the filters and the wedge-shaped anti-reflection glass are sequentially fixed on the end faces, close to the lens array, of the parallel substrates in parallel.
As a preferred alternative embodiment of Z-Block, preferably, said Z-Block comprises:
a pentagonal substrate having an inclined surface on one side thereof;
the filter plates are arranged on the side face of the pentagonal substrate, which is on the same side with the inclined plane at intervals;
and the parallel anti-reflection glass sheet is arranged on the inclined plane of the pentagonal substrate.
Namely, the plurality of filters are sequentially fixed on the end face, close to the lens array, of the pentagonal substrate side by side, and the anti-reflection glass sheet is fixed on the inclined face, close to the lens array, of the pentagonal substrate.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: according to the scheme, the combination of the Z-block, the lens array and the optical fiber array is utilized, the incident light beam and the emergent light beam are simultaneously integrated in the optical fiber array on the same side, and the structural size is reduced by half compared with that of the optical fiber array distributed on the different sides. In addition, the use of the array enables the scheme to have the advantages of simple structure, flexible assembly, simple and efficient debugging and easy expansion compared with the scheme of the fiber collimator.
Drawings
The invention will be further explained with reference to the drawings and the detailed description below:
FIG. 1 is a 3-dimensional schematic diagram of a structure according to example 1 of the present invention;
FIG. 2 is a schematic side view of the structure of embodiment 1 of the present invention;
FIG. 3 is a schematic top view of the structure of embodiment 1 of the present invention;
FIG. 4 is a 3-dimensional schematic view of a perforated glass sheet of example 1 of the present invention;
FIG. 5 is a schematic side view of a perforated glass sheet of example 1 of the present invention;
FIG. 6 is a schematic top view of a Z-block structure in embodiment 1 of the present invention;
FIG. 7 is a 3-dimensional schematic diagram of a structure according to example 2 of the present invention;
FIG. 8 is a schematic side view of the structure of example 2 of the present invention;
FIG. 9 is a schematic top view of the structure of example 2 of the present invention;
FIG. 10 is a 3-dimensional schematic view of a supporting groove of a light-correcting sheet in embodiment 2 of the present invention;
FIG. 11 is a schematic front view of a supporting groove of a light corrector plate in embodiment 2 of the present invention;
FIG. 12 is a 3-dimensional schematic view of a circular light-correcting wedge in example 2 of the present invention;
FIG. 13 is a schematic front view of a circular light-correcting wedge in embodiment 2 of the present invention;
FIG. 14 is a schematic side view of a circular light-correcting wedge in embodiment 2 of the present invention;
FIG. 15 is a 3-dimensional schematic view of a structure of a square light-correcting wedge;
FIG. 16 is a schematic structural front view of a square light-correcting wedge sheet;
FIG. 17 is a schematic side view of a square light-correcting wedge;
FIG. 18 is a 3-dimensional schematic diagram of a structure in example 3 of the present invention;
FIG. 19 is a schematic side view of the structure of embodiment 3 of the present invention;
FIG. 20 is a schematic top view of the structure of example 3 of the present invention;
FIG. 21 is a schematic top view showing the structure of Z-Block in example 3 of the present invention;
FIG. 22 is a 3-dimensional diagram of a structure according to example 4 of the present invention;
FIG. 23 is a schematic side view of the structure of embodiment 4 of the present invention;
FIG. 24 is a schematic top view of the structure of embodiment 4 of the present invention;
FIG. 25 is a 3-dimensional schematic diagram of a structure in example 5 of the present invention;
FIG. 26 is a schematic side view of the structure of example 5 of the present invention;
FIG. 27 is a schematic top view of the structure of example 5 of the present invention;
FIG. 28 is a schematic top view showing the structure of Z-Block in example 5 of the present invention;
FIG. 29 is a 3-dimensional diagram of a structure according to example 6 of the present invention;
FIG. 30 is a schematic side view of the structure of example 6 of the present invention;
fig. 31 is a schematic top view of the structure in embodiment 6 of the present invention.
Detailed Description
Example 1
As shown in one of fig. 1 to 6, the structure of the present embodiment includes a Z-Block 10, a lens array 11, a wedge Block 12, a spacer 13 (which may be a perforated glass sheet shown in fig. 4 or 5), and an optical fiber array 14, which are arranged in sequence;
the Z-Block 10 includes a parallelogram substrate (parallel substrate) 101, several filters 102, 103, 104, 105, an antireflection glass sheet 106, and a rectangular prism 107. The plurality of filters 102, 103, 104 and 105 and one anti-reflection glass sheet 106 are sequentially fixed on the end face, away from the lens array 11, of the parallelogram substrate 101 side by side, and the inclined plane of the right-angle prism 107 is fixed on the side face, away from the filters, of the parallelogram substrate 101; several filters 102, 103, 104, 105 are used to transmit light beams of a specific wavelength and reflect light beams of the remaining wavelengths.
An incident light beam enters the lens array 11 from one of the optical fibers 145 of the optical fiber array 14, is collimated by the lens array 11 and enters the Z-Block 10, and is reflected by the right-angle prism 107 on the other side onto the filters 102, 103, 104 and 105 after passing through the anti-reflection glass sheet 106 on the Z-Block 10 (it is shown in fig. 6 that it shows a schematic optical path propagation diagram of the Z-Block in this embodiment). The filter 102 and 105 sequentially output the light beams with different wavelengths to the lens array 11 and are coupled to the optical fibers 141, 142, 143 and 144 of the optical fiber array 14 for output.
As a connection form, the lens array 11, the wedge angle block 12, the gasket 13 and the optical fiber array 14 are sequentially bonded together, and the gasket 13 is used for realizing that the optical path at the coupling part is free of glue.
As another possible implementation form, the Z-Block 10, the lens array 11, and the optical fiber array 14 are all integrated on the same substrate 15, wherein the incident light beam and the emergent light beam are input or output on the same side of the optical fiber array 14.
In addition, an antireflection glass sheet 106 bonded to the Z-Block 10 is used to perform pitch correction on the light beam on the Z-Block 10 side so that the incident light beam and the outgoing light beam have the same pitch. The Z-Block 10 side is coated with a highly reflective film for reflecting 4 wavelengths of light onto the filters 102, 103, 104, 105.
The output beam parallelism of the Z-Block 10 of the embodiment is high, and 4 beams with different wavelengths emitted from the Z-Block can be coupled to the optical fiber array 14 for output with small insertion loss. The lens array 11 illustrated in the present embodiment is a 1 × 5 optical fiber array, and the implementation includes collimation of an incident light beam and focusing coupling of an emergent light beam.
The fiber array of this embodiment is a 1 × 5 array, and includes a lower substrate 147 with V-grooves, 5 fibers 141, 142, 143, 144, 145, and an upper substrate 146. The optical fiber 145 is used for transmitting an incident light beam, and the optical fibers 141, 142, 143, 144 are used for transmitting an emergent light beam. It should be noted that the small free space wavelength division multiplexer according to the present invention can be used as a wavelength division demultiplexer (Demux) or a wavelength division multiplexer (Mux).
Example 2
As shown in one of fig. 7 to 14, the structure of the present embodiment includes a Z-Block 10, a lens array 11, a wedge Block 12, a spacer 13 (which may be a perforated glass sheet in accordance with embodiment 1), and an optical fiber array 14, which are arranged in this order;
the Z-Block 10 comprises a parallelogram substrate 101, a plurality of filters 102, 103, 104 and 1055, an anti-reflection glass sheet 106 and a right-angle prism 107. The filters 102, 103, 104, 105 and an anti-reflection glass sheet 106 are sequentially fixed on the end face of the parallelogram substrate 101 away from the lens array 11 in parallel. Wherein, the filter plate 102 and 105 are used for transmitting the light beam with specific wavelength and reflecting the light beam with the rest wavelength.
The lens array 11, the wedge angle block 12, the gasket 13 and the optical fiber array 14 are sequentially bonded together, and the gasket 13 is used for realizing that an optical path at a coupling part is free of glue.
An incident light beam enters the lens array 11 from one optical fiber 145 of the optical fiber array 14, is collimated by the lens array 11 and enters the Z-Block 10, passes through the anti-reflection glass sheet 106 on the Z-Block 10 and is reflected to the filters 102, 103, 104 and 105 by the right-angle prism 107 on the other side. The filters 102, 103, 104, 105 output light beams of different wavelengths to the lens array 11 in sequence and are coupled to the outputs of the optical fibers 141, 142, 143, 144 of the optical fiber array 14.
The Z-Block 10, the lens array 11 and the fiber array 14 are all integrated on the same substrate 15, wherein the incident light beam and the emergent light beam are input or output on the same side of the fiber array 14.
An anti-reflection glass sheet 106 adhered on the Z-Block 10 is used for carrying out spacing correction on the light beam on the Z-Block 10 side so as to ensure that the spacing between the incident light beam and the emergent light beam is the same. The Z-Block 10 side is coated with a highly reflective film for reflecting 4 wavelengths of light onto the filters 102, 103, 104, 105.
When the parallelism of the output beam of the Z-Block 10 is insufficient, 4 beams exiting the Z-Block 10 need to be corrected for their spatial angle by adding the correction wedge tiles 17, 18, 19 and 110. Wherein the optical wedge correction sheets 17, 18, 19 and 110 are arranged between the Z-Block 10 and the lens array, and the corrected light beams are coupled to the output of the optical fiber array 14 through the lens array 11.
The lens array 11 and the optical fiber array 14 of this embodiment are the same as those of embodiment 1.
Fig. 10 and 11 are a 3-dimensional schematic view and a front view of the cylindrical light correcting wedge plate supporting groove 16, respectively.
Fig. 12 to 14 are a 3-dimensional schematic view, a front view and a side view of a cylindrical light correction wedge sheet, respectively. The cylindrical light correcting wedge angle piece arranged on the supporting groove 16 can correct light beams with any spatial angle through rotation.
Fig. 15 to 17 are a 3-dimensional schematic diagram, a front view schematic diagram and a side view schematic diagram of the structure of the square light-correcting wedge sheet respectively. The square wedge angle piece can correct 4 space angles, and has the advantages of convenient operation and low price.
Example 3
As shown in fig. 18 to 21, the structure of the present embodiment includes a Z-Block 20, a lens array 21, a wedge Block 22, a perforated glass sheet 23, and an optical fiber array 24, which are arranged in sequence;
the Z-Block 20 comprises a parallelogram substrate 201, a plurality of filters 202, 203, 204, 205 and a wedge-shaped anti-reflection glass plate 206. The plurality of filters 202, 203, 204 and 205 and the wedge-shaped anti-reflection glass sheet 206 are sequentially fixed on the end face, away from the lens array 21, of the parallelogram substrate 201 side by side. Wherein the filters 202, 203, 204, 205 are used to transmit light beams of a specific wavelength and reflect light beams of the remaining wavelengths.
The lens array 21, the wedge angle block 22, the gasket 23 and the optical fiber array 24 are sequentially bonded together, and the gasket 23 is used for realizing that an optical path at a coupling part is free of glue.
An incident light beam enters the lens array 21 from one optical fiber 245 of the optical fiber array 24, is collimated by the lens array 21 and enters the Z-Block 20, is refracted by the wedge-shaped anti-reflection glass sheet 206 on the Z-Block 20, and is reflected to the filters 202, 203, 204 and 205 by the high-reflection film on the other side. The filters 202, 203, 204, 205 sequentially output the light beams with different wavelengths to the lens array 21, and are coupled to the optical fibers 241 and 244 of the optical fiber array 24 for output.
The Z-Block 20, the lens array 21 and the fiber array 24 are all integrated on the same substrate 25, wherein the incident light beam and the emergent light beam are input or output on the same side of the fiber array 24.
The wedge-shaped anti-reflection glass sheet 206 adhered to the Z-Block 20 is used for performing pitch correction on the light beam on the Z-Block 20 side to ensure that the pitch of the incident light beam is the same as that of the emergent light beam. The Z-Block 20 side is coated with a highly reflective film for reflecting 4 wavelengths of light onto the filters 202, 203, 204, 205.
The parallelism of the output beams of the Z-Block 20 of the embodiment is high, and 4 beams with different wavelengths emitted from the Z-Block can be coupled to the optical fiber array 24 for output with small insertion loss. The lens array 21 shown in the figure of the present embodiment is a 1 × 5 optical fiber array, and the implementation includes collimation of the incident light beam and focusing coupling of the emergent light beam.
The optical fiber array of the present embodiment is a 1 × 5 array, and includes a lower substrate 247 with V-grooves, 5 optical fibers 241 and 245, and an upper substrate 246. Wherein the optical fiber 245 is used for transmitting an incident light beam, and the optical fibers 241, 242, 243, 244 are used for transmitting an emergent light beam. It should be noted that the small free space wavelength division multiplexer according to the present invention can be used as a wavelength division demultiplexer (Demux) or a wavelength division multiplexer (Mux).
Example 4
As shown in one of fig. 22 to 24, the present embodiment includes a Z-Block 20, a lens array 21, a wedge Block 22, a perforated glass sheet 23, and an optical fiber array 24, which are arranged in order;
the Z-Block 20 comprises a parallelogram substrate 201, several filters 202, 203, 204, 205 and a wedge-shaped anti-reflection glass plate 206. The plurality of filters 202 and 205 and the wedge-shaped anti-reflection glass 206 are sequentially fixed on the end face of the parallelogram substrate 201 far away from the lens array 21 in parallel. Wherein the filters 202, 203, 204, 205 are used to transmit light beams of a specific wavelength and reflect light beams of the remaining wavelengths.
The lens array 21, the wedge angle block 22, the gasket 23 and the optical fiber array 24 are sequentially bonded together, and the gasket 23 is used for realizing that an optical path at a coupling part is free of glue.
An incident beam enters the lens array 21 from one optical fiber 245 of the optical fiber array 24, is collimated by the lens array 21 and enters the Z-Block 20, passes through the wedge-shaped anti-reflection glass sheet 206 on the Z-Block 20 and is reflected to the filter 202-205 by the high-reflection film on the other side. The filter 202 and 205 sequentially output the light beams with different wavelengths to the lens array 21 and are coupled to the optical fibers 241, 242, 243 and 244 of the optical fiber array 24 for output.
The Z-Block 20, the lens array 21 and the fiber array 24 are all integrated on the same substrate 25, wherein the incident light beam and the emergent light beam are input or output on the same side of the fiber array 24.
The wedge-shaped anti-reflection glass sheet 206 adhered to the Z-Block 20 is used for performing pitch correction on the light beam on the Z-Block 20 side to ensure that the pitch of the incident light beam is the same as that of the emergent light beam. One side of the Z-Block 20 is coated with a high reflective film for reflecting 4 wavelengths of light onto the filter 202-205.
When the parallelism of the output beam of the Z-Block 20 is insufficient, the 4 beams exiting the Z-Block 20 need to have the correction wedge segments 27, 28, 29 and 210 added to correct their spatial angles. Wherein the collimating wedge segments 27, 28, 29 and 210 are disposed between the Z-Block 20 and the lens array, and the collimated beams are coupled out through the lens array 21 to the fiber array 24.
The lens array 21 and the optical fiber array 24 of this embodiment are the same as those of embodiment 3.
Example 5
As shown in one of fig. 25 to 28, the present embodiment includes a Z-Block 30, a lens array 31, a wedge Block 32, a perforated glass sheet 33, and an optical fiber array 34, which are arranged in this order;
with particular reference to fig. 28, the Z-Block 30 includes a pentagonal substrate 301 with an oblique angle at one side of the COM end, a plurality of filters 302, 303, 304, 305, and an anti-reflection glass sheet 306. The filters 302, 303, 304, 3055 and a parallelogram anti-reflection glass sheet (parallel anti-reflection glass sheet) 306 are fixed side by side in sequence on the end face of the pentagonal substrate 301 with an oblique angle far away from the lens array 31. Wherein, the filter 302 and 305 are used for transmitting the light beam with specific wavelength and reflecting the light beam with the rest wavelength.
The lens array 31, the wedge angle block 32, the gasket 33 and the optical fiber array 34 are sequentially bonded together, and the gasket 33 is used for realizing that an optical path at a coupling part is free of glue.
An incident light beam enters the lens array 31 from one optical fiber 345 in the optical fiber array 34, is collimated by the lens array 31 and enters the Z-Block 30, is refracted by the parallel anti-reflection glass sheet 306 on the Z-Block 30 and the oblique edge of the pentagonal substrate 301, and is reflected to the filters 302, 303, 304 and 305 by the high-reflection film on the other side. The filter 302 and 305 sequentially output the light beams with different wavelengths to the lens array 31 and are coupled to the optical fibers 341, 342, 343, 344 of the optical fiber array 34 for output.
The Z-Block 30, the lens array 31 and the fiber array 34 are all integrated on the same substrate 35, wherein the incident light beam and the emergent light beam are input or output on the same side of the fiber array 34.
The bevel angle of the COM end side of the Z-Block 30 pentagonal substrate 301 and the bonded anti-reflection glass sheet 306 are used for correcting the distance between the light beams on the Z-Block 30 side so as to ensure that the distance between the incident light beams and the emergent light beams is the same. The Z-Block 30 is coated with a highly reflective film on one side for reflecting 4 wavelengths of light onto the filters 302, 303, 304, 305.
The parallelism of the output beams of the Z-Block 30 of the embodiment is high, and 4 beams with different wavelengths emitted from the Z-Block 30 can be coupled to the optical fiber array 34 for output with small insertion loss. The lens array 31 shown in the figure of the present embodiment is a 1 × 5 optical fiber array, and the implementation includes collimation of the incident light beam and focusing coupling of the emergent light beam.
The fiber array of this embodiment is a 1 × 5 array, and includes a lower substrate 347 with V-grooves, 5 fibers 341, 342, 343, 345, and an upper substrate 346. Wherein the optical fiber 345 is used for transmitting an incident light beam, and the optical fibers 341, 342, 343, 344 are used for transmitting an emergent light beam. It should be noted that the small free space wavelength division multiplexer according to the present invention can be used as a wavelength division demultiplexer (Demux) or a wavelength division multiplexer (Mux).
Example 6
As shown in one of fig. 29 to 31, embodiment 6 of the present invention includes a Z-Block 30, a lens array 31, a wedge 32, a perforated glass sheet 33, and an optical fiber array 34, which are arranged in this order;
the Z-Block 30 comprises a pentagonal substrate 301 with an oblique angle at one side of the COM end, a plurality of filters 302, 303, 304 and 305 and an anti-reflection glass sheet 306. The filters 302, 303, 304 and 305 and the anti-reflection glass sheet 306 are fixed side by side in sequence on the end face of the pentagonal substrate 301 with the oblique angle far away from the lens array 31. Wherein the filters 302, 303, 304, 305 are used for transmitting light beams of specific wavelengths and reflecting light beams of the remaining wavelengths.
The lens array 31, the wedge angle block 32, the gasket 33 and the optical fiber array 34 are sequentially bonded together, and the gasket 33 is used for realizing that an optical path at a coupling part is free of glue.
An incident light beam enters the lens array 31 from one optical fiber 345 in the optical fiber array 34, is collimated by the lens array 31 and enters the Z-Block 30, passes through the anti-reflection glass sheet 306 on the Z-Block 30 and is reflected to the filters 302, 303, 304 and 305 by the high-reflection film on the other side. The filters 302, 303, 304, 305 sequentially output the light beams with different wavelengths to the lens array 31, and are coupled to the optical fibers 341 and 344 of the optical fiber array 34 for output.
The Z-Block 30, the lens array 31 and the fiber array 34 are all integrated on the same substrate 35, wherein the incident light beam and the emergent light beam are input or output on the same side of the fiber array 34.
The bevel angle of the COM end side of the Z-Block 30 pentagonal substrate 301 and the bonded anti-reflection glass sheet 306 are used for correcting the distance between the light beams on the Z-Block 30 side so as to ensure that the distance between the incident light beams and the emergent light beams is the same. The Z-Block 30 is coated with a highly reflective film on one side for reflecting 4 wavelengths of light onto the filters 302, 303, 304, 305.
When the parallelism of the output beam of the Z-Block 30 is insufficient, the 4 beams exiting the Z-Block 30 need to have the correction wedge segments 37, 38, 39 and 310 added to correct their spatial angles. Wherein the collimating wedge segments 37, 38, 39 and 310 are disposed between the Z-Block 30 and the lens array, and the collimated beams are coupled out through the lens array 31 to the fiber array 34.
The lens array 31 and the optical fiber array 34 of this embodiment are the same as those of embodiment 5.
The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.
Claims (10)
1. A small free space wavelength division multiplexer, characterized in that: it includes:
one side surface of the Z-Block is an optical signal transmission surface and is provided with a first transmission surface and a second transmission surface which are mutually spaced, the first transmission surface comprises a plurality of filters which are arranged side by side and have different working wavelengths, and the second transmission surface comprises an anti-reflection optical sheet;
the lens array is opposite to the first transmission surface and the second transmission surface of the Z-Block and is provided with lens units which correspond to the anti-reflection optical sheet and the plurality of filters one by one and are opposite to each other;
and the optical fiber array is opposite to the lens array and is provided with a plurality of sub optical fibers which correspond to the lens units of the lens array one by one.
2. A compact free-space wavelength division multiplexer according to claim 1, wherein: the lens array is a 1x5 lens array, the filter plates are correspondingly four, and the anti-reflection optical plate is one.
3. A compact free-space wavelength division multiplexer according to claim 2, wherein: the optical fiber array be 1x5 optical fiber array, it includes that one side has infrabasal plate, upper substrate and five transmission fiber in V type groove, the upper substrate fix the up end at the infrabasal plate, and a side of upper substrate is relative with the lens array, five transmission fiber connect side by side in the V type inslot of infrabasal plate and relative with the another side of upper substrate, wherein four of five transmission fiber correspond with four filters, the transmission fiber of the rest corresponds with anti-reflection optical sheet.
4. A compact free-space wavelength division multiplexer according to claim 1, wherein: the Z-Block, the lens array and the optical fiber array are fixed on a substrate oppositely.
5. A compact free-space wavelength division multiplexer according to claim 4, wherein: and a reflecting film is plated on the other side surface of the Z-Block.
6. A compact free-space wavelength division multiplexer according to claim 5, wherein: Z-Block and lens array between still be equipped with the school light wedge piece with a plurality of filters one-to-one, lens array and fiber array between still be equipped with wedge piece and gasket, lens array, wedge piece, gasket and fiber array as an organic whole according to preface fixed connection.
7. A compact free-space wavelength division multiplexer according to claim 6, wherein: the light correction wedge angle sheet is a cylindrical light correction wedge angle sheet or a square light correction wedge angle sheet.
8. A compact free-space wavelength division multiplexer according to any one of claims 5 to 7, wherein: the Z-Block comprises a parallel substrate, a plurality of filter plates and an anti-reflection glass plate, wherein the filter plates and the anti-reflection glass plate are attached to one side face of the parallel substrate, and a right-angle prism is fixed to the other side face of the parallel substrate through an inclined plane.
9. A compact free-space wavelength division multiplexer according to any one of claims 5 to 7, wherein: the Z-Block comprises a parallel substrate, a plurality of filter plates attached to one side surface of the flat substrate and a wedge-shaped anti-reflection glass plate.
10. A compact free-space wavelength division multiplexer according to any one of claims 5 to 7, wherein: the Z-Block comprises:
a pentagonal substrate having an inclined surface on one side thereof;
the filter plates are arranged on the side face of the pentagonal substrate, which is on the same side with the inclined plane at intervals;
and the parallel anti-reflection glass sheet is arranged on the inclined plane of the pentagonal substrate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010426224.4A CN113687472A (en) | 2020-05-19 | 2020-05-19 | Small free space wavelength division multiplexer |
| PCT/CN2020/094164 WO2021232494A1 (en) | 2020-05-19 | 2020-06-03 | Small free-space wavelength division multiplexer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010426224.4A CN113687472A (en) | 2020-05-19 | 2020-05-19 | Small free space wavelength division multiplexer |
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| CN113687472A true CN113687472A (en) | 2021-11-23 |
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| CN202010426224.4A Pending CN113687472A (en) | 2020-05-19 | 2020-05-19 | Small free space wavelength division multiplexer |
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| WO (1) | WO2021232494A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449495A (en) * | 2022-01-06 | 2023-07-18 | 波若威科技股份有限公司 | Optical device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645705A (en) * | 2011-02-21 | 2012-08-22 | 华为技术有限公司 | Wavelength division multiplexer (WDM), optical switch device and optical switch control method |
| CN203444138U (en) * | 2013-08-07 | 2014-02-19 | 上海光城邮电通信设备有限公司 | Filter-type wavelength division multiplexer |
| KR20160145956A (en) * | 2015-06-11 | 2016-12-21 | 주식회사 지피 | Wavelength multiplexing optical receiving module |
| CN110927882A (en) * | 2018-09-20 | 2020-03-27 | 福州高意通讯有限公司 | Small-sized wavelength division multiplexer |
| CN110927883A (en) * | 2018-09-20 | 2020-03-27 | 福州高意通讯有限公司 | Small-sized wavelength division multiplexer |
| CN111751931A (en) * | 2019-03-29 | 2020-10-09 | 福州高意通讯有限公司 | Small wavelength division multiplexer |
-
2020
- 2020-05-19 CN CN202010426224.4A patent/CN113687472A/en active Pending
- 2020-06-03 WO PCT/CN2020/094164 patent/WO2021232494A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449495A (en) * | 2022-01-06 | 2023-07-18 | 波若威科技股份有限公司 | Optical device |
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