CN109613654B - Multichannel parallel wavelength division multiplexing/demultiplexing light splitting component and optical device thereof - Google Patents
Multichannel parallel wavelength division multiplexing/demultiplexing light splitting component and optical device thereof Download PDFInfo
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- CN109613654B CN109613654B CN201811425900.5A CN201811425900A CN109613654B CN 109613654 B CN109613654 B CN 109613654B CN 201811425900 A CN201811425900 A CN 201811425900A CN 109613654 B CN109613654 B CN 109613654B
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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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—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
- G02B6/29346—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 operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
- G02B6/29362—Serial cascade of filters or filtering operations, e.g. for a large number of channels
- G02B6/29365—Serial cascade of filters or filtering operations, e.g. for a large number of channels in a multireflection configuration, i.e. beam following a zigzag path between filters or filtering operations
- G02B6/29367—Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4286—Optical modules with optical power monitoring
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0261—Optical medium access at the optical multiplex section layer
Abstract
The invention provides a multichannel parallel wavelength division multiplexing/demultiplexing light splitting component, which comprises a glass block, a prism and a filter set, wherein the filter set and the prism are attached to one side surface of the glass block, the filter set comprises a plurality of optical filters which are sequentially arranged, the adjacent two optical filters are attached to each other, the working surfaces of the optical filters are plated with film layers for reflecting or passing optical signals with corresponding wavelengths, the prism is provided with a first working surface, a second working surface and a third working surface, the included angle between the first working surface and the second working surface is equal to the central working angle alpha of the optical filters, the second working surface is parallel to the third working surface, and the third working surface is attached to the filter set. According to the invention, through the position of the optical filter and the design of the film layer on the optical filter, the optical signal of the channel corresponding to the optical filter is reflected, the optical signals of other channels are transmitted, and finally, the multi-channel optical signals are combined.
Description
Technical Field
The invention belongs to the technical field of optical devices and modules of optical communication, and particularly relates to a multichannel parallel wavelength division multiplexing/demultiplexing light splitting component and an optical device thereof, which can be applied to CWDM and LWDM wavelengths and can be packaged in QSFP28, QSFP DD, OSFP and other modules.
Background
High-speed optical devices with 100Gbps or above rate such as QSFP28 and PSM4 generally adopt 4-channel optical signals for parallel transmission and reception, and the mainstream of the optical path at the device level has two modes, one mode is device internal integration, namely, a wavelength division multiplexing/demultiplexing component is integrated inside the device, for example, a novel wavelength division multiplexing/demultiplexing optical component applied to high-speed parallel long-distance transmission disclosed by patent CN201210184192, and the other mode is module internal integration, namely, a large-size and tail fiber wavelength division multiplexer is adopted to integrate a separation device in a module, and the two process platforms have respective advantages and are both practical. At present, the following solutions are generally available for multi-wavelength multiplexing: the optical device comprises a waveguide type optical device, such as AWG (arrayed waveguide grating) and etched grating, a filter type optical filter, such as Z-shaped or W-shaped optical filter combination, a third polarization composite wave, such as PBS (polarization beam splitter), a reflector and a polarizer combination, wherein the waveguide type optical filter, the AWG and the etched grating are integrated in the optical device, and the waveguide type optical filter, the filter type optical filter, the third polarization composite wave, the polarized composite wave, the reflector and the polarizer combination are generally integrated in the optical device. For the waveguide type, the length of the AWG chip is at least 8mm, and the waveguide and the laser chip need to be coupled by a convergent lens, so that the overall length of the device is too long and the packaging requirement of the device is not met, and meanwhile, the temperature stability problem and the insertion loss problem of the AWG are not improved qualitatively all the time; for polarization wave combination, the PBS component has a very wide combination size, which can severely limit the width and length of the device, and the PBS in the existing polarization wave combination scheme must be used with a wave plate, so that the combined light beam is spatially combined but still has two polarization states perpendicular to each other in polarization, which is a way for the emission component, because an isolator must be placed, the isolator has an insertion loss of at least 3dB for the polarization states perpendicular to each other, and especially for long-distance transmission of an EML type laser, the 3dB insertion loss has a very large influence, which can cause insufficient output power; for the filter type, a zigzag filter set in the existing market, for example, in patent CN201210184192, there is a relationship between the nth channel filter in the filter set and the following N +1, N +2, etc. channels, and the mounting tolerance may be accumulated in the following channels, which causes the process tolerance of the final channel to be sensitive, for example, as shown in fig. 1(a) and fig. 1(b), the filter set of the 1 st channel has an angle θ due to the mounting tolerance, which causes the outgoing light of the 2 nd, 3 th and 4 th channels to have deviations of 2 θ, 4 θ and 6 θ, respectively, and there is a relatively significant lateral displacement. Therefore, such a structure requires very high parallelism of the glass substrate and the mounting of the filter element, which limits the assembly accuracy of the filter set.
Disclosure of Invention
The invention aims to solve the problems of large power loss and assembly tolerance of the existing filter type multi-wavelength multiplexing technology.
Therefore, the invention provides a multichannel parallel wavelength division multiplexing/demultiplexing light splitting component, which comprises a glass block, a prism and a filter set, the filter set and the prism are attached to one side surface of the glass block, the filter set comprises a plurality of filters, the plurality of optical filters are sequentially attached to the side surface of the glass block, and the adjacent two optical filters are attached to each other, the working surface of the optical filter is plated with a film layer for reflecting or passing through optical signals with corresponding wavelengths, the prism is provided with a first working surface for optical input/output, a second working surface for totally reflecting input light and a third working surface for optical output/input, the included angle between the first working surface and the second working surface is equal to the central working angle alpha of the optical filter, the second working face is parallel to the third working face, and the third working face is attached to the filter set.
Furthermore, the glass block is of a triangular structure and comprises a horizontal right-angle surface, a vertical right-angle surface and an inclined surface, the included angle between the inclined surface and the horizontal right-angle surface is 2 alpha, and an antireflection film is arranged on the vertical right-angle surface of the glass block; the filter set and the prism are attached to the inclined plane and are sequentially arranged from bottom to top along the inclined direction of the inclined plane.
Furthermore, the glass block, the prism and the filter set are made of the same glass material.
Furthermore, the optical filter is of a parallelogram prism structure, and the included angle of acute angles between adjacent planes of the optical filter is (90-alpha).
Further, the central working angle α of the optical filter is 8 °, 12 ° or 13.5 °.
Further, the film layer is a reverse film, a high-pass film or a low-pass film.
In addition, the invention also provides a light emitting device adopting the light splitting component, which comprises a first tube shell, and a first electrical interface and a first optical interface contact pin which are respectively arranged at two ends of the first tube shell, wherein a backlight detector chip set, a laser chip set, a collimating lens set, the light splitting component, an isolator and a first turning prism are sequentially arranged in the first tube shell, the backlight detector chip set is arranged at one end of the first electrical interface, the output end of the collimating lens set is connected with a glass block of the light splitting component, the output end of a prism of the light splitting component is connected with the isolator, and the output end of the first turning prism is connected with the first optical interface contact pin through a first collimating lens.
In one embodiment, a converging lens group is disposed between the laser chip group and the collimating lens group.
Further, the isolator is the magneto-optical isolator, and its inside magneto-optical crystal is 4 ~ 10 degrees angle slope settings.
The invention also provides a receiving optical device adopting the light splitting component, which comprises a second tube shell, and a second electrical interface and a second optical interface contact pin which are respectively arranged at two ends of the second tube shell, wherein a detector chip set, a collimating lens array, a reflector, the light splitting component and a second turning prism are arranged in the second tube shell, the detector chip set, the collimating lens array and the reflector are sequentially arranged at intervals from bottom to top, the detector chip set is connected with the second electrical interface, the input end of the reflector is connected with the glass block of the light splitting component, the input end of the prism of the light splitting component is connected with the second turning prism, and the input end of the second turning prism is connected with the second optical interface contact pin through a second collimating lens.
Compared with the prior art, the invention has the beneficial effects that:
(1) the multichannel parallel wavelength division multiplexing/demultiplexing light splitting component provided by the invention has the advantages that the position of the optical filter is set, the optical signals with the corresponding channel wavelength are reflected through the film layer on the optical filter, the optical signals with other channel wavelengths are transmitted, and finally, the multipath optical signals are combined.
(2) The transmitting optical device and the receiving optical device provided by the invention adopt the light splitting component with the multichannel parallel wavelength division multiplexing/demultiplexing function, the mounting precision of the optical filter is reduced, the assembly process is simple, the cost is greatly reduced, the optical signal coupling efficiency of each channel is high, and the defects of large volume, large loss, high packaging precision requirement, high cost and the like of the existing transmitting optical device and receiving optical device are overcome.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1(a) is a diagram of a conventional ideal optical filter type optical path;
fig. 1(b) is a diagram of a conventional optical path of a filter when the angle of the first channel filter θ is deviated;
FIG. 2 is a schematic structural view of a light-splitting module according to the present invention;
FIG. 3 is a schematic diagram of the prism structure of the light-splitting assembly of the present invention;
FIG. 4 is a schematic diagram showing optical path transmission of the light-emitting device in embodiment 2;
FIG. 5 is a schematic diagram showing optical path transmission of the light-emitting device in embodiment 3;
FIG. 6 is an enlarged schematic diagram of optical path transmission of section I of FIG. 5;
FIG. 7 is a top view of optical path transmission of the light-receiving device in embodiment 4;
fig. 8 is a side view of optical path transmission of the light receiving device in embodiment 4.
Description of reference numerals: 1. a glass block; 2. a prism; 3. a filter set; 4. a first electrical interface; 5. a laser chip set; 6. a collimating lens group; 7. a first case; 8. an isolator; 9. a first turning prism; 10. a first collimating lens; 11. a first optical port contact pin; 12. a backlight detector chipset; 13. a converging lens group; 14. a second collimating lens; 15. a second turning prism; 16. a second case; 17. a collimating lens array; 18. a mirror; 19. a detector chipset; 20. a second electrical interface; 21. a second optical port contact pin; 101. a horizontal right-angle surface; 102. a vertical right-angle surface; 103. a bevel; 201. a first working surface; 202. a second working surface; 203. a third working surface; 301. a first optical filter; 302. a second optical filter; 303. and a third optical filter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "plurality" or "a plurality" is two or more unless otherwise specified.
The following description is given by taking as an example a 4-channel optical device for CWDM (coarse wavelength division multiplexing system), where the operating wavelength is taken to be, but not limited to, the usual 4 wavelengths or combinations of CWDM:λ1、λ2、λ3、λ4such as 1271nm, 1291nm, 1311nm, 1331nm and the like.
Example 1:
as shown in fig. 2, the present embodiment provides a multichannel parallel wavelength division multiplexing/demultiplexing splitting assembly, which includes a glass block 1, a prism 2, and a filter set 3, and preferably, the glass block 1, the prism 2, and the filter set 3 are made of the same glass material to ensure that they have the same optical and thermal properties. The optical filter group 3 and the prism 2 are attached to one side face of the glass block 1, and the optical filter group 3 and the prism 2 are optimally bonded to the side face of the glass block 1 through refractive index matching glue; the optical filter set 3 includes a plurality of optical filters, the optical filters are sequentially attached to the side surface of the glass block 1, two adjacent optical filters are attached to each other, the two attached optical filters are filled with a refractive index matching adhesive, the working surface of each optical filter is plated with a film layer for reflecting or passing light signals of corresponding wavelengths, and specifically, the film layer of each optical filter may include a film with a reflection function for reflecting light signals of one channel and a high-pass film or a low-pass film for transmitting light signals of other channels. As shown in fig. 3, the prism 2 has a first working surface 201 for light input/output, a second working surface 202 for total reflection of input light, and a third working surface 203 for light output/input, and in order to ensure that an optical signal can smoothly pass through the first working surface 201 and the third working surface 203 and be totally reflected by the second working surface 202, it is preferable that an antireflection film is coated on both the first working surface 201 and the third working surface 203, and a total reflection film is coated on the second working surface 202. The included angle between the first working surface 201 and the second working surface 202 is equal to the central working angle α of the optical filter, and the range of α is not limited, and is preferably 8 °, 12 ° or 13.5 °; the second working surface 202 and the third working surface 203 are parallel, the third working surface 203 is attached to the filter set 3, and the middle of the third working surface 203 and the filter set 3 is filled with index matching glue.
Specifically, the glass block 1 is of a triangular structure and comprises a horizontal right-angle surface 101, a vertical right-angle surface 102 and an inclined surface 103, and an included angle between the inclined surface 103 and the horizontal right-angle surface 101 is 2 alpha; the filter set 3 and the prism 2 are attached to the inclined plane 103 and are sequentially arranged from bottom to top along the inclined direction of the inclined plane 103; according to the structure, the first working surface 201 of the prism 2 is parallel to the vertical right-angle surface 102 of the glass block 1 after being assembled, so that the optical signals transmitted into the filter are ensured to be transmitted in parallel along the direction of the inclined surface 103 of the glass block 1. And the optical signals of each channel are input/output through the vertical right-angle surface 102 of the glass block 1, and in order to improve the efficiency of inputting/outputting the optical signals of each channel into/from the glass block 1, an antireflection film is arranged on the vertical right-angle surface 102 of the glass block 1. The optical filter is of a parallelogram prism structure, and the acute included angle between adjacent planes of the optical filter is (90-alpha).
The multichannel parallel wavelength division multiplexing/demultiplexing light splitting component provided by the embodiment is simple to assemble, greatly reduces the assembly precision requirement on the optical filter and the power loss in the wave combining process, and avoids the influence of the inclination of the optical filter of a certain channel on other channels in the installation process of the existing optical filter set.
Example 2:
as shown in fig. 4, this embodiment provides a light emitting device using the multichannel parallel wavelength division multiplexing/demultiplexing light splitting component in embodiment 1, including a first tube shell 7, and a first electrical interface 4 and a first optical interface pin 11 respectively disposed at two ends of the first tube shell 7, where a backlight detector chip set 12, a laser chip set 5, a collimating lens set 6, a light splitting component, an isolator 8, and a first turning prism 9 are disposed in the first tube shell 7; the detector chip set 12 that is shaded sets up in 4 one ends of first electrical interface, the preceding light-emitting direction of laser chip set 5 is towards collimating lens group 6, and laser chip set 5 is located near the back focal plane of collimating lens group 6, collimating lens group 6 output with the vertical right angle face 102 of light splitting assembly's glass piece 1 links up, light splitting assembly's prism 2's output with isolator 8 links up, the output of first convertible prism 9 pass through first collimating lens 10 with first light mouthful contact pin 11 links to each other.
Wherein, isolator 8 can adopt monopole isolator or bipolar isolator according to specific parameter requirement, for the influence of avoiding isolator 8's surface reflection to the laser instrument chip, the preferred magneto-optical type isolator of isolator 8, inside magneto-optical crystal is 4 ~ 10 degrees (preferred 8 degrees) angle slope setting. The first turning prism 9 is of a parallelogram structure, preferably a 45-degree angle prism, the first turning prism 9 is used for turning the light path to a proper position and making the light path incident to the first collimating lens 10, the first collimating lens 10 is used for converging quasi-parallel light transmitted in the first tube shell 7 to the first optical interface pin 11, the first optical interface pin 11 can be a plug-in type optical interface or a tail fiber type optical interface, and the first optical interface pin 11 is preferably of a single-mode fiber type; the first collimating lens 10 can be disposed inside the first package 7, can be embedded on the wall of the first package 7, or can be disposed outside the first package 7; when the first collimating lens 10 is disposed outside the first package 7, the first collimating lens 10 and the first optical port 11 can be made into a collimator.
In addition, all the optical elements of the light emitting device can be arranged in the same plane, or the first optical ferrule 11 and the optical element in the first tube housing 7 can be formed with a dislocation in height, and then the first turning prism 9 can be used to perform three-dimensional turning.
In this embodiment, the working wavelengths of the four channels are λ1、λ2、λ3And λ4For example, the optical path transmission process of the light emitting device of the present embodiment is specifically described, wherein the optical filter set 3 in the light splitting assembly includes three optical filters, which are a first optical filter 301, a second optical filter 302, and a third optical filter 303 from bottom to top along the inclined plane 103 of the glass block 1, and the working surface of the first optical filter 301 is plated with a coating such that λ is4The working surface of the reflective film layer and the second optical filter 302 is plated with a layer of lambda4Transmission, lambda3The working surface of the reflective film layer and the filter layer III 303 is plated with lambda4、λ3Transmission, lambda2Reflecting film, the third working surface 203 of the prism 2 being coated with a coating of lambda4、λ3、λ2Transmission, lambda1A reflective film layer. Backlight detectorThe chip set 12 includes a chip pair λ1、λ2、λ3、λ4And the four backlight detector chips correspond to the four channels one by one. The laser chip set 5 comprises a chip group and a chip group1、λ2、λ3、λ4And four laser chips corresponding to the four channels one by one. The collimating lens group 6 likewise comprises1、λ2、λ3、λ4And four collimating lenses corresponding to the four channels one by one.
λ1The light waves are transmitted to corresponding collimating lenses in a divergent mode after being excited by the corresponding laser chips, the light waves are collimated into quasi-parallel light by the collimating lenses, the quasi-parallel light is incident to the vertical right-angle surface 102 of the glass block 1 in a vertical or approximately vertical mode, then the quasi-parallel light passes through the glass body of the glass block 1 and reaches the inclined surface 103 of the glass block 1 and then enters the prism 2, the quasi-parallel light can directly enter the prism 2 without refraction and reaches the third working surface 203 of the prism 2 due to the fact that the prism 3 and the glass block 1 are made of the same material, and the third working surface 203 is coated with a film layer to enable lambda to be generated by the fact that the1Is reflected at an angle of 2 a and directed towards the second working surface 202 of the prism 2, then reaches the second working surface 202 of the prism 2 for total reflection, and then exits from the first working surface 201 of the prism 2.
λ2The light waves are transmitted to corresponding collimating lenses in a divergent mode after being excited by the corresponding laser chips, the light waves are collimated into quasi-parallel light by the collimating lenses, the quasi-parallel light is incident to the vertical right-angle surface 102 of the glass block 1 in a vertical or approximately vertical mode, then the quasi-parallel light passes through the glass entity of the glass block 1 and enters the optical filter III 303 after reaching the inclined surface 103 of the glass block 1, the quasi-parallel light can directly enter the optical filter III 303 without refraction and reach the working surface of the optical filter III 303 due to the fact that the optical filter III 303 and the glass block 1 are made of the same material, and the working surface of the optical filter III 303 is plated with a film layer to enable lambda to2Is reflected at an angle of 2 alpha towards the prism 2, passes through the filter three 303 and reaches the third working surface 203 of the prism 2, due to the film pair lambda of the third working surface 2032Is transmissive, λ2Through the third working surface 203, then into the prism 2 and to the second working surface 202 of the prism 2 for total reflection, and then fromThe first working surface 201 of the prism 2 exits.
λ3The light waves are transmitted to the corresponding collimating lens in a divergent mode after being excited by the corresponding laser chip, the light waves are collimated into quasi-parallel light by the collimating lens, the quasi-parallel light is incident to the vertical right-angle surface 102 of the glass block 1 in a vertical or approximately vertical mode, and then the quasi-parallel light passes through the glass body of the glass block 1 to reach the inclined surface 103 of the glass block 1 and then enters the second optical filter 302; the second optical filter 302 and the glass block 1 are made of the same material, so that quasi-parallel light can directly enter the second optical filter 302 without refraction and reach the working surface of the second optical filter 302, and the working surface of the second optical filter 302 is coated with a film layer to ensure that lambda is enabled3Is reflected at an angle of 2 alpha, faces to the direction of the filter three 303, passes through the filter three 303 and reaches the working surface of the filter three 303, and the film layer pair lambda of the working surface of the filter three 3033Is transmissive, λ3Passes through the working surface of filter three 303, enters filter three 303, and then lambda3Passes through the filter three 303 and reaches the third working surface 203 of the prism 2, then enters the prism 2 and reaches the second working surface 202 of the prism 2 for total reflection, and then exits from the first working surface 201 of the prism 2.
λ4The light waves are transmitted to corresponding collimating lenses in a divergent mode after being excited by the corresponding laser chips, the light waves are collimated into quasi-parallel light by the collimating lenses, the quasi-parallel light is incident on a vertical right-angle surface 102 of the glass block 1 in a vertical or approximately vertical mode, and then the quasi-parallel light passes through a glass body of the glass block 1 to reach an inclined surface 103 of the glass block 1 and then enters a first optical filter 301; because the first optical filter 301 and the glass block 1 are made of the same material, quasi-parallel light can directly enter the first optical filter 301 without refraction and reach the working surface of the first optical filter 301, and the working surface of the first optical filter 301 is coated with a film layer to ensure that lambda is enabled4The light is reflected at an angle of 2 alpha, and is directed towards the second filter 302, passes through the first filter 301 and reaches the working surface of the second filter 302, and because the film layer pair lambda of the working surface of the second filter 3024Is transmissive, λ4Passes through the working surface of the second filter 302, enters the second filter 302, and then reaches the working surface of the third filter 303, because of the film layer pair lambda of the working surface of the third filter 3034Is transmissive, λ4Passes through the working surface of the filter three 303, enters the filter three 303 and then reaches the third working surface 203 of the prism 2 due to the film layer pair lambda of the third working surface 2034Is transmissive, λ4Passes through the third working surface 203, then enters the prism 2 and reaches the second working surface 202 of the prism 2 for total reflection, and then exits from the first working surface 201 of the prism 2.
The light waves of the four channels are emitted from the first working surface 201 of the prism 2, at this time, the four channels are subjected to wave combination in space, the wave combination is converted into a light wave, the light beam of the wave combination is continuously transmitted to the isolator 8, the light passing direction of the isolator 8 allows the four light waves to pass through, the light wave passes through the isolator 8 and then reaches the first turning prism 9, the light wave is then turned by the first turning prism 9 in a translation manner, the light wave then reaches the first collimating lens 10, and the light wave is converged to the first optical port contact pin 11 by the first collimating lens 10. The reason why the first collimating lens 10 is referred to herein as a collimating lens rather than a converging lens is that the quasi-parallel light in the first housing 7 is converged, but the light inputted in the opposite direction to the first optical port 11 is collimated.
Example 3:
as shown in fig. 5 and fig. 6, the structure of the light emitting device of the present embodiment is substantially the same as that of embodiment 2, except that a converging lens group 13 is further disposed between the laser chip group 5 and the collimating lens group 6, and the other structures are the same as those of example 2 and will not be repeated here. Structurally, the laser chip set 5 is arranged at a proper object distance of the converging lens group 13, the converging lens group 13 is used for converging diverging light beams excited by the laser chip set 5 into an image point, and a back focus of the collimating lens group 6 is superposed with the image point. Lambda [ alpha ]1The light waves are transmitted to the corresponding converging lens in a divergent mode after being excited by the corresponding laser chip, the light waves are converged into an image point by the converging lens, the image point is continuously transmitted to the corresponding collimating lens, the image point is collimated into quasi-parallel light by the collimating lens due to the coincidence of the image point and the back focal point of the collimating lens, the quasi-parallel light is continuously transmitted to the vertical right-angle surface 102 of the glass block 1, the transmission of the light path is the same as that of the example 2 and is not repeated, and other three paths of lambda are the same as that of the lambda of the other three paths2、λ3、λ4Of (2) a lightRoad transmission process and lambda1Similarly, they will not be repeated.
Example 4:
as shown in fig. 7 and fig. 8, this embodiment provides a receiving optical device using the multichannel parallel wavelength division multiplexing/demultiplexing splitter in embodiment 1, including a second package 16, and a second electrical interface 20 and a second optical interface pin 21 respectively disposed at two ends of the second package 16, a detector chipset 19, a collimating lens array 17, a reflecting mirror 18, a splitter and a second turning prism 15 are disposed in the second package 16, the detector chipset 19, the collimating lens array 17 and the reflecting mirror 18 are sequentially stacked from bottom to top, the detector chipset 19 is connected to the second electrical interface 20, a photosensitive surface of the detector chipset 19 is located at a back focal plane of the collimating lens array 17, an input end of the reflecting mirror 18 is connected to a vertical right-angle surface 102 of a glass block 1 of the splitter, an input end of a prism 2 of the splitter is connected to the second turning prism 15, the input end of the second turning prism 15 is connected with the second optical port pin 21 through a second collimating lens 14.
Wherein the second turning prism 15 has a parallelogram structure, preferably a 45-degree angle prism, and the second turning prism 15 is used for turning the optical path to a proper position. The second collimating lens 14 is used for collimating the light input from the second optical port 21 into quasi-parallel light. The second optical interface insertion pin 21 may be a plug-in type optical interface or a pigtail type optical interface, and the second optical interface insertion pin 21 is preferably a single-mode optical fiber type. The second collimating lens 14 can be disposed inside the second package 16, can be embedded on the wall of the second package 16, or can be disposed outside the second package 16; when the second collimating lens 14 is disposed outside the second package 16, the second collimating lens 14 and the second optical port 21 can be made into a collimator.
In this embodiment, the working wavelengths of the four channels are λ1、λ2、λ3And λ4For example, the optical path transmission process of the receiving optical device in this embodiment is specifically described, wherein the optical filter set 3 in the optical splitting assembly includes three optical filters, and the optical filters one 30 are respectively arranged along the inclined plane 103 of the glass block 1 from bottom to top in sequence1. The working surface of the first filter 301 is plated with lambda4The working surface of the reflective film layer and the second optical filter 302 is plated with a layer of lambda4Transmission, lambda3The working surfaces of the reflective film layer and the filter III 303 are plated with a layer of lambda4、λ3Transmission, lambda2Reflecting film, the third working surface 203 of the prism 2 being coated with a coating of lambda4、λ3、λ2Transmission, lambda1A reflective film layer. The detector chip set 19 includes a chip pair λ1、λ2、λ3、λ4And the four backlight detector chips correspond to the four channels one by one. The collimator lens array 17 likewise comprises1、λ2、λ3、λ4And four collimating lenses corresponding to the four channels one by one. The reflector 18 includes a1、λ2、λ3、λ4And the four channels correspond to the four reflector plates one by one.
The four optical signals are input from the second optical port pin 21, reach the second collimating lens 14, are collimated into quasi-parallel light, and are transmitted, and then reach the second turning prism 15, the second turning prism 15 turns the optical path to a proper distance in a translation manner, and then output from the second turning prism 15, and then reach the first working surface 201 of the prism 2, then enter the prism 2, reach the second working surface 202 of the prism 2 for total reflection, and then are reflected at an angle of 2 α, and the reflection direction faces the filter set 3.
λ1The light wave is reflected by the second working surface 202 of the prism 2 and reaches the third working surface 203, because the coating layer of the third working surface 203 is opposite to lambda1Reflection, hence λ1Reflecting at an angle of 2 alpha, then entering the glass block 1, reaching the vertical right-angle surface 102 of the glass block 1, penetrating the vertical right-angle surface 102 of the glass block 1 and reaching the angle lambda1The reflector for light wave has an angle of 40-50 deg., preferably 45 deg., so that λ1The light waves are reflected perpendicularly towards the collimating lens array 17, the collimating lens array 17 can be a silicon lens or a glass lens, the collimating lens array 17 converges the light waves into an imaging point, the imaging point is received by the detector chip set 19, and the light waves are converted into current through the photoelectric effect and output by the second electrical interface 20.
λ2The light wave is reflected by the second working surface 202 of the prism 2 and reaches the third working surface 203, because the coating layer of the third working surface 203 is opposite to lambda2Transmitting, then the light wave enters the filter three 303 and then reaches the working surface of the filter three 303, because the coating layer pair lambda of the working surface of the filter three 3032Reflection, hence λ2Reflecting at an angle of 2 alpha, then entering glass block 1, then reaching vertical right-angle surface 102 of glass block 1, and then penetrating vertical right-angle surface 102 of glass block 1 to reach the angle lambda2The reflector corresponding to the light wave is reflected perpendicularly toward the collimating lens array 17, the collimating lens array 17 may be a silicon lens or a glass lens, the collimating lens array 17 receives the light wave converging imaging point by the detector chip set 19, and the light wave converging imaging point is converted into a current by the photoelectric effect and output by the second electrical interface 20.
λ3The light wave is reflected by the second working surface 202 of the prism 2 and reaches the third working surface 203, because the coating layer of the third working surface 203 is opposite to lambda2Transmitting, then the light wave enters the filter three 303 and then reaches the working surface of the filter three 303, because the coating layer pair lambda of the working surface of the filter three 3033Transmitting, then the light wave enters the second optical filter 302 and then reaches the working surface of the second optical filter 302, because the coating layer pair lambda is coated on the working surface of the second optical filter 3023Reflection, hence λ3Reflecting at an angle of 2 alpha, then entering the glass block 1, reaching the vertical right-angle surface 102 of the glass block 1, penetrating the vertical right-angle surface 102 of the glass block 1 and reaching the angle lambda3The reflector corresponding to the light wave is reflected perpendicularly toward the collimating lens array 17, the collimating lens array 17 may be a silicon lens or a glass lens, the collimating lens array 17 receives the light wave converging imaging point by the detector chip set 19, and the light wave converging imaging point is converted into a current by the photoelectric effect and output by the second electrical interface 20.
λ4The light wave is reflected by the second working surface 202 of the prism 2 and reaches the third working surface 203, because the coating layer of the third working surface 203 is opposite to lambda2Transmitting, then the light wave enters the filter three 303 and then reaches the working surface of the filter three 303, because the coating layer pair lambda of the working surface of the filter three 3034Transmitting, then the light wave enters the second filter 302, and then reachesThe working surface of the second optical filter 302 is reached, and the coating layer pair lambda of the working surface of the second optical filter 3024Transmitting, then the light wave enters the first optical filter 301 and then reaches the working surface of the first optical filter 301, and the coating layer pair lambda is coated on the working surface of the first optical filter 3014Reflection, hence λ4Reflecting at an angle of 2 alpha, then entering the glass block 1, reaching the vertical right-angle surface 102 of the glass block 1, penetrating the vertical right-angle surface 102 of the glass block 1 and reaching the angle lambda4The reflector corresponding to the light wave is reflected perpendicularly toward the collimating lens array 17, the collimating lens array 17 may be a silicon lens or a glass lens, the collimating lens array 17 receives the light wave converging imaging point by the detector chip set 19, and the light wave converging imaging point is converted into a current by the photoelectric effect and output by the second electrical interface 20.
The emitting optical device and the receiving optical device provided by the embodiment adopt the light splitting component with the multichannel parallel wavelength division multiplexing/demultiplexing function, so that the mounting precision of the optical filter is reduced, the assembly process is simple, the cost is greatly reduced, the optical signal coupling efficiency of each channel is high, and the defects of large volume, large loss, high packaging precision requirement, high cost and the like of the existing emitting optical device and receiving optical device are overcome.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. The multichannel parallel wavelength division multiplexing/demultiplexing light splitting component is characterized in that: the optical filter group and the prism are attached to one side face of the glass block, the optical filter group comprises a plurality of optical filters, the optical filters are sequentially attached to the side face of the glass block, two adjacent optical filters are attached to each other, the working faces of the optical filters are plated with film layers for reflecting or passing through corresponding wavelength optical signals, the prism is provided with a first working face for optical input/output, a second working face for totally reflecting input light and a third working face for optical output/input, an included angle between the first working face and the second working face is equal to a central working angle alpha of the optical filters, the second working face and the third working face are parallel, and the third working face is attached to the optical filter group;
the glass block is of a triangular structure and comprises a horizontal right-angle surface, a vertical right-angle surface and an inclined surface, the included angle between the inclined surface and the horizontal right-angle surface is 2 alpha, and an antireflection film is arranged on the vertical right-angle surface of the glass block; the optical filter set and the prism are attached to the inclined plane and are sequentially arranged along the inclined direction of the inclined plane from bottom to top; the glass block, the prism and the filter set are made of the same glass material.
2. The multi-channel parallel wavelength division multiplexing/demultiplexing optical division component of claim 1, wherein: the optical filter is of a parallelogram prism structure, and the acute included angle between adjacent planes of the optical filter is (90-alpha).
3. The multi-channel parallel wavelength division multiplexing/demultiplexing optical division component of claim 2, wherein: the central working angle alpha of the optical filter is 8 degrees, 12 degrees or 13.5 degrees.
4. The multi-channel parallel wavelength division multiplexing/demultiplexing optical division component of claim 1, wherein: the film layer is a reverse film, a high-pass film or a low-pass film.
5. A light-emitting device using the light-splitting module as claimed in any one of claims 1 to 4, wherein: the optical fiber coupling device comprises a first tube shell, a first electrical interface and a first optical interface contact pin, wherein the first electrical interface and the first optical interface contact pin are respectively arranged at two ends of the first tube shell, a backlight detector chip set, a laser chip set, a collimating lens set, a light splitting assembly, an isolator and a first turning prism are sequentially arranged in the first tube shell, the backlight detector chip set is arranged at one end of the first electrical interface, the output end of the collimating lens set is connected with a glass block of the light splitting assembly, the output end of the prism of the light splitting assembly is connected with the isolator, and the output end of the first turning prism is connected with the first optical interface contact pin through the first collimating lens.
6. The light emitting device of claim 5, wherein: and a converging lens group is arranged between the laser chip group and the collimating lens group.
7. The light emitting device of claim 5, wherein: the isolator is the magneto-optical type isolator, and its inside magneto-optical crystal is 4 ~ 10 degrees angle slope settings.
8. A light-receiving device using the optical splitting module according to any one of claims 1 to 4, wherein: the detector chip set, the collimating lens array, the reflecting mirror, the light splitting assembly and the second turning prism are arranged in the second tube shell at intervals from bottom to top, the detector chip set is connected with the second electrical interface, the input end of the reflecting mirror is connected with the glass block of the light splitting assembly, the input end of the prism of the light splitting assembly is connected with the second turning prism, and the input end of the second turning prism is connected with the second light interface contact pin through the second collimating lens.
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| CN111308619B (en) * | 2020-01-20 | 2022-04-15 | 武汉联特科技股份有限公司 | Light emitting device and coupling method thereof |
| CN113726470B (en) * | 2020-05-20 | 2022-11-25 | 清华大学天津电子信息研究院 | Mobile forward-transmission method and system based on LWDM technology |
| CN112213823A (en) * | 2020-10-29 | 2021-01-12 | 苏州伽蓝致远电子科技股份有限公司 | Optical integrated assembly |
| CN217879736U (en) * | 2022-06-21 | 2022-11-22 | 成都旭创科技有限公司 | Optical transceiver module |
| CN116155383A (en) * | 2023-01-13 | 2023-05-23 | 讯芸电子科技(中山)有限公司 | Single-fiber multi-task transmission system |
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