CN213715621U - Narrow-band adjustable filter - Google Patents
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- CN213715621U CN213715621U CN202022210666.3U CN202022210666U CN213715621U CN 213715621 U CN213715621 U CN 213715621U CN 202022210666 U CN202022210666 U CN 202022210666U CN 213715621 U CN213715621 U CN 213715621U
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Abstract
The utility model relates to the field of filters, in particular to a narrow-band tunable filter, which comprises a light input component, a light splitting component, a first optical component for changing the light transmission direction, a light beam deformation component, a polarization state adjusting component for adjusting the light polarization state, a thin film filter, a reflector, a light combining component and a light output component; compared with the prior art, the utility model discloses a design a narrow band tunable filter, make the light path return on the film filtering piece original way through the polarization state that changes the light, effectively prevented because the bandwidth that the film thickness of film filtering piece is inhomogeneous causes increases, also reduced the coating film requirement of film filtering piece simultaneously, furtherly, through setting up light input subassembly and light output subassembly for incident light and emergent light transmit in different transmission subassemblies, effectively reduced the light energy loss.
Description
Technical Field
The utility model relates to a wave filter field, concretely relates to narrow band adjustable filter.
Background
In modern smart optical communication networks, a Tunable Optical Filter (TOF) is an indispensable device, and functionally, a tunable optical filter is a wavelength (frequency) selection device capable of selecting an optical signal of a specific wavelength (frequency) from input optical signals of many different frequencies according to needs.
With the continuous development of science and technology, the spacing of optical channels in a DWDM (dense wavelength division multiplexing) system is continuously reduced, the number of channels is continuously increased, and a tunable optical filter with small insertion loss, wide adjustment range, narrow bandwidth, high isolation, high stability, low cost and compact structure is urgently needed; however, among the commonly used tunable optical filters at present, there are mainly a filter based on the fiber bragg grating principle, a filter based on a normal-porro etalon, a mach-zehnder interferometer, a ring resonator of a planar optical waveguide loop, an acousto-optic tuning filter, etc., which all belong to passive tunable filters, generally have fixed bandwidth and spectrum transmission shape, have certain limitations on the flexible adjustment of wavelength and bandwidth, and cannot meet the requirements of DWDM systems with small optical channel spacing, so that the flexible adjustable tunable optical filter based on the thin film optical filter technology is generally adopted in the DWDM systems.
In the prior art, a tunable filter based on a thin film filter usually uses a mode that an optical input and an optical output share the same channel, and since the input light and the output light are transmitted through the same optical transmission component, a large light energy loss is generated; at present, the adjustable filter with different channels for light input and light output is adopted, but the adjustable filter is used for reflecting two beams of light after spectral filtering through a triangular prism and then re-entering the thin film filter, and finally outputting the light through the light output channel.
Therefore, it is important to design a narrow-band tunable filter suitable for DWDM systems with low optical loss.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a narrow band tunable filter suitable for DWDM system and optical loss are little, overcome prior art the big and easy defect that causes the optical bandwidth to increase of light energy loss.
The utility model provides a technical scheme that its technical problem adopted is: the invention provides a narrow-band tunable filter, which is preferably characterized in that: the narrow-band tunable filter comprises an optical input component, a light splitting component, a first optical component for changing the light transmission direction, a light beam deformation component, a polarization state adjusting component for adjusting the light polarization state, a thin film filter, a reflector, a light combining component and an optical output component;
the light source comprises a light input assembly, a light splitting assembly, a light beam deformation assembly, a light polarization state adjusting assembly, a light path adjusting assembly, a light combining assembly and a light output assembly, wherein incident light enters the light splitting assembly through the light input assembly to be split into two beams of first polarized light, the two beams of first polarized light enter the light beam deformation assembly after passing through the first optical assembly, the light beam deformation assembly changes the shape of a light spot of the first polarized light, then the light beam deformation assembly enters the light polarization state adjusting assembly and outputs two beams of second polarized light perpendicular to the polarization direction of the first polarized light, the two beams of second polarized light are filtered by the thin film filter and then irradiate to the reflector, the second polarized light is reflected by the reflector and returns to the thin film filter through the original path, then the second polarized light enters the light state adjusting assembly after the light beam.
Wherein, the preferred scheme is as follows: the beam deformation component is two right-angle prisms arranged in pairs.
Wherein, the preferred scheme is as follows: the light beam deformation component is a cylindrical mirror.
Wherein, the preferred scheme is as follows: the light splitting assembly comprises a light splitting piece and a first glass slide arranged on the light splitting piece, incident light is split into first polarized light and second polarized light with mutually vertical polarization angles through the light splitting piece, and the second polarized light is emitted into the first glass slide and then outputs the first polarized light to output two beams of the first polarized light.
Wherein, the preferred scheme is as follows: the light combination component comprises a light combination piece and a second glass slide arranged on the light combination piece, wherein one beam of second polarized light emitted by the first optical component outputs first polarized light after passing through the second glass slide, and the first polarized light and the other beam of second polarized light are emitted into the light combination piece together and form elliptically polarized light to be output.
Wherein, the preferred scheme is as follows: the first glass slide is a half glass slide, the optical axis direction of the first glass slide is 45 degrees, the second glass slide is a half glass slide, and the optical axis direction of the second glass slide is 45 degrees.
Wherein, the preferred scheme is as follows: the first optical assembly is a PSB (power system bus) piece with a coated film, the first polarized light is P polarized light, the second polarized light is S polarized light, two beams of input P polarized light are emitted into the polarization state adjusting assembly after passing through the PBS piece and output two beams of S polarized light, the two beams of S polarized light are emitted to the reflecting mirror after being filtered by the thin film filter, then are reflected by the reflecting mirror and return to the thin film filter in the original path and then are emitted into the polarization state adjusting assembly, then are emitted into the light combining assembly after the transmission direction of the light path of the PBS piece is changed to combine light, and form elliptical polarized light after being combined and output by the light output assembly.
Wherein, the preferred scheme is as follows: the polarization state adjusting assembly comprises a 45-degree Faraday rotator and a third glass slide with the optical axis direction of 22.5 degrees, two beams of incident first polarized light rotate 45 degrees through the 45-degree Faraday rotator, and then rotate 45 degrees again through the third glass slide so as to output two beams of second polarized light, and two beams of emergent second polarized light rotate 45 degrees through the third glass slide and then rotate 45 degrees through the 45-degree Faraday rotator so as to output two beams of second polarized light.
Wherein, the preferred scheme is as follows: the light input assembly comprises an input end for light input and a first collimating mirror for light collimation, and the light output assembly comprises an output end for light output and a second collimating mirror for light collimation.
Wherein, the preferred scheme is as follows: the curvature radius of the first collimating mirror is the same as that of the second collimating mirror.
The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses a design a narrowband tunable filter, make the light path return on the film filtering piece original route through the polarization state that changes the light, effectively prevented because the inhomogeneous bandwidth that causes of film thickness of film filtering piece increases, also reduced film filtering piece's coating film requirement simultaneously, furtherly, through setting up light input subassembly and light output subassembly for incident light and emergent light transmit in different transmission subassemblies, effectively reduced the light energy loss.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a first schematic structural diagram of a narrow-band tunable filter in the present invention;
fig. 2 is a schematic structural diagram of the light splitting assembly and the light combining assembly in the present invention;
fig. 3 is a schematic structural diagram of a first optical assembly according to the present invention;
fig. 4 is a schematic structural diagram of a polarization state adjustment assembly in the present invention;
fig. 5 is a schematic structural diagram of a narrow-band tunable filter according to the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a preferred embodiment of a narrow-band tunable filter.
A narrow-band tunable filter, referring to fig. 1, includes an optical input assembly 10, a light splitting assembly 20, a first optical assembly 30 for changing the polarization state of light, a beam deforming assembly 90, a polarization state adjusting assembly 40 for adjusting the polarization state of light, a thin film filter 50, a mirror 60, a light combining assembly 70, and an optical output assembly 80;
the incident light enters the light splitting assembly 20 through the light input assembly 10 to be split into two beams of first polarized light, the two beams of first polarized light enter the light beam deforming assembly 90 after passing through the first optical assembly 30, the two beams of first polarized light enter the polarization state adjusting assembly 40 after changing the spot shape through the light beam deforming assembly 90 and output two beams of second polarized light perpendicular to the polarization direction of the first polarized light, the two beams of second polarized light irradiate the reflector 60 after being filtered by the thin film filter 50, then are reflected by the reflector 60 and return to the thin film filter 50 through the original path and then enter the polarization state adjusting assembly 40, then the two beams of second polarized light reduce the spot shape through the light beam deforming assembly and then irradiate the first optical assembly 30, then the two beams of second polarized light enter the light combining assembly 70 after changing the light path transmission direction through the first optical assembly 30 and are combined to form elliptically polarized light and are output through the light output assembly 80.
Specifically, an incident light transmission channel and an emergent light transmission channel are separated by arranging a light input assembly and a light output assembly so as to reduce energy loss in the light transmission process, further, light splitting and light combining are carried out through a light splitting assembly and a light combining assembly, the polarization states of two split input lights are the same, namely two first polarized lights are output, the two output lights with the same polarization states are combined into elliptical polarized light, namely two second polarized lights are combined into elliptical polarized light, so as to ensure the polarization states of the lights; furthermore, the light path positions of the emergent light and the incident light are different through the first optical assembly, so that the emergent light is ensured to normally enter the light output assembly, and the light loss caused by the light original path returning to the light input assembly is prevented; furthermore, through the cooperation of the first optical assembly and the polarization state adjusting assembly, the path positions of the two beams of output light and the two beams of input light on the thin film filter are consistent, so that light spots appear on the thin film filter at only two positions, the bandwidth increase caused by the uneven coating thickness of the thin film filter can be effectively reduced, and the bandwidth increase caused by the uneven coating thickness of the thin film filter can be even avoided.
Further, in the present embodiment, two schemes of the beam-deforming unit are provided.
Scheme one
The light beam deformation component is a prism which is arranged in pairs, specifically can be a 30-degree right-angle prism pair, and can also be a 45-degree right-angle prism pair, the incident light enters the light splitting assembly 20 through the light input assembly 10 to be split into two beams of first polarized light, the two beams of first polarized light are transmitted to the right-angle prism pair 90 through the first optical assembly 30, the two beams of first polarized light are transmitted into the polarization state adjusting assembly 40 after the spot shape of the two beams of first polarized light is changed through the right-angle prism pair 90 and then output to two beams of second polarized light perpendicular to the polarization direction of the first polarized light, the two beams of second polarized light are filtered through the thin film filter 50 and then emitted to the reflector 60, then reflected through the reflector 60 and returned to the right-angle prism pair 90 in the original path, the two beams of second polarized light are emitted into the first optical assembly 30 after the spot shape of the two beams of second polarized light is restored through the right-angle prism pair 90, the two beams of second polarized light are emitted into the light combining assembly 70 after the light path position.
Scheme two
The light beam deformation component is a cylindrical mirror; the incident light enters the light splitting assembly 20 through the light input assembly 10 to split the light into two beams of first polarized light, the two beams of first polarized light are transmitted to the cylindrical mirror 90 through the first optical assembly 30, the two beams of first polarized light are incident to the polarization state adjusting assembly 40 after the spot shape of the incident light is changed through the cylindrical mirror 90 and output two beams of second polarized light perpendicular to the polarization direction of the first polarized light, the two beams of second polarized light are filtered by the thin film filter 50 and then emitted to the reflecting mirror 60, then reflected by the reflecting mirror 60 and returned to the cylindrical mirror 90 in the original path, the spot shape of the second polarized light is restored through the cylindrical mirror 90 and then emitted to the first optical assembly 30, the light path position of the second polarized light is changed through the first optical assembly 30 and then emitted to the light combining assembly 70 to be combined, and the combined light forms elliptically polarized light and is.
Further, referring to fig. 2, the light splitting assembly includes a light splitting element 21 and a first glass slide 22 disposed on the light splitting element 21, the incident light is split into a first polarized light beam and a second polarized light beam by the light splitting element 21, wherein the second polarized light beam is incident on the first glass slide 22 and then outputs the first polarized light beam to output two first polarized light beams; the light combining component comprises a light combining piece 71 and a second glass sheet 72 arranged on the light combining piece 71, one beam of emergent second polarized light outputs first polarized light after passing through the second glass sheet 72, and the first polarized light and the other beam of second polarized light are incident into the light combining piece 71 together, and the combined light forms elliptically polarized light and is output.
The present embodiment provides two schemes of the optical splitting assembly and the optical combining assembly.
Scheme one
The light splitting component and the light combining component are birefringent crystals, when one light wave is projected onto a crystal interface, two refracted light beams are generally generated, and the phenomenon is called birefringence; because of the anisotropy of the crystal material, the size of the included angle between the two refracted light beams depends on the propagation direction and the polarization state of the light wave, and the crystal generating the birefringence phenomenon is called a birefringent crystal.
Scheme two
The light splitting component and the light combining component are polarization splitting prisms, namely PBS components with coating films, the polarization splitting prisms are composed of two coating films with an angle of 45 degrees with the horizontal direction and can divide incident unpolarized light into two beams of linearly polarized light (P polarized light and S polarized light) with vertical polarization directions; the P polarized light passes through the film completely, the S polarized light is reflected twice by the film coating surface at an angle of 45 degrees, and the final emergent direction is parallel to the P polarized light but the polarization directions are mutually vertical.
The optical axis directions of the first glass slide and the second glass slide are both 45 degrees, the incident light is split into first polarized light and second polarized light by the light splitting element, the second polarized light is transmitted into the first glass slide and then rotated by 90 degrees, namely, the polarization state is changed to form the first polarized light, so that the light splitting part splits the incident light into two beams of the first polarized light, two beams of emergent light returned after filtering are both the second polarized light, one beam of the second polarized light is transmitted into the second glass slide and then rotated by 90 degrees, namely, the polarization state changes the stroke of the first polarized light, and then the first polarized light and the second polarized light are combined into elliptical polarized light through the light combining element.
Further, referring to fig. 3, the first optical component 30 is a PBS component with a coated film, and specifically includes a first coated surface 31 and a second coated surface 32, in this embodiment, the first polarized light is P polarized light, the second polarized light is S polarized light, two input P polarized lights are directly transmitted to the beam deformation component after being incident on the first optical component 30, and two output S polarized lights are reflected to the second coated surface 32 through the first coated surface 31 after being incident on the first optical component, and then reflected to the light combination component 70 by the second coated surface 32 again, so as to combine the lights into an elliptically polarized light for output.
Specifically, the PBS is also called a polarization splitting prism, and the polarization splitting prism can split incident unpolarized light into two vertical linearly polarized lights; in this embodiment, the PBS includes two PBS lenses disposed opposite to each other, two output beams of S polarized light are incident on the first PBS mirror 31, then incident on the second PBS mirror 32 in a direction 90 degrees from the incident light direction, and are reflected again by the second PBS mirror 32 in a direction 90 degrees from the incident light direction, and then are emitted in a direction 180 degrees from the incident light direction.
In this embodiment, the first optical component that can make the P polarized light transmit, and the S polarized light reflect can make two bundles of incident light and two bundles of emergent light' S light path position different to guarantee that the emergent light is accurate to be penetrated into and to close optical assembly and optical output assembly, in order to accomplish and close light and output.
Further, referring to fig. 4, the polarization state adjustment assembly 40 includes a 45 ° faraday rotator 41 and a third glass slide 42 with an optical axis direction of 22.5 °, the two incident beams of first polarized light are rotated by 45 ° through the 45 ° faraday rotator 41, and then rotated again by 45 ° through the third glass slide 42 to output two beams of second polarized light, and the two emergent beams of second polarized light are rotated by 45 ° through the third glass slide 42, and then rotated by 45 ° through the 45 ° faraday rotator 41 to output two beams of second polarized light.
Specifically, by combining the faraday rotator and the third glass slide, two beams of first polarized light entering and emitting into the polarization state adjusting assembly are rotated by 90 degrees to output two beams of second polarized light, the polarization states of the two beams of second polarized light emitting out of the polarization state adjusting assembly are not changed, the second polarized light is still output, and the polarization state of light in the whole light path is controlled by matching with the characteristics of the first optical assembly.
Further, and with reference to fig. 5, the light input assembly 10 includes an input end 11 for light input and a first collimating mirror 12 for light collimation, and the light output assembly 80 includes an output end 81 for light output and a second collimating mirror 82 for light collimation.
Wherein the curvature radius of the first collimating mirror 12 and the curvature radius of the second collimating mirror 82 are the same.
Specifically, the input light is incident through an input end, generates collimated light through a first collimating mirror 12, and is split by a splitting component to form two linearly polarized lights with mutually perpendicular polarization directions, namely a first polarized light and a second polarized light, wherein the polarization state of the second polarized light is changed after passing through a first glass slide with an optical axis direction of 45 degrees to form two first polarized lights with the same polarization direction, and the two first polarized lights are transmitted through a first optical assembly and then pass through a beam deformation assembly to elongate light spots in the Y direction to form elliptical light spots; for example: the round collimator light spot (X:300um, Y: 300um) can form an oval light spot (X:300um, Y:900um) after passing through the light beam deformation assembly; then the two beams of linearly polarized light with the polarization direction of 45 degrees are generated by the 45-degree Faraday rotator, and then the two beams of second polarized light with the same polarization direction are output by the third wave plate with the optical axis direction of 22.5 degrees; two beams of second polarized light are transmitted through the thin film optical filter for filtering, then the 100% reflector returns the light path, and the light path passes through the thin film optical filter again; at this time, the two beams of second polarized light pass through the third wave plate with the optical axis direction of 22.5 degrees again to generate two beams of linearly polarized light with the polarization direction of 45 degrees, and then the two beams of linearly polarized light pass through the 45-degree Faraday rotator to rotate for 45 degrees, and emergent light of the two beams of second polarized light still remains as two beams of second polarized light; the two emergent beams of second polarized light pass through the light beam deformation assembly again, and the light spots of the two emergent beams of second polarized light are restored into circular light spots; further, after passing through the first optical assembly again, the two beams of second polarized light are totally reflected twice after entering the first optical assembly and are output; one beam of second polarized light passes through a second glass slide with the optical axis direction of 45 degrees to output first polarized light, namely two beams of first polarized light and second polarized light with mutually vertical polarization directions appear at the moment; two bundles of light pass through the light-combining piece simultaneously, output the second collimating mirror and output terminal output through the same curvature radius with first collimating mirror after the output ellipsometry to realize the light path and receive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is intended to cover all equivalent changes and modifications made within the scope of the present invention.
Claims (10)
1. A narrow band tunable filter, characterized by: the narrow-band tunable filter comprises an optical input component, a light splitting component, a first optical component for changing the light transmission direction, a light beam deformation component, a polarization state adjusting component for adjusting the light polarization state, a thin film filter, a reflector, a light combining component and an optical output component;
the light source comprises a light input assembly, a light splitting assembly, a light beam deformation assembly, a light polarization state adjusting assembly, a light path adjusting assembly, a light combining assembly and a light output assembly, wherein incident light enters the light splitting assembly through the light input assembly to be split into two beams of first polarized light, the two beams of first polarized light enter the light beam deformation assembly after passing through the first optical assembly, the light beam deformation assembly changes the shape of a light spot of the first polarized light, then the light beam deformation assembly enters the light polarization state adjusting assembly and outputs two beams of second polarized light perpendicular to the polarization direction of the first polarized light, the two beams of second polarized light are filtered by the thin film filter and then irradiate to the reflector, the second polarized light is reflected by the reflector and returns to the thin film filter through the original path, then the second polarized light enters the light state adjusting assembly after the light beam.
2. The narrow band tunable filter of claim 1, wherein: the beam deformation component is two right-angle prisms arranged in pairs.
3. The narrow band tunable filter of claim 1, wherein: the light beam deformation component is a cylindrical mirror.
4. The narrow band tunable filter of claim 1, wherein: the light splitting assembly comprises a light splitting piece and a first glass slide arranged on the light splitting piece, incident light is split into first polarized light and second polarized light with mutually vertical polarization angles through the light splitting piece, and the second polarized light is emitted into the first glass slide and then outputs the first polarized light to output two beams of the first polarized light.
5. The narrow band tunable filter of claim 4, wherein: the light combination component comprises a light combination piece and a second glass slide arranged on the light combination piece, wherein one beam of second polarized light emitted by the first optical component outputs first polarized light after passing through the second glass slide, and the first polarized light and the other beam of second polarized light are emitted into the light combination piece together and form elliptically polarized light to be output.
6. The narrow band tunable filter of claim 5, wherein: the first glass slide is a half glass slide, the optical axis direction of the first glass slide is 45 degrees, the second glass slide is a half glass slide, and the optical axis direction of the second glass slide is 45 degrees.
7. The narrow band tunable filter of claim 1, wherein: the first optical assembly is a PSB (power system bus) piece with a coated film, the first polarized light is P polarized light, the second polarized light is S polarized light, two beams of input P polarized light are emitted into the polarization state adjusting assembly after passing through the PBS piece and output two beams of S polarized light, the two beams of S polarized light are emitted to the reflecting mirror after being filtered by the thin film filter, then are reflected by the reflecting mirror and return to the thin film filter in the original path and then are emitted into the polarization state adjusting assembly, then are emitted into the light combining assembly after the transmission direction of the light path of the PBS piece is changed to combine light, and form elliptical polarized light after being combined and output by the light output assembly.
8. The narrow band tunable filter of claim 1, wherein: the polarization state adjusting assembly comprises a 45-degree Faraday rotator and a third glass slide with the optical axis direction of 22.5 degrees, two beams of incident first polarized light rotate 45 degrees through the 45-degree Faraday rotator, and then rotate 45 degrees again through the third glass slide so as to output two beams of second polarized light, and two beams of emergent second polarized light rotate 45 degrees through the third glass slide and then rotate 45 degrees through the 45-degree Faraday rotator so as to output two beams of second polarized light.
9. The narrow band tunable filter of claim 1, wherein: the light input assembly comprises an input end for light input and a first collimating mirror for light collimation, and the light output assembly comprises an output end for light output and a second collimating mirror for light collimation.
10. The narrow band tunable filter of claim 9, wherein: the curvature radius of the first collimating mirror is the same as that of the second collimating mirror.
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| CN202022210666.3U CN213715621U (en) | 2020-09-30 | 2020-09-30 | Narrow-band adjustable filter |
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| CN202022210666.3U CN213715621U (en) | 2020-09-30 | 2020-09-30 | Narrow-band adjustable filter |
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Address after: 518000 No. 35, Cuijing Road, Pingshan New District, Shenzhen, Guangdong Patentee after: Ona Technology (Shenzhen) Group Co.,Ltd. Address before: No.35 Cuijing Road, Pingshan District, Shenzhen City, Guangdong Province Patentee before: O-NET COMMUNICATIONS (SHENZHEN) Ltd. |