CN214151131U - Broadband wavelength tunable optical filter - Google Patents
Broadband wavelength tunable optical filter Download PDFInfo
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- CN214151131U CN214151131U CN202023194847.8U CN202023194847U CN214151131U CN 214151131 U CN214151131 U CN 214151131U CN 202023194847 U CN202023194847 U CN 202023194847U CN 214151131 U CN214151131 U CN 214151131U
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- light beam
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- optical filter
- broadband wavelength
- wavelength tunable
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Abstract
The utility model provides a tunable optical filter of broadband wavelength, including a light beam emitter, a light beam collimating device, a grating, an optical sheet, a rotatable light beam reflection device and a light beam receiving arrangement, be an angle alpha setting between optical sheet and the rotatable light beam reflection device. The utility model discloses a tunable optical filter of broadband wavelength has improved whole light path and has inserted the loss stability, compact structure simultaneously, and the light path is simple, can realize the miniaturization.
Description
Technical Field
The utility model relates to an optical communication technical field especially relates to an optical tunable filter based on grating diffraction scheme.
Background
An optical tunable filter is a photoelectric device applied to the technical field of optical communication. In an optical fiber communication system and a sensor network, optical signals transmitted by an optical fiber need to be filtered, so that optical signals with different wavelengths are transmitted in different channels, and an optical tunable filter for filtering has various structures: prism filters, diffraction grating filters, interference filters, and the like. One of the mainstream schemes at present is to realize filtering by adopting a scheme of matching a grating with a micro-electromechanical turning mirror based on a grating diffraction principle. The basic principle is as follows: light incident on the grating has different diffraction angles for different wavelength components, thereby separating the different wavelength optical signals. The light with a certain diffraction angle is reflected to a receiving end by utilizing a rotatable reflector, so that the tunable filtering function is realized. At present, an MEMS chip is often used as a rotatable reflector, the MEMS chip conventionally adopts a TO packaging method, light reaches the MEMS rotatable mirror after passing through a TO window sheet, the conventional plane window sheet can cause an etalon effect, wavelength-related loss, peak jitter and the like are generated, the product performance is influenced, and the product can seriously lose efficacy if the product is serious.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a tunable optical filter of broadband wavelength, improves whole light path insertion loss stability, and compact structure simultaneously, the light path is simple, can realize the miniaturization.
The utility model discloses a realize like this: a broadband wavelength tunable optical filter comprises a light beam emitting device, a light beam collimating device, a grating, an optical sheet, a rotatable light beam reflecting device and a light beam receiving device, wherein an angle alpha is formed between the optical sheet and the rotatable light beam reflecting device.
Furthermore, the rotatable light beam reflection device is an MEMS rotating mirror, a TO window is packaged outside the MEMS rotating mirror, the optical sheet is a wedge-shaped optical sheet, and the wedge-shaped optical sheet is embedded on the TO window TO form a wedge-shaped TO window.
Furthermore, the rotatable light beam reflection device is an MEMS rotating mirror, a TO window is packaged outside the MEMS rotating mirror, the optical sheet is a parallel window, and the parallel window is located between the MEMS rotating mirror and the TO window and arranged at an angle with the MEMS rotating mirror.
Further, the light beam collimating device is a collimating lens.
Further, the grating is a polarization independent transmissive diffraction grating.
Further, the light beam emitting device and the light beam receiving device are double optical fiber heads.
Further, the value range of the angle alpha is 10-15 degrees.
The utility model has the advantages that:
1. an optical sheet which forms an angle is arranged in front of the rotatable light beam reflection device, and the corresponding angle is calculated, so that the etalon effect caused by the fact that light beams vertically pass through parallel window sheets is reduced, peak value fluctuation and wavelength related loss are reduced, the insertion loss stability of the whole light path is improved, and the performance of a device is improved;
2. the grating is used as a light splitting device, and simultaneously, the switching of different wavelength channels can be realized by matching with the MEMS rotating mirror;
3. the utility model discloses the light path is simple, and compact structure has reduced the dependence to the grating and MEMS chip mirror surface size's requirement, can realize the miniaturization, is fit for batch production.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the tunable broadband wavelength optical filter of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to the following examples.
Referring to fig. 1, the present invention provides a tunable optical filter with broadband wavelength, which includes a light beam emitting device 101, a light beam collimating device 103, a grating 104(204, 304), an optical sheet 105, a rotatable light beam reflecting device 106, and a light beam receiving device 102, wherein an angle α is formed between the optical sheet 105 and the rotatable light beam reflecting device 106.
In a preferred embodiment, as shown in fig. 2, the rotatable light beam reflection apparatus in the present invention is specifically a MEMS turning mirror 206, the MEMS turning mirror is driven by voltage, can adopt a single-axis two-way rotating mirror, and can also adopt a double-axis two-way rotating mirror TO realize a filtering function, a TO window is encapsulated outside the MEMS turning mirror 206, the optical sheet is a wedge-shaped optical sheet, and the wedge-shaped optical sheet is embedded in the TO window TO form a wedge-shaped TO window 205, and the angle of the wedge-shaped optical sheet is set TO an angle between 10 ° and 15 ° according TO specific needs.
In another preferred embodiment, as shown in fig. 3, the rotatable light beam reflection apparatus in the present invention is specifically a MEMS turning mirror 306, the MEMS turning mirror is driven by voltage, and can adopt a single-axis two-way rotating mirror or a double-axis two-way rotating mirror TO realize a filtering function, the MEMS turning mirror is externally packaged with a TO window 307, the optical sheet is a parallel window 305, the parallel window 305 is located between the MEMS turning mirror 306 and the TO window 307, and is set at an angle with the MEMS turning mirror, and the angle is set as required TO be an angle between 10 ° and 15 °, so that the light spot passes through the parallel window and then reaches the MEMS mirror.
Preferably, the light beam collimating device is a collimating lens, and the collimating lens is a calculated dual-fiber collimating lens, which may be a spherical lens (see 303 in fig. 3) or an aspheric lens (see 203 in fig. 2).
Preferably, the grating is a polarization independent transmissive diffraction grating.
Preferably, the light beam emitting device and the light beam receiving device are a dual-fiber head, as shown in fig. 2, which is composed of a light beam emitting portion 201, a light beam receiving portion 202 and a head portion 210, and in practical use, two devices for receiving or emitting light beams, such as the light beam emitting device 301 and the light beam receiving device 302 in fig. 3, may be arranged separately.
Preferably, the value range of the angle alpha is 10-15 degrees.
The working principle of the utility model is as follows:
the utility model discloses an among the wave filter, set up the optical sheet that is an angle before rotatable light beam reflection device TO calculate the angle that corresponds, when using, from the multi-wavelength light beam of light beam emitter transmission, convert into the beam of collimation behind the two optical fiber collimating lenses, jet into the grating, the light path is skew behind wedge TO window (or the parallel window that is certain angle), select arbitrary wavelength light beam reflection TO beam receiver via the different corners of rotatable speculum (MEMS commentaries on classics mirror) again, realize filtering capability.
The utility model discloses a set up one before rotatable light beam emitter with rotatable light beam emitter is the optical sheet of certain angle, reduces because the light beam jets into the etalon effect that parallel optics window piece brought perpendicularly, reduces peak value fluctuation and wavelength correlation loss, has improved whole light path and has inserted and decrease stability, promotes device Ripple and WDL performance, simultaneously the utility model discloses the light path is simple, and compact structure has reduced the requirement to the reliance of grating and MEMS chip mirror surface size, can realize the miniaturization, is fit for batch production.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (7)
1. A broadband wavelength tunable optical filter, characterized by: the device comprises a light beam emitting device, a light beam collimating device, a grating, an optical sheet, a rotatable light beam reflecting device and a light beam receiving device, wherein an angle alpha is formed between the optical sheet and the rotatable light beam reflecting device.
2. A broadband wavelength tunable optical filter according to claim 1, wherein: the rotatable light beam reflecting device is an MEMS rotating mirror, a TO window is packaged outside the MEMS rotating mirror, the optical sheet is a wedge-shaped optical sheet, and the wedge-shaped optical sheet is embedded on the TO window TO form a wedge-shaped TO window.
3. A broadband wavelength tunable optical filter according to claim 1, wherein: the rotatable light beam reflecting device is an MEMS rotating mirror, a TO window is packaged outside the MEMS rotating mirror, the optical sheet is a parallel window, and the parallel window is located between the MEMS rotating mirror and the TO window and arranged at an angle with the MEMS rotating mirror.
4. A broadband wavelength tunable optical filter according to claim 1, wherein: the light beam collimating device is a collimating lens.
5. A broadband wavelength tunable optical filter according to claim 1, wherein: the grating is a polarization independent transmissive diffraction grating.
6. A broadband wavelength tunable optical filter according to claim 1, wherein: the light beam emitting device and the light beam receiving device are double optical fiber heads.
7. A broadband wavelength tunable optical filter according to any one of claims 1 to 6, wherein: the value range of the angle alpha is 10-15 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023194847.8U CN214151131U (en) | 2020-12-25 | 2020-12-25 | Broadband wavelength tunable optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023194847.8U CN214151131U (en) | 2020-12-25 | 2020-12-25 | Broadband wavelength tunable optical filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214151131U true CN214151131U (en) | 2021-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023194847.8U Active CN214151131U (en) | 2020-12-25 | 2020-12-25 | Broadband wavelength tunable optical filter |
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|---|---|
| CN (1) | CN214151131U (en) |
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2020
- 2020-12-25 CN CN202023194847.8U patent/CN214151131U/en active Active
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