CN203535312U - Grating-type optical tunable filter - Google Patents
Grating-type optical tunable filter Download PDFInfo
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- CN203535312U CN203535312U CN201320602377.5U CN201320602377U CN203535312U CN 203535312 U CN203535312 U CN 203535312U CN 201320602377 U CN201320602377 U CN 201320602377U CN 203535312 U CN203535312 U CN 203535312U
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- grating
- light
- filter
- wave plate
- quarter wave
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Abstract
The utility model discloses a grating-type optical tunable filter, and the filter comprises a light beam transmitting device, a light beam receiver, a lens group, a grating, and a quarter wave plate. The filter is characterized in that the filter also comprises a rotatable reflector; multi-wavelength light beams transmitted from the light beam transmitting device are converted into parallel light beams through the lens group, and are emitted into the grating; a polarization state is changed through the quarter wave plate; and a light beam with any wave length is selected through a corner of the rotatable reflector and transmitted to the light beam receiver. The filter provided by the utility model is advantageous in that light with different wavelengths can be received when the rotatable reflector rotates different angles, thereby achieving the purpose of tuning; an optical path is simple and convenient to adjust; and the filter is more suitable for batch production.
Description
Technical field
The utility model relates to a kind of optic tunable filter, relates in particular to a kind of optic tunable filter that utilizes grating.
Background technology
Optical filter is of a great variety, and structure is various, but roughly can be divided into three types by filtering principle: prism wave filter, diffraction grating wave filter and interference filter.Prism-type optical filter is optically filtering device the earliest, and it is to utilize prism to have different refractivity to the light of different wave length, thereby makes the light of different frequency have different deflection angles, finally reaches the function of filtering.Prism-type wave filter has stronger peak transmittance, is glass prism, so cheap due to what adopt.But because prism is block elements, its abbe number is little, so the broader bandwidth of prism-type wave filter can not be used as narrow band filter, and volume is larger, therefore in optical fiber telecommunications system, generally do not adopt prism.Diffraction grating wave filter is while utilizing incident light to incide grating surface, and each wavelength component is towards different some diffraction in space, thereby different wavelengths of light is separated, and realizes filter function.Comprise the various ways such as traditional diffraction grating form, fiber grating form and waveguide optical grating form.Interference filter is another kind of main optically filtering form, and ultimate principle is the Fabry-Perot interference cavity based on multiple-beam interference, and tuning manner has electrooptical effect, thermo-optic effect, piezoelectric effect and acoustooptic effect etc.In conjunction with MEMS technology, can form diffraction and the interference filter of MEMS form, be conducive to the miniaturization of device and accurately control.
Summary of the invention
It is low, simple in structure that an object of the present utility model is to provide a kind of cost, stable performance, the grating light tuning filter that reliability is higher.
In order to reach as above object, the utility model grating light tuning filter comprises beam launcher, beam receiver, lens combination, grating, quarter wave plate, also comprise rotary reflector, wherein, multi-wavelength light beam from beam launcher transmitting, is converted to parallel beam via lens combination, injects grating, by being changed after polarization state by quarter wave plate, then select arbitrary wavelength light beam to reflex to beam receiver via the corner of above-mentioned rotary reflector.
Wherein, preferential embodiment is: the polarization state that changes incident light by optical axis direction and the angle that incides the light of quarter wave plate of change quarter wave plate.
Wherein, preferential embodiment is: beam launcher adopts two optical fiber pigtail forms.
Wherein, preferential embodiment is: beam receiver adopts two optical fiber pigtail forms.
The utility model has the advantage of: during incident light process grating, the Insertion Loss value of the light of different mode (TE, TM) is different, and quarter wave plate is set after grating, reduce the relevant Insertion Loss (PDL) of polarization; Meanwhile, rotary reflector turns over the light that different angles can receive different wave length, thereby reaches tuning object; And the simple and convenient adjusting of this light path, is applicable to batch production more.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the index path of the utility model grating light tuning filter.
Embodiment
As shown in Figure 1, the utility model grating light tuning filter comprises beam launcher 12, beam receiver 13, lens combination 14, grating 15, quarter wave plate 16 and rotary reflector 17, wherein after beam launcher 12 transmitting multi-wavelength incident lights, via lens combination 14, be converted into after directional light, via grating 15, carry out after diffraction, dispersion, via quarter wave plate 16, change after polarization state
Via rotary reflector 17, select wavelength Hou Yanyuan road to be back to beam receiver 13 again.
Referring to Fig. 1, details are as follows for its light path principle, from the multi-wavelength light beam λ of beam launcher 12 transmittings
1, λ
2, λ
3... λ
n, scioptics group 14 is converted to parallel beam λ
1', λ
2', λ
3' ... λ
n', parallel beam λ
1', λ
2', λ
3' ... λ
n' be radiated in the plane of the grating 15 that becomes 90-θ (the BRAGG angle that θ=46.56 are grating) with lens 14 optical axises parallel beam λ
1', λ
2', λ
3' ... λ
n' through grating 15 diffraction generation dispersions, become linearly polarized light L
1, L
2, L
3... L
n, linearly polarized light L
1, L
2, L
3... L
ndirection of vibration and the optical axis direction of quarter wave plate 16 be set to 45 °, so linearly polarized light L
1, L
2, L
3... Ln becomes circularly polarized light C after via quarter wave plate 16
1, C
2, C
3... C
n, circularly polarized light C
1, C
2, C
3... C
nvia becoming circularly polarized light C after rotary reflector 17 reflections
1', C
2', C
3' ... C
n', circularly polarized light C
1', C
2', C
3' ... C
n' again after the secondary polarization of quarter wave plate 16, become linearly polarized light L
1', L
2', L
3' ... L
n', linearly polarized light L now
1', L
2', L
3' ... L
n' direction of vibration and the optical axis direction of quarter wave plate 16 be 45° angle, i.e. linearly polarized light L
1, L
2, L
3... L
nwith corresponding linearly polarized light L
1', L
2', L
3' ... angle between Ln ' is 90 °; Linearly polarized light L
1', L
2', L
3' ... L
n' via grating 15 re-diffractions, dispersion, via lens combination 14 is rear, by beam receiver 13, received again again.
By the optical axis direction that quarter wave plate 16 is set and the angle that incides the light of quarter wave plate 16, change the polarization state of incident light.
By rotating the rotation of catoptron 17, select the light of satisfactory wavelength to return through original optical path, by beam receiver 13, receive.Rotation catoptron 17 turns over different angle beam receivers 13 and can receive the light of different wave length, thereby reaches tuning object.
In above-described embodiment, beam launcher 12, a beam receiver 13 can adopt two optical fiber pigtail forms, and the input optical fibre being positioned on lens combination 14 focal planes is similar to pointolite.
The utility model has the advantage of: during incident light process grating 15, the Insertion Loss value of the light of different mode (TE, TM) is different, and quarter wave plate 16 is set after grating 15, reduce the relevant Insertion Loss (PDL) of polarization; Meanwhile, rotary reflector 17 turns over the light that different angles can receive different wave length, thereby reaches tuning object; And the simple and convenient adjusting of this light path, is applicable to batch production more.
As described above, be only the utility model most preferred embodiment, and not for limiting scope of the present utility model, all equivalences of doing according to the utility model claim change or modify, and are all the utility model and contain.
Claims (4)
1. grating light tuning filter comprises a beam launcher, a beam receiver, a lens combination, a grating, a quarter wave plate, it is characterized in that: also comprise a rotary reflector, wherein, multi-wavelength light beam from beam launcher transmitting, via lens combination, be converted to parallel beam, inject grating, by being changed after polarization state by quarter wave plate, then select arbitrary wavelength light beam to reflex to beam receiver via the corner of above-mentioned rotary reflector.
2. grating light tuning filter as claimed in claim 1, is characterized in that: the polarization state that changes incident light by optical axis direction and the angle that incides the light of quarter wave plate of change quarter wave plate.
3. grating light tuning filter as claimed in claim 1, is characterized in that: beam launcher adopts two optical fiber pigtail forms.
4. grating light tuning filter as claimed in claim 1, is characterized in that: beam receiver adopts two optical fiber pigtail forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320602377.5U CN203535312U (en) | 2013-09-24 | 2013-09-24 | Grating-type optical tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320602377.5U CN203535312U (en) | 2013-09-24 | 2013-09-24 | Grating-type optical tunable filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203535312U true CN203535312U (en) | 2014-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320602377.5U Expired - Fee Related CN203535312U (en) | 2013-09-24 | 2013-09-24 | Grating-type optical tunable filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI513938B (en) * | 2014-10-01 | 2015-12-21 | 錼創科技股份有限公司 | Optical module |
| CN105823761A (en) * | 2016-04-08 | 2016-08-03 | 吉林大学 | Filter system |
| CN105866940A (en) * | 2016-05-11 | 2016-08-17 | 昂纳信息技术（深圳）有限公司 | Optical filter with adjustable width and wavelength |
| CN109425431A (en) * | 2017-08-31 | 2019-03-05 | 福州高意通讯有限公司 | It is a kind of to use MEMS super-small spectrometer |
-
2013
- 2013-09-24 CN CN201320602377.5U patent/CN203535312U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI513938B (en) * | 2014-10-01 | 2015-12-21 | 錼創科技股份有限公司 | Optical module |
| US10047918B2 (en) | 2014-10-01 | 2018-08-14 | PlayNitride Inc. | Optical module |
| CN105823761A (en) * | 2016-04-08 | 2016-08-03 | 吉林大学 | Filter system |
| CN105823761B (en) * | 2016-04-08 | 2018-07-17 | 吉林大学 | A kind of filtering system |
| CN105866940A (en) * | 2016-05-11 | 2016-08-17 | 昂纳信息技术（深圳）有限公司 | Optical filter with adjustable width and wavelength |
| CN105866940B (en) * | 2016-05-11 | 2018-11-27 | 昂纳信息技术（深圳）有限公司 | The optical filter of one bandwidth and Wavelength tunable |
| CN109425431A (en) * | 2017-08-31 | 2019-03-05 | 福州高意通讯有限公司 | It is a kind of to use MEMS super-small spectrometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20140924 |
|
| EXPY | Termination of patent right or utility model |