CN105785514A - Flat-top optical filter - Google Patents
Flat-top optical filter Download PDFInfo
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- CN105785514A CN105785514A CN201410823927.5A CN201410823927A CN105785514A CN 105785514 A CN105785514 A CN 105785514A CN 201410823927 A CN201410823927 A CN 201410823927A CN 105785514 A CN105785514 A CN 105785514A
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Abstract
The invention discloses a flat-top optical filter comprising a comb filter disposed on an optical path. The flat-top optical filter is characterized in that the comb filter is used to divide the optical path into two paths, and every path is sequentially provided with a collimator, a beam expanding shaping system, a chromatic dispersion element, a focusing system, and a reflection surface array; and the reflection surface array is disposed on a focal plane of a back part of a focusing system. The flat-top optical filter is advantageous in that the Interleaver is added to the front part of the raster chromatic dispersion optical path, and the light of various channels of the raster original focusing surface is provided with one space gap, and therefore the optical energy loss caused by the diffraction effect of the micro-optical unit on the focusing plane can be eliminated or reduced; and at the same time, because the wavelengths of various beams are discontinuous, the size of the frequency-selecting reflection surface can be doubled, and the influence of the hard-edged diffraction can be reduced; and the flat-top optical filter is used for the DWDM module and the WSS module.
Description
Technical field
This patent is for relating to optical communication device field, particularly relate to a kind of flat-head type optical filter, be applied to the upper and lower multiplexing demultiplexing device of the reconfigurable light path (ROADM) in dense wave division multipurpose (DWDM) system and light cross interconnected (OXC) aspects such as system and sensing network.
Background technology
The tunable optical filter of flat-head type is a kind of basic optical element, and it is essentially bandpass-type wave filter, namely only allows specific wavelength signal to pass through, and other wavelength signals reflect away.It can apply to the reconfigurable light path ROADM in dwdm system and the aspects such as OXC system and sensing network.As being used for offsetting the gain tilt of image intensifer, thus the deviation reduced between the channel of each receiving terminal optical signal power.
The scheme of current scheme many employings MEMS array, the program, due to the gap existed between the hard-edge diffraction effect of micromirror edges and micro mirror, can cause that bigger device Insertion Loss and interchannel Insertion Loss are inconsistent.
Summary of the invention
For the problems referred to above, it is an object of the invention to provide and can realize centre wavelength, bandwidth is discrete adjustable, the flat-head type optical filter of the filter curve that filter with low insertion loss, edge are precipitous.
For reaching above-mentioned purpose, technical scheme proposed by the invention is: a kind of flat-head type optical filter, it is characterized in that: include the comb filter (Interleaver) being located in light path, light path is divided into two-way by described comb filter, and every road light path be sequentially provided with collimator, expand orthopedic systems, dispersion element, focusing system, reflecting surface array；Described array reflecting surface is located on the focal plane after focusing system.
Preferably, described dispersion element can be grating.
Preferably, described focusing system can be globe lens.
Preferably, described reflecting surface array is micro-electromechanical reflective face (MEMS) array, or liquid crystal array.
Adopt technique scheme, flat-head type optical filter of the present invention, the light of each passage on the former focusing surface of grating is made to have a spatial joint clearance on focal plane by adding Interleaver before grating dispersion light path, thus eliminating or reducing the optical energy loss introduced by the diffraction effect of micro-optic cell edges on focussing plane；Simultaneously because each bundle optical wavelength is discontinuous, frequency-selecting reflecting surface can increase and is twice, and reduces the impact of hard-edge diffraction；Can be applicable to DWDM module, WSS module.
Accompanying drawing explanation
Fig. 1 is the wavelength selecting device result schematic diagram described in prior art；
Fig. 2 is the schematic diagram after Fig. 1 dispersion；
Fig. 3 is flat-head type optical filter structural representation Fig. 1 of the present invention；
Fig. 4 is based on DWDM structural representation of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Fig. 1 is the design diagram of the wavelength selecting device of prior art；Input light first passes through collimator 10 and collimates, and then passes through beam-expanding system 20 shaping, is radiated at dispersion element 30(such as grating subsequently) on, therefore, light beam is able to be spatially separating；Light beam after dispersion is again through focusing system 40(such as globe lens), focal plane 50 arranges successively with wavelength, as in figure 2 it is shown, 201 be wherein focal plane, 202 is dispersion hot spot；MEMS array (not shown) is placed on focal plane 50 place, due to the wavelength that each unit in array is corresponding different, the light of different wave length can be made to point to different light paths by controlling the angle of micro mirror, thus realizing the function that wavelength selects.The hot spot of a certain wavelength has the dimensions at focal plane place tool, and the ratio of this size and micromirror size determines the wavelength resolution of device.(crossing over two mirror units) when the hot spot of certain wavelength is radiated at mirror unit edge, due to the gap existed between hard-edge diffraction effect and micro mirror, causing that bigger device Insertion Loss and interchannel Insertion Loss are inconsistent, thus reducing the performance of device.
For solving the problems referred to above, the application devises structure as shown in Figure 3；Compared to Figure 1, Fig. 3 adds an Interleaver60 at input, and its effect is by adjacent wavelength separated, introduces different sub-light paths by the odd even of wavelength sequence number；Sub-light path is identical with the light channel structure of Fig. 1, including collimator 10, beam-expanding system 20, dispersion element 30, focusing system 40 and MEMS array (not shown)；By the wavelength separated effect of Interleaver60, at the focal plane place wavelength of two sub-light paths discontinuous, by selecting suitable mirror unit size and location, it is possible to avoid the occurrence of hot spot and cross over the situation of multiple mirrors unit, thus evading Fig. 1 light path Problems existing.
As shown in Figure 4, a DWDM based on the application design is given；The MEMS array at focal plane 50 place may alternatively be fiber array 70；Discontinuous due to each bundle optical wavelength, the optical fiber bore of frequency-selecting position can increase and is twice, and reduces the Insertion Loss of device.
Although specifically showing in conjunction with preferred embodiment and describing the present invention; but those skilled in the art should be understood that; in the spirit and scope without departing from appended claims invention defined; in the form and details the present invention is made a variety of changes, be protection scope of the present invention.
Claims (5)
1. a flat-head type optical filter, it is characterized in that: include the comb filter being located in light path, light path is divided into two-way by described comb filter, and every road light path be sequentially provided with collimator, expand orthopedic systems, dispersion element, focusing system, reflecting surface array；Described array reflecting surface is located on the focal plane after focusing system.
2. a kind of flat-head type optical filter according to claim 1, it is characterised in that: described dispersion element is grating.
3. a kind of flat-head type optical filter according to claim 1, it is characterised in that: described focusing system is globe lens.
4. a kind of flat-head type optical filter according to claim 1, it is characterised in that: described reflecting surface array is micro-electromechanical reflective face array.
5. a kind of flat-head type optical filter according to claim 1, it is characterised in that: described reflecting surface array is liquid crystal array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823927.5A CN105785514A (en) | 2014-12-26 | 2014-12-26 | Flat-top optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410823927.5A CN105785514A (en) | 2014-12-26 | 2014-12-26 | Flat-top optical filter |
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| Publication Number | Publication Date |
|---|---|
| CN105785514A true CN105785514A (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410823927.5A Pending CN105785514A (en) | 2014-12-26 | 2014-12-26 | Flat-top optical filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175903A (en) * | 2020-01-07 | 2020-05-19 | 华中科技大学 | Ultra-wide band adjustable optical filter based on MEMS |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299200A (en) * | 2000-11-30 | 2001-06-13 | 华中科技大学 | Interleaver |
| US20080085119A1 (en) * | 2006-10-04 | 2008-04-10 | Dicon Fiberoptics, Inc. | Compact High-Resolution Tunable Optical Filter Using Optical Diffraction Element and a Mirror |
| CN201716477U (en) * | 2010-07-29 | 2011-01-19 | 福州高意通讯有限公司 | Interleaver structure |
| CN102226848A (en) * | 2011-06-03 | 2011-10-26 | 孙方红 | Structure for wavelength selection switch |
| CN103018837A (en) * | 2011-09-28 | 2013-04-03 | 福州高意光学有限公司 | Dimmable filter |
| CN103969745A (en) * | 2013-01-30 | 2014-08-06 | 福州高意通讯有限公司 | Bandwidth-adjustable flat-top optical filter based on DLP |
| CN203799055U (en) * | 2014-04-24 | 2014-08-27 | 福州高意通讯有限公司 | Comb-type filter |
| CN104090362A (en) * | 2014-07-28 | 2014-10-08 | 华中科技大学 | Tunable flat top narrow-band type optical fiber based on MEMS |
-
2014
- 2014-12-26 CN CN201410823927.5A patent/CN105785514A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299200A (en) * | 2000-11-30 | 2001-06-13 | 华中科技大学 | Interleaver |
| US20080085119A1 (en) * | 2006-10-04 | 2008-04-10 | Dicon Fiberoptics, Inc. | Compact High-Resolution Tunable Optical Filter Using Optical Diffraction Element and a Mirror |
| CN201716477U (en) * | 2010-07-29 | 2011-01-19 | 福州高意通讯有限公司 | Interleaver structure |
| CN102226848A (en) * | 2011-06-03 | 2011-10-26 | 孙方红 | Structure for wavelength selection switch |
| CN103018837A (en) * | 2011-09-28 | 2013-04-03 | 福州高意光学有限公司 | Dimmable filter |
| CN103969745A (en) * | 2013-01-30 | 2014-08-06 | 福州高意通讯有限公司 | Bandwidth-adjustable flat-top optical filter based on DLP |
| CN203799055U (en) * | 2014-04-24 | 2014-08-27 | 福州高意通讯有限公司 | Comb-type filter |
| CN104090362A (en) * | 2014-07-28 | 2014-10-08 | 华中科技大学 | Tunable flat top narrow-band type optical fiber based on MEMS |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111175903A (en) * | 2020-01-07 | 2020-05-19 | 华中科技大学 | Ultra-wide band adjustable optical filter based on MEMS |
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Application publication date: 20160720 |
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