CN106918868A - The method for improving of spatial spectral dividing filter wavelength resolution - Google Patents
The method for improving of spatial spectral dividing filter wavelength resolution Download PDFInfo
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- CN106918868A CN106918868A CN201710130577.8A CN201710130577A CN106918868A CN 106918868 A CN106918868 A CN 106918868A CN 201710130577 A CN201710130577 A CN 201710130577A CN 106918868 A CN106918868 A CN 106918868A
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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
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Abstract
The present invention relates to the method for improving of spatial spectral dividing filter resolution ratio.The wave filter includes input waveguide, filter module functional block, output waveguide, on the premise of the indoor design of spatial spectral dividing filter is not changed, by changing the mould field coupled characteristic of input collimater and output collimator come the bandwidth of compression filter, the resolution ratio of boostfiltering device；Including the input and output single mode waveguide using different mode field diameters, different collimator lens characteristics, single mode waveguide is typically single-mode fiber.This method is obviously improved the wavelength resolution ability of optical fiber+grating type spectral manipulation and analysis product, the FWHM compressions about 20% of product by the characteristic for changing input-output optical fiber and colimated light system on the premise of internal light path design is not changed.
Description
Technical field
The present invention relates to spectral manipulation and the wavelength resolution technology of analysis product, and in particular to spatial spectral separate type is filtered
The method for improving of device resolution ratio.
Background technology
The optical filter of thinking is separated based on spatial spectral, adjustable filter, fixed wave filter can be divided into.It is empty
Between dispersion mode common are prism dispersion formula, various raster patterns, array waveguide grating formula, acousto-optic optical filter etc..
As shown in fig. 6, traditional tunable filter for 1. flashlight enters into by the incident optical of tunable filter can
Tunable filter functions of modules block is 3. internal, through the flashlight that filtering again by the output optical fibre of tunable filter 2. export for
Other functions module uses such as photodiode.
The several frequently seen implementation of optical channel watch-dog is as follows：
MEMS Grating flexibility ratios are relatively high, and wavelength resolution and noise isolation degree are in the shape of medium preference
State, wherein wavelength resolution are somewhat short of.
Chinese Patent Application No. is that 201310116824 document discloses a kind of tunable filter based on grating, is one
Plant typical MEMS grating type tunable filters, including optical fiber collimator, beam-expanding system, grating, speculum；
It causes that optical wavelength is produced and is spatially separating using the strong chromatic dispersion effects of grating, so as to only exist one in output optical fibre
Passage or narrow wave band.
Grating type tunable filter, its bandwidth typically can reduce certain level by known number of ways, and these are on the way
Footpath common are increase slit diaphragm, increase spreading distance, increases grating and penetrate the modes such as number of times, can correspondingly cause to introduce narrow
Seam precise control system, increase product size and cost, increase grating number etc. add unfavorable result, and the spectrum for being reached
Bandwidth is also all limited.
Another angle, optical-fiber network quickly develops, such as flexible grid technology, multi-subcarrier technology etc. are resulted in
Signal complexity is significantly lifted, therefore demand parameter which results in optical channel watch-dog is also constantly lifted.
In order to reach above-mentioned index request, manufacturer controls cost as far as possible on the basis of product quality is ensured again, that
The further measure of compression tunable filter bandwidth and idea will be excavated.
Foregoing MEMS Grating optical channels watch-dog is usually applied in fiber optic communication systems, therefore optical interface one
As be telecommunication optical fiber, that is, meet the general single mode fiber of G652 specifications.It is typically designed using this based on this general single mode
Single fiber (input and output are simple optical fiber) Pigtail of optical fiber, double fine (input and output are respectively an optical fiber) Pigtail or
Two single fiber Pigtail structures.
The document of Chinese Patent Application No. 201410362340 discloses a kind of tunable flat-top arrowband type based on MEMS
Optical filter, introduces a kind of trial for converting input-output optical fiber, so as to reach the effect of box-shaped spectra, but its defect
Also it is obvious.On the one hand MEMS mirror being placed into behind grating can cause the size of MEMS mirror very big, even if
A shrink beam prism, but effect still very big and that wavelength dispersion can be reduced can be added before MEMS mirror as described in it；Separately
On the one hand patent requirements input is general single mode fiber, is output as multimode fibre or less fundamental mode optical fibre, and this is clearly by analysis
Run counter to and improve wavelength resolution, be inappropriate.
The document of Chinese Patent Application No. 200980145964 discloses tunable optical filter, it is proposed that repeatedly pass through
Thinking, i.e., do not do to tunable filter structure obvious change in itself, only do some simple adjustment in periphery is carried with reaching
Rise the purpose of tunable filter performance.But, the patent, will certainly be to the Insertion Loss of tunable filter using the thinking repeatedly passed through
There is discount at double, such as the insertion loss of a tunable filter is 3dB originally, using insertion loss after the patented technology extremely
I haven't seen you for ages increases to 6dB, but the spectral bandwidth for being compressed is not obvious.
The content of the invention
It is contemplated that at least solving one of technical problem in above-mentioned correlation technique to a certain extent.It is this present invention
A kind of method for improving of spatial spectral dividing filter resolution ratio is provided, on the premise of internal light path design is not changed, is led to
Cross and change the characteristic of input-output optical fiber and colimated light system and be obviously improved spatial spectral separate type spectral manipulation and analysis product
Wavelength resolution ability, such as optical fiber type optical channel performance watch-dog, optical fiber type spectrometer, optical fiber type tunable filter.
To realize above-mentioned technique effect, the technical scheme is that：Spatial spectral dividing filter resolution ratio is carried
Lifting method, the wave filter includes input waveguide, filter module functional block, output waveguide, it is characterised in that：Do not changing sky
Between spectrum dividing filter indoor design on the premise of, by change input collimater and output collimator mould field couple
Characteristic comes the bandwidth of compression filter, the resolution ratio of boostfiltering device；Including the input and output single mode using different mode field diameters
Waveguide, different collimator lens characteristics, single mode waveguide is typically single-mode fiber.
According to embodiments of the present invention, the spatial spectral dividing filter includes prism dispersion formula, raster pattern, acousto-optic light
Learn wave filter.
According to embodiments of the present invention, the input collimater uses large mode field diameter optical fiber, output collimator to use small mould
The optical fiber of field diameter.
According to embodiments of the present invention, the input collimater and output collimator are the double-fiber collimators of common lens.
According to embodiments of the present invention, the input collimater and output collimator are using two single fibers of separate lenses
Collimater.
According to embodiments of the present invention, the output collimator, using between the different focal lengths of lens or different lens fibers
Away from so that the emergent light spot of input single optical fiber calibrator is less than output collimator.
According to embodiments of the present invention, the output collimator, using the different focal lengths of lens and different lens fiber spacing,
So that the emergent light spot of input single optical fiber calibrator is less than output collimator.
According to embodiments of the present invention, the input collimater and output collimator use two of identical mode field diameter optical fiber
There is the single optical fiber calibrator of separate lenses, wherein the hot spot of output collimator is more than input collimater hot spot.
According to embodiments of the present invention, the focal length of lens is accurate less than output collimator or input used by the input collimater
The optical fiber lens of straight device are smaller than output collimator.
According to embodiments of the present invention, the focal length of lens is less than output collimator used by the input collimater, and input is accurate
The optical fiber lens of straight device are smaller than output collimator.
The beneficial effects of the invention are as follows：
This method is directed to problems of the prior art, proposes the corrective measure of a kind of low cost and high reliability, should
Measure can be used to be lifted the grating type tunable filter of MEMS tilting mirrors or the wavelength point of the optical channel watch-dog based on this wave filter
Resolution.
This method lifts the wavelength resolution of optical fiber optical channel watch-dog, its FWHM is compressed about 20%.
This method changes collimation on the premise of internal light path design is not changed by changing the methods such as input-output optical fiber
The coupled characteristic of system is obviously improved the wavelength resolution ability of optical fiber+grating type spectral manipulation and analysis product, such as optical fiber type light
Channel performance watch-dog, optical fiber type spectrometer, optical fiber type tunable filter etc..
This method for the further compression bandwidth of spatial spectral dividing filter is provided it is a kind of it is practical, be easily achieved
And beneficial to the effective measures produced in enormous quantities.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Fig. 1 is prism dispersion formula filtering principle figure.
Fig. 2 is raster pattern filtering principle figure.
Fig. 3 is Waveguide array formula schematic diagram.
Fig. 4 is acousto-optic optically filtering schematic diagram.
Fig. 5 is improved structure configuration figure.
Fig. 6 is spatial spectral dividing filter structural representation.
Fig. 7 is ordinary optic fibre and small mode field diameter optical fiber structure schematic diagram.
Fig. 8 is the mould factory Energy distribution comparison diagram of ordinary optic fibre and small mode field diameter optical fiber.
Fig. 9 is influence figure of the output optical fibre mode field diameter to bandwidth.
Figure 10 is the relation of the bandwidth with mode field diameter of the tunable filter based on common MEMS optical grating constructions.
Specific embodiment
Invention is described further below in conjunction with the accompanying drawings.
Spatial spectral dividing filter includes prism dispersion formula, raster pattern, Waveguide array formula, acousto-optic optical filter,
General principles figure difference is as shown in Figure 1, Figure 2, Figure 3, Figure 4.
The technical program be directed to prism dispersion formula, raster pattern, acousto-optic optical filter, can by three it is abstract be a sky
Between dispersion element, spatial dispersion element is inside filter module functional block；The key of the technical program is adjustment input and output
Optical fiber pair parameter, in particular input optical fibre be general single mode fiber, output optical fibre is the optical fiber of small mode field diameter, such as scheme
5th, shown in Fig. 6.
As shown in fig. 6, traditional tunable filter for 1. flashlight enters into by the incident optical of tunable filter can
Tunable filter functions of modules block is 3. internal, through the flashlight that filtering again by the output optical fibre of tunable filter 2. export for
Other functions module uses such as photodiode.
2. output optical fibre is then only set to the technical program a kind of optical fiber model of small mode field diameter, such as Fig. 7, light
Shown in Energy distribution Fig. 8 of fine radial direction.
Under above-mentioned design, based on ray tracing and Gaussian Beam Transformation and coupling Simulation under, with output optical fibre
Mode field diameter is less and less, and typically, that is, the NA values of output optical fibre are increasing, and the bandwidth of tunable filter is just increasingly
It is small, as shown in Figure 9 and Figure 10.
As can be seen here, this method is for the further compression bandwidth of tunable filter provides a kind of practical and is easy to
Realize and beneficial to the effective measures produced in enormous quantities.
Further scheme is the optical fiber that input and output side is all replaced into small mould field, by the ginseng for adjusting collimater
Number, eliminates the additional coupling loss of single collimater mould field adaptation, and input optical fibre can be using collimation with the connection of external fiber
Device conversion carries out mould field adaptation.
On the premise of input and output optical fibre mould field are inconsistent, the collimater of two-wire can be replaced into two characteristics
The single line collimater matched somebody with somebody, excuse me, but I must be leaving now the excess loss of introducing for eliminating mould field.
It is that the 201310116824 MEMS Grating optical channels being related to are supervised for Chinese Patent Application No. in background technology
Tradition is only based on MEMS by control device, the corrective measure of the low cost and high reliability that are proposed according to the technical program, measure
The input-output optical fiber of grating type tunable filter or the optical channel watch-dog based on this does some adjustment, and other optical components are not
Just can without increasing the bulk of product in foregoing various effort by doing the fine setting that substantially change is only done in coupling regulation
Further compress its bandwidth or lifting wavelength resolution.
As typical case, based on the tunable filter of common MEMS optical grating constructions, output it optical fiber and be replaced by small mould
The winged BI1012-A of field Commercial fibers such as Corning HI 1060FLEX or long, may be such that the FWHM of product reduces about 20%.
The technical program be equally applicable to that Chinese Patent Application No. 201410362340 is related to it is a kind of based on MEMS can
Tuning flat-top arrowband type optical filter, the skill of the tunable optical filter that Chinese Patent Application No. 200980145964 is related to
Art is improved.
This method further reduces the bandwidth of tunable filter, and noise isolation degree is not done and compromise.
This method is conducive to the spectrometric instrument based on tunable filter further to lift the resolving power of oneself, because
Resolving power is almost the most crucial index of this quasi-instrument or device.
This method is in optical communication field so that the performance based on optical channel watch-dog is further lifted, and is not sacrificing product
On the premise of q＆r, it is allowed to meet more complicated optical-fiber network demand.
This method is in spectrum analysis field so that the resolving power lifting to spectrum, the detection of measuring targets is more complete
Face.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
Can these embodiments be carried out with various changes, modification, replacement and modification in the case of departing from principle of the invention and objective, this
The scope of invention is limited by claim and its equivalent.
Claims (10)
1. the method for improving of spatial spectral dividing filter resolution ratio, the wave filter includes input waveguide, filter module
Functional block, output waveguide, it is characterised in that：On the premise of the indoor design of spatial spectral dividing filter is not changed, lead to
Cross and change the bandwidth that the mould field coupled characteristic for being input into collimater and output collimator carrys out compression filter, the resolution of boostfiltering device
Rate；Including the input and output single mode waveguide using different mode field diameters, different collimator lens characteristics, single mode waveguide is typically single
Mode fiber.
2. the method for improving of spatial spectral dividing filter resolution ratio according to claim 1, it is characterised in that：It is described
Spatial spectral dividing filter includes prism dispersion formula, raster pattern, acousto-optic optical filter.
3. the method for improving of spatial spectral dividing filter resolution ratio according to claim 1, it is characterised in that：It is described
Input collimater uses large mode field diameter optical fiber, output collimator to use the optical fiber of small mode field diameter.
4. the method for improving of spatial spectral dividing filter resolution ratio according to claim 3, it is characterised in that：It is described
Input collimater and output collimator are the double-fiber collimators of common lens.
5. the method for improving of spatial spectral dividing filter resolution ratio according to claim 3, it is characterised in that：It is described
Input collimater and output collimator are using two single optical fiber calibrators of separate lenses.
6. the method for improving of spatial spectral dividing filter resolution ratio according to claim 5, it is characterised in that：It is described
Output collimator, using the different focal lengths of lens or different lens fiber spacing so that the outgoing of input single optical fiber calibrator
Hot spot is less than output collimator.
7. the method for improving of spatial spectral dividing filter resolution ratio according to claim 5, it is characterised in that：It is described
Output collimator, using the different focal lengths of lens and different lens fiber spacing so that the emergent light of input single optical fiber calibrator
Spot is less than output collimator.
8. the method for improving of spatial spectral dividing filter resolution ratio according to claim 1, it is characterised in that：It is described
The single optical fiber calibrator that input collimater and output collimator have a separate lenses using two of identical mode field diameter optical fiber, wherein
The hot spot of output collimator is more than input collimater hot spot.
9. the method for improving of spatial spectral dividing filter resolution ratio according to claim 8, it is characterised in that：It is described
It is accurate that the focal length of lens used by input collimater is smaller than output less than the optical fiber lens of output collimator or input collimater
Straight device.
10. the method for improving of spatial spectral dividing filter resolution ratio according to claim 8, it is characterised in that：Institute
The focal length of lens used by input collimater is stated less than output collimator, and the optical fiber lens of input collimater are smaller than output standard
Straight device.
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| CN201710130577.8A CN106918868B (en) | 2017-03-07 | 2017-03-07 | Method for improving wavelength resolution of spatial spectrum separation type filter |
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| CN201710130577.8A CN106918868B (en) | 2017-03-07 | 2017-03-07 | Method for improving wavelength resolution of spatial spectrum separation type filter |
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| CN106918868B CN106918868B (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694103A (en) * | 2020-06-30 | 2020-09-22 | 昂纳信息技术（深圳）有限公司 | Design method of optical filter |
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| CN103018837A (en) * | 2011-09-28 | 2013-04-03 | 福州高意光学有限公司 | Dimmable filter |
| CN103293698A (en) * | 2011-04-07 | 2013-09-11 | 奥托莱克斯公司 | Grating-based tunable filter |
| CN203705684U (en) * | 2013-12-20 | 2014-07-09 | 福州百讯光电有限公司 | Comb filter adopting beam-expanding optical fiber collimators |
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| CN1161582A (en) * | 1995-12-29 | 1997-10-08 | 康宁股份有限公司 | Bandwidth-adjusted wavelength demultiplexer |
| EP0984311A2 (en) * | 1998-09-01 | 2000-03-08 | Jds Fitel Inc. | Optical multiplexor/demultiplexor |
| US20020102057A1 (en) * | 2001-02-01 | 2002-08-01 | Chaoyu Yue | All fiber dwdm multiplexer and demultiplexer |
| CN103293698A (en) * | 2011-04-07 | 2013-09-11 | 奥托莱克斯公司 | Grating-based tunable filter |
| CN103018837A (en) * | 2011-09-28 | 2013-04-03 | 福州高意光学有限公司 | Dimmable filter |
| CN102608708A (en) * | 2012-03-05 | 2012-07-25 | 华中科技大学 | Wavelength-adjustable optical filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111694103A (en) * | 2020-06-30 | 2020-09-22 | 昂纳信息技术（深圳）有限公司 | Design method of optical filter |
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