CN1349318A - Narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response - Google Patents
Narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response Download PDFInfo
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- CN1349318A CN1349318A CN01134575A CN01134575A CN1349318A CN 1349318 A CN1349318 A CN 1349318A CN 01134575 A CN01134575 A CN 01134575A CN 01134575 A CN01134575 A CN 01134575A CN 1349318 A CN1349318 A CN 1349318A
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Abstract
The invention relates to optical communication technology, particularly to a tunable optical filter with flattop and steep edge spectral response. The input and output ends are formed by a couple of self-focusing lens, a parallel multicavity structure is between then, two walls of the cavities are fit reflecting film, at least one of the parallel multicavities is air cavity which interval is adjustable. Three parallel cavity structure is selected according to the invention, buth sides are dielectric cavity, the center is air cavity. The narrow-band tunable filter with flattop and steep edge response used in said invention can overcome the defect that band width of peaky slowly reduced peak in traditional filter is not narrow enough and tuning function is poor. It can be used to not only optical communication field but also optical measurement and quantiative analysis field as a tunable filter.
Description
Technical field
The present invention relates to optical communication technique, particularly a kind of adjustable light wave-filter in the optical communication technique with flat-top and steep-edge frequency response.
Background technology
Adopt light WDM technology can realize making full use of of the network bandwidth in optical fiber telecommunications system, the Optical Add Drop Multiplexer technology has realized protect networks, the function that wavelength route or the like is many.Tunable optic filter is realized a core key technology of above two kinds of technology just.Common filter is difficult to satisfy simultaneously the requirement of continuously adjustable and narrow wavelength response bandwidth.
In optical WDM communication system, for selection and the exchange that realizes wavelength, the optical filter spare core devices that is absolutely necessary.In the practical application there being much the method for optically filtering, as adopts traditional F-P cavity configuration, and dielectric film filter and fiber grating or the like can satisfy the bandwidth requirement of present wavelength-division multiplex system, and obtained using widely.
But these traditional optical filter spares still exist certain defective, especially today of the develop rapidly of close wavelength-division multiplex technology and light switching technology, optical filter have been proposed to upgrade and higher requirement.Close wavelength-division multiplex technology requires the bandwidth narrower (suggestion according to ITU-T requires bandwidth granularity to should be 0.4nm) of optical filter, and having only response curve is that the structure on the steep limit of flat-top could be held more channel capacity under the bandwidth that equates.In order to satisfy optical wavelength exchange flexibly, the demand of dynamic tunable optic filter becomes more urgent, and traditional filter obviously can not satisfy such requirement.
Summary of the invention
The purpose of this invention is to provide a kind of tunable optic filter with the response of the steep limit of flat-top narrow band spectrum, have the tunable optic filter of flat-top and steep limit narrowband response, filter can satisfy the requirement of continuously adjustable and narrow wavelength response bandwidth simultaneously.
The invention is characterized in: input and output are made of a pair of GRIN Lens, are provided with multi-cavity structure therebetween, and multi-cavity structure is parallel multi-cavity structure; Chamber two walls are equipped with reflectance coating; At least one is air chamber for parallel multi-cavity, and the spacing of air chamber is adjustable; Being provided with mechanical adjustment structure connection is located on the structure of air chamber both sides; Be provided with a diaphragm between air chamber, GRIN Lens is to plate a skim on the plane; The present invention's preferred three parallel cavity configurations, wherein both sides are dielectric cavity, the centre is an air chamber.
The present invention realizes continuous tuning by tuning air chamber, has simplified the complexity of tuning realization and has kept the advantage of multi-cavity structure.The present invention with the advantage that traditional F-P chamber (Fabry-Paro chamber) humorous filter of Adjustable structure is compared is: the response curve that adopts the tunable optic filter of structure of the present invention is the steep limit of arrowband flat-top, this will help to reduce crosstalking of interchannel, can also realize continuous tuning in the larger context; Owing to processing on this maturation process by plated film on the GRIN Lens, so be very favorable to reducing device cost; In addition, utilize the collimation property of GRIN Lens, light beam is collimated, the diffraction loss in chamber can reduce greatly, thereby can make the expanded range of resonant cavity.Through below with reference to the description of accompanying drawing to the embodiment as example of the present invention, above-mentioned and other advantage of the present invention and characteristics will be more readily apparent from.
Description of drawings
Fig. 1 represents the structural representation of the tunable optic filter of one embodiment of the present of invention.
1 ... monofilm optical fiber 2 ... reflectance coating
3 ... reflectance coating 4 ... reflectance coating
5 ... reflectance coating 6 ... the chamber
7 ... chamber 8 ... diaphragm
9 ... GRIN Lens 10 ... GRIN Lens
11 ... the mechanical adjustment structure
Specific implementation
This tuned filter is based on GRIN Lens, and the light of outgoing collimates in 9 pairs of optical fiber of GRIN Lens, and 10 pairs of filtered optical convergences of GRIN Lens are in outgoing optical fiber.Whole system has four reflectance coatings 2,3,4,5, and reflectance coating 2,3,4,5 dielectric materials are the multilayer dielectric films by the reflectivity designing requirement.We call the chamber to folded space between two adjacent reflectance coatings, and each reflectance coating is distributed on the wall of chamber, as shown in the figure this filter have three chambeies be respectively 6,7 and film 3,4 between air chamber.Packing material in the chamber 6,7 has multiple choices, as silicon dioxide etc.
Two adjacent reflectance coatings are parallel to each other, and it is the Fabry-Paro chamber of medium with the packing material that reflectance coating 2,3 and folded therebetween chamber 6 constitute one, is called for short the F-P chamber.Reflectance coating 4,5 and folded therebetween 7 another F-P chambeies of formation, chamber.Constituted another F-P chamber between the film 3,4, the spacing in this F-P chamber can change by mechanical structure.Being provided with mechanical adjustment structure connection is located on the structure of air chamber both sides, the spacing of air chamber is regulated in the adjustment of mechanical structure, incident light perpendicular to device surface incident enters filter behind GRIN Lens 9 collimations, carry out carrying out the second time and wavelength selection for the third time through air chamber and chamber 7 again after wavelength is selected through chamber 6.Like this, near the light wave the resonance wavelength certain limit of chamber 6,7 and air chamber can be in three chambeies and reflectance coating 1,3 between resonance repeatedly.The result of coupling may make in chamber 6,7 and air chamber repeatedly according to the difference of the reflectivity separately of four reflectance coatings 2,3,4,5 that the resonance intensity of each wavelength of resonance changes between chamber 4 and the chamber 5.When suitably choosing separately reflectivity of four reflectance coatings 2,3,4,5, resonance intensity will have the linear of the steep limit of flat-top with the wavelength change relation, be provided with a relative diaphragm 8 between air chamber, diaphragm 8 makes light more become middle and removes part edge stray light signal.
The humorous filter of single intonation reaches tuning purpose by unique chamber (air chamber) in the middle of only changing.Draw by analysis, first: reflectivity distributes must be away from the reflectivity matching area, could realize tuning, otherwise there is not the continuous tuning ability, so using the single tuned filter response curve is that Lorenz is linear. second: reflectivity distributes and still takes symmetrical structure, the big more then 3db of inner two-layer reflectivity bandwidth is narrow more, after the two-layer reflectivity in inside is determined, outer field reflectivity increases the 3db bandwidth and also narrows down, but tuning capability is restricted, when the spacing of continuous tuning chamber, " peak value " unstable phenomenon that promptly is similar to gain fluctuation appears, and what design need be examined rate is how to guarantee when reducing the 3db bandwidth that gain fluctuation is in controllable scope.For reducing technology difficulty, selecting inner two-layer reflectivity is 0.98.Outer reflectivity is respectively 0.25,0.4,0.6 the time continuous tuning the time, the design Free Spectral Range is the 32nm of ITU standard definition, (1528.77nm--1560.61nm) Dui Ying 3db bandwidth is about 0.2nm respectively, 0.06nm, 0.028nm, the 10-2db bandwidth is about 0.8nm, 0.5nm, can obtain better narrow-band filtering effect (present coating technique can be realized 99.6% reflectivity, and the raising of reflectivity from 98% to 99.6% is fairly obvious for the performance improvement of filter) 0.3nm. in fact corresponding rete reflectivity can also be improved further simultaneously.Therefore this new device can satisfy the requirement of the current optical wavelength-division multiplex communication technology to the semiconductor light-detecting device better.
In sum, the present invention is by simple structural design, make the present invention that a kind of narrow-band tunable filter with flat-top and sharp-edge responses can be provided, thereby overcome the slow response peak of falling in conventional filter pinnacle, the shortcoming of the narrow inadequately and tunable performance difference of bandwidth, make the present invention can better application in wavelength division multiplexing and optical switching system.Not only can be applicable to optical communication field as tunable optic filter the present invention, can also be used for optical measurement, the field that spectrum analysis etc. are numerous.Tunable optic filter method by plated film on a pair of GRIN Lens forms a plurality of optics cavity.The reflectivity of careful design rete and the length of a plurality of optics cavity spacings are to realize the resonance of a certain centre wavelength is reached the effect of filtering.Just can realize the effect of Continuous Selection centre wavelength by the length that changes the middle air chamber of a pair of GRIN Lens.The above is instantiation of the present invention and the know-why used, comply with the equivalent transformation that conception of the present invention is done, when the function that it produced does not exceed spiritual that specification and accompanying drawing contain yet, as four mirror three-cavity structures among the embodiment being expanded to parallel many mirrors multi-cavity structures such as five mirrors, four chambeies, and for example four mirrors, the three chamber symmetrical structures in the present embodiment are changed to the unsymmetric structure of many mirrors multi-cavity, all should be within the scope of the invention.Device architecture proposed by the invention not only can be applied to can also be applied to the structure at fiber end face on the GRIN Lens, and these application also all should be within the scope of the invention, explanation hereby.
Claims (10)
1, a kind of narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response is characterized in that input and output are made of a pair of GRIN Lens, are provided with multi-cavity structure therebetween.
2, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 1 is characterized in that multi-cavity structure is parallel multi-cavity structure.
3, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 1 is characterized in that chamber two walls are equipped with reflectance coating.
4, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 1 and 2, at least one is an air chamber to it is characterized in that parallel multi-cavity.
5, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 4, the spacing that it is characterized in that air chamber is adjustable.
6, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 5 is characterized in that being provided with mechanical adjustment structure connection and is located on the structure of air chamber both sides.
7, according to claim 4,5 or 6 described narrow-band tunable filters, it is characterized in that between air chamber, being provided with a diaphragm with multi-cavity structure of flat-top and steep-edge frequency response.
8, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 1 is characterized in that GRIN Lens is to plate a skim on the plane.
9, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 1 and 2 is characterized in that preferred three parallel cavity configurations, and wherein both sides are dielectric cavity, and the centre is an air chamber.
10, the narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response according to claim 3 is characterized in that two adjacent reflectance coatings are parallel to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01134575A CN1349318A (en) | 2001-11-28 | 2001-11-28 | Narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response |
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| Application Number | Priority Date | Filing Date | Title |
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| CN01134575A CN1349318A (en) | 2001-11-28 | 2001-11-28 | Narrow-band tunable filter with multi-cavity structure of flat-top and steep-edge frequency response |
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| CN1349318A true CN1349318A (en) | 2002-05-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808454A (en) * | 2017-11-22 | 2019-05-28 | 保时捷股份公司 | The component of at least one technical parts in cavity in vehicle interior |
| CN110764174A (en) * | 2019-10-28 | 2020-02-07 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
-
2001
- 2001-11-28 CN CN01134575A patent/CN1349318A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109808454A (en) * | 2017-11-22 | 2019-05-28 | 保时捷股份公司 | The component of at least one technical parts in cavity in vehicle interior |
| CN109808454B (en) * | 2017-11-22 | 2022-06-03 | 保时捷股份公司 | Assembly of at least one technical component in a cavity in the interior of a motor vehicle |
| CN110764174A (en) * | 2019-10-28 | 2020-02-07 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
| CN110764174B (en) * | 2019-10-28 | 2022-05-03 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
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