CN101968577A - Planar integrated photonics based optical tunable filter and tuning method thereof - Google Patents
Planar integrated photonics based optical tunable filter and tuning method thereof Download PDFInfo
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- CN101968577A CN101968577A CN 201010284961 CN201010284961A CN101968577A CN 101968577 A CN101968577 A CN 101968577A CN 201010284961 CN201010284961 CN 201010284961 CN 201010284961 A CN201010284961 A CN 201010284961A CN 101968577 A CN101968577 A CN 101968577A
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Abstract
The invention relates to an optical filtering technology and provides a novel planar integrated photonics based optical tunable filter aiming at the defects of the optical fibers in the traditional technology. The technical scheme adopts the essentials that the planar integrated photonics based optical tunable filter sequentially comprises an isolator, a first lens, a polarizer, a wideband semi-reflecting and semi-transmitting dielectric film filter, a second lens and an optical waveguide along a light path, wherein the wideband semi-reflecting and semi-transmitting dielectric film filter is placed at an angle of 45 degrees, and a third lens and an optical detector are sequentially arranged right below the wideband semi-reflecting and semi-transmitting dielectric film filter; the optical detector is connected with a detector receiving device; and the detector receiving device is connected with a display device. In addition, the invention also discloses a method for applying the filter to tuning the reflecting wavelengths of gratings. In the invention, two gratings with different Bragg reflecting wavelengths are connected in series, thus the invention has the advantages of wide tuning range, no mechanical movable part, good stability and low power consumption and is suitable for optical filtering.
Description
Technical field
The present invention relates to optical filtering technology, relate to a kind of specifically based on the optics adjustable filter of the integrated photonics in plane and the method that adopts this filter tuner optical grating reflection wavelength.
Background technology
The optics adjustable filter is a kind of important optical device, it is indispensable optical component in optical communication DWDM (dense wave division multipurpose) signal transmission system, this device can be implemented in the going up of light signal of communication node in the full optical communication net and download, and carries out the scheduling of effective light signal.This device also has a large amount of application in sensor-based system, it is the core devices of demodulation part in optical fiber sensing system, and himself also can be used as spectrometer and uses.Present optical scanning wave filter based on different technologies, as: Fabry-Perot (F-P) chamber technology, all there are defective in various degree in acoustooptic technique and thin film technique and free space grating technology.For example: the line width broad of higher and its wave filter of acoustooptic technique cost, generally more than 2nm, for some application, as the optical communication field, its live width can not reach the index request of optical communication.And utilize wave filter that thin film technique (characteristic that the filtering centre wavelength that refers to utilize bandpass filter is offset with the variation of the incident angle of light) makes owing to need rotate wave filter when tuning, therefore, there is mechanical movable part in it, need motor to rotate film filter to obtain corresponding wavelength signals, the precision of the long-term rotation effect of attrition wave filter of motor is the life-span extremely, for the device of long-term monitor optical communication network, its life-span is the problem that pay attention to.There is mechanical movable part equally in grating technology, though the bandwidth of its filtering can be done narrowlyer, equally also exists and the same problem of thin film technique, i.e. life-span and the precision problem that is caused by mechanical movable part.The F-P wave filter has the defective of self, because the fineness in F-P chamber is limited, so the bandwidth of wave filter can only accomplish nanometer scale, can not satisfy the application in optical communication field.
Summary of the invention
Technical matters to be solved by this invention is: at the defective that the optical filter in the conventional art exists, propose a kind of novel based on the optics adjustable filter of the integrated photonics in plane and the method that adopts this filter tuner optical grating reflection wavelength.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: based on the optics adjustable filter of the integrated photonics in plane, comprise isolator, first lens, the polarizer, broadband half-reflection and half-transmission deielectric-coating wave filter, second lens, optical waveguide successively along light path, described broadband half-reflection and half-transmission deielectric-coating wave filter and incident ray are 45 and place, set gradually the 3rd lens, photo-detector under the half-reflection and half-transmission deielectric-coating wave filter of broadband, described photo-detector connects the detector receiving trap, the detector receiving trap connects display device.
Further, described optical waveguide comprises the grating of two different bragg reflection wavelength of connecting mutually and have.
Further, this optics adjustable filter also comprises the logical deielectric-coating wave filter of the band that is arranged between the broadband half-reflection and half-transmission deielectric-coating wave filter and second lens.
Further, this optics adjustable filter also comprises heating controller, shown in heating controller the grating on the optical waveguide is heated.
Further, described heating controller comprises temperature-detecting device and two electric heaters, the corresponding grating of each electric heater.
Further, described electric heater adopts the mode of evaporation metal electrode around grating to make.
Further, described polarizer adopts C-polarizer.
Based on the tuning methods of the optics adjustable filter of the integrated photonics in plane, vary with temperature for refractive index and to be respectively greater than the minus two class different materials of zero-sum, promptly refractive index varies with temperature that coefficient is just existing for or be negative two kinds of situations.Its tuning methods is also different, existing narration respectively.May further comprise the steps:
A. at normal temperatures, refractive index varies with temperature coefficient when negative at once, the family curve of the logical deielectric-coating wave filter of accommodation zone makes first grating reflection wavelength X 1 be positioned at characteristic centre position, and second grating reflection wavelength X 2 is positioned at characteristic long wave cut-off function end; At first heat first grating, make this raster scanning, be scanned up to characteristic low-frequency cutoff position λ s, continue heating, make its reflection wavelength rest on λ s by λ 1; Heat second grating then, make its reflection wavelength move to λ 1, finish a tuning circulation by λ 2.
B. at normal temperatures, when refractive index varies with temperature coefficient is timing, the family curve of the logical deielectric-coating wave filter of accommodation zone makes first grating reflection wavelength X 1 be positioned at characteristic shortwave by end, and second grating reflection wavelength X 2 is positioned at characteristic center; At first heat second grating, make this raster scanning, be scanned up to long wave cut-off function end λ L, continue heating, make its reflection wavelength rest on λ L by λ 2; Heat first grating then, make its reflection wavelength move to λ 2, finish a tuning circulation by λ 1.
The invention has the beneficial effects as follows: adopt the grating series connection of two different bragg reflection wavelength to use, tuning range is wide, there is not mechanical movable part, good stability, because fiber waveguide device can use semiconductor technology to make, its volume is little, and thermal capacity is little, less heating power can be finished wavelength tuning, so its power consumption is little.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram of the optics adjustable filter among the embodiment;
Fig. 2 is logical deielectric-coating wave filter spectrum of the band of dn/dT＜0 o'clock and optical grating reflection spectrum;
Fig. 3 is logical deielectric-coating wave filter spectrum of the band of dn/dT＞0 o'clock and optical grating reflection spectrum.
Among Fig. 1,10 is optical fiber, and 20 is first lens, 30 is isolator, and 50 is C-Polarizer, and 60 is the 3rd lens, 70 is display device, 80 is photo-detector, and 90 is the detector receiving trap, and 100 is broadband half-reflection and half-transmission deielectric-coating wave filter, 130 is second lens, 200 is optical waveguide, and 300 is heating controller, and 500 are the logical deielectric-coating wave filter of band.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The present invention is directed to the defective that the optical filter in the conventional art exists, propose a kind of novel based on the optics adjustable filter of the integrated photonics in plane and the method that adopts this filter tuner optical grating reflection wavelength.This filter tunable wide ranges, power consumption is little and do not exist mechanical movable part, stability high.The present invention is based on the principle of the bragg reflection wavelength variations that the grating on the optical waveguide takes place under heat modulation, the optics adjustable filter of making in conjunction with the Free Space Optics device.
Photoetching Bragg grating on planar optical waveguide, the evaporation metal electrode makes it to become electric heater around grating.Use electric heater to add thermal grating, its refractive index will change, and change of refractive will cause moving of its reflection wavelength, the principle of the adjustable filtering of optics that Here it is.In order to enlarge tuning range, the present invention has used two gratings with different bragg reflection wavelength, and series connection is used.Each grating pair is answered an electric heater, and each grating can be finished a part of range of adjustment like this, and two gratings are together in series range of adjustment to be expanded and are twice, and realize that optical wavelength in a big way is tuning.
Because two gratings have different reflection wavelengths, in order to address this problem, we add a logical deielectric-coating wave filter of band before optical waveguide, by regulating its family curve, making at a time has only a grating reflection wavelength to pass through wave filter, and another grating reflection wavelength moves on to outside the family curve of the logical deielectric-coating wave filter of band by the modulator approach of heating, thereby realizes the single wavelength reflection.The reflection wavelength of Bragg grating is followed formula:
λB＝2Neff*Λ；
ΔNeff≈(dn/dT)*ΔT
Wherein, Neff represents effective refractive index, and Λ represents lattice constant, and dn/dT represents that refractive index varies with temperature coefficient.λ B is the bragg wavelength of reflection grating, and Δ T represents to heat the temperature variation that is caused.
Can from formula, find out, the bragg reflection wavelength changes with effective refractive index Neff and lattice constant Λ, but the variation of lattice constant is wanted little two to three orders of magnitude of going up usually compared with the variation of effective refractive index Neff, and variation and the temperature variation of effective refractive index Neff are closely related, so the present invention has utilized this characteristic to finish wavelength tuning just.
Embodiment:
As shown in Figure 1, optics adjustable filter in this example based on the integrated photonics in plane, comprise isolator 30, first lens 20, polarizer, broadband half-reflection and half-transmission deielectric-coating wave filter 100, second lens 130, optical waveguide 200 successively along light path, described broadband half-reflection and half-transmission deielectric-coating wave filter 100 is 45 with incident ray and places, set gradually the 3rd lens 60, photo-detector 80 under broadband half-reflection and half-transmission deielectric-coating wave filter 100, described photo-detector 80 connects detector receiving trap 90, detector receiving trap 90 connects display device 70.Described optical waveguide 200 comprises the grating (not shown) of two different bragg reflection wavelength of connecting mutually and have.The heating controller 300 that this optics adjustable filter also comprises the logical deielectric-coating wave filter 500 of the band that is arranged between the broadband half-reflection and half-transmission deielectric-coating wave filter 100 and second lens 130 and is used for the grating on the optical waveguide 200 is heated.Polarizer adopts C-polarizer 50, and heating controller 300 comprises temperature-detecting device and two electric heaters, the corresponding grating of each electric heater.
Its principle of work is: measured signal is collimated by first lens 20 behind isolator 30 by optical fiber 10 inputs.The polarization state of this light beam is at random, for making it have single polarization state, after collimated ray, by an optical polarization device C-polarizer50, this device is converted into the light that the identical polarization state of two bundles of a slight distance is spatially arranged, i.e. TE pattern with random polarization light.Behind the broadband half-reflection and half-transmission deielectric-coating wave filter 100 of emergent light via the 45 placement, via the logical deielectric-coating wave filter 500 of band, the wave band that needs to measure is passed through again, the light at the measurement wave band does not reflect away through a low-angle as veiling glare.Light via logical deielectric-coating wave filter 500 outgoing of band is coupled into the optical waveguide 200 that has two gratings by second lens 130.
The reflection wavelength at normal temperatures of supposing first grating and second grating is respectively λ 1, λ 2, when dn/dT＜0, be that refractive index varies with temperature coefficient when negative, the family curve of the logical deielectric-coating wave filter 500 of accommodation zone, make first grating reflection wavelength X 1 be positioned at characteristic centre position, second grating reflection wavelength X 2 is positioned at characteristic long wave cut-off function end, referring to Fig. 2; At first heat first grating, make this raster scanning, be scanned up to characteristic low-frequency cutoff position λ s, continue heating, make its reflection wavelength rest on λ s by λ 1; Heat second grating then, make its reflection wavelength move to λ 1, finish a tuning circulation by λ 2; When dn/dT＞0, be that to vary with temperature coefficient be timing to refractive index, the family curve of the logical deielectric-coating wave filter 500 of accommodation zone makes first grating reflection wavelength X 1 be positioned at characteristic shortwave by end, and second grating reflection wavelength X 2 is positioned at characteristic center; At first heat second grating, make this raster scanning, be scanned up to long wave cut-off function end λ L, continue heating, make its reflection wavelength rest on λ L by λ 2; Heat first grating then, make its reflection wavelength move to λ 2, finish a tuning circulation by λ 1.
Like this, in whole tuning process,, guarantee to have only all the time a wavelength reflection for the incident of wideband light source.Therefore, by heating respectively and temperature control, thereby finished from the wavelength tuning process of λ 1 to λ 2 to grating.The former road of light signal by optical waveguide 200 reflections is returned, focus on via the 3rd lens 60 through second lens 130, the logical deielectric-coating wave filter 500 of band, 100 reflections of broadband half-reflection and half-transmission deielectric-coating wave filter, optical signals photo-detector 80 after the focusing detects, and be detected device receiving trap 90 and receive, send into display device 70 then, provide raw data and drawing, finish wavelength and show.
Claims (8)
1. based on the optics adjustable filter of the integrated photonics in plane, it is characterized in that: comprise isolator, first lens, polarizer, broadband half-reflection and half-transmission deielectric-coating wave filter, second lens, optical waveguide successively along light path, described broadband half-reflection and half-transmission deielectric-coating wave filter and incident ray are 45 and place, set gradually the 3rd lens, photo-detector under the half-reflection and half-transmission deielectric-coating wave filter of broadband, described photo-detector connects the detector receiving trap, the detector receiving trap connects display device.
2. the optics adjustable filter based on the integrated photonics in plane as claimed in claim 1 is characterized in that: described optical waveguide comprises the grating of two different bragg reflection wavelength of connecting mutually and have.
3. the optics adjustable filter based on the integrated photonics in plane as claimed in claim 2 is characterized in that: this optics adjustable filter also comprises the logical deielectric-coating wave filter of the band that is arranged between the broadband half-reflection and half-transmission deielectric-coating wave filter and second lens.
4. the optics adjustable filter based on the integrated photonics in plane as claimed in claim 3 is characterized in that: this optics adjustable filter also comprises heating controller, shown in heating controller the grating on the optical waveguide is heated.
5. the optics adjustable filter based on the integrated photonics in plane as claimed in claim 4 is characterized in that: described heating controller comprises temperature-detecting device and two electric heaters, the corresponding grating of each electric heater.
6. the optics adjustable filter based on the integrated photonics in plane as claimed in claim 5 is characterized in that: described electric heater adopts the mode of evaporation metal electrode around grating to make.
7. as any described optics adjustable filter based on the integrated photonics in plane of claim 1 to 6, it is characterized in that: described polarizer adopts C-polarizer.
8. based on the tuning methods of the optics adjustable filter of the integrated photonics in plane, it is characterized in that: may further comprise the steps:
A. at normal temperatures, when refractive index varies with temperature coefficient when negative, the family curve of the logical deielectric-coating wave filter of accommodation zone makes first grating reflection wavelength X 1 be positioned at characteristic centre position, and second grating reflection wavelength X 2 is positioned at characteristic long wave cut-off function end; At first heat first grating, make this raster scanning, be scanned up to characteristic low-frequency cutoff position λ s, continue heating, make its reflection wavelength rest on λ s by λ 1; Heat second grating then, make its reflection wavelength move to λ 1, finish a tuning circulation by λ 2;
B. at normal temperatures, when refractive index varies with temperature coefficient is timing, the family curve of the logical deielectric-coating wave filter of accommodation zone makes first grating reflection wavelength X 1 be positioned at characteristic shortwave by end, and second grating reflection wavelength X 2 is positioned at characteristic center; At first heat second grating, make this raster scanning, be scanned up to long wave cut-off function end λ L, continue heating, make its reflection wavelength rest on λ L by λ 2; Heat first grating then, make its reflection wavelength move to λ 2, finish a tuning circulation by λ 1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256100A (en) * | 2011-07-19 | 2011-11-23 | 中国科学技术大学 | Two-way imaging-display system based on micro lens array and panel display integration |
| CN104297921A (en) * | 2014-11-14 | 2015-01-21 | 珠海保税区光联通讯技术有限公司 | Optical adjustable filter |
| CN104395797A (en) * | 2012-06-15 | 2015-03-04 | 美光科技公司 | Methods and apparatus providing thermal isolation of photonic devices |
| WO2019000969A1 (en) * | 2017-06-30 | 2019-01-03 | 华中科技大学 | Time-division multiplexing closed-loop feedback thermal control method and system |
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| US20080080804A1 (en) * | 2006-09-29 | 2008-04-03 | Electronics And Telecommunications Research Institute | Tunable waveguide bragg grating device |
| CN100451703C (en) * | 2006-12-18 | 2009-01-14 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN101393304A (en) * | 2008-11-12 | 2009-03-25 | 北京交通大学 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
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2010
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Patent Citations (3)
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| US20080080804A1 (en) * | 2006-09-29 | 2008-04-03 | Electronics And Telecommunications Research Institute | Tunable waveguide bragg grating device |
| CN100451703C (en) * | 2006-12-18 | 2009-01-14 | 武汉光迅科技股份有限公司 | Tri-port depolarizing tunable optical filter based on TFF |
| CN101393304A (en) * | 2008-11-12 | 2009-03-25 | 北京交通大学 | Microwave photon filter based on chirp optical fiber grating and doping active optical fiber |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256100A (en) * | 2011-07-19 | 2011-11-23 | 中国科学技术大学 | Two-way imaging-display system based on micro lens array and panel display integration |
| CN102256100B (en) * | 2011-07-19 | 2013-02-13 | 中国科学技术大学 | Two-way imaging-display system based on micro lens array and panel display integration |
| CN104395797A (en) * | 2012-06-15 | 2015-03-04 | 美光科技公司 | Methods and apparatus providing thermal isolation of photonic devices |
| CN104395797B (en) * | 2012-06-15 | 2018-08-24 | 美光科技公司 | The method and apparatus of PHOTONIC DEVICE being thermally isolated is provided |
| US10090451B2 (en) | 2012-06-15 | 2018-10-02 | Micron Technology, Inc. | Methods and apparatus providing thermal isolation of photonic devices |
| US10777722B2 (en) | 2012-06-15 | 2020-09-15 | Micron Technology, Inc. | Methods and apparatus providing thermal isolation of photonic devices |
| US11217737B2 (en) | 2012-06-15 | 2022-01-04 | Micron Technology, Inc. | Methods and apparatus providing thermal isolation of photonic devices |
| CN104297921A (en) * | 2014-11-14 | 2015-01-21 | 珠海保税区光联通讯技术有限公司 | Optical adjustable filter |
| WO2019000969A1 (en) * | 2017-06-30 | 2019-01-03 | 华中科技大学 | Time-division multiplexing closed-loop feedback thermal control method and system |
| US10852483B2 (en) | 2017-06-30 | 2020-12-01 | Huazhong University Of Science And Technology | Time division multiplexing closed loop feedback thermal control method and system |
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| CN101968577B (en) | 2012-09-05 |
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