CN105807449A - Tunable optical filter - Google Patents
Tunable optical filter Download PDFInfo
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- CN105807449A CN105807449A CN201410839299.XA CN201410839299A CN105807449A CN 105807449 A CN105807449 A CN 105807449A CN 201410839299 A CN201410839299 A CN 201410839299A CN 105807449 A CN105807449 A CN 105807449A
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Abstract
The invention discloses a tunable optical filter. The tunable optical filter is characterized by comprising N periodic filter bodies with adjustable wavelengths, N is larger than or equal to 2, and the N periodic filter bodies with adjustable wavelengths are not same in free spectrum range (FSR) and are sequentially cascaded through optical fibers. The tunable optical filter has the advantages that the tunable optical filter is simple in structure, convenient to produce, low in cost, good in performance and high in reliability, and meanwhile the machining difficulty of the periodic filter bodies and the control difficulty of a circuit control part can be effectively reduced.
Description
Technical field
The present invention relates to optical communication field, particularly relating to is the tunable optical filter of a kind of filtering for optical signal and detection.
Background technology
Tunable optical filter is a kind of important communidcation optics device, only allows specific wavelength signal transmission, and all the other wavelength signals reflect away or filter out.Adjustable light wave-filter may be used for the optical signal screening of different channels, plays more and more important effect as a kind of wavelength selecting device in light communication system.
Tunable optical filter can apply to such as wavelength division multiplex device, wavelength selector, the noise suppressed of image intensifer, dispersion compensator etc..By the combination of adjustable light wave-filter with optical property watch-dog OPM, optical add/drop multiplexer or optical cross-connect OXC, the function of all-optical network system can play completely.Existing adjustable light wave-filter mainly has: Mach-Zehnder interfere mode filter, based on the wave filter of grating, based on the wave filter in FP chamber, dielectric film mode filter and active light wave filter etc..The wave filter of existing tunable filter different core technical scheme is realizing on tunable performance, has respective advantage to there is also respective difficulty or technology or cost, or reliability etc..
Summary of the invention
For the deficiency of disclosed technical scheme, the tunable optical filter that the present invention proposes a kind of simple in construction, production technology is convenient, cost is low, performance good and reliability is high.
For reaching above-mentioned purpose, the technical scheme is that a kind of tunable optical filter, it is characterized in that: include the periodic filter of N number of Wavelength tunable, and N >=2, the Free Spectral Range (FSR) of the periodic filter of described N number of Wavelength tunable is unequal, and the periodic filter of described N number of Wavelength tunable is through optical fiber successively cascade.
Preferably, also including circuit control part, described circuit control part controls wavelength-selective switches and the periodic filter of N number of Wavelength tunable simultaneously.
Preferably, also including a wavelength-selective switches, described wavelength-selective switches is connected with circuit control device, and is located in the input path of periodic filter of first Wavelength tunable.
Further, the periodic filter of described Wavelength tunable is other optical element such as etalon element or fiber grating element.
Further, the periodic filter of described Wavelength tunable is thermo-sensitive material, and described circuit control part is thermal tuning mode；Or the periodic filter of described Wavelength tunable is electrooptical material, described circuit control part is electric tuning mode.
Further, described etalon element or fiber grating element are single chamber or multi-cavity structure.
Preferably, also including N number of high reflection mirror, described high reflection mirror is located on the emitting light path of the periodic filter of each Wavelength tunable, and emergent light is reflected back the periodic filter of this Wavelength tunable.
Preferably, described wavelength-selective switches includes relay, N number of filter plate, and described N number of filter plate is bonded on the connecting rod of relay, and described Control relay connecting rod moves, and then incident illumination is by one of them filter plate；Described wavelength-selective switches includes one 1 × N photoswitch, N number of filter plate, 21 × N photoswitch, described N number of filter plate is located between one 1 × N photoswitch and 21 × N photoswitch side by side, and is connected by optical fiber with one 1 × N photoswitch and 21 × N photoswitch respectively.
Adopt above-mentioned technological means, tunable optical filter of the present invention, have the beneficial effect that there is simple in construction, production technology is convenient, cost is low, performance good and reliability is high, can effectively reduce the difficulty of processing of periodic filter and the control difficulty of reduction circuit control part simultaneously.
Accompanying drawing explanation
Fig. 1 is tunable optical filter schematic diagram 1 of the present invention；
Fig. 2 is tunable optical filter schematic diagram 2 of the present invention；
Fig. 3 adopts etalon as the schematic diagram 3 of wave filter；
Fig. 4 is the filter curve schematic diagram of Fig. 3；
Fig. 5 is the schematic diagram increasing high reflection mirror；
Fig. 6 is etalon single and the contrast schematic diagram of double; two filter curve；
Fig. 7 adopts double-cavity etalon as the schematic diagram of wave filter；
Fig. 8 is the contrast schematic diagram of single chamber etalon and the filter curve of double-cavity etalon；
Fig. 9 is the schematic diagram that double-cavity etalon increases reflecting mirror；
Figure 10 is 2 single double-cavity etalon singles and repeatedly filtering and comparison schematic diagram；
Figure 11 is that Fig. 2 increases wavelength-selective switches schematic diagram；
Figure 12 is wavelength-selective switches filter curve schematic diagram；
Figure 13 Vernier effect post filtering curve and wavelength-selective switches filter curve schematic diagram 1；
Figure 14 is the final filter curve schematic diagram 1 of Figure 13；
Figure 15 is Vernier effect post filtering curve and wavelength-selective switches filter curve schematic diagram 2；
Figure 16 is the final filter curve schematic diagram 2 of Figure 15；
Figure 17 adds wavelength-selective switches tunable optical filter embodiment 1；
Figure 18 adds wavelength-selective switches tunable optical filter embodiment 2.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
nullAs shown in Figure 1，Tunable optical filter described in the utility model，Including circuit control part 2，The adjustable periodic filter 11 of first wave length of optical fiber cascade successively、The adjustable periodic filter 12 of second wave length，Incident illumination is through the adjustable periodic filter 11 of first wave length，The light transmission of specific wavelength is only had after filtering，Owing to the FSR of the adjustable periodic filter of first wave length 11 is different with the FSR of the adjustable periodic filter of second wave length 12，So the adjustable periodic filter of first wave length 11 and the adjustable periodic filter of second wave length 12 is adjacent through can not be simultaneously fully aligned in peak，The light passed through is again through after the adjustable periodic filter 12 of second wave length，Only could pass through at the light that two wave filter are the wavelength through peak simultaneously，The light of remainder will be filtered，Only one of which within the scope of application band is made to pass through peak，Thus realizing filter function.Fig. 1 is that the Vernier effect of two periodic filter is to realize filter function, it is also possible to be that the Vernier effect of 3 or multiple periodic filter element (as shown in Figure 2) is to realize filter function.
The periodic filter of Wavelength tunable can be thermo-sensitive material, it is also possible to be electrooptical material, or other special adjustable materials.If heat-sensitive material, then circuit control part is thermal tuning mode, if electrooptical material, then circuit part is circuit control part is electric tuning mode, circuit control part controls periodic filter element simultaneously, the peak that passes through making all periodic filter element distances target wavelengths nearest is all adjusted to target peak position, thus realizing adjustable filter function.Employing etalon as shown in Figure 3 is as shown in the periodic filter of Wavelength tunable, first etalon the 301, second etalon 302 including cascade, its filter curve is as shown in Figure 4, wherein 401 is the filter curve of the first etalon 301,402 is the filter curve of the second etalon 302,403 is cascade filtering curve, only could pass through at the light that two wave filter are the wavelength through peak simultaneously, the light of remainder will be filtered, only one of which within the scope of application band is made to pass through peak, thus realizing filter function.
As shown in Figure 5, due to same etalon when identical incident angle through peak identical, a high reflection mirror 503,504 is increased on rear side of mark tool 501,502, make incident illumination come and go and realize secondary filtering by same etalon, improve isolation further and reduce the requirement to plated film index simultaneously, and when increasing cost hardly, as shown in Figure 6,601 is etalon single cascade curve, 602 come and go cascade curve for standard room, namely, under identical plated film index, mark tool comes and goes and can obtain higher isolation by etalon.
As shown in Figure 7, Fig. 3 mono-chamber mark tool is replaced by double-cavity etalon 701,702, owing to double-cavity etalon is possible not only to realize filter function, flat-top filter function can also be realized simultaneously, namely to compare the filter curve of single chamber mark tool more smooth at filter curve top, shown in the contrast schematic diagram of the filter curve of chamber as mono-in Fig. 8 etalon and double-cavity etalon, wherein 801 is the filter curve of two-chamber standard room 702,802 is the filter curve of two-chamber standard room 701,803 is the filter curve of single standard room, chamber 302, and 804 is the filter curve of single standard room, chamber 301.
As it is shown in figure 9, all increase a high reflection mirror 903,904 on rear side of double-cavity etalon 901,902, make incident illumination come and go and realize secondary filtering by same etalon, thus obtaining can meeting completely the filter curve of communication applications.As shown in Figure 10, wherein 1001 is that single chamber comes and goes cascade filtering curve, 1002 is single chamber cascade filtering curve, 1003 come and go cascade filtering curve for two-chamber, 1004 is two-chamber cascade filtering curve, it is known that 2 single double-cavity etalon singles and repeatedly filtering and comparison schematic diagram, under identical plated film index, two-chamber mark tool is come and gone and can be obtained the filtering isolation that entirely can meet communication applications, the bandwidth of flat-tope structure by etalon.
As shown in figure 11, peak is passed through in order to meet only one of which within the scope of whole service band, the needs of periodic filter element are accomplished very thin, difficulty of processing is very big, simultaneously because the electro-optic coefficient of the temperature coefficient of conventional thermal sense material or electrooptical material is limited, can regulate in whole wavelength band to meet, it is necessary to adjustment temperature range or voltage very big, to controlling, means suitable is significantly high.In order to solve these problems, filter apparatus of the present invention increases by a wavelength-selective switches 3 in incidence end, and incident illumination is after wavelength-selective switches 3, and lambda1-wavelength is divided into N section, each section of light output that all can obtain a narrower wavelength bandwidth.As shown in Figure 12 wavelength-selective switches filter curve, incident illumination can be divided into two sections shown in filter plate 1 curve 1201 and filter plate 2 curve 1202 by wavelength-selective switches.Filter whole to service band within the scope of can have two crest such as Figure 13 after Vernier effect, shown in 15, filter out one of them crest such as Figure 14 by wavelength-selective switches, shown in 16, thus realizing within the scope of whole service band only one of which through peak.Therefore the thickness of periodic filter can increase thus reducing difficulty of processing person's difficulty of processing of periodic filter sheet, simultaneously, owing to periodic filter sheet can segmented tuning, so also reduce temperature controlled scope or electric control scope, so the difficulty of circuit control part can also be substantially reduced.
Shown in Figure 17, the structure of wavelength-selective switches can for bond on relay 27 connecting rod 271 by multiple filter plate 1701-170n, switching relay 27 state, light can be selected to pass through from any one filter plate, thus realizing incident illumination wave band is divided into narrower two section, thus reducing processing and controlling difficulty, it is achieved filtering.This wavelength-selective switches can be a single element, it is also possible to as shown in Figure 18,1 × n select switch 1902,1 × n to select switch 1902, filter plate 1801-180n to form, realized identity function by cascade.
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; the various the changes in the form and details present invention made, are protection scope of the present invention.
Claims (8)
1. a tunable optical filter, it is characterized in that: include the periodic filter of N number of Wavelength tunable, and N >=2, the Free Spectral Range of the periodic filter of described N number of Wavelength tunable is unequal, and the periodic filter of described N number of Wavelength tunable is through optical fiber successively cascade.
2. a kind of tunable optical filter according to claim 1, it is characterised in that: also including a wavelength-selective switches, described wavelength-selective switches is located in the input path of the periodic filter of first Wavelength tunable.
3. a kind of tunable optical filter according to claim 2, it is characterised in that: also including circuit control part, described circuit control part controls wavelength-selective switches and the periodic filter of N number of Wavelength tunable simultaneously.
4. a kind of tunable optical filter according to claim 1, it is characterised in that: the periodic filter of described Wavelength tunable is etalon element or fiber grating element.
5. a kind of tunable optical filter according to claim 1, it is characterised in that: the periodic filter of described Wavelength tunable is thermo-sensitive material, and described circuit control part is thermal tuning mode；Or the periodic filter of described Wavelength tunable is electrooptical material, described circuit control part is electric tuning mode.
6. a kind of tunable optical filter according to claim 4, it is characterised in that: described etalon element or fiber grating element are single chamber or multi-cavity structure.
7. a kind of tunable optical filter according to claim 1, it is characterized in that: also include N number of high reflection mirror, described high reflection mirror is located on the emitting light path of the periodic filter of each Wavelength tunable, and emergent light is reflected back the periodic filter of this Wavelength tunable.
8. a kind of tunable optical filter according to claim 1, it is characterized in that: described wavelength-selective switches includes relay, N number of filter plate, described N number of filter plate is bonded on the connecting rod of relay, described Control relay connecting rod moves, and then incident illumination is by one of them filter plate；Described wavelength-selective switches includes one 1 × N photoswitch, N number of filter plate, 21 × N photoswitch, described N number of filter plate is located between one 1 × N photoswitch and 21 × N photoswitch side by side, and is connected by optical fiber with one 1 × N photoswitch and 21 × N photoswitch respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410839299.XA CN105807449A (en) | 2014-12-30 | 2014-12-30 | Tunable optical filter |
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| CN201410839299.XA CN105807449A (en) | 2014-12-30 | 2014-12-30 | Tunable optical filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732744A (en) * | 2018-05-07 | 2018-11-02 | 王念 | A kind of MEMS tunable optical filters |
| CN109752896A (en) * | 2019-03-28 | 2019-05-14 | 山西大学 | A kind of cascade etalon filtering system and method for OPO modeling |
| JP2021021747A (en) * | 2019-07-24 | 2021-02-18 | 日本電信電話株式会社 | Optical filter |
| CN113031162A (en) * | 2021-03-15 | 2021-06-25 | 中国科学院半导体研究所 | Optical filter |
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| US20030227687A1 (en) * | 2002-06-07 | 2003-12-11 | Sean Chang | Fabry-perot optical filter device |
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| CN101614879A (en) * | 2009-07-24 | 2009-12-30 | 北京工业大学 | Narrow-band optical filter |
| CN202171659U (en) * | 2011-08-24 | 2012-03-21 | 福州高意通讯有限公司 | Wavelength selector switch |
| CN102411245A (en) * | 2010-09-23 | 2012-04-11 | 奥兰若（北美）有限公司 | Tunable optical filters using cascaded etalons |
| CN202230245U (en) * | 2011-08-25 | 2012-05-23 | 福州高意通讯有限公司 | Tunable filter structure |
| CN102932065A (en) * | 2012-11-12 | 2013-02-13 | 武汉邮电科学研究院 | Multi-subchannel gain flat device and method |
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2014
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0293436A (en) * | 1988-09-29 | 1990-04-04 | Nec Corp | Wavelength selective space switch |
| US20030227687A1 (en) * | 2002-06-07 | 2003-12-11 | Sean Chang | Fabry-perot optical filter device |
| CN201194033Y (en) * | 2008-04-08 | 2009-02-11 | 珠海保税区光联通讯技术有限公司 | Narrow-band optical filter |
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| CN202171659U (en) * | 2011-08-24 | 2012-03-21 | 福州高意通讯有限公司 | Wavelength selector switch |
| CN202230245U (en) * | 2011-08-25 | 2012-05-23 | 福州高意通讯有限公司 | Tunable filter structure |
| CN102932065A (en) * | 2012-11-12 | 2013-02-13 | 武汉邮电科学研究院 | Multi-subchannel gain flat device and method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732744A (en) * | 2018-05-07 | 2018-11-02 | 王念 | A kind of MEMS tunable optical filters |
| CN109752896A (en) * | 2019-03-28 | 2019-05-14 | 山西大学 | A kind of cascade etalon filtering system and method for OPO modeling |
| JP2021021747A (en) * | 2019-07-24 | 2021-02-18 | 日本電信電話株式会社 | Optical filter |
| JP7190140B2 (en) | 2019-07-24 | 2022-12-15 | 日本電信電話株式会社 | optical filter |
| CN113031162A (en) * | 2021-03-15 | 2021-06-25 | 中国科学院半导体研究所 | Optical filter |
| CN113031162B (en) * | 2021-03-15 | 2022-08-05 | 中国科学院半导体研究所 | Optical filter |
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Application publication date: 20160727 |