CN101604048A - A kind of all-fiber filter based on thin-core fibers - Google Patents
A kind of all-fiber filter based on thin-core fibers Download PDFInfo
- Publication number
- CN101604048A CN101604048A CNA2009101007651A CN200910100765A CN101604048A CN 101604048 A CN101604048 A CN 101604048A CN A2009101007651 A CNA2009101007651 A CN A2009101007651A CN 200910100765 A CN200910100765 A CN 200910100765A CN 101604048 A CN101604048 A CN 101604048A
- Authority
- CN
- China
- Prior art keywords
- mode fiber
- mode
- fiber
- fibers
- thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The present invention relates to a kind of all-fiber filter based on thin-core fibers.Traditional fiber grating filter temperature stability is relatively poor, is not suitable for moving under extreme condition of work.The present invention includes enclosure, the single-mode fiber assembly passes the enclosure setting, and the two ends of single-mode fiber assembly are connected with ring flange respectively.Described single-mode fiber assembly comprises three section single-mould fibers of series connection, wherein the single-mode fiber at two ends adopts standard single-mode fiber, the interlude single-mode fiber adopts thin core single-mode fiber, the coaxial setting of three section single-mould fibers, the two ends of thin core single-mode fiber respectively with an end welding of two segment standard single-mode fibers.Wave filter of the present invention is made simple, has the good temperature stability and the response characteristic of variations in refractive index to external world.
Description
Technical field
The invention belongs to the optical fiber technology field, relate to a kind of all-fiber filter based on thin-core fibers.
Background technology
Optical fibre device is because advantages such as little, the light weight of volume, simple in structure, anti-electromagnetic interference (EMI) have obtained application widely in fields such as communication, sensings.Especially the wave filter of full fiber type, its performance direct relation is the transmission quality of Networks of Fiber Communications till now.Wherein, fiber grating is now at the wave filter of using the most ripe a kind of optical-fiber type, and it is divided into two kinds: a kind of be called Fiber Bragg Grating FBG (Fiber BraggGrating, FBG), it is a kind of reflection-type bandpass filter of arrowband; Another kind is called long period fiber grating, and (Long Period Fiber Grating, LPG), it is a kind of transmission-type rejection filter.Though these two kinds of wave filter structures are relatively simple, rejection ratio is also than higher, and temperature stability is not fine, especially long period fiber grating, more responsive to temperature, temperature-responsive is approximately 0.1~0.3nm/ ℃, and this has influenced it greatly as stability of filter.In addition, fiber grating will begin to degenerate in greater than 300 ℃ environment, does not therefore utilize it to move under extreme condition of work.
No matter the optical fibre device of non-optical grating construction is as wave filter or Application in Sensing, is better than grating class device on its thermal stability and the manufacture difficulty mostly, has attracted many scholars' sight in recent years in the world, becomes the focus of research.The direction of many researchs is exactly the design of optical fiber internal interference instrument, utilizes its interference pattern to realize the application of filtering or sensing detection.The design philosophy that this class device is general all is to utilize the special construction in the optical fiber to excite the higher order mode that transmits light, causes the light of different mode having different optical path differences later on through same fiber lengths.But some design proposal often has complicated step in manufacturing process, such as connecing a bit of multimode optical fiber, or utilizes means such as heating to make technology such as fiber end face place fibre core expansion, has all increased the manufacture difficulty of device; Some needs special material, and such as using some extraordinary doubly clad optical fibers, photonic crystal fiber etc., cost are quite high; Having is exactly the non-constant of physical strength of some structures again, such as draw awl to realize the structure that higher order mode excites by optical fiber, does not almost have practical value.
Summary of the invention
Purpose of the present invention just provides a kind of new mode filter based on different core diameter single-mode fused fiber splice structures, this wave filter utilizes the optical fiber core diameter mismatch at fused fiber splice place, cause that higher order mode excites, thereby the Mach-Zehnder interferometer in the optical fiber that forms, the spectrum of its transmission has good bandreject filtering characteristic.
The present invention includes enclosure, the single-mode fiber assembly passes the enclosure setting, and the two ends of single-mode fiber assembly are connected with ring flange respectively.Described single-mode fiber assembly comprises three section single-mould fibers of series connection, wherein the single-mode fiber at two ends adopts standard single-mode fiber (Corning SMF28, core diameter 6.06 μ m), the interlude single-mode fiber adopts thin core single-mode fiber (Nufern 460-HP, core diameter 3.30 μ m, cutoff wavelength 450nm), the coaxial setting of three section single-mould fibers, the two ends of thin core single-mode fiber respectively with an end welding of two segment standard single-mode fibers.
Principle of work of the present invention: light is single mode transport in first section single-mould fiber, only has the basic mode of sandwich layer transmission.Behind the one section thin-core fibers of light in the middle of importing into, because fibre core varies in size, cause light single mode transport again, the pattern of even a plurality of high-orders is excited out.Since different patterns when in optical fiber, transmitting effective refractive index be different, therefore, can have optical path difference when the light of different mode arrives another section single-mould fiber, will produce interference then, the form of Here it is Mach-Zehnder interferometer.Its interference pattern has promptly been represented the filtering characteristic of wave filter, and the rejection ratio of filtering and interference contrast are directly related.By being various patterns under the different core diameters radially to be distributed to simulate obtain: at first, the mode field diameter of the single-mode fiber basic mode of different core diameters is different, and this provides necessary condition for exciting of higher order mode.Secondly, the higher order mode of even does not have power transfer at sandwich layer.At last, optical fiber for thin core, the energy relative standard single-mode fiber of the sandwich layer part that odd order modes comprises is a lot of less, therefore, interior basic mode of sandwich layer and high-order mode energy are approaching when interfering, therefore interfere good contrast, because higher order mode covering energy loss is few, the insertion loss of this wave filter is also very little in addition.
Wave filter of the present invention is made very simple, need comprise a whole set of writing system of laser instrument unlike grating, only needs two kinds of single-mode fibers of a unjacketed optical fiber welder and different core diameters.The present invention utilizes the Mach-Zehnder interferometer in the optical fiber that the mutual welding of the optical fiber of different core diameters realizes, the interference pattern of the transmission-type of this interferometer presents low Insertion Loss, high rejection ratio (>30dB) filtering characteristic.Relate generally to the manufacturing technology of this wave filter, good temperature stability and the response characteristic of variations in refractive index to external world.
Description of drawings
Fig. 1 is the structural representation of median filter of the present invention;
Fig. 2 is the filter transmission spectrum;
Fig. 3 is that wave filter is to the temperature-responsive spectral line;
Fig. 4 is a wave filter refractive index response spectral line to external world.
Embodiment
As shown in Figure 1, the thin-core fibers wave filter comprises enclosure 3, and the single-mode fiber assembly passes enclosure 3 and is provided with, and the two ends of single-mode fiber assembly are connected with ring flange 1 respectively.Described single-mode fiber assembly comprises three section single-mould fibers of series connection, wherein the single-mode fiber at two ends adopts standard single-mode fiber 2 (Corning SMF28, core diameter 6.06 μ m), the interlude single-mode fiber adopts thin core single-mode fiber 4 (Nufern 460-HP, core diameter 3.30 μ m, cutoff wavelength 450nm), the coaxial setting of three section single-mould fibers, the two ends of thin core single-mode fiber 4 respectively with an end welding of two segment standard single-mode fibers 2.This wave filter links to each other with spectrometer with wideband light source respectively with other wire jumpers prolongations by ring flange, and it is exactly that light source light spectrum is through the filtered transmission spectrum of wave filter that spectrometer obtains.
Because transmission length different in thin-core fibers can be brought different interference patterns, this wave filter is in the process of making, inserted three sections thin-core fibers of different length respectively, seen Fig. 2, wherein (a) is for inserting 2cm, (b) for inserting 4cm, (c) for inserting 6cm.The length of thin core single-mode fiber and the number of the stopband in the special spectrum scope are directly proportional, and also have influence on the bandwidth of stopband simultaneously, and thin-core fibers is long more, and the bandwidth of rejection of same wavelength location is more little.The length that this design only needs to change thin-core fibers changes bandwidth.The thin-core fibers structure of different length may the filtering peak occur at same position, among Fig. 2 (a) and (c) at the filtering peak of long wave position almost at same position, therefore, if a certain specific band filtering is not had special bandwidth requirement again, the structure of selecting the thin-core fibers about 2cm to insert, the filter filtering characteristic that obtains like this is simple, and cost is relatively low.
A very important index of wave filter during temperature-responsive is directly connected to the stability of its work.The present invention uses a programmable temperature control furnace to test the temperature stability that inserts the wave filter sample of 2cm thin-core fibers.As can be seen from Figure 3, the position of interference peaks centre wavelength is along with the rising of temperature is drifted about to the long wave direction, and both present a good linear relationship.Calculate the slope of this straight line, obtain the temperature-responsive sensitivity of wave filter, be 15pm/ ℃, the temperature stability that this wave filter is described is goodish.
In addition, because the effective refractive index of the higher order mode that excites transmission is subjected to the influence of extraneous refractive index, so this wave filter utilizes the drift of its centre wavelength also to can be used as sensing applications.This wave filter has carried out the test of refractive index to the sucrose solution of variable concentrations, and (mass percent is respectively: (1.381,5.123,8.425,11.817,14.821,18.033,21.136,24.242,26.901,29.577,32.432,35.065; Corresponding refractive index is 1.3346,1.3400,1.3448,1.3500,1.3547,1.3599,1.3651,1.3704,1.3750,1.3798,1.3850,1.3899), can see, its to external world variations in refractive index be quite responsive, sensitivity reaches 135.5/ unit refractive index, sees Fig. 4.And within a large range, the drift of variations in refractive index and centre wavelength is a linear relationship, and therefore this wave filter has the very big potentiality as Application in Sensing.
Claims (1)
1, a kind of all-fiber filter based on thin-core fibers comprises enclosure, it is characterized in that: the single-mode fiber assembly passes the enclosure setting, and the two ends of single-mode fiber assembly are connected with ring flange respectively; Described single-mode fiber assembly comprises three section single-mould fibers of series connection, wherein the single-mode fiber at two ends adopts standard single-mode fiber, the interlude single-mode fiber adopts thin core single-mode fiber, the coaxial setting of three section single-mould fibers, the two ends of thin core single-mode fiber respectively with an end welding of two segment standard single-mode fibers; Described standard single-mode fiber adopts Corning SMF28 single-mode fiber, and described thin core single-mode fiber adopts Nufern 460-HP single-mode fiber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009101007651A CN101604048B (en) | 2009-07-21 | 2009-07-21 | All-fiber filter based on thin-core fibers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009101007651A CN101604048B (en) | 2009-07-21 | 2009-07-21 | All-fiber filter based on thin-core fibers |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101604048A true CN101604048A (en) | 2009-12-16 |
CN101604048B CN101604048B (en) | 2012-02-01 |
Family
ID=41469847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2009101007651A Expired - Fee Related CN101604048B (en) | 2009-07-21 | 2009-07-21 | All-fiber filter based on thin-core fibers |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN101604048B (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102967388A (en) * | 2012-11-01 | 2013-03-13 | 上海大学 | Intrinsic F-P microcavity high-sensitivity temperature sensor based on micro-sized conical fiber probe and manufacture method thereof |
CN103196520A (en) * | 2012-01-06 | 2013-07-10 | 中国计量学院 | Transmission-type optical fiber liquid level sensor with irregular core structure |
CN103823125A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Fine-core optical core and magnetic fluid-based electric field sensor |
CN105698858A (en) * | 2016-02-04 | 2016-06-22 | 华中科技大学 | Bending direction judging optical fiber sensor capable of simultaneously measuring curvature and temperature |
CN106154421A (en) * | 2015-04-10 | 2016-11-23 | 福州高意通讯有限公司 | A kind of all-fiber etalon or the manufacture method of wave filter |
CN106291410A (en) * | 2015-10-13 | 2017-01-04 | 北京信息科技大学 | A kind of Measurement Method for Magnetic Field based on thin-core fibers Mach-Zehnder interferometer |
CN108168729A (en) * | 2018-01-30 | 2018-06-15 | 中国海洋大学 | Based on the cascade 2 ocean temperature sensors of thin-core fibers and standard single-mode fiber |
CN109283616A (en) * | 2018-12-10 | 2019-01-29 | 中国科学院上海微系统与信息技术研究所 | Temperature-insensitive Mach-Zehnder interferometers |
CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
WO2020118807A1 (en) * | 2018-12-10 | 2020-06-18 | 中国科学院上海微系统与信息技术研究所 | Temperature-insensitive mach-zehnder interferometer |
WO2021215232A1 (en) * | 2020-04-20 | 2021-10-28 | 住友電気工業株式会社 | Gain flattening filter, and method for manufacturing gain flattening filter |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201464669U (en) * | 2009-07-21 | 2010-05-12 | 浙江大学 | Interference type fine-core optical fiber wave filter |
-
2009
- 2009-07-21 CN CN2009101007651A patent/CN101604048B/en not_active Expired - Fee Related
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103196520A (en) * | 2012-01-06 | 2013-07-10 | 中国计量学院 | Transmission-type optical fiber liquid level sensor with irregular core structure |
CN102967388A (en) * | 2012-11-01 | 2013-03-13 | 上海大学 | Intrinsic F-P microcavity high-sensitivity temperature sensor based on micro-sized conical fiber probe and manufacture method thereof |
CN103823125A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Fine-core optical core and magnetic fluid-based electric field sensor |
CN106154421B (en) * | 2015-04-10 | 2019-11-22 | 福州高意通讯有限公司 | A kind of production method of all -fiber etalon or filter |
CN106154421A (en) * | 2015-04-10 | 2016-11-23 | 福州高意通讯有限公司 | A kind of all-fiber etalon or the manufacture method of wave filter |
CN106291410B (en) * | 2015-10-13 | 2018-11-23 | 北京信息科技大学 | A kind of Measurement Method for Magnetic Field based on thin-core fibers Mach-Zehnder interferometer |
CN106291410A (en) * | 2015-10-13 | 2017-01-04 | 北京信息科技大学 | A kind of Measurement Method for Magnetic Field based on thin-core fibers Mach-Zehnder interferometer |
CN105698858B (en) * | 2016-02-04 | 2018-03-09 | 华中科技大学 | A kind of fibre optical sensor for the curvature and temperature simultaneously measuring for differentiating bending direction |
CN105698858A (en) * | 2016-02-04 | 2016-06-22 | 华中科技大学 | Bending direction judging optical fiber sensor capable of simultaneously measuring curvature and temperature |
CN108168729A (en) * | 2018-01-30 | 2018-06-15 | 中国海洋大学 | Based on the cascade 2 ocean temperature sensors of thin-core fibers and standard single-mode fiber |
CN108168729B (en) * | 2018-01-30 | 2024-02-13 | 中国海洋大学 | Two-point seawater temperature sensor based on cascade connection of fine core optical fiber and standard single mode optical fiber |
CN109283616A (en) * | 2018-12-10 | 2019-01-29 | 中国科学院上海微系统与信息技术研究所 | Temperature-insensitive Mach-Zehnder interferometers |
WO2020118807A1 (en) * | 2018-12-10 | 2020-06-18 | 中国科学院上海微系统与信息技术研究所 | Temperature-insensitive mach-zehnder interferometer |
CN109283616B (en) * | 2018-12-10 | 2023-09-12 | 中国科学院上海微系统与信息技术研究所 | Temperature insensitive Mach-Zehnder interferometer |
CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
WO2021215232A1 (en) * | 2020-04-20 | 2021-10-28 | 住友電気工業株式会社 | Gain flattening filter, and method for manufacturing gain flattening filter |
Also Published As
Publication number | Publication date |
---|---|
CN101604048B (en) | 2012-02-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101604048B (en) | All-fiber filter based on thin-core fibers | |
Geng et al. | High-sensitivity Mach–Zehnder interferometric temperature fiber sensor based on a waist-enlarged fusion bitaper | |
Takenaga et al. | Reduction of crosstalk by trench-assisted multi-core fiber | |
CN102261967B (en) | Coaxial optical fiber-based temperature and stress dual-parameter optical fiber sensor | |
CN101464539B (en) | Mach-Zehnder interferometer based on coaxial optical fiber | |
CN101261117A (en) | Strain transducer based on porous microstructure optical fibre | |
CN103439765B (en) | A kind of All-optical-fiber type multi-path interferometer | |
CN103940455A (en) | All-fiber high accuracy sensor based on optical fiber multi-mode interference and application thereof | |
CN103605187B (en) | A kind of class double-core photonic crystal fiber tunable optic filter based on selective filling | |
CN107085261A (en) | Multi-core fiber | |
CN102830464A (en) | Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating | |
CN202648795U (en) | Optical power and wavelength measuring apparatus | |
Tong et al. | Ultra-long-period fiber grating cascaded to a knob-taper for simultaneous measurement of strain and temperature | |
CN105807364A (en) | Long-period fiber bragg grating based on mechanical micro-bending and preparation method thereof | |
CN201464669U (en) | Interference type fine-core optical fiber wave filter | |
CN201181206Y (en) | Strain sensor based on optical fiber with porous micro-structure | |
CN103698841A (en) | Microstructure fiber device | |
EP2369377B1 (en) | Optical fiber-type optical filter | |
CN103091773A (en) | 1.31 micrometer and 1.55 micrometer two wavebands tunable photonic crystal optical fiber filter | |
CN103713411B (en) | Manufacturing method of tunable band-pass optical fiber filter | |
CN102830462B (en) | High-birefringence component and manufacturing method thereof | |
Jaroszewicz et al. | Broadband photonic crystal fiber coupler with polarization selection of coupling ratio | |
CN104834057B (en) | Long-period fiber grating bandpass and band-rejection filter | |
CA2427353A1 (en) | Optical fibre filter | |
CN204116743U (en) | Tunable band leads to optical fiber filter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20140721 |
|
EXPY | Termination of patent right or utility model |