CN102591039A - Graphene film and D-shaped fiber broadband light polarizer - Google Patents
Graphene film and D-shaped fiber broadband light polarizer Download PDFInfo
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- CN102591039A CN102591039A CN2012100670235A CN201210067023A CN102591039A CN 102591039 A CN102591039 A CN 102591039A CN 2012100670235 A CN2012100670235 A CN 2012100670235A CN 201210067023 A CN201210067023 A CN 201210067023A CN 102591039 A CN102591039 A CN 102591039A
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Abstract
The invention relates to the technical field of light communication, and provides a graphene film and D-shaped fiber broadband light polarizer, which aims to be tiny in size, simple and convenient in preparation, high in extinction ratio and wide in working frequency band, does need an external energy source, can be directly integrated on an optical fiber and has a graphene film and D-shaped fiber composite structure. A D-shaped groove is cut on the upper side of the optical fiber, the depth of the D-shaped groove reaches a fiber core, a graphene film is covered on a plane of the optical fiber, so that the graphene film and D-shaped fiber broadband light polarizer is formed, and the surface of the graphene film and D-shaped fiber broadband light polarizer is packaged by low-refractivity ultraviolet adhesive. Optical signals of optional polarization states are inputted into one section of the optical fiber and pass a graphene acting area, and then polarization light with high extinction ratio is outputted from the other end of the optical fiber. A modulator can be directly coupled in an optical fiber system, and polarization control with the distinction ratio of 20dB can be realized.
Description
Technical field
The present invention relates to optical communication and sensing transmission technique field thereof.A kind of passive light signal polarized controller is provided, can have relied on the generation of the special guided wave character realization linearly polarized light of grapheme material.
Background technology
In the application of contemporary optical communication and sensing technology, the quality of light signal is a key factor that influences system performance.Wherein, polarization state is a core parameter of decision optical signal quality.In optical waveguides such as optical fiber, because effects such as crooked and scattering make laser produce different polarization states, material exists different decay, chromatic dispersion and nonlinear effect to different polarized lights, to the considerable influence of quality generation of light signal.Be to guarantee transmission quality, must select and stablize that in broadband optical communication net and high precision optical sensor system, optical polariser has become a kind of requisite element to the polarization state of light signal.Based on crooked deflecting effect, macromolecule gas barrier effect, selective reflecting effect and selective attenuation absorption effect etc., people prepare various optical polarization devices.
Optical polarizator is divided into active and passive two kinds.The traditional active polarizer mainly utilizes some crystal effective refractive index with the characteristic that extra electric field intensity changes, and makes light produce two vertical polarization attitudes that intensity is different, with intensity wherein big as Principal State of Polarization.The Traditional passive polarizer is deferred to Malus law, to different polarization optical transmission rate, exports the polarized light of specific direction through material.Passive polarization technology is simple in structure, and failure rate is low, and energy consumption is little, and it is integrated to be convenient to all-optical network, uses more extensive than active polarizer.Current, commercial passive polarizer mainly contains the polaroid based on bidirectional color organic matters such as iodine sulfate quinine, tourmaline or polyvinyl alcohol films, based on the optical fiber polarisation ring of the crooked scattering effect of mechanical stretching with based on the grating polarizer of partial reflection etc.
But there are many limitation in the Traditional passive polarizer, influences its further application at the optical communication sensory field.At first, bigger based on the polaroid size of bidirectional color organic matter, be generally a centimetre magnitude, and its to play the folk prescription formula be vertical transmission, only be adapted at using in the lens light path, be not suitable for being integrated into fibre system; The second, mechanical stretching formula optical fiber polarization controller relies on manually-operated to rise partially, low precision, and stability is low, and randomness is big, and the extra polarization ring that is coupled into can bring extra insertion loss and time delay to system, even produces resonance, introduces the noise of complicacy; The 3rd, though high based on the polarizer precision of fiber grating, complicated process of preparation, with high costs, debug consuming timely, and have than high attenuation, be unfavorable for being applied in the feeble signal environment.
For overcoming the above problems, promote inclined to one side quality and the system stability of fibre system with polarizer, reduction of device size is convenient to integrated, and a kind of new passive optical polarizer is demanded research urgently.Grapheme material has unique slab guide characteristic as a kind of new atomic structure of carbon two dimensional surface material.Single-layer graphene thickness be merely a carbon atom size (~ 10nm), chemical property is stable, has strong electric conductivity and light conductivity.Different with the conventional planar waveguide, the telegram in reply conductance imaginary part of graphene-structured is a negative, makes it can efficient propagation TE pattern, relative retardation TM pattern.When full-polarization is propagated on Graphene surface, because its two dimensional surface characteristic, decay rapidly, show as and be absorbed perpendicular to the polarization state of Graphene; The polarization state that is parallel to the Graphene plane serves as main the propagation with the TE pattern under the influence of the positive imaginary part of its innerland trajectory rate, and damping capacity is minimum, shows as to be switched on.After through sufficiently long one section Graphene waveguide, the polarization mode intensity that is parallel to the Graphene plane is better than the polarization mode of vertical direction greatly, so realized the polarizer function.And the Graphene plane layer can be prepared in the waveguide surface of virtually any size, form and most materials, can realize combining with the direct of fibre-optic transmission system (FOTS).
Than traditional polarizer, graphene film-D type Optical Fiber Composite structure polarizer has tangible characteristics and advantage.The first, technology is easy, and integration is good, can directly on optical fiber is slim, prepare, and combines together with one section optical fiber, is not coupled into light path as independent optical device.The insertion loss of conventional polariser is generally 3-10dB; And exist and insert the phase mismatch noise; This Graphene-Optical Fiber Composite structure polarizer has been avoided this insertion loss and mismatch noise, and is significant on optical fiber telecommunications system transmission range and optical fiber sensing system measuring accuracy.The second, size is small, and particularly the Graphene zone of action is very little.Traditional polarizer size is generally several centimetres to tens centimetres, and graphene film-D type optical fiber structure polarizer diameter is the optical fiber size, and length is several millimeters.Littler size is brought higher system compatibility and lower preparation cost.The 3rd, working stability, antinoise and interference performance are strong.The active polarizer of tradition need be introduced additional energy, certainly will bring enchancement factor and interference, the drawing-in system error; Traditional passive polarizer general using material and structure influence scattering of light, travel path and reflectivity; The chemical constitution that has is understable, and the mechanical realization that has is prone to deformation, or the like.The polarizer compact conformation of graphene film-D type Optical Fiber Composite structure; Operation material Graphene chemically stable, assorted faint to scattering, be not vulnerable to external interference after the encapsulation; Can keep the highly stable for a long time of polarization state control, the variation of polarization direction can not occur.The 4th, it is high to play inclined to one side precision, more thorough to the polarization state specific filtration resistance of different directions.Traditional polarizer is in being applied to fibre system the time, and the maximum extinction ratio between the polarization state is generally about 10dB, and the polarizer of graphene film-D type Optical Fiber Composite structure is in subband, and extinction ratio can reach 20dB, is convenient to more detect.The 4th, it is big to be suitable for bandwidth, and application potential is strong.The polarizer of graphene film-D type optical fiber structure is applicable to the wavelength coverage of 400nm-1550nm, has broken through the restriction of conventional polariser part frequency-selecting effect, can realize that inclined to one side function is played in the broadband from the black light to the far red light.
Summary of the invention
The objective of the invention is to that the conventional polariser loss is high, volume is big, application surface is narrow, preparation cost is high in order to overcome, shortcoming such as a little less than the narrow bandwidth, antijamming capability, a kind of graphene film-D type fiber broadband light polarizer that can realize at a high speed accurate Polarization Control is provided.
The present invention is for realizing that above-mentioned purpose adopts following technical scheme:
A kind of broadband light polarizer based on graphene film-D type optical fiber; It is characterized in that: comprise optical fiber, graphene film layer and packaging plastic; Said optical fiber side is provided with D type groove, and said D type trench bottom is close to the fibre core of optical fiber, and D type trench bottom covers at least one layer graphene film; Said graphene film is close to the fibre core of optical fiber, and said D type groove is through the packaging plastic encapsulation.
Said D type groove is through grinding along optical fiber side or the cutting mode acquisition; Said D type groove is through grinding along optical fiber side or the cutting mode acquisition; Said grinding or depth of cut are for just being the half the of fibre diameter; Promptly grind or cut to the half the of fibre core, said D type groove bottom otch is smooth, and cell body length is about 5mm.
Should based on broadband light polarizer working frequency range of graphene film-D type optical fiber be from visible light to far frequency range 400-1550nm, the extinction ratio between the vertical polarization attitude is 20dB, coupling insertion loss is small.
Said packaging plastic is the low-refraction ultraviolet glue.
Said optical fiber adopts any optical fiber of place system, play be coupled into, coupling goes out and the substrate effect; Closely cover one deck or a few layer graphene simple substance on the two dimensional surface, accomplish the inclined to one side function that rises of light.
The present invention has following beneficial effect:
One, than conventional polariser, technical advantage of the present invention is, size is small, and diameter is merely fibre diameter; Simple in structure, coupling is convenient, and efficient is higher, directly on optical fiber, makes, and technology is simple, and loss is little, and system directly merges with optic fibre light path; Superior performance, extinction ratio can be applied in the small-signal environment of requirements at the higher level up to 20dB; The work zone is roomy; With low cost.
Description of drawings
Fig. 1 is a D type fiber optic, light transmission synoptic diagram.
Fig. 2 is a Graphene two dimensional surface microphotograph.
Fig. 3 is the three-dimensional structure synoptic diagram of this polarizer.
Fig. 4 is the cross section view of this polarizer.
Fig. 5 is the vertical view of this polarizer.
Fig. 6 a is a light intensity attenuation situation synoptic diagram;
Fig. 6 b is a light intensity attenuation situation synoptic diagram;
Among Fig. 3-5, the parameter label meaning is: 1-optical fiber input end, and the 2-graphite film, 3-optical fiber exit end, 4-fiber core part, 5-low-refraction ultraviolet glue, 6-goes into to hold polarization state, 7-Graphene active region polarization state, 8-exports polarization state.
Fig. 6 (a), Fig. 6 (b) are the extinction ratio synoptic diagram of two groups of different optical bands, and its examination criteria is output terminal intensity (dBm of unit).
Embodiment
In Fig. 3, on one section optical fiber, between incident end (1) and the exit end (3); Cut out a grooving that tangent plane is smooth, the degree of depth reaches fibre core from optical fiber side; Its length is about 5mm, and width is about fibre diameter, and at this tangent plane bottom tiling graphene film (2).In practical operation, the unfixed light signal in polarization direction imports graphene film (2) from incident end (1), and the polarization direction is uploaded at graphene film with it and broadcast changing, and is finally derived by exit end (3).Fig. 4 and Fig. 5 are respectively vertical view and sectional view.
The present invention is " optical fiber side 1/2 truncation-otch Graphene covers " structure.Grind in common silica fibre covering side or cut one section D type cell body that otch is smooth, cell body length is about 5mm, and the degree of depth is for just arriving and contact the fibre core position.This notch width is almost fibre diameter.On the grooving base plane, cover one deck or which floor graphene film, total is with the encapsulation of low-refraction ultraviolet glue, and encapsulation rear polarizer diameter is no more than optical fiber itself 10%.
The guided wave effect realization that it is special that the present invention utilizes the Graphene two dimensional surface is parallel to the efficient conduction of the TE ripple on Graphene plane, hinders other polarization modes, realizes rising partially of linearly polarized light.
This polarizer principle of work is: light signal transmits in optical fiber with each polarization state; Arrive " graphene film-D type optical fiber " zone, because this section part optical fiber surface covering is pruned, fibre core is close to graphene film; Light signal is propagated along the Graphene two dimensional surface with the evanescent wave form; The conduction of Graphene complex permittivity property effect surface wave hinders the HE pattern, conducting TE and TM ripple.Influenced by two-dimensional waveguide; TM ripple (orthogonal polarized light) decay perpendicular to the Graphene plane is serious; Parallel TE ripple (parallel polarized light) conduction with the Graphene plane is good; Be presented as along the linearly polarized light that is parallel to the Graphene in-plane through the light behind the Graphene zone of action, thereby realizing polarization function at output terminal.
Than conventional polariser, technical advantage of the present invention is, size is small, and diameter is merely fibre diameter; Simple in structure, coupling is convenient, and efficient is higher, directly on optical fiber, makes, and technology is simple, and loss is little, and system directly merges with optic fibre light path; Superior performance, extinction ratio can be applied in the small-signal environment of requirements at the higher level up to 20dB; The work zone is roomy; With low cost.
Claims (4)
1. broadband light polarizer based on graphene film-D type optical fiber; It is characterized in that: comprise optical fiber, graphene film layer and packaging plastic; Said optical fiber side is provided with D type groove, and said D type trench bottom is close to the fibre core of optical fiber, and D type trench bottom covers at least one layer graphene film; Said graphene film is close to the fibre core of optical fiber, and said D type groove is through the packaging plastic encapsulation.
2. a kind of broadband light polarizer according to claim 1 based on graphene film-D type optical fiber; It is characterized in that: said D type groove is through grinding along optical fiber side or the cutting mode acquisition; Said grinding or depth of cut are for just being the half the of fibre diameter; Promptly grind or cut to the half the of fibre core, said D type groove bottom otch is smooth.
3. the broadband light polarizer of graphene film according to claim 1-D type Optical Fiber Composite structure, its performance characteristic is: working frequency range is that the extinction ratio between the vertical polarization attitude is 20dB from visible light to far frequency range 400-1550nm.
4. a kind of broadband light polarizer based on graphene film-D type optical fiber according to claim 1, it is characterized in that: said packaging plastic is the low-refraction ultraviolet glue.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869502A (en) * | 2014-02-10 | 2014-06-18 | 南京大学 | Three-dimensional all-fiber optic polarizer based on combination of graphene and microfiber |
| CN105068279A (en) * | 2015-08-04 | 2015-11-18 | 电子科技大学 | Polarized insensitive optical modulator based on arc-shaped graphene |
| CN106054313A (en) * | 2016-07-27 | 2016-10-26 | 深圳大学 | Black phosphor based online optical fiber polarizer and its preparation method |
| CN106125350A (en) * | 2016-08-30 | 2016-11-16 | 张家港初恒激光科技有限公司 | Graphene electro-optical modulator based on D-type optical fiber and preparation method thereof |
| CN107037509A (en) * | 2017-06-16 | 2017-08-11 | 电子科技大学 | A kind of D type ultra-thin glass fiber structures of graphene auxiliary type |
| CN107121410A (en) * | 2017-05-04 | 2017-09-01 | 南昌航空大学 | Based on D-type optical fiber SPR refractive index sensing models |
| CN108761953A (en) * | 2018-07-12 | 2018-11-06 | 暨南大学 | A kind of complete optical fiber polarization control and intensity modulated multifunction device based on graphene |
| CN108871566A (en) * | 2018-05-11 | 2018-11-23 | 暨南大学 | A kind of integrated graphene photodetector of optical fiber |
| CN109507121A (en) * | 2018-11-14 | 2019-03-22 | 哈尔滨工程大学 | A kind of hypersensitive heavy metal ion sensor device and preparation method |
| CN110133799A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | The integrated polarization photo-coupler and preparation method thereof of waveguide based on graphene |
| CN112880546A (en) * | 2021-01-11 | 2021-06-01 | 于孟今 | Device and system for monitoring optical fiber distortion |
| CN114114546A (en) * | 2021-11-22 | 2022-03-01 | 曲阜师范大学 | All-fiber polarizer based on mixed plasmon waveguide structure |
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| US20110101309A1 (en) * | 2009-11-04 | 2011-05-05 | International Business Machines Corporation | Graphene based switching device having a tunable bandgap |
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| US20110101309A1 (en) * | 2009-11-04 | 2011-05-05 | International Business Machines Corporation | Graphene based switching device having a tunable bandgap |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869502A (en) * | 2014-02-10 | 2014-06-18 | 南京大学 | Three-dimensional all-fiber optic polarizer based on combination of graphene and microfiber |
| CN105068279A (en) * | 2015-08-04 | 2015-11-18 | 电子科技大学 | Polarized insensitive optical modulator based on arc-shaped graphene |
| CN106054313B (en) * | 2016-07-27 | 2019-11-12 | 深圳大学 | A kind of online fibre optic polarizer and preparation method thereof based on black phosphorus |
| CN106054313A (en) * | 2016-07-27 | 2016-10-26 | 深圳大学 | Black phosphor based online optical fiber polarizer and its preparation method |
| CN106125350A (en) * | 2016-08-30 | 2016-11-16 | 张家港初恒激光科技有限公司 | Graphene electro-optical modulator based on D-type optical fiber and preparation method thereof |
| CN107121410A (en) * | 2017-05-04 | 2017-09-01 | 南昌航空大学 | Based on D-type optical fiber SPR refractive index sensing models |
| CN107037509A (en) * | 2017-06-16 | 2017-08-11 | 电子科技大学 | A kind of D type ultra-thin glass fiber structures of graphene auxiliary type |
| CN108871566A (en) * | 2018-05-11 | 2018-11-23 | 暨南大学 | A kind of integrated graphene photodetector of optical fiber |
| CN108761953A (en) * | 2018-07-12 | 2018-11-06 | 暨南大学 | A kind of complete optical fiber polarization control and intensity modulated multifunction device based on graphene |
| CN109507121A (en) * | 2018-11-14 | 2019-03-22 | 哈尔滨工程大学 | A kind of hypersensitive heavy metal ion sensor device and preparation method |
| CN110133799A (en) * | 2019-04-23 | 2019-08-16 | 天津大学 | The integrated polarization photo-coupler and preparation method thereof of waveguide based on graphene |
| CN112880546A (en) * | 2021-01-11 | 2021-06-01 | 于孟今 | Device and system for monitoring optical fiber distortion |
| CN114114546A (en) * | 2021-11-22 | 2022-03-01 | 曲阜师范大学 | All-fiber polarizer based on mixed plasmon waveguide structure |
| CN114114546B (en) * | 2021-11-22 | 2023-12-19 | 曲阜师范大学 | All-fiber polarizer based on hybrid plasmon waveguide structure |
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