CN101464541B - Optical fiber beam divider based on solid core photonic crystal fiber with high refractive index - Google Patents
Optical fiber beam divider based on solid core photonic crystal fiber with high refractive index Download PDFInfo
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- CN101464541B CN101464541B CN2009100676899A CN200910067689A CN101464541B CN 101464541 B CN101464541 B CN 101464541B CN 2009100676899 A CN2009100676899 A CN 2009100676899A CN 200910067689 A CN200910067689 A CN 200910067689A CN 101464541 B CN101464541 B CN 101464541B
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Abstract
The invention relates to an optical fiber beam splitter based on a high refractive index solid core photonic crystal optical fiber. The beam splitter comprises a high refractive index solid core photonic crystal optical fiber, a micro-lens array, a multi-beam integrated leading-out single-mode optical fiber, a fixed capillary and an external sleeve thereof. The micro-lens array is placed at the output end of the high refractive index solid core photonic crystal optical fiber; the multi-beam integrated leading-out single-mode optical fiber is arranged according to a multi-beam integrated manner corresponding to the solid core of the photonic crystal optical fiber; the fixed capillary is used for fixing the position of the multi-beam integrated leading-out single-mode optical fiber; and the external sleeve is used for fixing the high refractive index solid core photonic crystal optical fiber and the multi-beam integrated leading-out single-mode optical fiber into a whole. The invention divides a beam of light into a plurality of beams of light to change a beam of light radiated at the center into a plurality of beams of light emerged on the periphery, has the advantages of more splitting beams, strong light of each beam, small volume and low loss, simple structure, applicable spectrum band width, high efficiency, and wide application scope.
Description
Technical field
The present invention relates to the manufacturing of optical fibre device, particularly a kind of fiber optic splitter based on solid core photonic crystal fiber with high refractive index.The present invention have beam splitting many, respectively restraint isocandela, volume is little and the little characteristics of loss, and is and simple in structure, is suitable for the wide and high characteristics of efficient of bands of a spectrum, applied range.
Background technology
" beam splitting " is the technology of often using in the optical system, is about to a branch of light and is divided into multi-beam.Multiple beam beam splitting device the earliest is to be mapped to " glass stack " or " monolithic transparent medium " with light beam is oblique, its reflection and transmitted light are the beam splitting result of incident light just, and later people adopt coating technique to plate the medium mould on various substrates or thin mold materials and realized the monolithic beam splitter that different splitting ratios are controlled.Another kind of beam splitting device commonly used is " prism beam splitter ".These beam splitters that " are divided into two " are the optical beam splitting devices that generally use at present.Also have in recent years the first-order diffraction of " Darman raster " is answered the land used example as beam splitting.In the ordinary optic fibre system, beam splitting is to utilize the Mode Coupling effect between the multifiber fibre core to realize, relies on distance adjustment splitting ratio between the fibre core.
Summary of the invention
The purpose of this invention is to provide a kind of fiber optic splitter based on solid core photonic crystal fiber with high refractive index, it is improvements over the prior art.Utilize the result of double action of " the full-internal reflection type leaded light " and " band gap limits leaded light " of this kind photonic crystal fiber, realization will be converted to the multi-beam of the solid core outgoing of circumferential distribution at a branch of light of photonic crystal fiber center incident, have beam splitting many, respectively restraint isocandela, volume is little and the little characteristics of loss.The present invention is simple in structure, is suitable for the wide and high characteristics of efficient of bands of a spectrum, applied range.
Fiber optic splitter based on solid core photonic crystal fiber with high refractive index provided by the invention comprises solid core photonic crystal fiber with high refractive index 1, micro lens array 2, integrated derivation single-mode fiber 3 of multi beam and fixed capillary 4 thereof, outer tube 5.
Above-mentioned solid core photonic crystal fiber with high refractive index is the high index of refraction bar construction leaded light solid core of arranging a circle doping (germanium) around siliceous fibre core, because the double action of " full-internal reflection type leaded light " and " band gap limits leaded light ", the light that incides the core district can only be coupled in the high index of refraction solid core transmit, promptly form beam splitting; Above-mentioned micro lens array is inserted the output terminal at solid core photonic crystal fiber with high refractive index, and the light of beam splitting outgoing is coupled to respectively in the corresponding derivation single-mode fiber; The integrated derivation single-mode fiber of above-mentioned multi beam is that single-mode fiber is arranged according to the integrated form of the multi beam corresponding with the solid core of aforementioned lights photonic crystal fiber; Above-mentioned fixed capillary is used for the integrated derivation single-mode fiber of multi beam stationkeeping; Above-mentioned outer tube is that solid core photonic crystal fiber with high refractive index and the integrated derivation single-mode fiber of multi beam bundle two parts are fixed into one.
Described solid core photonic crystal fiber with high refractive index is to be matrix with silicon (quartz), and the refractive index in fiber cores district is 1.45, and diameter is the 7-14 micron.
High index of refraction solid core in the described solid core photonic crystal fiber with high refractive index is for mixing germanite glass (quartz), and its refractive index is 1.65, and diameter D is the 4-8 micron, and solid core spacing Λ is the 5-10 micron.
The length of described solid core photonic crystal fiber with high refractive index is less than 10 millimeters.
Described micro lens array is and solid core gauge structure micro-optic non-spherical lens array coupling mechanism one to one.
The integrated derivation single-mode fiber of described multi beam is to arrange with the corresponding one by one general single mode fiber boundling in micro lens array position, and fixes with the capillary sleeve pipe.
The spacing of the integrated derivation single-mode fiber of described solid core photonic crystal fiber with high refractive index and multi beam is adjustable.
The invention has the advantages that: (1) is simple in structure.The beam splitting process is only finished by one section solid core photonic crystal fiber with high refractive index.(2) parameter of beam splitting light is identical.Because the boundary condition and the design parameter of each solid core are identical, therefore parameters such as the light intensity of each beam splitting light of transmission, transmission time, wavelength are identical therein.This is difficult to accomplish on traditional beam splitter.(3) suitable bands of a spectrum are wide.This beam splitter goes for the bandwidth of 600～1700nm.This is difficult to accomplish on traditional beam splitter.(4) efficient height.Because the acting in conjunction of two kinds of leaded light mechanism, the efficient that makes the light that incides the core district be coupled to solid core increases a lot than traditional fiber beam splitter.
Description of drawings
Fig. 1 is the fiber optic splitter structural representation that the present invention is based on solid core photonic crystal fiber with high refractive index.
Fig. 2 is the structural drawing of six solid core photonic crystal fibers shown in Fig. 1.
Fig. 3 is the beam splitting principle of work synoptic diagram of six solid core photonic crystal fibers shown in Fig. 1.
Embodiment
The invention will be further described below in conjunction with accompanying drawing, and they are not to limit protection scope of the present invention.
As shown in Figure 1,1 is solid core photonic crystal fiber with high refractive index; 2 is micro lens array; The integrated derivation single-mode fiber of 3 multi beams; 4 is the capillary fixed sleeving; 5 is outer tube.
Among Fig. 2: 1-1 is silica-based fibre core; 1-2 is the high index of refraction solid core; 1-3 airport inner cladding; 1-4 is an optical fiber jacket.Λ is the spacing between the airport (solid core); D is the diameter of airport (solid core).
Of the present invention is to utilize solid core photonic crystal fiber with high refractive index to realize a branch of light that incides the core district is divided into multi beam based on the solid core photonic crystal fiber with high refractive index beam splitter, and respectively restraint aplanatic beam splitting process, be coupled to many single-mode fibers realization outputs one to one by micro lens array again.The beam splitting mechanism of solid core photonic crystal fiber with high refractive index is because this photonic crystal fiber has " full-internal reflection type leaded light " and " band gap limits leaded light " double action.Because, for the projecting material of " solid core " its refractive index in this photonic crystal fiber, so can lean on the form leaded light of total internal reflection in " solid core "; And be lower than " solid core " on every side owing to its refractive index for fiber cores district (optical fiber symcenter), so formed " resonance type band gap ".By the design optical fiber parameter lambda1-wavelength is between " resonance type band gap ", just can cause the light of this wavelength not to be limited in the core district, but be coupled in " solid core " of periphery, derive by the total internal reflection mechanism in the solid core again, will be thereby realize in a branch of light of center incident (left side, single intrafascicular heart incident) be transformed into peripheral outgoing multi-beam (right side, the output of multi beam solid core), as Fig. 3.These light beams are coupled into general single mode fiber respectively by micro lens array again and derive, and have just constituted fiber optic splitter of the present invention.Characteristics such as it is many that therefore this beam-splitting method has beam splitting, and it is identical that each restraints optical parameter (intensity, frequency domain and time domain specification), and the little and loss of volume is little.The annexation of each parts is in this device, the single beam laser vertical incidence is in the input end center of solid core photonic crystal fiber with high refractive index 1, through above-mentioned " two guiding " mechanism incident light is coupled in the solid core on every side, then produced multi beam isocandela laser through behind this optical fiber, through micro lens array 2 laser coupled after the beam splitting is advanced the corresponding integrated derivation single-mode fiber of multi beam again, form beam splitting output.
Solid core photonic crystal fiber is on the basis of common silica-based (quartz) photonic crystal fiber ground floor airport around the core district to be replaced to the material higher than core district refractive index to constitute solid bar, thereby forms the beam splitting guide lighting channel.The position that hole centre distance (Λ) by regulating airport (solid bar) and airport (solid bar) diameter (D) just can be adjusted the zero dispersion point is to adapt to the needs of different-waveband laser instrument.
Application Example 1: for quartz material optical fiber, zero chromatic dispersion forms individual layer inner cladding (seeing accompanying drawing 2), optical fiber parameter: Λ=7.5 μ m, D=4.6 μ m at the 800nm wave band around integrated 6 the high index of refraction solid bar in core district (mixing germanium);
Application Example 2: for quartz material, zero chromatic dispersion is at the 1550nm wave band, and optical fiber structure is the same, optical fiber parameter: Λ=8.0 μ m, D=6.2 μ m.
Solid core photonic crystal fiber length is less than 10mm.
Concrete drawing method: identical with the drawing mode of normal optical photonic crystal fiber, just around silica-based core district rod, arrange the high index of refraction rod that one deck mixes.Prefabricated rods is made and to be taked on request the ratio of size and thermograde to select rod (pipe) accumulation moulding, adds sleeve pipe and fixes; Get the stage casing, detected parameters after suitably stretching; Get the stage casing after suitably stretching once more after qualified, this process is drawn into optical fiber at last until obtaining desired prefabricated rods size on the fibre-optical drawing tower.
Light beam after the solid core photonic crystal fiber with high refractive index beam splitting is coupled to one to one by micro lens array and derives in the general single mode fiber; These general single mode fibers are fixed with kapillary, constitute the integrated derivation single-mode fiber of multi beam; Solid core photonic crystal fiber with high refractive index is identical with this two-part external diameter of the integrated derivation single-mode fiber of multi beam, is positioned in the outer tube; Adjust the distance between the two, when coupling loss hour, two parts and outer tube are adhesively fixed, just constitute whole optical-fiber type beam splitter.
This fiber optic splitter is derived the coupling light in the solid core of arranging of certain wavelength coverage of a branch of center incident on every side, so the multi beam emergent light all is identical on intensity, time and spectral characteristic; Because the very short and solid core of used optical fiber is near the leaded light wave band is designed in zero chromatic dispersion, beam characteristics after the used beam splitting and incident light characteristic are also almost constant.These are exactly the outstanding feature of this fiber optic splitter.
Claims (2)
1. the fiber optic splitter based on solid core photonic crystal fiber with high refractive index comprises solid core photonic crystal fiber with high refractive index, micro lens array, the integrated derivation single-mode fiber of multi beam and fixed capillary and outer tube thereof;
Described micro lens array is inserted the output terminal at solid core photonic crystal fiber with high refractive index, and the light of beam splitting outgoing is coupled to respectively in the corresponding derivation single-mode fiber; The integrated derivation single-mode fiber of described multi beam is that single-mode fiber is arranged according to the integrated form of the multi beam corresponding with the solid core of aforementioned lights photonic crystal fiber; Described fixed capillary is used for the integrated derivation single-mode fiber of multi beam stationkeeping; Described outer tube is that solid core photonic crystal fiber with high refractive index and the integrated derivation single-mode fiber of multi beam bundle two parts are fixed into one, it is characterized in that it is to mix the germanium solid bar around integrated 6 highs index of refraction in core district to form the individual layer inner cladding.
2. according to the described fiber optic splitter of claim 1, it is characterized in that high index of refraction solid core in the described solid core photonic crystal fiber with high refractive index is for mixing germanite English glass, when zero chromatic dispersion at the 800nm wave band, optical fiber parameter: solid core spacing Λ=7.5 μ m, solid core diameter D=4.6 μ m; When zero chromatic dispersion at the 1550nm wave band, optical fiber parameter: solid core spacing Λ=8.0 μ m, solid core diameter D=6.2 μ m.
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| CN2009100676899A CN101464541B (en) | 2009-01-14 | 2009-01-14 | Optical fiber beam divider based on solid core photonic crystal fiber with high refractive index |
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| CN101464541B true CN101464541B (en) | 2011-05-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102411167B (en) * | 2010-09-26 | 2013-05-08 | 清华大学 | Photonic crystal fiber (PCF) |
| CN104238012A (en) * | 2014-08-22 | 2014-12-24 | 常州凌凯特电子科技有限公司 | Capillary tube for input end of PLC coplanar waveguide type optical divider |
| CN111458668A (en) * | 2020-06-02 | 2020-07-28 | 黑龙江大学 | Vector magnetic field sensor and method for detecting magnetic field by using same |
| CN111977959B (en) * | 2020-08-25 | 2021-10-22 | 东北大学 | V-shaped high birefringent microstructure optical fiber with air hole size controlled by air pressure and manufacturing method thereof |
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