CN104237999A - Broadband terahertz wave polarization-maintaining transmission optical fiber - Google Patents
Broadband terahertz wave polarization-maintaining transmission optical fiber Download PDFInfo
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- CN104237999A CN104237999A CN201410320189.2A CN201410320189A CN104237999A CN 104237999 A CN104237999 A CN 104237999A CN 201410320189 A CN201410320189 A CN 201410320189A CN 104237999 A CN104237999 A CN 104237999A
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Abstract
The invention discloses a broadband terahertz wave polarization-maintaining transmission optical fiber. Oval air holes or rhombus air holes are additionally formed in an optical fiber cladding layer, so that mode fields in a TE mode and a TM mode are distributed in the different quite board spectral ranges, have different effective conversion rates and produce high birefringence; meanwhile, two rows of circular air holes are led into the center of the optical fiber so as to change the symmetry of the structure, optical fiber birefringence is improved, and optical fiber dispersion is adjusted, so that the broadband low-dispersion polarization-maintaining terahertz photonic crystal fiber is obtained, the photonic crystal fiber birefringence value can reach 10<-3> or even 10<-2>, the order of magnitudes of the photonic crystal fiber birefringence value is at least one higher than that of the birefringence value of a traditional polarization-maintaining optical fiber, quite low dispersion with the even dispersion curve is provided in the quite board spectral ranges, and the broadband terahertz wave polarization-maintaining transmission optical fiber is quite important for broadband terahertz pulse distortionless transmission. In addition, the structure of the optical fiber can be changed only by adjusting the parameters of the air holes in the cross section of the photonic crystal fiber, and therefore the dispersion is adjusted.
Description
Technical field
The invention belongs to optics Terahertz transmission technology, be specifically related to a kind of THz wave transmission and communication system in as light transmission path by the optical fiber preferentially used.
Background technology
THz wave is arranged in (electromagnetic wave spectrum) between electromagnetic wave spectrum microwave and far infrared wave, the molecule rotation of many objects and vibrational energy level are all in Terahertz spectral range, and therefore tera-hertz spectra can be sought peace as material list the important means of fingerprint identification.In addition, THz wave has moderate beam angle, wide spectral bandwidth and large Doppler shift, therefore in broadband wireless communications, space communtication and Precise imaging, has important using value, will become the important means of high-speed radiocommunication of future generation.The advantage of THz wave high-resolution imaging and high-penetrability makes it in radar, safety check etc., have epochmaking using value.Because THz wave decays very large in humid air, and common waveguide cannot realize and distortionless transmission harmless to THz wave, therefore, low-loss, low dispersion, the active demand that the flexible and research with the Terahertz transmission waveguide of certain power capacity, technology and correlation function device becomes Terahertz science and technology and application development thereof is used.
THz wave transmitting procedure in the waveguide has carried out a large amount of tentative research, the metal wire waveguide formed as metal material, metal tube waveguide and the sapphire fiber be made up of dielectric material, plastic optical fiber and photonic crystal fiber and sub-wavelength porous optical fiber etc.THz wave is transmitted in the air of metal waveguide outside metal, therefore poor to the limitation capability of mould field, and bending loss is higher.THz wave is limited in dielectric material by Medium Wave Guide, and loss is higher.The airport with wavelength dimension is carried out periodic arrangement by terahertz light photonic crystal fiber, realizes the transmission to THz wave.According to the difference of photonic crystals optical fiber structure, terahertz light photonic crystal fiber can be divided into two kinds; One is fiber optic hub is high refractive index medium material, the photonic crystal fiber broader bandwidth of this structure, and loss is relatively large; The second fiber optic hub is airport structure, and this photonic crystal fiber adopts photonic band gap effect transmission THz wave, and loss is relatively low, but can only realize narrow band terahertz band wave transmission.But guarantor's bias of Terahertz polarization maintaining optical fibres all at present, low dispersion and low-loss can only realize in a certain specific wavelength or very narrow spectral range, and distortionless transmission harmless to broadband terahertz pulse therefore cannot be realized.
Photonic crystal fiber can provide very high mode birefringence by special structural design, thus realizes protecting partially, the even optical fiber of monomode single-polarization.The mode birefringence that photonic crystal fiber provides can reach 10 usually
-3the order of magnitude is even higher.In terahertz time-domain spectrum systems and terahertz imaging system, Terahertz receiver has Polarization-Sensitive characteristic usually, therefore how to realize that there is broadband and protect inclined Hz optical fiber and waveguide device, of crucial importance for the terahertz time-domain frequency spectrum and imaging system realizing integrability.
Summary of the invention
For solving the problem cannot transmitted in polarization maintaining optical fibre of background technology middle width strip terahertz pulse, the invention provides a kind of oval airport photonic crystal fiber based on hexagonal lattice and protecting partially to realize broadband THz wave.
Technical solution of the present invention is as follows:
Broadband THz wave protects inclined Transmission Fibers, comprise fibre core and covering, its special character is: in described covering, fiber length is provided with multiple oval airport, described multiple oval airport is along its long axis direction arrangement in a row, the major axis of each oval airport is 160 μm, minor axis is 80 μm, oval airport is 200 μm along the spacing of long axis direction, the smallest triangle that the line of centres of three oval airports of adjacent rows is formed is equilateral triangle, the line of centres of outermost oval airport is regular hexagon, often go oval airport two ends each inside indentation equal numbers oval airport after formed the line of centres of outermost oval airport still in regular hexagon, the center superposition of described orthohexagonal center and fibre core, be positioned at regular hexagon center and have two oval airport vacancies, the both sides up and down of vacant locations are provided with two air-discharging circular holes, described two air-discharging circular holes are positioned at the regular hexagon of inner side, the radius of described air circular hole is 20 μm, the spacing being positioned at the air circular hole of colleague is 80 μm, the spacing of two line space gas circular holes is 190 μm, and the region between described two line space gas circular holes is the fibre core of optical fiber, and the radius of described optical fiber is 1450 μm.
The material of above-mentioned optical fiber is tygon or teflon.
Broadband THz wave protects inclined Transmission Fibers, comprise fibre core and covering, its special character is: in described covering, fiber length is provided with multiple diamond shaped air hole, described multiple diamond shaped air hole is along its long axis direction arrangement in a row, the major axis in each diamond shaped air hole is 160 μm, minor axis is 80 μm, diamond shaped air hole is 200 μm along the spacing of long axis direction, the smallest triangle that the line of centres in three diamond shaped air holes of adjacent rows is formed is equilateral triangle, the line of centres in outermost diamond shaped air hole is regular hexagon, the line of centres in the outermost diamond shaped air hole formed behind the diamond shaped air hole of the every each inside indentation equal number in two ends, row diamond shaped air hole still in regular hexagon, the center superposition of described orthohexagonal center and fibre core, be positioned at regular hexagon center and have two diamond shaped air hole vacancies, the both sides up and down of vacant locations are provided with two air-discharging circular holes, described two air-discharging circular holes are positioned at the regular hexagon of inner side, the radius of described air circular hole is 20 μm, the spacing being positioned at the air circular hole of colleague is 80 μm, the spacing of two line space gas circular holes is 190 μm, and the region between described two line space gas circular holes is the fibre core of optical fiber, and the radius of described optical fiber is 1450 μm.
The material of above-mentioned optical fiber is tygon or teflon.
Compared with prior art, advantage is in the present invention:
1, broadband of the present invention THz wave protects inclined Transmission Fibers, oval airport or diamond shaped air hole are joined in fibre cladding, make the mode distributions of TE and TM two-mode different in very wide spectral range, thus there is different effective conversion rates, produce high birefringence, introduce the symmetry that the circular airport of two rows carrys out change structure at the center of optical fiber simultaneously, improve the birefringence of optical fiber, regulate the dispersion of optical fiber, thus inclined terahertz light photonic crystal fiber is protected in the low dispersion realizing broadband, photonic crystal fiber birefringence value can reach 10
-3, even 10
-2, an order of magnitude at least higher than traditional polarization maintaining optical fibre, and in very wide spectral range, there is very low dispersion and dispersion curve is smooth, the undistorted transmission for broadband terahertz pulse is extremely important.In addition, just can change the structure of optical fiber by the parameter of airport on adjustment photonic crystal fiber xsect, thus obtain the adjustment to dispersion.
2. temperature stability is good.Broadband high birefringence low dispersion terahertz light photonic crystal fiber designed by the present invention makes with polymeric material tygon, the birefringence produced in photonic crystal fiber belongs to geometry birefringence, it relies on the asymmetric of optical fiber structure, thus to cause in optical fiber two vertical polarization states to have different propagation constants and equivalent refractive index and form dielectric grid, therefore temperature variation is not obvious on the impact of birefringence value.
3. capability of resistance to radiation is strong.Making traditional polarization maintaining optical fibre material used is generally quartz material, and the fibre core of optical fiber is usually doped with GeO
2, thus under causing nuclear radiation situation, the loss of optical fiber can increase, and makes the capability of resistance to radiation of optical fiber low; Broadband high birefringence low dispersion terahertz light photonic crystal fiber designed by the present invention, its covering and fibre core are made up of polytetrafluoroethylmaterial material of the same race, and capability of resistance to radiation is strong, stable performance.
accompanying drawing explanation
Fig. 1 is Terahertz broadband polarization maintaining optical fibre structural drawing;
Level (x polarized) and vertically effective conversion rate of (y polarized) polarization mode and birefringence curve in Fig. 2 photonic crystal fiber;
The dispersion curve of level (x polarized) and vertical (y polarized) polarization mode in Fig. 3 photonic crystal fiber;
The damage curve of level (x polarized) and vertical (y polarized) polarization mode in Fig. 4 photonic crystal fiber.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated:
As shown in Figure 1, optical fiber comprises covering and fibre core.In Transmission Fibers, fiber length is provided with multiple airport, the shape of airport is rhombus or ellipse, airport is periodic arrangement in optical fiber base material, there are two airport defects at center, and introduce at the vertical direction of defect the symmetry that the circular airport of two rows carrys out change structure, improve the birefringence of optical fiber, regulate the dispersion of optical fiber, thus inclined terahertz light photonic crystal fiber is protected in the low dispersion realizing broadband.Region between two line space gas circular holes is the fibre core of optical fiber, and remainder is covering, and covering is the perimeter surrounding fibre core.The center of three often adjacent airports is the summit of an equilateral triangle, peripheral airport center can connect into the multiple regular hexagons centered by the center of fibre core respectively according to the distance apart from fibre core, the longer axis parallel of oval airport or a vertical and orthohexagonal limit, and all oval airport long axis directions are consistent, oval airport is with the center of fibre core for initial point, and major and minor axis direction is symmetric with rectangular coordinate system transverse and longitudinal axle.
As shown in Figure 1, broadband of the present invention high birefringence low dispersion terahertz light photonic crystal fiber forms with polytetrafluoroethylmaterial material, conversion rate at 0.5THz place is 1.5, absorption loss is 0.3/cm, air part forms regular hexagon structure by oval airport, it is 160 μm and 80 μm that center has two airport defects to form the oval airport major and minor axis of fibre core, middle two-layer roundlet airport radius is 20 μm, spacing ∧ between oval airport is 200 μm, spacing between circle airport ∧ r is 80 μm, the spacing of two line space gas circular holes is 190 μm, the radius of whole optical fiber is 1450 μm.
Its birefringence value of broadband of the present invention high birefringence low dispersion terahertz light photonic crystal fiber can reach 10 in 0.1THz to 4THz scope
-3, can 10 be reached in 0.8THz to 4THz scope
-2.The dispersion of optical fiber of the present invention is close to zero in 0.1THz to 4THz scope, and dispersion curve is smooth, reaches the requirement of the low dispersion of broadband high birefringence.
In photonic crystal fiber, effective conversion rate of level (x polarized) and vertical (y polarized) polarization mode increases with the increase of transmission frequency as shown in Figure 2, when transmission frequency is greater than 3THz, effective conversion rate remains unchanged substantially.Birefringence value can reach 10 in 0.1THz to 4THz scope
-3, can 10 be reached in 0.8THz to 4THz scope
-2.
In 0.1THz to 4THz scope, in photonic crystal fiber, the dispersion values of level (x polarized) and vertical (y polarized) polarization mode floats less close to zero as shown in Figure 3, and dispersion curve is smooth.In 0.1THz to 4THz (30 μm to 3000 μm) scope, in photonic crystal fiber, the loss of level (x polarized) and vertical (y polarized) polarization mode reduces with the reduction (wavelength increase) of frequency, and minimal losses is 0.08dB/m.
Claims (4)
1. broadband THz wave protects inclined Transmission Fibers, comprise fibre core and covering, it is characterized in that: in described covering, fiber length is provided with multiple oval airport, described multiple oval airport is along its long axis direction arrangement in a row, the major axis of each oval airport is 160 μm, minor axis is 80 μm, oval airport is 200 μm along the spacing of long axis direction, the smallest triangle that the line of centres of three oval airports of adjacent rows is formed is equilateral triangle, the line of centres of outermost oval airport is regular hexagon, often go oval airport two ends each inside indentation equal numbers oval airport after formed the line of centres of outermost oval airport still in regular hexagon, the center superposition of described orthohexagonal center and fibre core, be positioned at regular hexagon center and have two oval airport vacancies, the both sides up and down of vacant locations are provided with two air-discharging circular holes, described two air-discharging circular holes are positioned at the regular hexagon of inner side, the radius of described air circular hole is 20 μm, the spacing being positioned at the air circular hole of colleague is 80 μm, the spacing of two line space gas circular holes is 190 μm, and the region between described two line space gas circular holes is the fibre core of optical fiber, and the radius of described optical fiber is 1450 μm.
2. broadband according to claim 1 THz wave protects inclined Transmission Fibers, it is characterized in that: the material of described optical fiber is tygon or teflon.
3. broadband THz wave protects inclined Transmission Fibers, comprise fibre core and covering, it is characterized in that: in described covering, fiber length is provided with multiple diamond shaped air hole, described multiple diamond shaped air hole is along its long axis direction arrangement in a row, the major axis in each diamond shaped air hole is 160 μm, minor axis is 80 μm, diamond shaped air hole is 200 μm along the spacing of long axis direction, the smallest triangle that the line of centres in three diamond shaped air holes of adjacent rows is formed is equilateral triangle, the line of centres in outermost diamond shaped air hole is regular hexagon, the line of centres in the outermost diamond shaped air hole formed behind the diamond shaped air hole of the every each inside indentation equal number in two ends, row diamond shaped air hole still in regular hexagon, the center superposition of described orthohexagonal center and fibre core, be positioned at regular hexagon center and have two diamond shaped air hole vacancies, the both sides up and down of vacant locations are provided with two air-discharging circular holes, described two air-discharging circular holes are positioned at the regular hexagon of inner side, the radius of described air circular hole is 20 μm, the spacing being positioned at the air circular hole of colleague is 80 μm, the spacing of two line space gas circular holes is 190 μm, and the region between described two line space gas circular holes is the fibre core of optical fiber, and the radius of described optical fiber is 1450 μm.
4. broadband according to claim 3 THz wave protects inclined Transmission Fibers, it is characterized in that: the material of described optical fiber is tygon or teflon.
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Cited By (6)
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|---|---|---|---|---|
| CN104808285A (en) * | 2015-04-15 | 2015-07-29 | 南京邮电大学 | High double-refraction chromatic dispersion adjustable pohotonic crystal fiber |
| CN106054312A (en) * | 2016-08-15 | 2016-10-26 | 中国工程物理研究院激光聚变研究中心 | High-birefringence low-loss pohotonic crystal fiber |
| CN108152881A (en) * | 2018-01-26 | 2018-06-12 | 西安邮电大学 | A kind of sulphur system high double-refraction photon crystal fiber in the range of 2 to 5 micron waveband |
| CN108490534A (en) * | 2018-05-24 | 2018-09-04 | 重庆邮电大学 | A kind of temperature-insensitive Polarization filter based on circular hole mixed type microstructured optical fibers |
| CN112928417A (en) * | 2021-03-11 | 2021-06-08 | 南通大学 | Porous sub-terahertz dielectric waveguide transmission line |
| CN113376735A (en) * | 2021-06-29 | 2021-09-10 | 西安邮电大学 | quasi-Chinese knot type porous fiber core ultrahigh birefringence terahertz optical fiber |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808285A (en) * | 2015-04-15 | 2015-07-29 | 南京邮电大学 | High double-refraction chromatic dispersion adjustable pohotonic crystal fiber |
| CN104808285B (en) * | 2015-04-15 | 2017-08-01 | 南京邮电大学 | A kind of high birefringence dispersion-tunable photonic crystal fiber |
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| CN108152881A (en) * | 2018-01-26 | 2018-06-12 | 西安邮电大学 | A kind of sulphur system high double-refraction photon crystal fiber in the range of 2 to 5 micron waveband |
| CN108152881B (en) * | 2018-01-26 | 2020-01-07 | 西安邮电大学 | Chalcogenide high-birefringence photonic crystal fiber in waveband range of 2-5 microns |
| CN108490534A (en) * | 2018-05-24 | 2018-09-04 | 重庆邮电大学 | A kind of temperature-insensitive Polarization filter based on circular hole mixed type microstructured optical fibers |
| CN108490534B (en) * | 2018-05-24 | 2020-03-17 | 重庆邮电大学 | Temperature-insensitive polarization filter based on round hole mixed type microstructure optical fiber |
| CN112928417A (en) * | 2021-03-11 | 2021-06-08 | 南通大学 | Porous sub-terahertz dielectric waveguide transmission line |
| CN113376735A (en) * | 2021-06-29 | 2021-09-10 | 西安邮电大学 | quasi-Chinese knot type porous fiber core ultrahigh birefringence terahertz optical fiber |
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