共查询到20条相似文献,搜索用时 0 毫秒
1.
Pan Ma Ningfang Song Jing Jin Jingming Song Xiaobin Xu 《Optics & Laser Technology》2012,44(6):1829-1833
In this paper, we investigate the birefringence of polarization maintaining photonic crystal fibers (PM-PCFs) under thermal effect. Modeling and simulation of PM-PCFs under thermal effect are conducted. Birefringence in a PM-PCF as a function of the temperature is measured experimentally. The experimental results are in agreement with theoretical calculation, and show that the relative temperature dependent birefringence coefficient of the PM-PCF, dΔn/dT/Δn, is 2.93×10?5/°C, which is typically ~35 times less than that of conventional panda fibers. The insensitivity of polarization properties in PM-PCFs to temperature is demonstrated. These findings have important benefits in fiber optic systems and sensors, especially in fiber optic gyroscopes (FOG) where it translates into a lower polarization error and thus a higher measurement precision. 相似文献
2.
T. Martynkien A. Anuszkiewicz G. Statkiewicz-Barabach J. Olszewski G. Golojuch M. Szczurowski W. Urbanczyk J. Wojcik P. Mergo M. Makara T. Nasilowski F. Berghmans H. Thienpont 《Applied physics. B, Lasers and optics》2009,94(4):635-640
We designed, fabricated, and characterized birefringent holey fibers with zero polarimetric sensitivity to temperature. The
sensitivity measurements were carried out in a wide spectral range of 0.68–1.55 μm in fibers with different hole and pitch
values and with birefringence induced by a pair of large holes adjacent to the core. Our results show that zero sensitivity
to temperature can be obtained at certain wavelengths for the bare fibers with properly adjusted geometrical parameters. Moreover,
the spectral measurements of the sensitivity to temperature are in good agreement with the modeling results for all the investigated
fibers. 相似文献
3.
We propose and demonstrate hydrophobic photonic crystal fibers (PCFs). A chemical surface treatment for making PCFs hydrophobic is introduced. This repels water from the holes of PCFs, so that their optical properties remain unchanged even when they are immersed in water. The combination of a hollow core and a water-repellent inner surface of the hydrophobic PCF provides an ultracompact dissolved-gas sensor element, which is demonstrated for the sensing of dissolved ammonia gas. 相似文献
4.
Elliptical-hole photonic crystal fibers 总被引:9,自引:0,他引:9
We study the dispersive properties of photonic crystal fibers (PCF's) with elliptical air holes. The unusual guidance of PCF leads to novel behavior of the birefringence, group-velocity walk-off, and dispersion parameters, including the possibility of zero walk-off with high birefringence in the single-mode regime. A number of these effects are closely tied to the underlying radiation states of the air-hole lattice. 相似文献
5.
All-solid silica-based photonic crystal fibers 总被引:1,自引:0,他引:1
Ming-Yang Chen 《Optics Communications》2006,266(1):151-158
An index-guiding all-solid photonic crystal fiber (PCF) composed entirely of silica material is proposed in this paper. The core of this optical fiber is composed of pure silica, and the cladding consists of doped silica rod in the background of pure silica. The dependence of confinement loss on the diameter of the doped rods, the number of doped-rod rings, and the doping level is investigated numerically. In addition, the proposed fiber possesses a shorter cutoff wavelength as compared with the air/silica PCF, which is directly confirmed by the V parameter, and explained based on a scalar approximation method. Furthermore, the bending loss for the fiber is predicted. A low-loss single-mode all-solid silica-based PCF with a large-mode-area is possible by the appropriate selection of configuration parameters. 相似文献
6.
Highly birefringent photonic crystal fibers 总被引:46,自引:0,他引:46
Ortigosa-Blanch A Knight JC Wadsworth WJ Arriaga J Mangan BJ Birks TA Russell PS 《Optics letters》2000,25(18):1325-1327
We report a strongly anisotropic photonic crystal fiber. Twofold rotational symmetry was introduced into a single-mode fiber structure by creation of a regular array of airholes of two sizes disposed about a pure-silica core. Based on spectral measurements of the polarization mode beating, we estimate that the fiber has a beat length of approximately 0.4 mm at a wavelength of 1540 nm, in good agreement with the results of modeling. 相似文献
7.
8.
The tomographic reconstruction of the refractive index distribution in a large-mode-area photonic fiber is presented. The results of the diffraction tomographic algorithm and classical filtered backprojection method are compared. Additionally, the application of the synthetic aperture technique to tomographic interferometry, as a tool for resolution enhancement, is presented and discussed. 相似文献
9.
Splice-free interfacing of photonic crystal fibers 总被引:2,自引:0,他引:2
Leon-Saval SG Birks TA Joly NY George AK Wadsworth WJ Kakarantzas G Russell PS 《Optics letters》2005,30(13):1629-1631
We report a new method for making low-loss interfaces between conventional single-mode fibers and photonic crystal fibers (PCFs). Adapted from the fabrication of PCF preforms from stacked tubes and rods, this method avoids the need for splicing and is versatile enough to interface to virtually any type of index-guiding silica PCF. We illustrate the method by forming interfaces to two problematic types of PCF, highly nonlinear and multicore. In particular, we believe this to be the first method capable of individually coupling light into and out of all the cores of a fiber with multiple closely spaced cores, without input or output cross talk. 相似文献
10.
Group-velocity dispersion in photonic crystal fibers 总被引:12,自引:0,他引:12
The dispersion properties of photonic crystal fibers are calculated by expression of the modal field as a sum of localized orthogonal functions. Even simple designs of these fibers can yield zero dispersion at wavelengths shorter than 1.27 mum when the fibers are single mode, or a large normal dispersion that is suitable for dispersion compensation at 1.55 mum. 相似文献
11.
O. Frazo J.L. Santos F.M. Araújo L.A. Ferreira 《Laser \u0026amp; Photonics Reviews》2008,2(6):449-459
A review of optical fiber sensing demonstrations based on photonic crystal fibers is presented. The text is organized in five main sections: the first three deal with sensing approaches relying on fiber Bragg gratings, long‐period gratings and interferometric structures; the fourth one reports applications of these fibers for gas and liquid sensing; finally, the last section focuses on the exploitation of nonlinear effects in photonic crystal fibers for sensing. 相似文献
12.
J. Milanovic J. Heersink Ch. Marquardt A. Huck U. L. Andersen G. Leuchs 《Laser Physics》2007,17(4):559-566
We report on the generation of polarization squeezing by employing intense, ultrashort light pulses in a single pass method
in photonic crystal fibers. We investigated the squeezing behavior near the zero-dispersion wavelength and in the anomalous
dispersion regime by using two distinct fibers. We observed a maximal squeezing at 810 nm of −3.3 ± 0.3 dB with an excess
noise of +16.8 ± 0.3 dB in the anomalous regime. Correcting for linear and interference losses between the polarization modes,
this corresponds to −6 ± 1 dB. The ratio of squeezing to excess noise indicates the creation of a much purer state; this ratio
indeed lies an order of magnitude below those squeezing experiments that exploit traditional fibers [1]. We attribute this
increased state of purity to increased effective nonlinearity and to the reduction of scattering on acoustic modes in the
fiber.
Original Text ? Astro, Ltd., 2007. 相似文献
13.
Introduction to nonlinear photonic crystal fibers 总被引:1,自引:0,他引:1
Kim P. Hansen 《Journal of Optical and Fiber Communications Reports》2005,2(3):226-254
14.
15.
All-glass endless single-mode photonic crystal fibers 总被引:1,自引:0,他引:1
Endless single-mode fibers, which remain single mode over their entire range of guidance, are, to the best of our knowledge, the first reported unique application of photonic crystal fibers. These endless single-mode fibers are made by omitting a single air hole in a periodic array of small air holes in a background silica glass. The feasibility of all-glass endless single-mode photonic crystal fibers where the air holes are replaced by a glass with vanishingly small refractive index contrast relative to silica is first studied theoretically and then demonstrated experimentally. This new all-glass design enables not only ease and consistency of fabrication but also the convenience to be handled and spliced like conventional fibers. 相似文献
16.
We reported on the supermode selection of total-internal-reflection photonic crystal fibers (PCFs) with linearly and circularly distributed multicores. The supermode characteristics were investigated using a full-vector finite-element method (FEM). The near and far-field patterns of supermodes supported by the multicore photonic crystal fiber were presented. A Talbot cavity was employed to select the wanted supermode. 相似文献
17.
We propose the realization of single-polarization operation in highly birefringent photonic crystal fibers. The suppression of one of the polarization states is realized by introducing index-matched cladding defect waveguides. The leakage loss of the index-matched polarization state can be enhanced by nearly 4 orders of magnitude. In particular, polarization-dependent loss larger than 2.97 dB/m with transmission loss lower than 0.03 dB/m in a wavelength region ranging from 1.54 to 1.566 microm can be realized in one such fiber. 相似文献
18.
By using a multipole moment approach, we analyze the loss of an air-core photonic crystal fiber and demonstrate that it is possible reduce the transmission loss that is due to photon radiation leakage through the photonic crystal cladding to a level below 0.01 dB/km, with eight rings of air holes. An analogy is drawn between air-core photonic crystal fiber modes and Bragg fiber modes. The influence of material absorption in the silica glass is discussed. 相似文献
19.
Tadeusz Martynkien Marcin Szpulak Gabriela Statkiewicz Grzegorz Golojuch Jacek Olszewski Waclaw Urbanczyk Jan Wojcik Pawel Mergo Mariusz Makara Tomasz Nasilowski Francis Berghmans Hugo Thienpont 《Optical and Quantum Electronics》2007,39(4-6):481-489
We report on experimental studies of polarimetric sensitivity to hydrostatic pressure and temperature in two highly birefringent
index guided photonic crystal fibers, in which birefringence is induced by one row of the cladding holes with diameters smaller
than the other cladding holes. The sensitivity measurements were carried out in the spectral range from 0.6 μm to 1.6 μm.
Our results show that absolute value of the polarimetric sensitivity to hydrostatic pressure can reach 23 rad/MPa × m, which
is almost one order of magnitude higher than in conventional fibers with elliptical core. Simultaneously, polarimetric sensitivity
to temperature is at least two orders of magnitude lower than in conventional highly birefringent fibers. Moreover, we proved
experimentally that one of the investigated fibers is completely insensitive to temperature at certain wavelength. 相似文献
20.
This work is devoted to the study of hollow-core photonic crystal fibers (HCPCF) dispersion properties. An effective scheme
of HCPCF eigenmodes analysis, lying in separate dispersion diagrams calculation for the cladding and for the HCPCF itself,
was proposed. General recommendations concerning selection of proper fiber parameters were given.
The text was submitted by the authors in English. 相似文献