High extinction ratio elliptical core Panda-type polarization-maintaining fiber coil

2021 ◽  
Author(s):  
Haoyu Li ◽  
Xuyou Li ◽  
Jie Wang ◽  
Martin Rochette ◽  
Han-Rui Yang
Keyword(s):  
Extinction Ratio ◽  
High Extinction Ratio ◽  
Polarization Maintaining Fiber ◽  
Elliptical Core ◽  
Polarization Maintaining ◽  
Fiber Coil

scholarly journals Group-Birefringence-Dispersion Measurements for Polarization-Maintaining Fibers Using a Kerr Phase-Interrogator

2020 ◽  
Vol 10 (24) ◽  
pp. 9031
Author(s):  
Yang Lu
Keyword(s):  
Group Delay ◽  
Laser Wavelength ◽  
Differential Group Delay ◽  
Optical Signals ◽  
Differential Group ◽  
Principal Axes ◽  
Polarization Maintaining Fiber ◽  
Elliptical Core ◽  
Polarization Maintaining ◽  
The Impact

A method which utilizes a Kerr phase-interrogator to measure the group birefringence dispersion (GBD) of a polarization-maintaining fiber (PMF) is systematically studied in this paper. The differential group delay of two sinusoidally modulated optical signals (SMOSs) polarized along the principal axes of the PMF is measured by a Kerr phase-interrogator, which leads to the group birefringence of the PMF. As the laser wavelength of the SMOSs varies, the group birefringence as a function of the laser wavelength is obtained, and the GBD is calculated as the derivative of the group birefringence with respect to the laser wavelength. The proposed method is experimentally demonstrated by characterizations of a Panda PMF with high GBD and an elliptical core PMF with low GBD, and its performance is analyzed. The proposed method eliminates the impact of the laser coherent length and allows for characterizing the GBD of PMFs that are tens of kilometers long.

scholarly journals Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5440 ◽  
Author(s):  
Xiaopeng Han ◽  
Chunyu Liu ◽  
Shengxu Jiang ◽  
Shuo Leng ◽  
Jiuru Yang
Keyword(s):  
Refractive Index ◽  
Temperature Fluctuation ◽  
Extinction Ratio ◽  
Single Mode ◽  
Zehnder Interferometer ◽  
Structure Parameters ◽  
Refractive Index Sensing ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Mach Zehnder Interferometer

A novel in-fiber Mach-Zehnder interferometer based on cascaded up-down-taper (UDT) structure is proposed by sandwiching a piece of polarization maintaining fiber between two single-mode fibers (SMF) and by utilizing over-fusion splicing method. The dual up tapers respectively act as fiber splitter/combiner, the down taper acts as an optical attenuator. The structure parameters are analyzed and optimized. A larger interference fringe extinction ratio ~15 dB is obtained to achieve refractive index (RI) sensing based on intensity demodulation. The experimental results show that the RI sensitivity is −310.40 dB/RIU with the linearity is improved to 0.99 in the range of 1.3164–1.3444. The corresponding resolution can reach 3.22 × 10−5 RIU, which is 6.8 times higher than wavelength demodulation. The cross sensitivity which caused by temperature fluctuation is less than 1.4 × 10−4.

Research of the coating resin performance of the polarization-maintaining fiber coil

2006 ◽  
Author(s):  
Zhaokui Meng ◽  
Hongfeng Shao ◽  
Hongjie Xu ◽  
Yuanhong Yang
Keyword(s):  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Fiber Coil

scholarly journals Fiber Twist-based Wavelength Tunability in Tapered Optical Fiber Filters

2020 ◽  
Vol 28 (4) ◽  
Author(s):  
Maisarah Mansor ◽  
Afiqah Mohd Nawi ◽  
Nadiah Husseini Zainol Abidin ◽  
Muhammad Firdaus Omar ◽  
Mohd Adzir Mahdi ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Processing System ◽  
Single Mode ◽  
Physical Structure ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Laser Systems ◽  
Polarization Maintaining Fiber ◽  
Tapered Optical Fiber ◽  
Polarization Maintaining

This work demonstrates the tunability of tapered single mode fiber (SMF) and tapered polarization maintaining fiber (PMF) filters based on fiber twisting method. One end of the tapered fiber was twisted from 0o until 100o using the Vytran Fiber Processing System. Observation on the spectral output shows that the fiber twisting technique is a viable option to impart tunability in tapered fibers with total shift of 15 and 10 nm, respectively for SMF and PMF. Better tunability is observed in the SMF filter due to its simple physical structure and more straightforward interferometry effect but a significantly higher extinction ratio is observed for the PMF filter. Both filters exhibited region of linear wavelength shift with corresponding R2 values of 0.9924 and 0.9294 for SMF and PMF. The simplicity and reliability of the filter may pave the way for the development of a practical and compact tunable all-fiber filter for laser systems.

scholarly journals Fiber Ring Laser Directional Torsion Sensor with Ultra-Wide Linear Response

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3613
Author(s):  
Xianjin Liu ◽  
Fengjuan Wang ◽  
Jiuru Yang ◽  
Xudong Zhang ◽  
Xiliang Du
Keyword(s):  
Phase Modulation ◽  
Linear Response ◽  
Extinction Ratio ◽  
Ring Cavity ◽  
Optical Filter ◽  
Fiber Ring ◽  
Highly Sensitive ◽  
Cavity Structure ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

In this paper, a comprehensive passive torsion measurement is performed firstly in a 40-cm-long polarization maintaining fiber-based Sagnac interferometer (PMF-SI), and the non-linear torsion response is found and investigated. Then, a fiber laser torsion sensor (FLTS) with a dual-ring-cavity structure is proposed and experimentally demonstrated, in which the PMF-SI is utilized as the optical filter as well as the sensing unit. In particular, the highly sensitive linear range is adjusted through fine phase modulation, and owing to the flat-top feature of fringes, an ~83.6% sensitivity difference is effectively compressed by the generated lasing. The experimental results show that, without any pre-twisting, the ultra-wide linear response from –175 to 175 rad/m is gained, and the torsion sensitivities are 2.46 and 1.55 nm/rad with high linearity (>0.99) in the clockwise and anti-clockwise directions, respectively. Additionally, a high extinction ratio (>42 dB) and small line-width (~0.14 nm) are obtained in the proposed FLTS, and the corresponding detection limit reaches 0.015 rad/m.

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