scholarly journals Long-Period Fiber Grating Analysis Using Generalized N×N Coupled-Mode Theory by Section-Wise Discretization

1999 ◽  
Vol 3 (2) ◽  
pp. 55-63 ◽  
Author(s):  
Yoon-Chan Jeong ◽  
Byoung-Ho Lee
Keyword(s):  
Coupled Mode Theory ◽  
Fiber Grating ◽  
Mode Theory ◽  
Coupled Mode ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Intensity dependent spectral properties of long-period fiber grating for applications in lightwave communication

2019 ◽  
Vol 28 (02) ◽  
pp. 1950010
Author(s):  
Vishal Jain ◽  
Santosh Pawar ◽  
Shubhada Kumbhaj ◽  
Pranay Kumar Sen
Keyword(s):  
Spectral Properties ◽  
Resonance Wavelength ◽  
Optical Nonlinearity ◽  
Excitation Intensity ◽  
Fiber Grating ◽  
Coupled Mode ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

Using nonlinear coupled mode equations, the spectral properties of long-period fiber grating are studied analytically taking into account the Kerr type optical nonlinearity in the medium. The nonlinear coupled-mode equations were solved for co-propagating core and cladding mode amplitudes and expressions for transmittivity and phase factor at high excitation intensity are obtained. It is observed that the resonance wavelength of grating shifts towards higher wavelength side with increasing excitation intensity. Also, the minimum transmittivity of the grating shows oscillating behavior with increasing grating length, whereas the phase of the transmitted wave increases monotonically with length at high input intensities.

scholarly journals Simulation of the Transmission Spectrum of Long-Period Fiber Gratings Structures with a Propagating Acoustic Shock Front

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7212
Author(s):  
Oleg V. Ivanov ◽  
Paulo Caldas ◽  
Gaspar Rego
Keyword(s):  
Shock Front ◽  
Transmission Spectrum ◽  
Fiber Grating ◽  
Modulation Amplitude ◽  
Fiber Gratings ◽  
Coupled Mode ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Period Fiber Grating

In this paper, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber. We simulate transmission through inhomogeneous long-period fiber gratings, π-shift and reflective π-shift gratings deformed by an acoustic shock front. Coupled mode equations describing interaction of co-propagating modes in a long-period fiber grating structures with inhomogeneous deformation are used for the simulation. Two types of apodization are considered for the grating modulation amplitude, such as uniform and raised-cosine. We demonstrate how the transmission spectrum is produced by interference between the core and cladding modes coupled at several parts of the gratings having different periods. For the π-shift long-period fiber grating having split spectral notch, the gap between the two dips becomes several times wider in the grating with the acoustic wave front than the gap in the unstrained grating. The behavior of reflective long-period fiber gratings depends on the magnitude of the phase shift near the reflective surface: an additional dip is formed in the 0-shift grating and the short-wavelength dip disappears in the π-shift grating.

scholarly journals Coupled Mode Characteristics From the Perturbation of 3D Printed Long-Period Fiber Grating Devices

2020 ◽  
Vol 10 (3) ◽  
pp. 195-203 ◽  
Author(s):  
Ravivudh Khun-In ◽  
Yuji Usuda ◽  
Yuttapong Jiraraksopakun ◽  
Apichai Bhatranand ◽  
Hideki Yokoi
Keyword(s):  
Fiber Grating ◽  
Coupled Mode ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
3D Printed ◽  
Mode Characteristics ◽  
Period Fiber Grating

Power-Type Liquid-Level Sensor for High Refractive Index Liquid Based on Long-Period Fiber Grating

2021 ◽  
pp. 112652
Author(s):  
Ming Zhang ◽  
Zhangjun Hu ◽  
Xiao Wang ◽  
Linlin Xue ◽  
Jun Zou ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Liquid Level ◽  
Fiber Grating ◽  
Power Type ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Level Sensor ◽  
Period Fiber Grating ◽  
Liquid Level Sensor

Fiber strain sensor based on incline plane-shaped long period fiber grating induced by CO2 laser polishing

2021 ◽  
pp. 1-1
Author(s):  
Yiwei Ma ◽  
Jing Sun ◽  
Senyu Wang ◽  
Xiaoyang Li ◽  
Yunxiang Yan ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Incline Plane ◽  
Strain Sensor ◽  
Fiber Grating ◽  
Laser Polishing ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG)

2021 ◽  
pp. 1-11
Author(s):  
Takuya Okazaki ◽  
Tatsuya Orii ◽  
Shin-Yinn Tan ◽  
Tomoaki Watanabe ◽  
Akira Taguchi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Nanocrystalline Cu-doped zirconia film-coated long-period fiber grating for CO monitoring at high temperature

2009 ◽  
Author(s):  
Xiling Tang ◽  
Jian Zhang ◽  
Junhang Dong ◽  
Tao Wei ◽  
Hai Xiao
Keyword(s):  
High Temperature ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Zirconia Film ◽  
Period Fiber Grating

A sensitive ammonia sensor using long period fiber grating coated with graphene oxide/cellulose acetate

2021 ◽  
pp. 1-1
Author(s):  
Bing Xu ◽  
Jun Huang ◽  
Liyun Ding ◽  
Hao Zhang ◽  
Haowen Zhanga
Keyword(s):  
Graphene Oxide ◽  
Cellulose Acetate ◽  
Fiber Grating ◽  
Ammonia Sensor ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating
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