scholarly journals Theoretical analysis and numerical calculation for the transmission spectrum of long-period fiber gratings with a rectangular index modulation

2003 ◽  
Vol 52 (1) ◽  
pp. 96
Author(s):  
Xu Xin Hua ◽  
Cui Yi Ping
Keyword(s):  
Numerical Calculation ◽  
Theoretical Analysis ◽  
Transmission Spectrum ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Index Modulation

A Humidity Sensor Based on Ultra-Long-Period Fiber Gratings with Asymmetric Refractive Index Modulation

2009 ◽  
Vol 36 (8) ◽  
pp. 2042-2045 ◽  
Author(s):  
宋韵 Song Yun ◽  
朱涛 Zhu Tao ◽  
饶云江 Rao Yunjiang ◽  
赵英伟 Zhao Yingwei
Keyword(s):  
Refractive Index ◽  
Humidity Sensor ◽  
Refractive Index Modulation ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Index Modulation

Reduction of transmission spectrum shift of long-period fiber gratings by a UV-preexposure method

2001 ◽  
Vol 19 (8) ◽  
pp. 1221-1228 ◽  
Author(s):  
H. Kawano ◽  
H. Muentz ◽  
Y. Sato ◽  
J. Nishimae ◽  
A. Sugitatsu
Keyword(s):  
Transmission Spectrum ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Spectrum Shift

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.

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