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

3d-printed force sensitive structure using embedded long-period fiber grating

2022 ◽  
Vol 148 ◽  
pp. 107697
Author(s):  
Felipe Oliveira Barino ◽  
Renato Luiz Faraco-Filho ◽  
Deivid Campos ◽  
Alexandre Bessa dos Santos
Keyword(s):  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
3D Printed ◽  
Sensitive Structure ◽  
Period Fiber Grating

Resonant Wavelength Observation by 3D Printed Mechanically Induced Long-Period Fiber Grating Device

2018 ◽  
Author(s):  
Ravivudh Khun-in ◽  
Masahiro Takagi ◽  
Kouya Nanjo ◽  
Yuttapong Jiraraksopakun ◽  
Apichai Bhatranand ◽  
...  
Keyword(s):  
Resonant Wavelength ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
3D Printed ◽  
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.

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