Widely tunable LP_11 cladding-mode resonance in a twisted mechanically induced long-period fiber grating

2015 ◽  
Vol 54 (8) ◽  
pp. 2007 ◽  
Author(s):  
Anitha S. Nair ◽  
V. P. Sudeep Kumar ◽  
Hubert Joe
Keyword(s):  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

CO2 laser-written long-period fiber grating with a high diffractive order cladding mode near the turning point

2018 ◽  
Vol 57 (17) ◽  
pp. 4756 ◽  
Author(s):  
Zuyao Liu ◽  
Yunqi Liu ◽  
Chengbo Mou ◽  
Fang Zou ◽  
Tingyun Wang
Keyword(s):  
Co2 Laser ◽  
Turning Point ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

scholarly journals Realization of Enhanced Evanescent Field Long Period Fiber Grating near Turn around Point for Label-Free Immunosensing

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 9
Author(s):  
Tanoy Kumar Dey ◽  
Sara Tombelli ◽  
Palas Biswas ◽  
Ambra Giannetti ◽  
Nandini Basumallick ◽  
...  
Keyword(s):  
Immunoglobulin G ◽  
Flow Cell ◽  
Evanescent Field ◽  
Fiber Grating ◽  
Label Free ◽  
Maximum Enhancement ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

A long-period fiber grating (LPFG) with maximum enhancement of evanescent field has been designed and fabricated, along with theoretical modeling, by working near the turn-around point (TAP) of the lowest order symmetric cladding mode (LP0.2 cladding mode). The LPFG was fabricated using a point-by-point inscription technique and it was characterized in terms of surrounding refractive index (SRI) within the range of 1.333 to 1.3335 using a thermostated flow-cell. This closed cell, made of poly(methyl methacrylate) (PMMA), was designed for better handling of the sensor, because during the fabrication process, the diameter of the LPFG was reduced up to ~20 µm by chemical etching, for the maximum enhancement of the evanescent field. The sensitivity of dual peak resonance of the LP0.2 cladding mode near TAP was measured and resulted to be ~8751 nm/SRIU with a resolution of the order of 10−5 RIU. The sensor was further used for the label-free immunosensing application by the implementation of Immunoglobulin G (IgG)/anti-Immunoglobulin G (anti-IgG) bioassay in human serum on the grating region inside the thermostated closed flow cell.

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.

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