Bragg reflection and conversion between helical Bloch modes in twisted three-core optical fiber

2019 ◽  
Author(s):  
Sébastien Loranger ◽  
Yang Chen ◽  
Paul Roth ◽  
Michael H. Frosz ◽  
Goran Ahmed ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Bragg Reflection ◽  
Bloch Modes

scholarly journals Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of Fiber Bragg Grating Inscribed Radiation-Resistant Optical Fiber

2019 ◽  
Vol 10 (1) ◽  
pp. 16-33 ◽  
Author(s):  
Seongmin Ju ◽  
Youngwoong Kim ◽  
Kadathala Linganna ◽  
Yune Hyoun Kim ◽  
Won-Taek Han
Keyword(s):  
Optical Fiber ◽  
Total Dose ◽  
Silica Glass ◽  
Bragg Reflection ◽  
Effect Of Temperature ◽  
Wavelength Shift ◽  
Optical Attenuation ◽  
Boron Doped ◽  
Radiation Induced ◽  
Γ Ray

Abstract A new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding was fabricated for temperature sensor application based on the fiber Bragg grating (FBG) under γ-ray irradiation environment. The temperature dependences of optical attenuation at 1550.5 nm and Bragg reflection wavelength shift from 18 °C to 40 °C before the γ-ray irradiation were about 4.57×10−4 dB/ °C and 5.48 pm/ °C, respectively. The radiation-induced optical attenuation at 1550.5 nm and the radiation-induced Bragg reflection wavelength shift under the γ-ray irradiation with the total dose of 22.85kGy at 35 °C were about 0.03dB/m and 0.12nm, respectively, with the γ-ray irradiation sensitivity of 5.25×10−3 pm/Gy. The temperature and the γ-ray irradiation dependence of optical attenuation at 1550.5nm in the FBG written fiber with boron-doped silica glass inner cladding were about 6 times and 4 times lower than that in the FBG written fiber without boron-doped silica glass inner cladding under a temperature change from 18 °C to 40 °C and the γ-ray irradiation with the total dose of 22.85 kGy at 35 °C, respectively. Furthermore, the effect of temperature increase on the Bragg reflection wavelength of the FBG written fiber with boron-doped silica inner cladding was much larger about 1000 times than that of the γ-ray irradiation. However, no influence on the reflection power of the Bragg wavelengths and the full width at half maximum (FWHM) bandwidth under temperature and the γ-ray irradiation change was found. Also, after the γ-ray irradiation with the dose of 22.85kGy, no significant change in the refractive index was found but the residual stresses developed in the fiber were slightly relaxed or retained.

scholarly journals Experimental Analysis of Bragg Reflection Peak Splitting in Gratings Fabricated Using a Multiple Order Phase Mask

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 433
Author(s):  
Gabriela Statkiewicz-Barabach ◽  
Karol Tarnowski ◽  
Dominik Kowal ◽  
Pawel Mergo
Keyword(s):  
Optical Fiber ◽  
Experimental Analysis ◽  
Bragg Reflection ◽  
Theoretical Data ◽  
Phase Mask ◽  
Bragg Grating ◽  
Reflection Spectra ◽  
Polymer Optical Fiber ◽  
Peak Splitting ◽  
Reflection Peak

We performed an experimental analysis of the effect of phase mask alignment on the Bragg grating reflection spectra around the wavelength of λB = 1560 nm fabricated in polymer optical fiber by using a multiple order phase mask. We monitored the evolution of the reflection spectra for different values of the angle ϕ by describing the tilt between the phase mask and the fiber. We observed that the peak at λB is split into five separate peaks for the nonzero tilt and that separation of the peaks increases linearly with ϕ. Through comparison with theoretical data we were able to identify the five peaks as products of different grating periodicities, which are associated with the interference of different pairs of diffraction orders on the phase mask.

scholarly journals Bragg reflection and conversion between helical Bloch modes in chiral three-core photonic crystal fiber

2020 ◽  
pp. 1-1
Author(s):  
Sebastien Loranger ◽  
Yang Chen ◽  
Paul Roth ◽  
Michael Frosz ◽  
G. K. L. Wong ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Bragg Reflection ◽  
Crystal Fiber ◽  
Bloch Modes

Bending loss formulas for step-index optical fiber and their applicable regions

1981 ◽  
Vol 64 (10) ◽  
pp. 95-103
Author(s):  
Kiyonobu Kusano ◽  
Shigeo Nishida
Keyword(s):  
Optical Fiber ◽  
Step Index ◽  
Bending Loss

Powder Transport by Surface Acoustic Wave Actuator using Bragg Reflection

2014 ◽  
Vol 134 (12) ◽  
pp. 1934-1935
Author(s):  
Tsunemasa Saiki ◽  
Yuya Matsui ◽  
Yasuto Arisue ◽  
Yuichi Utsumi ◽  
Akinobu Yamaguchi
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Bragg Reflection
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