Measurement of refractive-index profile and transmission characteristics of a single-mode optical fiber from its exit-radiation pattern

1979 ◽  
Vol 18 (19) ◽  
pp. 3265 ◽  
Author(s):  
Kazuo Hotate ◽  
Takanori Okoshi
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Radiation Pattern ◽  
Single Mode ◽  
Refractive Index Profile ◽  
Transmission Characteristics ◽  
Index Profile ◽  
Single Mode Optical Fiber

scholarly journals Strain and Curvature Stability Enhanced SMF Introduction

2017 ◽  
Vol 6 (1) ◽  
pp. 63
Author(s):  
S. Makouei
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Design Method ◽  
Single Mode ◽  
Effective Area ◽  
Refractive Index Profile ◽  
Curvature Radius ◽  
Geometrical Parameters ◽  
Small Curvature ◽  
Bending Loss

In this paper, the strain insensitive single mode optical fiber with low nonlinear effects and ultra low bending loss (BL), appropriate for small curvature radius installation, is presented. The suggested design method is based on the reverse engineering which evaluates the refractive index profile considering proper mode field diameter (MFD) value. Then, so as to attain the desired bending loss and strain response for the optical fiber, the optimization tool of the evolutionary genetic algorithm (GA) is employed to determine the optical and geometrical parameters of the structure. In the first designed fiber, the calculations for BL, MFD, effective area (Aeff), and effective refractive index (neff) sensitivity to strain in the well-known wavelength of 1.55 µm are 0.0018 dB per each turn of 5 mm curvature radius, 8.53 µm, 58 µm2, and 4.5 × 10-8 µɛ-1, respectively. Furthermore, the effect of placing raised outer cladding in the fiber structure is investigated which exhibits the MFD of 8.63 µm, 0.0093 dB BL for single turn of 5 mm radius, and 87 µm2 Aeff at 1.55 µm. In this case the strain sensitivity of 6.7 × 10-8 µɛ-1 is calculated for the neff. The mentioned effective area is magnificently large in the domain of bend insensitive fibers. In the meantime, the designed structures are insensitive to strain which is a crucial feature in applications with small curvature radius.

Influence of refractive index measurement accuracy on single-mode optical fiber modeling

1992 ◽  
Vol 4 (11) ◽  
pp. 1282-1284 ◽  
Author(s):  
E. Jaunart ◽  
P. Megret ◽  
J.C. Froidure ◽  
P. Crahay ◽  
M. Blondel ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Measurement Accuracy ◽  
Single Mode ◽  
Refractive Index Measurement ◽  
Single Mode Optical Fiber ◽  
Index Measurement
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