Measurement of refractive-index profile of single-mode optical fibers by the propagation-mode near-field method

1985 ◽  
Vol 3 (2) ◽  
pp. 244-247 ◽  
Author(s):  
K. Morishita
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Near Field ◽  
Single Mode ◽  
Refractive Index Profile ◽  
Field Method ◽  
Propagation Mode ◽  
Index Profile

Measurements. Accuracy Improvement of the Refracted Near-Field Method by Laser Cavity Stabilization

1984 ◽  
Vol 5 (4) ◽  
Author(s):  
B. Hillerich
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Near Field ◽  
Laser Cavity ◽  
Refractive Index Profile ◽  
Field Method ◽  
Laser Resonator ◽  
Index Profile ◽  
Accuracy Improvement ◽  
Active Stabilization

SummaryFor accurate refractive-index profile measurements of optical fibers with the refracted near-field method the output signal of the instrument has to be extremely stable. It has been found that some instability is caused by beam shifts due to “mode sweeping” in the laser resonator. By active stabilization of the laser cavity the residual fluctuations are reduced to 10

Coupling conditions for quasi-single mode optical fibers with different refractive index profile

2013 ◽  
Author(s):  
Petr Siska ◽  
Jan Latal ◽  
Petr Koudelka ◽  
Jan Vitasek ◽  
Ivan Kasik ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Single Mode ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Coupling Conditions

scholarly journals Researches of Parameters of Chiral Few-Mode Optical Fiber Pilot Sample with Improved Height of Step Refractive Index Profile

2021 ◽  
Vol 7 (1) ◽  
pp. 6-19
Author(s):  
A. Bourdine ◽  
A. Barashkin ◽  
V. Burdin ◽  
M. Dashkov ◽  
V. Demidov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Near Field ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Technological Parameters ◽  
Dispersion Parameters ◽  
Core Diameter ◽  
Pilot Sample

This work presents results of researhes of fabricated pilot sample of chiral few-mode optical fiber (FMF) with induced twisting of 10 and 66 revolutions per meter, core diameter 11 µm (that almost corresponds to standard singlemode optical fibers), typical “telecommuniction” cladding diameter 125 µm and improved height of step refractive index profile. Proposed few-mode optical fiber supports 4 guided modes over “C”-band. We considered design and selection of desired technological parameters, based on results of computations, performed by both rigorous and approximation methods. Spectral curves of dispersion parameters are reprented as well as results of experimental measurements near-field laser beam profile and spectral and pulse responces of laser-excited optical signals.

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