Applications of FFT and digital filtering in reconstruction of refractive index profile of surface channel waveguides from near-field intensity pattern

1999 ◽  
Author(s):  
Hery Susanto Djie ◽  
Henri P. Uranus ◽  
M Muljono ◽  
John E. Batubara
Keyword(s):  
Refractive Index ◽  
Field Intensity ◽  
Near Field ◽  
Digital Filtering ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Intensity Pattern ◽  
Channel Waveguides

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

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