Abstract

A Bragg grating was fabricated in a D-shaped fiber that was subsequently coated with an αSi:H semiconductor film. The reflected spectrum was optically controlled by means of evanescent coupling, shifting to shorter wavelengths with increased control-light power. The effective nonlinearity of the fiber was 2.0×10-10 cm2/W. The device was optically tuned by 4.3×10-4 nm/mW, leading to 54% >3dB depth modulation for 230  mW of power.

© 1999 Optical Society of America

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