Resonant grating-waveguide structures formed with InP/InGaAsP semicond
uctor materials were tested to show light modulation at a wavelength o
f 1.55 mu m. Narrow, subnanometer resonant spectral bandwidths and a r
atio of reflected intensities between resonance and away from resonanc
e of greater than 50 were measured. For a resonant structure with an a
rea of 3 mm x 3 mm, the modulation frequency reached 5 MHz. (C) 1996 O
ptical Society of America