We propose and demonstrate, theoretically and experimentally, a novel achromatic optical phase shifter–modulator based on a frequency-domain optical delay line configured to maintain zero group delay as variable phase delay is generated by means of tilting a mirror. Compared with previously reported phase shifter–modulators, e.g., based on the Pancharatnam (geometric) phase, our device is high speed and polarization insensitive and produces a large, bounded phase delay that, uniquely, is one-to-one mapped to a measurable parameter, the tilt angle.
© 2001 Optical Society of America
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(350.1370) Other areas of optics : Berry's phase
Andrei V. Zvyagin and David D. Sampson, "Achromatic optical phase shifter–modulator," Opt. Lett. 26, 187-189 (2001)