Abstract
High quality optical phase modulators are a key element in the development of photonic integrated circuits (PICs) for coherent optical modulation use.1 Applications such as control of large phased-arrays of optical or microwave emitters require highly linear control of individual emitter phase and would benefit from simple direct-digital control of far-field radiation patterns. Until now, optical phase modulators have been strictly analog, requiring a continuously varied bias to achieve phase control,2 and have had a nonlinear bias-to-phase delay relationship. These two limitations have hampered use of optical phase modulators in PICs. We describe what we believe to be the first ever design and fabrication of a fully digital, inherently linear, optical waveguide phase modulator and discuss its use in a PIC for phased- array radar control.
© 1992 Optical Society of America
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