Abstract

An entirely new class of electrooptic analog-to- digital converters (ADCs) and modulators for optical computing and optical signal processing uses is presented. This new device, based on wavelength division multiplexing and utilizing an integrated high speed tunable single-mode channel waveguide Fabry-Perot etalon, can function as a binary or a multivalued ADC or wavelength modulator. The new wavelength modulation is parallel to existing modulation concepts including phase, intensity, polarization or mode conversion modulation, and frequency to space domain modulation(such as in acoustooptic spectrum analyzers.) The advantages of this A/D conversion/modulation concept include external A/D conversion/modulation and multivalued logical capability with self identification, eliminating the need for a sampling optical pulse and electronic comparators needed by other ADCs. Long distance digital optical signal transmission capability, electronically reconfigurable logical weights through initial bias, and high speed operation are also unique features. Additional advantages include its simple structure, high SNR, low BER, high dynamic range, excellent power budge, and thermal stability. The new wavelength modulation concept makes multiwavelength coding possible for use in highly secure optical communication for military and commercial purposes.

© 1991 Optical Society of America