Abstract
A novel optical spatial quantized analog-to-digital converter (ADC)
is presented and the performance enhancements through employing this architecture
are analyzed theoretically. A high-speed low-jitter ADC sampling clock is
provided by a mode-locked laser. A high sampling rate is maintained by avoiding
any speed-limiting conversion from optical to electrical domain in an all-optical
quantization technique. A high quantization bandwidth is achieved by employing
the all-optical quantization technique, benefiting from the high bandwidth
characteristics of optical modulation. A high ADC resolution is obtained by
using a single-channel quantization configuration and detecting a single image
at each sampling step. A high power efficiency is achieved by extracting some
portions of the required power from the analog electrical signal and optical
sampling clock, directly. Various ADC-resolution limiting factors including
the ambiguity of photodetectors, jitter of the optical sampling-clock, the
limited beam deflector bandwidth, dispersion, phase modulator nonlinearity/mismatch,
noise, and crosstalk have been identified and the contribution of each effect
has been discussed.
© 2008 IEEE
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