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Spatial Quantized Analog-to-Digital Conversion Based on Optical Beam-Steering

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3 Author(s)
Jarrahi, M. ; Dept. of Electr. Eng., Stanford Univ., Stanford, CA ; Pease, R.F.W. ; Lee, T.H.

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 photodetector's, 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.

Published in:

Lightwave Technology, Journal of  (Volume:26 ,  Issue: 14 )

Date of Publication:

July15, 2008

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