Multiple quantum wells spatial light modulators for correlation based processors

Bertrand Noharet; Stephane Junique

doi:10.1117/12.449678

30 November 2001 Multiple quantum wells spatial light modulators for correlation based processors

Bertrand Noharet, Stephane Junique

Proceedings Volume 10302, Optoelectronic Information Processing: Optics for Information Systems: A Critical Review; 103020G (2001) https://doi.org/10.1117/12.449678
Event: Optoelectronic Information Processing: Optics for Information Systems, 2002, Valencia, Spain

Abstract

To be competitive with their electronic counterparts, correlation-based optical processors require very fast spatial light modulators (SLMs) that can perform simultaneously phase and amplitude modulation. Owing to their ultra-high speed, multiple quantum well (MQW) SLMs have been early identified as very good candidates. However, the coding domain of MQW SLMs is not widely known. We present here a study of available coding domains of MQW SLMs. We demonstrate that pure amplitude modulation, ternary { -1, 0, + 1} modulation and quaternary {0, + 1, e^i2π/3, e^i4π/3}, modulation are examples of coding domains that can be achieved by tuning a few parameters in the design of Fabry-Perot MQW modulators. We show that ternary and quaternary filters provide much better results than binary filters for the recognition of objects embedded in highly cluttered noise. Finally, we present a technique, the time-averaged pseudo-random encoding technique, which enables encoding of any complex filter onto a quaternary modulator. Combined with the time-averaged pseudo-random encoding technique, MQW SLMs may pave the way to the development of new optoelectronic correlator systems with improved speed and accuracy performance.

Citation Download Citation

Bertrand Noharet and Stephane Junique "Multiple quantum wells spatial light modulators for correlation based processors", Proc. SPIE 10302, Optoelectronic Information Processing: Optics for Information Systems: A Critical Review, 103020G (30 November 2001); https://doi.org/10.1117/12.449678

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