Full-complex amplitude modulation with binary spatial light modulators

Date
2011-10-19
Advisor
Instructor
Source Title
Optical Society of America. Journal A: Optics, Image Science, and Vision
Print ISSN
1084-7529
Electronic ISSN
Publisher
Optical Society of America
Volume
28
Issue
11
Pages
2310 - 2321
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Imperfections and nonrobust behavior of practical multilevel spatial light modulators (SLMs) degrade the performance of many proposed full-complex amplitude modulation schemes. We consider the use of more robust binary SLMs for this purpose. We propose a generic method, by which, out of K binary (or 1 bit) SLMs of size M × N, we effectively create a new 2K -level (or K bit) SLM of size M × N. The method is a generalization of the well-known concepts of bit plane representation and decomposition for ordinary gray scale digital images and relies on forming a properly weighted superposition of binary SLMs. When K is sufficiently large, the effective SLM can be regarded as a full-complex one. Our method is as efficient as possible from an information theoretical perspective. A 4f system is discussed as a possible optical implementation. This 4f system also provides a means for eliminating the undesirable higher diffraction orders. The components of the 4f system can easily be customized for different production technologies.

Course
Other identifiers
Book Title
Keywords
Amplitude modulation, Information theory, Light modulation, Scales (weighing Instruments)
Citation
Published Version (Please cite this version)