ANALYSIS OF OPTICAL CDMA SYSTEM BASED ON OPTICAL HOLOGRAPHY

Abstract

In this thesis, a technique for all-optical Code Division Multiple Access system based on Optical holography is studied. This technique utilizes full advantage of optical parallelism and complex spatial filtering to realize encoding and decoding in the context of an optical CDMA. This technique allows multiple transmitters to simultaneously use same non-coherent receiving aperture. In this technique, the energy of incoming information light signal is spread over a larger spatial domain by a two dimensional spatial encoder which consists of patterns of (0,1) or (1, -1). Subsequent decoding is obtained by a holographic filter, which spatially de-spreads the energy of information light signal and brings it to a bright focused light spot. In this thesis, the structure of encoder and decoder is described. Based on spatial harmonic de-composition, basic mathematical analysis for spread space holographic codes are analyzed. The analysis consists of Fourier Transform Lens and a holograp...