A tunable cyclic encoder using photopolymer-based holographic grating for optical CDMA application

Seunghwan Chung; Taesu Kim; Seunghoon Han; Byoungho Lee

doi:10.1117/12.570298

7 February 2005 A tunable cyclic encoder using photopolymer-based holographic grating for optical CDMA application

Seunghwan Chung, Taesu Kim, Seunghoon Han, Byoungho Lee

Proceedings Volume 5636, Holography, Diffractive Optics, and Applications II; (2005) https://doi.org/10.1117/12.570298
Event: Photonics Asia, 2004, Beijing, China

Abstract

It is important to have a tunable encoder in optical channel coding for the purpose of coping with varying communication environment. In this paper, a tunable encoder based on the holographic grating (HG) using photopolymer as the holographic medium is described. The system is composed of photopolymer holographic grating as a demultiplexer, spatial light modulator (SLM), and other lens systems. The photopolymer grating acts as a demultiplexer to distribute optical wavelength channels on the SLM through its spatial dispersion property. Then, the SLM produces wavelength-endcoded data but its spatial amplitude/phase modulation. The merits of using the holographic grating are that it has relatively easy fabrication process, and that non-uniform grating structure and multiplexing can be exploited. In this setup, we can additionally change demultiplexing wavelengths by inducing strain gradient on the polymer grating, which is attached on the two XYZ linear stages. Hence a different set of wavelengths is incident to SLM and this enables another type of encoding pattern.

Citation Download Citation

Seunghwan Chung, Taesu Kim, Seunghoon Han, and Byoungho Lee "A tunable cyclic encoder using photopolymer-based holographic grating for optical CDMA application", Proc. SPIE 5636, Holography, Diffractive Optics, and Applications II, (7 February 2005); https://doi.org/10.1117/12.570298

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