Title

Polarization selective hologram-based photonic delay lines

Authors

Authors

N. Madamopoulos;N. A. Riza

Comments

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Abbreviated Journal Title

Opt. Commun.

Keywords

phased array antennas; polarization-selective holograms; polymer; dispersed liquid crystal (PDLC); ferroelectric liquid crystal (FLC); photonic beamformer; delay lines; microwave radar; DISPERSED LIQUID-CRYSTAL; GRATINGS; DESIGN; DEVICE; LENS; UNIT; Optics

Abstract

The use of polarization selective holograms as optical signal routing elements for the implementation of photonic delay lines (PDLs) is proposed. A single bit PDL using ferroelectric liquid crystal (FLC) devices as active polarization switches and polymer dispersed liquid crystal (PDLC) devices as polarization selective holograms for optical path routing is experimentally demonstrated and characterized. Different within-channel leakage noise filters for improved PDL performance are discussed and experimentally demonstrated. Record high optical signal-to-leakage noise ratios ( > 45 dB) are obtained for both PDL settings using a combination of the proposed noise filters. An alternative reflective PDL architecture is also proposed. This reflective architecture requires half the physical length for each path compared with the transmissive design to obtain the same time delays. Other polarization dependent optical router designs based on birefringent-mode nematic liquid crystal (NLC) devices are also proposed. (C) 1998 Elsevier Science B.V. All rights reserved.

Journal Title

Optics Communications

Volume

157

Issue/Number

1-6

Publication Date

1-1-1998

Document Type

Article

Language

English

First Page

225

Last Page

237

WOS Identifier

WOS:000077541700041

ISSN

0030-4018

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