Polarization selective hologram-based photonic delay lines

    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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