Title

Polarization selective hologram-based photonic delay lines

Keywords

Delay lines; Ferroelectric liquid crystal (FLC); Microwave radar; Phased array antennas; Photonic beamformer; Polarization-selective holograms; Polymer dispersed liquid crystal (PDLC)

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. © 1998 Elsevier Science B.V. All rights reserved.

Publication Date

12-1-1998

Publication Title

Optics Communications

Volume

157

Issue

1-6

Number of Pages

225-237

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S0030-4018(98)00501-X

Socpus ID

0032304980 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0032304980

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