Title

Demonstration Of An All-Digital 7-Bit 33-Channel Photonic Delay Line For Phased-Array Radars

Abstract

A 7-bit multichannel photonic delay line for phased-array antenna control is demonstrated. Multichannel (33-pixel) ferroelectric liquid-crystal (FLC) devices are used as polarization rotation elements, and polarization beam-splitter cubes are used as polarization elements that route the optical signals to different paths. The controller is remotely fed by a unique fiber-optic-array design that uses gradientindex lens collimators for the input single-mode polarization-maintaining fibers. The optical signal is collected by a similar fiber array that uses multimode fibers for improved coupling efficiency. Photonic delay-line (PDL) design issues such as multiport assemblies, multipixel FLC designs, and delay-line architectures are discussed. Furthermore, various PDL parameters are examined. High electrical isolation numbers are obtained for both the within-channel leakage noise (e.g., less than −70 dB) and the interchannel cross talk (e.g., less than −90 dB). Optical and electrical insertion loss is examined for the PDL as well as for the overall system. A high-compression dynamic range of 149 dB z Hz and a spurious free dynamic range of 105 dB z Hz2y3 are presented. © 2000 Optical Society of America.

Publication Date

8-10-2000

Publication Title

Applied Optics

Volume

39

Issue

23

Number of Pages

4168-4181

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.39.004168

Socpus ID

0042761000 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0042761000

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