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Indexed by:期刊论文

Date of Publication:2013-03-01

Journal:OPTIK

Included Journals:SCIE、EI

Volume:124

Issue:5

Page Number:377-384

ISSN No.:0030-4026

Key Words:Microwave photonics; Optical beamforming network; True time delay line; Waveguide ring resonator

Abstract:The influence of coupling conditions of parallel-cascaded waveguide ring resonators on the time delay application in the optically phased array antennas is analyzed. Two kinds of coupling conditions, over-coupling and restriction free are considered to achieve a certain target delay time by parallel-cascaded three ring resonators. The results show that the restriction free coupling condition is better than the over-coupling one to obtain a flat time delay response in the target delay bandwidth especially for the small target delay time, which is the advantage of ring-resonator-based tunable true time delay line. The influence of round-trip loss on the time delay response and the transmission amplitude response is also investigated, which indicates that ring resonators with low optical round-trip loss are preferred to achieve a high performance true time delay line. (C) 2012 Elsevier GmbH. All rights reserved.