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A Polarization-Independent Local Node Construction for Optical WDM Ring Networks Using a Centralized Multiwavelength Light Source
Shinji YAMASHITA Kazuo HOTATE Masataka ITO
IEICE TRANSACTIONS on Communications
Publication Date: 1998/11/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
WDM, ring network, local node, add/drop multiplexing filter, polarization-independent modulator,
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We propose and demonstrate a simple polarization-independent construction of a local node for optical WDM ring networks using a centralized multiwavelength light source (MWLS). The node is simply composed of a 4-port optical circulator, an add/drop multiplexing (ADM) filter, a reflective modulator, and a drop fiber Bragg grating (FBG). A Faraday rotator mirror (FRM) is used to enable an LiNbO3 intensity modulator to operate in the polarization-independent mode. We examine three ADM filters, an interference filter, a fiber Fabry-Perot (FP) filter, and a set of FBG's. An optical WDM system experiment is performed to demonstrate the feasibility of the proposed node construction.