A Polarization-Independent Local Node Construction for Optical WDM Ring Networks Using a Centralized Multiwavelength Light Source

Shinji YAMASHITA  Kazuo HOTATE  Masataka ITO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E81-B   No.11   pp.2168-2175
Publication Date: 1998/11/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication
Keyword: 
WDM,  ring network,  local node,  add/drop multiplexing filter,  polarization-independent modulator,  

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Summary: 
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.