Wavelength Dependence of Optical Waveguide-Type Devices for Recognition of QPSK Routing Labels

Yoshihiro MAKIMOTO  Hitoshi HIURA  Nobuo GOTO  Shin-ichiro YANAGIYA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.2   pp.157-163
Publication Date: 2010/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.157
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optoelectronics
Keyword: 
QPSK code,  self-routing,  label recognition,  wavelength dependence,  

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Summary: 
In photonic label routing networks, recognition of optical labels is one of the key functions. We have proposed passive waveguide-type devices for recognition of optical labels coded in quadri-phase-shift-keying (QPSK) form. In this paper, we consider wavelength dependence of the devices. The basic module of the proposed device consists of a 3-dB directional coupler, two Y-junctions, and an asymmetric X-junction. The Y-junction and an asymmetric X-junction have basically no wavelength dependence. Although the 3-dB directional coupler has weak wavelength dependence, the device for two-symbol label recognition is found to work in wavelength 1.5-1.6 µm. The performance of the device is confirmed by simulation using beam propagation method (BPM).