Recognition of 16 QAM Codes by Maximum Output with Optical Waveguide Circuits, Thresholders, and Post-Processing Logic Circuit

Kensuke INOSHITA  Nobuo GOTO  Shin-ichiro YANAGIYA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.5   pp.448-454
Publication Date: 2014/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.448
Type of Manuscript: PAPER
Category: Optoelectronics
Keyword: 
optical QAM code,  code recognition,  optical waveguide circuits,  optical QPSK code,  

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Summary: 
Optical processing of optical labels is expected for increasing processing speed in network routers. We previously proposed optical waveguide circuits for recognition of optical QAM codes by detecting a null output port. The circuits are based on a recognition circuit for QPSK codes. In the device, however, optical or electrical inverters with large dynamic range are required. In this paper, we propose optical circuits to recognize optical QAM codes by maximum output with a post-processor consisting of thresholders and logical circuits. The recognition function of the waveguide circuit is numerically proved by FD BPM.