All-Optical NRZ-to-Inverted-RZ Converter with Extinction Ratio Enhancement Using a Modified Terahertz Optical Asymmetric Demultiplexer

Hyuek Jae LEE  Kwangjoon KIM  Jee Yon CHOI  Hae-Geun KIM  Chu Hwan YIM  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.2   pp.335-337
Publication Date: 1999/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Joint Special Issue on Photonics in Switching: Systems and Devices)
Category: Photonic Switching Devices
optical communication,  cross-gain compression,  terahertz optical asymmetric demultiplexer,  extinction ratio enhancement,  NRZ-to-RZ conversion,  

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To enhance the extinction ratio (ER) of NRZ-to-inverted-RZ converter based on cross-gain compression of a semiconductor optical amplifier (SOA), a modified terahertz optical asymmetric demultiplexer (TOAD) is cascaded. ER is improved from 1.6-6.7 dB to 5.4-14.5 dB, depending on the intensity of input optical NRZ signal. The proposed NRZ-to-inverted-RZ converter enhances and regulates ER to a high value (14.5 dB) for very wide optical NRZ signal intensity range.