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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
Publication Date: 1999/02/25
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.