EA Modulator-Based Optical Multiplexing/Demultiplexing Techniques for 160 Gbit/s OTDM Signal Transmission

Hitoshi MURAI
Masatoshi KAGAWA
Hiromi TSUJI
Kozo FUJII

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.3    pp.309-318
Publication Date: 2005/03/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.3.309
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Section on Optical Signal-Processing Devices for Photonic Networks)
Category: 
Keyword: 
EA modulator,  OTDM,  CS-RZ,  160 Gbit/s,  modulation format,  

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Summary: 
160 Gbit/s optical-time-division-multiplexing (OTDM) transmitter/receiver employing electroabsorption (EA) modulators are described. In the 160 Gbit/s OTDM transmitter, the optical multiplexer, which implemented four EA modulators, is used and the generation of authentic 160 Gbit/s OTDM signal is realized. The optical multiplexer also enables to generate the phase-coded OTDM signal such as carrier-suppressed return-to-zero (CS-RZ) signal at 160 Gbit/s by changing driving temperatures of the EA modulators. In the 160 Gbit/s receiver, the EA modulator is also used in an optical demultiplexer and a phase-locked-loop (PLL) for clock extraction. As both optical demultiplexer and PLL are insensitive to polarization state of incoming signal, highly stable operation is achieved. We also show some results of transmission experiment using the developed OTDM transmitter/receiver and discuss the advantage of a switching capability of modulation format in the 160 Gbit/s signal transmission.