Direct-detection optical differential 8-level phase-shift keying (OD8PSK) for spectrally efficient transmission

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Optics Express, ISSN: 1094-4087, Vol: 12, Issue: 15, Page: 3415-3421

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Cheolhwan Kim; Guifang Li
The Optical Society
Physics and Astronomy; DQPSK SIGNALS; Optics
article description
An implementation of optical differential 8-level phase-shift keying (OD8PSK) is proposed for spectrally efficient high capacity long-haul optical fiber transmission systems. Interferometric demodulation and direct detection at the receiver yield three output binary sequences identical to the three input binary sequences. This is accomplished by proper design of electrical encoding and optical encoding at the transmitter. Three optical encoding schemes are proposed with corresponding differential electrical encoding schemes. Numerical simulations are performed for a single channel transmission to evaluate the transmission performances of OD8PSK systems. © 2004 Optical Society of America.