High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality

Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


We propose a simple and high-performance scheme for demultiplexing coherent Nyquist TDM signals by photo-mixing on a photo-detector with Nyquist LO pulses. This scheme takes advantage of the timedomain orthogonality of Nyquist pulses, which enables high-SNR demultiplexing and homodyne detection simultaneously in spite of a strong overlap with adjacent pulses in the time domain. The feasibility of this scheme is demonstrated through a demultiplexing experiment employing 80 Gbaud, 64 QAM Nyquist pulse OTDM signals. This scheme exhibits excellent demultiplexing performance with a much simpler configuration than a conventional ultrafast all-optical sampling scheme.

Original languageEnglish
Pages (from-to)29456-29464
Number of pages9
JournalOptics Express
Issue number24
Publication statusPublished - 2014 Dec 1


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