title: Novel RZ-CW conversion scheme for ultra multi-level, high-speed coherent OTDM transmission.
abstract: A novel coherent multi-level OTDM transmission scheme is presented by using an RZ-CW conversion technique in a coherent receiver, in which the transmitted coherent RZ pulses are OTDM demultiplexed and converted into a CW signals for demodulation with a CW-LO. This scheme enables us to achieve a high SNR demodulation and demultiplexing performance even for ultrahigh-speed OTDM signals with ultra multi-level modulation, which would be difficult to realize with a conventional scheme of simultaneous demodulation and demultiplexing using a pulsed-LO. The advantage of this scheme is successfully demonstrated with 10 Gsymbol/s, 4- and 8-OTDM, 32-RZ/QAM demodulation experiments.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai-shi, 980-8577, Japan. nakazawa@riec.tohoku.ac.jp
authors.forename: Masataka
authors.initials: M
authors.lastname: Nakazawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kasai
authors.forename: Masato
authors.initials: M
authors.lastname: Yoshida
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Hirooka