• Title : NRZ-OOK-to-RZ-BPSK modulation-format conversion using SOA-MZI wavelength converter
• Author : Ken Mishina, Akihiro Maruta, Shunsuke Mitani, Toshiharu Miyahara, Kazuyuki Ishida, Katsuhiro Shimizu, Tatsuo Hatta, Kuniaki Motoshima, and Ken-ichi Kitayama
• Journal : IEEE J. Lightwave Technol., vol. 24, no. 10, October 2006.
• Abstract : A novel all-optical modulation-format conversion from nonreturn-to-zero on-off keying (NRZ-OOK) to return-to-zero binary phase-shift keying (MZI) wavelength converter consisting of integrated semiconductor optical amplifiers (SOAs) is utilized to implement the proposed format conversion. Error-free operation at a bit rate of 10.7 Gb/s is experimentally demonstrated in order to show the feasibility of the proposed scheme. The received sensibility of the converted signal is improved by 2.9 dB compared with a back-to-back NRZ-OOK signal at BER=10-9. In addition, a reasonable dispersion tolerence of the converted signal up to +-500 ps/nm is observed. The numerical simulation based upon the carrier-rate equation verifies the experimental results.

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