title: All-optical modulation format conversion from NRZ-OOK to RZ-QPSK using parallel SOA-MZI OOK/BPSK converters.
abstract: A novel all-optical modulation format conversion from non-return-to-zero on-off-keying (NRZ-OOK) to return-to-zero quadrature-phase-shift-keying (RZ-QPSK) is proposed and experimentally demonstrated. The proposed format conversion scheme is based on parallel Mach-Zehnder interferometric (MZI) OOK/binary-PSK (BPSK) converters, consisting of integrated semiconductor optical amplifiers (SOAs). We experimentally demonstrate that in both decoded channels of the converted RZ-QPSK signal bit error rate (BER) curves show almost the same receiver sensitivity at a symbol-rate of 10.7 Gsymbol/s. In addition, a reasonable dispersion tolerance of the converted signal up to +295 ps/nm is observed. The numerical simulation based upon carrier rate equation verifies the experimental results.
authors: Ken
authors: K
authors: Mishina
authors: Suresh M
authors: SM
authors: Nissanka
authors: Akihiro
authors: A
authors: Maruta
authors: Shunsuke
authors: S
authors: Mitani
authors: Kazuyuki
authors: K
authors: Ishida
authors: Katsuhiro
authors: K
authors: Shimizu
authors: Tatsuo
authors: T
authors: Hatta
authors: Ken-Ichi
authors: K
authors: Kitayama