Can 100-Gb/s QPSK Signal Locate Adjacent to Legacy 10-Gb/s OOK Signal without Guard-Band?

摘要

For 100-Gb/s quadriphase-shift keying (QPSK) signal with on-off keying (OOK)signal in neighboring wavelength-division-multiplexed (WDM) channel, thesmoothing filter in the feedforward phase estimation scheme must be optimizedto minimize the phase error. With optimal Wiener filter, typical 0-dBm launchedpower 10-Gb/s OOK signals give a SNR penalty of 0.66 and 0.30 dB for standardsingle-mode and nonzero dispersion-shifted fibers, respectively.