title: Free spectral range optimization of return-to-zero differential phase shift keyed demodulation in the presence of chromatic dispersion.
abstract: Optical differential phase shift keying is normally demodulated in a delay-line interferometer with a 1-bit delay such that the free-spectral-range of the demodulator is equal to the transmitted bitrate. We show using Karkunen-Loeve expansion simulation that free-spectral-range optimization leads to increased chromatic dispersion tolerances. The optimized delay inversely scales with the amount of chromatic dispersion such that a delay slightly shorter than the bit period increases tolerances with no adverse effect on the polarization-mode-dispersion tolerance or frequency offset penalty at the receiver.
authors: Yannick K
authors: YK
authors: Lizé
authors: Louis
authors: L
authors: Christen
authors: Xiaoxia
authors: X
authors: Wu
authors: Jeng-Yuan
authors: JY
authors: Yang
authors: Scott
authors: S
authors: Nuccio
authors: Teng
authors: T
authors: Wu
authors: Alan E
authors: AE
authors: Willner
authors: Raman
authors: R
authors: Kashyap