Open AccessBaud-rate flexible clock recovery and channel identification in OTDM realized by pulse position modulation
Author(s) -
Takayuki Kurosu,
Ken Tanizawa,
Dexiang Wang,
Sze Yun Set,
Shu Namiki
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.004447
Subject(s) - baud , clock recovery , jitter , optics , pulse position modulation , clock signal , modulation (music) , physics , signal (programming language) , channel (broadcasting) , computer science , pulse (music) , pulse amplitude modulation , telecommunications , transmission (telecommunications) , detector , acoustics , programming language
We propose a novel scheme of OTDM utilizing pulse position modulation, where optical null headers (ONH) are inserted between the signal pulses periodically to allow channel identification. The ONH also achieves in-band clock distribution through the generation of high contrast pilot tone on the signal power spectra, enabling baud-rate flexible clock recovery. Using the novel scheme, clock recovery with a timing jitter of less than 200 fs is achieved at different baud rates up to 344 Gbaud. We demonstrate stable clock recovery with channel identification in 344-Gb/s OTDM transmissions over dispersion managed 3-km SMF.