title: Baud-rate flexible clock recovery and channel identification in OTDM realized by pulse position modulation.
abstract: 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.
authors.affiliation: Network Photonics Research Center, National institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan. t.kurosu@aist.go.jp
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kurosu
authors.forename: Ken
authors.initials: K
authors.lastname: Tanizawa
authors.forename: Dexiang
authors.initials: D
authors.lastname: Wang
authors.forename: Sze Yun
authors.initials: SY
authors.lastname: Set
authors.forename: Shu
authors.initials: S
authors.lastname: Namiki
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D055096:Optical Devices; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*