title: Channel estimation and synchronization for polarization-division multiplexed CO-OFDM using subcarrier/polarization interleaved training symbols.
abstract: We propose and demonstrate the use of subcarrier/polarization-interleaved training symbols for channel estimation and synchronization in polarization-division multiplexed (PDM) coherent optical orthogonal frequency-division multiplexed (CO-OFDM) transmission. The principle, the computational efficiency, and the frequency-offset tolerance of the proposed method are described. We show that the use of subcarrier/polarization interleaving doubles the tolerance to the frequency offset between the transmit laser and the receiver's optical local oscillator as compared to conventional schemes. Using this method, we demonstrate 43-Gb/s PDM CO-OFDM transmission with 16-QAM subcarrier modulation over 5,200-km of ultra-large-area fiber.
authors.affiliation: Photonic/Wireless Convergence Component Department, Electronics and Telecommunications Research Institute 138 Gajeongno, Yuseong-gu, Daejeon, 305-700, Korea. cjyoun@etri.re.kr
authors.forename: Chun Ju
authors.initials: CJ
authors.lastname: Youn
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Chandrasekhar
authors.forename: Yong-Hwan
authors.initials: YH
authors.lastname: Kwon
authors.forename: Jong-Hoi
authors.initials: JH
authors.lastname: Kim
authors.forename: Joong-Seon
authors.initials: JS
authors.lastname: Choe
authors.forename: Duk-Jun
authors.initials: DJ
authors.lastname: Kim
authors.forename: Kwang-Seong
authors.initials: KS
authors.lastname: Choi
authors.forename: Eun Soo
authors.initials: ES
authors.lastname: Nam