Open AccessChannel estimation and synchronization for polarization-division multiplexed CO-OFDM using subcarrier/polarization interleaved training symbols
Author(s) -
Chun Ju Youn,
Xiang Liu,
S. Chandrasekhar,
Yong-Hwan Kwon,
Jong-Hoi Kim,
Joong-Seon Choe,
Duk-Jun Kim,
KwangSeong Choi,
Eun Soo Nam
Publication year - 2011
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.19.016174
Subject(s) - subcarrier , orthogonal frequency division multiplexing , polarization division multiplexing , optics , computer science , multiplexing , interleaving , electronic engineering , orthogonal polarization spectral imaging , bit error rate , physics , channel (broadcasting) , telecommunications , wavelength division multiplexing , laser , engineering , wavelength
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.