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Updated: May 29, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Channel estimation and synchronization for polarization-division multiplexed CO-OFDM using subcarrier/polarization
Chun Ju Youn1, Xiang Liu, S Chandrasekhar
1Photonic/Wireless Convergence Component Department, Electronics and Telecommunications Research Institute 138 Gajeongno, Yuseong-gu, Daejeon, 305-700, Korea. cjyoun@etri.re.kr
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.
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