Direct-Detection PDM-OFDM RoF System for 60-GHz 2×2 MIMO Wireless Transmission Without Polarization Tracking

• Published in: Journal of lightwave technology Vol. 36; no. 17; pp. 3739 - 3745
• Main Authors: Huang, Hou-Tzu, Sun, Chung-Shin, Lin, Chun-Ting, Wei, Chia-Chien, Zeng, Wei-Siang, Chang, Hsi-Yu, Shih, Boris, Ng'oma, Anthony
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Demodulation; Millimeter wave communication; MIMO communication; multi-input-multi-output (MIMO); OFDM; OFDM modulation; optical fiber communication; Optical fibers; Optical polarization; Orthogonal Frequency Division Multiplexing; polarization division multiplexing; Subcarriers; Tracking; Training; Wireless communication; Wireless sensor networks
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2018.2840102

This work experimentally demonstrates a 60-GHz direct-detection polarization division multiplexing and orthogonal frequency division multiplexing (PDM-OFDM) system that does not require polarization tracking. The frequency offset of un-modulated optical carriers and a novel training symbol design enable the estimation of optical polarization mixing and wireless multi-input-multi-output (MIMO) channels for signal demodulation. We also adopted an empty subcarrier to mediate noise enhancement. Simulation and experiment results both demonstrate the feasibility of this approach. With pre-compensation, we achieved a BER of 1 × 10 -3 under all polarization states over 10-km fiber and 3-m wireless MIMO transmission. The maximal allowable transmission data rate of up to 52 Gb at the worst case of states of polarization can be achieved.