Spectrum efficiency improvement of directly detected OFDM based on balance receiver

Chao Tang; Hongwei Chen; Minghua Chen; Shizhong Xie

doi:10.1117/12.852047

1 December 2009 Spectrum efficiency improvement of directly detected OFDM based on balance receiver

Chao Tang, Hongwei Chen, Minghua Chen, Shizhong Xie

Proceedings Volume 7632, Optical Transmission Systems, Switching, and Subsystems VII; 76320Z (2009) https://doi.org/10.1117/12.852047
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

A novel optical single-sideband directly detected orthogonal frequency division multiplexing (DD-OFDM) system based on balance receiver consisting of two PINs is proposed and demonstrated. By introducing phase shift of π to one arm of the proposed receiver, inter-modulation distortion (IMD) near the optical carrier can be eliminated efficiently. The simulation results show that our system improves spectral efficiency to about 1.54 bps/Hz with 4-quadrature amplitude modulation (4QAM) mapping, and the optical carrier and signal power ratio (CSPR) has negligible impact on the OSNR performance, which can be improved by 3 dB with negligible error vector magnitude (EVM) penalty. Additionally, the optimum CSPR can be controlled by adjusting them respectively. 5 Gbit/s data with 4QAM mapping and 6.25% cyclic prefix (CP) inserted is successfully transmitted over 320 km of standard single mode fiber (SSMF) and our system exhibits a negligible penalty. Higher spectral efficiency can be achieved with more complex modulation formats and polarization multiplexing.

Citation Download Citation

Chao Tang, Hongwei Chen, Minghua Chen, and Shizhong Xie "Spectrum efficiency improvement of directly detected OFDM based on balance receiver", Proc. SPIE 7632, Optical Transmission Systems, Switching, and Subsystems VII, 76320Z (1 December 2009); https://doi.org/10.1117/12.852047

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