Directly modulated laser-based optical radio frequency self-interference cancellation system

Shaojie Zhang; Shilin Xiao; Yunhao Zhang; Hanlin Feng; Lu Zhang; Zhao Zhou

doi:10.1117/1.OE.55.2.026116

18 February 2016 Directly modulated laser-based optical radio frequency self-interference cancellation system

Shaojie Zhang, Shilin Xiao, Yunhao Zhang, Hanlin Feng, Lu Zhang, Zhao Zhou

Author Affiliations +

Optical Engineering, Vol. 55, Issue 2, 026116 (February 2016). https://doi.org/10.1117/1.OE.55.2.026116

Abstract

We propose a microwave photonics system for radio frequency self-interference cancellation using optical techniques. With a simple structure, this system employs two low-cost directly modulated lasers and a balanced photodetector to subtract the strong self-interference signal from a corrupted received signal. For commonly used wireless applications, 40-dB cancellation within 900-MHz band and 33-dB cancellation within 2.4-GHz band are experimentally obtained, both over 400-MHz bandwidth. Moreover, for ultra-wideband cancellation, this system achieves more than 27-dB cancellation over 6-GHz bandwidth. The experimental results show good recovery of the weak signal of interest buried by strong self-interference after the cancellation.

Citation Download Citation

Shaojie Zhang, Shilin Xiao, Yunhao Zhang, Hanlin Feng, Lu Zhang, and Zhao Zhou "Directly modulated laser-based optical radio frequency self-interference cancellation system," Optical Engineering 55(2), 026116 (18 February 2016). https://doi.org/10.1117/1.OE.55.2.026116

Published: 18 February 2016

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