Lasers, Fiber Optics, and Communications

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

[+] Author Affiliations
Shaojie Zhang, Shilin Xiao, Yunhao Zhang, Hanlin Feng, Lu Zhang

Shanghai Jiao Tong University, State Key Laboratory of Advanced Optical Communication System and Networks, Department of Electronic Engineering, 800 Dongchuan Road, Shanghai 200240, China

Zhao Zhou

State Grid Information and Communication Company of Hunan Electric Power Corporation, 388 Shaoshan North Road, Changsha 410000, China

Opt. Eng. 55(2), 026116 (Feb 18, 2016). doi:10.1117/1.OE.55.2.026116
History: Received December 3, 2015; Accepted January 22, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Shaojie Zhang ; Shilin Xiao ; Yunhao Zhang ; Hanlin Feng ; Lu Zhang, et al.
"Directly modulated laser-based optical radio frequency self-interference cancellation system", Opt. Eng. 55(2), 026116 (Feb 18, 2016). ; http://dx.doi.org/10.1117/1.OE.55.2.026116


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