Regular Article

Nanosecond pulse signals restoration via stochastic resonance in the Fabry-Perot cavity with graphene

¹ State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, P.R. China
² Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi, P.R. China
³ University of Chinese Academy of Sciences, Beijing 100049, P.R. China

^a e-mail: liuhongjun@opt.ac.cn

Received: 23 April 2017
Revised: 25 June 2017
Accepted: 29 June 2017
Published online: 21 July 2017

Abstract

We investigate a technology for reconstructing nanosecond pulse noise hidden signals via stochastic resonance, which is based on optical bistability in the Fabry-Perot (F-P) cavity with graphene. The bistable properties are analyzed with different initial wavelengths and Fermi energies. The system is tunable and the bistable behavior of the output intensity can be accurately controlled to obtain a cross-correlation gain larger than 10 in a wide range of input signal-to-noise (SNR) ratio from 1:8 to 1:45. Meanwhile, the distortion of the output signal and the pulse tailing caused by the phase delay can be reduced to a negligible level. This work provides a potential method for detecting low-level or hidden pulse signals in various communication fields.