Simultaneous Generation of Multi-Channel Broadband Chaotic Signals Based on Two Unidirectionally Coupled WRC-FPLDs

Chun-Xia Hu,Gong-Ru Lin,Guang-Qiong Xia,Zheng-Mao Wu,Dian-Zuo Yue,Wen-Yan Yang,Zai-Fu Jiang

doi:10.1109/jphot.2020.3027598

Chun-Xia Hu, Gong-Ru Lin + Show 5 more

Open Access

https://doi.org/10.1109/jphot.2020.3027598

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Abstract

We propose and demonstrate experimentally a scheme for simultaneously generating multi-channel broadband chaotic signals based on two unidirectionally coupled weak-resonant-cavity Fabry-Perot laser diodes (WRC-FPLDs) with almost the same mode interval, where one WRC-FPLD is utilized as master WRC-FPLD (M-WRC-FPLD) and the other is used as slave WRC-FPLD (S-WRC-FPLD). Under the optical injection from the M-WRC-FPLD with suitable injection parameters, multiple longitudinal modes of the S-WRC-FPLD can be simultaneously driven into chaotic states, which can provide multi-channel chaotic signals. Via a tunable optical filter, we inspect the performances of 9-channel chaotic signals, the results show that the chaotic bandwidths are within the range of 8∼15 GHz for all the 9-channel chaotic signals. Furthermore, the influences of the injection power and frequency detuning on the performances of the chaotic output from one of the channels are also analyzed.

Highlights

Optical chaos has been paid much attention due to its potential applications in various fields including physical random bit generation [1]–[3], optical time domain reflectometers (OTDR) [4], ranging lidars [5]–[7], and chaos-based optical communications [8]–[14]
We propose and demonstrate experimentally a scheme for simultaneously generating multi-channel broadband chaotic signals based on two unidirectionally coupled weak-resonant-cavity Fabry-Perot laser diodes (WRC-FPLDs) with almost the same mode interval, where one WRC-FPLD is utilized as master WRC-FPLD (M-WRC-FPLD) and the other is used as slave WRC-FPLD (S-WRC-FPLD)
The 10% part is sent to an optical power meter (PM, Thorlabs PM100D) for monitoring the optical power injected into the S-WRC-FPLD, and the other 90% part is injected into the S-WRC-FPLD through port 1 of an optical circulator (OC)

Summary

Introduction

Optical chaos has been paid much attention due to its potential applications in various fields including physical random bit generation [1]–[3], optical time domain reflectometers (OTDR) [4], ranging lidars [5]–[7], and chaos-based optical communications [8]–[14]. Based on two single-mode SLs, Paul et al proposed a scheme for generating dual-channel chaotic signals, which are utilized as two chaotic carriers for achieving dual-channel chaotic optical communication [24]. Based on two mutually coupled DFB-SLs, Tang et al demonstrated the generation of dualchannel chaotic signals, which are taken as the chaotic entropy source to generate high-speed physical random bits [25]. Based on two mutually coupled VCSELs, our group demonstrated that four-channel chaotic signals can be generated. Taking the four-channel chaotic signals as chaotic entropy sources, four-channel physical random bit sequences are obtained [27].

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Conclusion