MU Penghua; WANG Yiqiao; HE Pengfei; XU Yuan

doi:10.7498/aps.74.20241659

Abstract

Nanolaser (NL), as an important optical source device, has a significant influence on photonic integrated circuits and has become a research hotspot in recent years. In this work, the synchronization performance of a dual-channel laser chaotic multiplexing system is investigated based on NLs and an active-passive decomposition is used to enhance signal processing and multiplexing efficiency. By establishing a rate equation model, the synchronization characteristics of the system are analyzed, with a focus on two key parameters— Purcell factor (F ) and spontaneous emission coupling factor (β )—as well as the effects of system parameters, single-parameter mismatch, and multi-parameter mismatch. Numerical simulations show that with appropriate parameter configurations, the two master NLs can maintain low correlation, ensuring the "pseudo-orthogonality" of chaotic signals while achieving high-quality chaotic synchronization with their paired slave NLs. In this work it is found that both the Purcell factor (F ) and the spontaneous emission coupling factor (β ) significantly affect the synchronization performance of the system, and the optimal parameter ranges for achieving high-quality synchronization are identified. Additionally, the effects of feedback strength and frequency detuning are explored, revealing that frequency detuning plays a more critical role in the synchronization between the master NLs. The influence of parameter mismatches on system synchronization performance is also emphasized. The system exhibits robustness against single-parameter mismatch and has minimum influence on master-slave synchronization quality. However, multi-parameter mismatch gives rise to more complex effects. Compared with the traditional semiconductor laser systems, this system can maintain “pseudo-orthogonality” over a wider range of parameters, thus achieving higher security and lower channel interference. This research lays a theoretical foundation for chaos synchronization based on NLs and provides new insights for designing secure, stable, and efficient optical communication systems.

Keywords:

Authors and contacts

Corresponding author: MU Penghua, ph_mu@ytu.edu.cn ; XU Yuan, xuyuan@ytu.edu.cn

Funds: Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2020QF090) and the Yantai City 2023 School-Land Integration Development Project Fund, China (Grant No. 2323013-2023XDRH001).

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参数	符号	参考值
约束因子	$\varGamma $	0.645
载流子寿命/ns	${\tau _{\text{n}}}$	1
光子寿命/ps	${\tau _{\text{p}}}$	0.36
反馈延迟/ns	${\tau _{\text{d}}}$	0.2
差分增益/(cm³·s^–1)	${g_n}$	1.64 × 10^–6
透明载流子密度/cm^–3	${N_0}$	1.1 × 10^–18
增益饱和因子/cm³	$\varepsilon $	2.3 × 10^–17
线宽增强因子	$\alpha $	5
活性区体积/cm³	${V_{\text{α }}}$	3.96 × 10^–13
纳米激光器的波长/nm	${\lambda _0}$	1591
激光面反射率	$R$	0.85
注入比	${R_{{\text{inj}}}}$	0—0.1
外镜的功率反射率	${R_{{\text{ext}}}}$	0.95
折射率	$n$	3.4
空腔长度/μm	$L$	1.39
反馈耦合分数	$f$	0—0.9

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Vol. 74, Issue 5 - 2025-03-05

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