实验探究：1550nm VCSEL在FBG反馈下的混沌时延特征

60 浏览量更新于2024-08-27 收藏 502KB PDF 举报

"该实验研究了1550纳米垂直腔面发射激光器(VCSEL)在光纤布拉格光栅(FBG)反馈下的混沌输出的时间延迟签名(TDS)。通过使用自相关函数(ACF)和互信息(MI)定量识别混沌的TDS。对于不同的偏置电流，随着反馈强度的变化，TDS的演化表现出差异，因为FBG提供了波长选择性的反馈。此外，基于FBG反馈VCSEL（FBGF-VCSEL）在反馈强度和偏置电流参数空间中的TDS映射，可以确定最佳TDS抑制区域，其中FBGF-VCSEL的主要极化模式受到控制，从而揭示了混沌动力学的复杂性与可调性。" 本文是一篇关于光学通信领域中的混沌理论与激光技术的研究报告，主要探讨了1550纳米波长的VCSEL在FBG反馈作用下混沌输出的时间延迟特性。时间延迟签名(TDS)是描述混沌系统动态行为的关键指标，它反映了信号之间的相关性和信息传输的效率。在实验中，研究人员通过分析ACF和MI，这两种统计方法有助于量化识别混沌输出的时间延迟特征。首先，文章指出，VCSEL在不同偏置电流下，由于FBG提供的波长选择性反馈，其TDS会呈现不同的演变模式。偏置电流决定了激光器的工作状态，而FBG的反馈则可以调控激光的输出特性，包括其混沌行为。这种波长选择性反馈机制为理解和控制混沌系统提供了新的视角。其次，通过在反馈强度和偏置电流的参数空间中构建TDS映射，研究人员能够找到最佳的TDS抑制区域。在这个区域内，主要的极化模式得以控制，这意味着可以通过调整这两个参数来优化系统的混沌行为，这对于混沌控制和利用具有重要意义。例如，在光通信中，混沌可以用于提高保密性，但过度的混沌可能导致信号质量下降，因此对TDS的控制至关重要。这篇研究揭示了1550纳米VCSEL在FBG反馈下混沌动力学的复杂性，并提供了一种定量分析和控制混沌行为的方法。这一发现对于理解混沌激光器的工作原理、优化通信系统的性能以及探索混沌在光学领域的潜在应用具有深远影响。未来的研究可能进一步探讨如何利用这些发现来改进现有的光纤通信系统或开发新型的混沌光学设备。

Experimental investigation on the time-delay signature

of chaotic output from a 1550 nm VCSEL subject

to FBG feedback

Zhu-Qiang Zhong,

Zheng-Mao Wu,

1,2

and Guang-Qiong Xia

School of Physical Science and Technology, Southwest University, Chongqing 400715, China

e-mail: zmwu@swu.edu.cn

*Corresponding author: gqxia@swu.edu.cn

Received October 11, 2016; revised November 15, 2016; accepted November 16, 2016;

posted November 18, 2016 (Doc. ID 278477); published December 12, 2016

The time-delay signature (TDS) of chaos output in a 1550 nm vertical-cavity surface-emitting laser (VCSEL) subject

to fiber Bragg grating (FBG) feedback is investigated experimentally. Autocorrelation function (ACF) and mutual

information (MI) are used for quantitatively identifying the TDS of chaos. For various bias currents, the TDS evo-

lution with the feedback strength is different, as the FBG provides wavelength-selective feedback. Furthermore,

based on the TDS map of the FBG feedback VCSEL (FBGF-VCSEL) in the parameter space of feedback strength and

bias current, the optimal TDS suppression regions, where the dominant polarization mode of FBGF-VCSEL locates

at the edge of the main lobe of FBG reflection spectrum, have been determined. Finally, for comparative purpose,

the TDS of chaos in mirror feedback VCSEL (MF-VCSEL) also has been presented, and the results show that an

OCIS codes: (140.5960) Semiconductor lasers; (060.3735) Fiber Bragg gratings; (190.3100) Instabilities and

chaos.

https://doi.org/10.1364/PRJ.5.000006

1. INTRODUCTION

Vertical-cavity surface-emitting lasers (VCSELs) have been

widely adopted in various applications such as optical com-

munication, optical storage, parallel optical links, and so on

[1–4]. Compared with edge-emitting semiconductor lasers

(EELs), VCSELs have many beneficial features such as

low power consumption, low threshold current, low cost,

on-wafer testing capability, high bandwidth modulation, and

easy large-scale integration into 2D arrays, etc. [5,6]. VCSELs

subject to suitable optical feedback can generate high

Kaplan–Yorke dimension optical chaotic output and then ap-

ply to optical-chaos-based communication [1,2,7]. However,

the chaotic output from external cavity feedback VCSELs

(ECF-VCSELs) usually retains a time-delay signature (TDS)

originated from the optical round trip between the VCSEL

and the external feedback mirror [8–14], which may provide

some possibilities to reconstruct the system by adopting

time-series analysis techniques for delayed systems [15–17]

and then threaten the system security. As a result, the TDS

suppression has been a research hot spot in the field related

to chaos generation and applications based on delayed

VCSELs in recent years.

So far, many schemes have been proposed for suppressing

the TDS of chaos in VCSELs. Xiang et al. numerically inves-

tigated the TDS of chaos in VCSELs with single variable-

polarization optical feedback (VPOF) [8]. Priyadarshi et al.

experimentally demonstrated the TDS concealment in VCSELs

subject to VPOF [9]. By introducing another feedback cavity,

Lin and co-workers experimentally verified that the TDS in

a single transverse and multi-transverse mode VCSEL with

double-cavity polarization-rotated feedback can be effectively

suppressed [10,11]. Elsonbaty et al. theoretically investigated

the TDS of chaos in a hybrid optical and electro-optic feed-

back VCSEL and successfully achieved TDS of intensity

and phase simultaneously suppressed chaotic carriers [12].

Liu et al. proposed a three cascade-coupled configuration of

VCSELs and numerically investigated the TDS and chaotic

bandwidth of the output from the VCSELs [13]. Hong et al.

experimentally verified the performance of the three-

cascaded VCSELs in suppressing the TDS of chaos as well

as the effect of injecting chaotic bandwidth on the TDS

suppression [14]. It should be noted that, for the above-

mentioned schemes, external optical feedback is provided

by mirrors. Recently, Li et al. proposed and experimentally

demonstrated that, by using a fiber Bragg grating (FBG) as

a reflector, the TDS of chaos output from an EEL can be

suppressed [18,19]. Different from conventional reflected

mirrors, an FBG can provide distributed feedback along

its length, and the group velocity dispersion of FBG can

weaken and suppress the TDS. We extended the FBG feed-

back to VCSELs and theoretically studied the TDS of chaos

in VCSELs subject to variable-polarization FBG feedback

[20] as well as the polarization-resolved TDS of chaos in an

FBG feedback VCSEL (FBGF-VCSEL) [21]. Even so, no ex-

perimental investigation on the TDS of chaotic output from

an FBGF-VCSEL has been carried on.

In this work, the TDS of chaotic output from a 1550 nm

VCSEL subject to FBG feedback is experimentally investi-

gated. By recording the time series, power spectrum, and

optical spectrum of the FBGF-VCSEL output, the dynamical

route to chaos of the system is examined. Moreover, with

the help of an autocorrelation function (ACF) and mutual

6 Photon. Res. / Vol. 5, No. 1 / February 2017 Zhong et al.

下载后可阅读完整内容，剩余4页未读，立即下载

weixin_38509656

粉丝: 7
资源: 908

实验探究：1550nm VCSEL在FBG反馈下的混沌时延特征

Experimental investigation and thermodynamic calculation of the phase equilibria in the Cu-Cr-W and Cu-Cr-Mo systems

Theoretical and experimental investigation of the mode-spacing of fiber Bragg grating Fabry-Perot cavity

Experimental study of the time-resolved reflectivity of chromium film

Experimental-Investigation-into-the-Influence-of._通讯编程文档_PDF_

Experimental investigation of a seven-element hexagonal fiber coherent array

Experimental investigation on bit-rate-adaptive software synchronous optical sampling

Simultaneous Generation of Two Sets of Time Delay Signature Eliminated Chaotic Signals by Using Mutually Coupled Semiconductor Lasers

Experimental investigation on laser-induced surface damage threshold of Nd-doped phosphate glass

An experimental investigation on two-dimensional shape-based diffuse optical tomography

Experimental investigation on the improvement of SBS characteristics by purifying the mediums

最新资源