OPTICALLY-INJECTED MULTI-SECTION LASERS FOR CHAOTIC ENCRYPTION SYSTEMS

用于混沌加密系统的光注入多段激光器

• 批准号: EP/D078628/1
• 负责人: Michael Adams
• 金额: $ 37.6万
• 依托单位: University of Essex
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD078628%2F1
• 关键词: OPTICALLY; INJECTED; MULTI; SECTION; LASERS

Stability of the operation of semiconductor lasers is very sensitive to injection into the laser cavity of the optical signal generated by another laser or due to an external reflection of the output light. The non-linear interaction between the injected beam and the active cavity medium results in the chaotic operation of the laser. Although this state is undesirable in usual applications of lasers, the regime of chaotic oscillations opened a new avenue for enhancement of secure optical communication and development of novel techniques for signal encryption in which signal encoding is performed through continuous modulation of a dynamic variable of the transmitting laser device.Up to now, complex optical cryptosystems with complicated chaotic dynamics implemented in various research laboratories were mainly based on relatively simple single-section semiconductor laser diodes. At the same time, the multi-section semiconductor lasers with composite optical cavities, which include passive and active sections and several gratings, have inherently high potential for exhibiting very complicated stochastic dynamical properties. As far as the chaotic regime is concerned, this will result in the high-dimensional chaos that is required to enhance the confidentiality of optical cryptographic systems. This feature combined with recent tremendous technological progress in the development of commercial multi-section tunable laser diodes makes a comprehensive study of chaotic dynamics in these lasers and their potential for optical encryption systems timely and important from both fundamental and applied point of views.The distinctive feature of the composite systems is that in general they are composed of media or sections with an inhomogeneous spatial variation of the optical parameters, such as refractive index, material gain, optical losses, nonuniform gratings, coupling, etc. In addition to this so-called structural inhomogeneity, some of the optical parameters could be functions of the device operation conditions (so-called functional inhomogeneity). For example, the refractive index can be modified in some parts of the composite structure by current injection or by intrinsic phenomena such as spatial hole burning or gain nonlinearities (gain compression). The key issue here is that in general the characteristic spatial scale of these variations can be of the same order as the wavelength of the propagating light, and because of this the usual coupled-mode theory approach is not applicable here. We will develop an appropriate new formalism and technique to describe the electromagnetic wave propagation and interaction in such systems. This general approach can be applied to various optically inhomogeneous systems, such as multi-electrode multi-section lasers or integrated active/passive photonic circuits.This proposal is devoted to a study of the stochastic dynamics of multi-section semiconductor tunable lasers subject to external optical injection or to optoelectronic feedback. In order to achieve this goal we will develop and apply a new general approach to study spatio-temporal properties of the optical fields, including chaos, noise and related quantum and classical effects in the composite optoelectronic systems. The lasers that operate in chaotic regime can potentially be used as an alternative to classical encryption techniques based on numerical algorithms. Therefore, the main thrust of the project is related to application of multi-section tunable lasers for synchronised chaotic optical encryption systems and communication cryptography.The developed theory will be tested against very recent experimental results on synchronised chaotic regimes of multi-section lasers subject to optical injection obtained in our and other laboratories.

半导体激光器操作的稳定性非常敏感地注入另一个激光器产生的光学信号的激光腔或由于输出光的外部反射。注射束和活跃腔介质之间的非线性相互作用导致激光的混乱操作。尽管这种状态在激光器的通常应用中是不可取的，但混乱的振荡制度为增强了信号加密技术的安全光学通信和新型技术开发的新途径，在该途径中，信号编码是通过连续调制的，通过连续调节了传播激光器的动力学，复杂的CRYSTERITY CRYSTIOL SYTORITIC CRYTISTION CRYTISTION CRYTISTION CRYTISTION CRYTISTION STEMITION CHAA的动力学来执行，并进行复杂的CRYSTERITY SENTICS。基于相对简单的单部分半导体激光二极管。同时，具有复合光腔的多段半导体激光器（包括被动和主动截面）以及几个光栅具有固有的高潜力，可表现出非常复杂的随机动力学特性。就混乱的制度而言，这将导致高维混乱，这是增强光学加密系统的机密性所需的。 This feature combined with recent tremendous technological progress in the development of commercial multi-section tunable laser diodes makes a comprehensive study of chaotic dynamics in these lasers and their potential for optical encryption systems timely and important from both fundamental and applied point of views.The distinctive feature of the composite systems is that in general they are composed of media or sections with an inhomogeneous spatial variation of the optical parameters, such as折射率指数，材料增益，光损耗，不均匀的光栅，耦合等。除了这种所谓的结构不均匀性外，某些光学参数还可能是设备操作条件的函数（所谓的功能性不均匀性）。例如，可以通过电流注入或固有现象（例如空间孔燃烧或获得非线性（增益压缩））在复合结构的某些部分中修改折射率。这里的关键问题是，通常，这些变化的特征空间尺度可以与传播光的波长相同，因此，因此，这里通常不适用通常的耦合模式理论方法。我们将开发一种适当的新形式主义和技术来描述此类系统中的电磁波传播和相互作用。这种通用方法可以应用于各种光学上不均匀的系统，例如多电极多部分激光器或集成的主动/被动光子电路。该提案专门研究对多截面可调激光的随机动力学的研究，这些动力学又是外部光学注射。为了实现这一目标，我们将开发并应用一种新的通用方法来研究光场的时空特性，包括混乱，噪声以及相关的量子和经典效应，并在复合光电系统中。在混乱状态下运行的激光器可以用作基于数值算法的经典加密技术的替代方法。因此，该项目的主要目的是与多节调谐激光器在同步混沌光学加密系统和通信密码学方面的应用有关。开发的理论将针对我们和其他实验室中遭受光学伤害的多节激光器的同步混乱方案的最新实验结果进行测试。

项目成果

Nonlinear Dynamics of Multi-Section Tunable Lasers

• DOI: 10.1109/jqe.2010.2046881
• 发表时间: 2010-06
• 期刊: IEEE Journal of Quantum Electronics
• 影响因子: 2.5
• 作者: D. Labukhin;C. Stolz;N. Zakhleniuk;R. Loudon;M. Adams

Dynamics of Optically-Injected Semiconductor Lasers Using the Travelling-Wave Approach

• DOI: 10.1109/jqe.2009.2030511
• 发表时间: 2010-01
• 期刊: IEEE Journal of Quantum Electronics
• 影响因子: 2.5
• 作者: C. Stolz;D. Labukhin;N. Zakhleniuk;Michael J. Adams

Locking bandwidth of optically injected Fabry-Perot semiconductor lasers for high injection strengths

锁定光注入法布里-珀罗半导体激光器的带宽以实现高注入强度

• DOI: 10.1049/iet-opt:20080029
• 发表时间: 2008
• 期刊: IET Optoelectronics
• 影响因子: 1.6
• 作者: Stolz C

Detuning Boundaries of Linear and Nonlinear Dynamics in a System of Coupled Lasers

耦合激光器系统中线性和非线性动力学的失谐边界

• DOI: 10.1109/jstqe.2015.2422292
• 发表时间: 2015
• 期刊: IEEE Journal of Selected Topics in Quantum Electronics
• 影响因子: 4.9
• 作者: Cemlyn B

Power fluctuations of a weakly optically-injected semiconductor laser in a period-one state

• DOI: 10.1016/j.optcom.2009.02.028
• 发表时间: 2009-05
• 期刊: Optics Communications
• 影响因子: 2.4
• 作者: C. Stolz;D. Labukhin;N. Zakhleniuk;R. Loudon;M. Adams