Time delay signature suppressed broadband chaotic laser for high-speed all-optical true random number generator

用于高速全光真随机数发生器的时延特征抑制宽带混沌激光器

• 批准号: RTI-2017-00631
• 负责人: Bao, Xiaoyi
• 金额: $ 10.93万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=616731
• 关键词: Time; delay; signature; suppressed; broadband

Truly random numbers are important for scientific computation, stochastic modeling, secure communications and quantum key distribution in quantum cryptography systems. Chaotic lasers provide high quality randomness for truly random number generation. In chaos-based random number generator, the bandwidth of the chaotic laser dominates the generated bit rate which is limited around 35 GHz to date and they require significant post-signal processing. In typical chaotic laser system, additional competition dynamic from external optical feedback is essential for a broadband chaotic output. However, the unpredictable, unreproducible and statistically unbiased features cannot be met by almost all of chaotic lasers due to the time delay signature in the generated optical chaos. This is attributed by the basic building block of chaotic laser generation via different laser injection with a fixed delay time to create chaotic nature. As a result, the time delay signature of the generated chaotic laser output induced the predictability, which disqualified them from random number generation. To overcome the above-mentioned bottleneck, we propose a novel chaotic laser generation with a well extended bandwidth as well as free from time delay signature. By dual detuning external light injections with distributed random periods with randomized optical feedback strength, the bandwidth of the proposed chaotic laser would combine the multiple gain spectra and be well extended up to 50GHz. In particular, random distributed optical feedback through our proposed random fiber grating are implemented to remove the temporal predictability and suppress the time delay signature, which will be demonstrated for the first time. The requested 50GHz Signal Analyzer is crucial for the characterization of the chaos bandwidth in electrical frequency domain with the upper limit range of 50 GHz, as well as the identification of the time delay signature suppression. The proposed chaotic laser would build up a high speed true random bit generator timely to give Canada competitive edge in this field, paving a way for practical application in secure communication. This random grating based chaotic laser can be used for quantum communication, microwave photonics source and neutral dynamics. It opens doors for many local collaboration, as well as international collaborations in academic and industry of telecom and biomedical instrumentation.

真正的随机数对于量子密码系统中的科学计算、随机建模、安全通信和量子密钥分发具有重要意义。混沌激光为真正的随机数生成提供了高质量的随机性。在基于混沌的随机数发生器中，混沌激光器的带宽占主导地位，其产生的码率目前被限制在35 GHz左右，并且需要进行大量的信号后处理。在典型的混沌激光系统中，来自外部光反馈的附加竞争动力学对于宽带混沌输出是必不可少的。然而，由于产生的光学混沌中的时延特征，几乎所有的混沌激光器都不能满足不可预测、不可重现和统计无偏的特征。这归因于混沌激光产生的基本构件是通过固定延迟时间的不同激光注入来产生混沌性质。结果，产生的混沌激光输出的时延特征导致了可预测性，这使得它们不能产生随机数。为了克服上述瓶颈，我们提出了一种新的混沌激光产生方案，该方案具有很好的带宽扩展特性，并且没有时延签名。通过具有随机光反馈强度的分布随机周期的双失谐外部光注入，所提出的混沌激光器的带宽将合并多个增益谱，并被很好地扩展到50 GHz。特别是，通过我们提出的随机光纤光栅实现了随机分布式光反馈，以消除时间可预测性和抑制时延特征，这将是第一次被证明。所要求的50 GHz信号分析仪对于表征电频域的混沌带宽(上限范围为50 GHz)以及识别时延特征抑制是至关重要的。所提出的混沌激光器将适时地构建高速真随机比特发生器，使加拿大在该领域具有竞争优势，为其在保密通信中的实际应用铺平了道路。这种基于随机光栅的混沌激光器可用于量子通信、微波光子源和中性动力学。它为电信和生物医学仪器的学术和工业领域的许多本地合作以及国际合作打开了大门。