High-Speed Random Bit Generation via Brillouin Random Fiber Laser With Non-Uniform Fibers

A bidirectional pumping Brillouin random fiber laser based on a non-uniform fiber is proposed and demonstrated for truly random number generation with enhanced bit rate. Numerical simulation indicates that, thanks to the unique distributed Brillouin gain profile along the non-uniform fiber, random lasing oscillation within a broadband Brillouin gain can be established by the mutual effect of Brillouin scattering and enhanced Rayleigh scattering, providing physical entropy source for truly random number generation. The poof-of-concept experiments demonstrate a truly random number with a bit rate of 71 Mbps, which significantly breaks through the limitation of the intrinsic Brillouin bandwidth (similar to 10 MHz) in communication fibers.

提出并演示了一种基于非均匀光纤的双向泵浦布里渊随机光纤激光器，用于产生具有更高比特率的真随机数。数值模拟表明，由于沿非均匀光纤独特的分布式布里渊增益分布，通过布里渊散射和增强的瑞利散射的相互作用，可以在宽带布里渊增益范围内建立随机激光振荡，为真随机数的产生提供物理熵源。原理验证实验展示了一种比特率为71Mbps的真随机数，这极大地突破了通信光纤中固有布里渊带宽（约10MHz）的限制。