,Multi-scale polarisation phenomena

• 作 者: Vladimir Kalashnikov Sergey V Sergeyev Gunnar Jacobsen Sergei Popov Sergei K Turitsyn
• 机 构: AIPT, Aston University, Birmingham, West Midlands B4 7ET, UK“,”Acreo, Electrum 236, SE-16440, Kista,
• 出 处: 光：科学与应用（英文版）
• 发表日期: 2016年1期
• 关键词: fibre Raman amplifier multi-scale methods polarisation stochastic calculations

Multi-scale methods that separate different time or spatial scales are among the most powerful techniques in physics,especially in applications that study nonlinear systems with noise.When the time scales (noise and perturbation) are of the same order,the scales separation becomes impossible.Thus,the multi-scale approach has to be modified to characterise a variety of noise-induced phenomena.Here,based on stochastic modelling and analytical study,we demonstrate in terms of the fluctuation-induced phenomena and Hurst R/S analysis metrics that the matching scales of random birefringence and pump-signal states of polarisation interaction in a fibre Raman amplifier results in a new random birefringence-mediated phenomenon,which is similar to stochastic anti-resonance.The observed phenomenon,apart from the fundamental interest,provides a base for advancing multi-scale methods with application to different coupled nonlinear systems ranging from lasers (multimode,mode-locked,random,etc.) to nanostructures (light-mediated conformation of molecules and chemical reactions,Brownian motors,etc.).