上海交通大学智能微波光波融合创新中心（imLic）博士生杨涌澜同学的工作—Ultrabroad Brillouin instantaneous frequency measurement with a designed linear system response的相关研究成果近期被Optics Letters杂志接收，该工作得到了国家重点研发计划和国家自然科学基金的资助。该研究团队前期已提出基于受激布里渊散射的瞬时频率测量技术。在此基础上，研究团队进一步分析受激布里渊散射系统响应与泵浦频谱之间的理论关系，通过设计泵浦信号的调幅调频方式，优化受激布里渊系统响应，提升系统响应的线性度，最终实现超宽带瞬时频率测量。
摘要:We demonstrate an ultrabroad instantaneous frequency measurement (IFM) based on stimulated Brillouin scattering (SBS) with a designed linear system response. The linear system response is found to be the key factor that broadens the system bandwidth. It is realized by designing the sweeping method of frequency and amplitude of the local pump signal. With the improvement of linearity, the measurement error is decreased and the bandwidth of SBS-based IFM is consequently enlarged. A Costas frequency modulated signal with an instantaneous bandwidth of 10.5 GHz is successfully measured by the designed system response. Further optimization of pump signal’s characteristics extends the system bandwidth to 14.5 GHz. The measurement error of a linear frequency modulated (LFM) signal ranging from 6 GHz to 20.5 GHz is less than 1% of the instantaneous bandwidth.