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为了研究基于微光纤的谐振器中的慢光效应,设计并制作了并联结构的微光纤双结谐振器.基于环形谐振器和方向耦合器理论,提出并联结构微光纤双结谐振器的理论模型,分析了该谐振器中光场传输和耦合的方向,推导了该谐振器中输出光场与输入光场之间的数学解析式和群延时表达式.通过数值模拟,给出了有关该谐振器的透射光谱和群延时,分析了群延时与透射光谱中谐振波长的对应关系.数值结果表明在该谐振器中,大的群延时能够在具有大消光比的谐振波长处产生.实验制作了一个并联结构的微光纤双结谐振器,测得的透射光谱与理论模拟相一致,验证了该谐振器理论分析的正确性.利用示波器上脉冲延时的方法,搭建了慢光延时测量系统,测得该谐振器中大约75ps的群延时,远大于现有文献中的值.该谐振器可用于微纳光学的数据延时线、光学开关和光学存储等.
In order to study the slow light effect in the micro-fiber-based resonator, a parallel-structured micro-fiber double-junction resonator is designed and fabricated.Based on the ring resonator and the directional coupler theory, a theoretical model of the parallel structure micro- , The direction of light field transmission and coupling in the resonator is analyzed and the mathematical expressions and group delay expressions of the output light field and the input light field in the resonator are deduced.Through the numerical simulation, The transmission spectra and the group delay of the resonator are used to analyze the correspondence between the group delay and the resonance wavelength in the transmission spectrum.The numerical results show that the large group delay can be generated at the resonance wavelength with large extinction ratio The experiment results show that the transmission spectrum of the micro-fiber double-junction resonator with parallel structure is consistent with the theoretical simulation, which verifies the correctness of theoretical analysis of the resonator.Using the method of pulse delay on the oscilloscope, Time delay measurement system, the group measured about 75ps group delay, far greater than the value of the existing literature.The resonator can be used for micro-nano optical data delay line, optical switches and optical storage, etc. .