Abstract
Nonreciprocal optical devices are essential for laser protection,modern optical communication and quan-tum information processing by enforcing one-way light propagation.The conventional Faraday magneto-optical nonreciprocal devices rely on a strong magnetic field,which is provided by a permanent magnet.As a result,the isolation direction of such devices is fixed and severely restricts their applications in quantum networks.In this work,we experimentally demonstrate the simultaneous one-way transmission and unidirectional reflection by using a magneto-optical Fabry-Pérot cavity and a magnetic field strength of 50 mT.An optical isolator and a three-port quasi-circulator are realized based on this nonreciprocal cavity system.The isolator achieves an isolation ratio of up to 22 dB and an averaged insertion loss down to 0.97 dB.The quasi-circulator is realized with a fidelity exceeding 99％and an overall survival probability of 89.9％,corresponding to an insertion loss of～0.46 dB.The magnetic field is provided by an electromagnetic coil,thereby allowing for reversing the light circulating path.The reversible quasi-circulator paves the way for building reconfigurable quantum networks.
基金项目
国家重点研发计划(2019YFA0308700)
国家自然科学基金(11890704)
国家自然科学基金(92365107)
国家自然科学基金(12305020)
Program for Innovative Talents and Teams in Jiangsu(JSSCTD202138)
Shccig-Qinling Program()
中国博士后科学基金(2023M731613)
Jiangsu Funding Program for Excellent Postdoctoral Talent(2023ZB708)
维普
万方数据