We propose a circulator consisting of a ring resonator coupled to three waveguides with Bragg reflectors at one end of each waveguide. A magneto-optically active material placed inside the ring resonator causes the two counter-propagating modes to split in resonance frequency, which can be exploited for perfect circulation by properly adjusting the coupling between the three waveguides and the ring. Such a device features a transmission spectrum that is similar to three-port photonic crystal circulators but is much simpler to build as it only contains elements that have already been experimentally realized.
© 2014 Optical Society of America
Original Manuscript: January 8, 2014
Manuscript Accepted: January 24, 2014
Published: March 6, 2014
Dirk Jalas, Alexander Yu. Petrov, and Manfred Eich, "Optical three-port circulators made with ring resonators," Opt. Lett. 39, 1425-1428 (2014)