We report tunable two-stage self-coupled optical waveguide (SCOW) resonators composed of a pair of mirror-imaged single SCOW resonators connected by a phase shifter in between. Experimental results show that the coupled-resonator-induced-transparency and high-order bandstop filtering characteristics can be obtained in the transmission spectra of the devices with two different configurations. The resonance spectrum can be tuned by using either a p-i-p microheater or a p-i-n diode in the phase shifter. Our theoretical modeling based on the transfer matrix method has a good agreement with the experimental results.
© 2013 Optical Society of America
Original Manuscript: December 26, 2012
Revised Manuscript: March 2, 2013
Manuscript Accepted: March 5, 2013
Published: April 1, 2013
Zhi Zou, Linjie Zhou, Xiaomeng Sun, Jingya Xie, Haike Zhu, Liangjun Lu, Xinwan Li, and Jianping Chen, "Tunable two-stage self-coupled optical waveguide resonators," Opt. Lett. 38, 1215-1217 (2013)