Title :
Polarization Rotators in Add-Drop Filter Systems With Double-Ring Resonators
Author :
Guoqiang Chen ; Lixue Chen ; Weiqiang Ding ; Fangkui Sun ; Rui Feng
Author_Institution :
Phys. Dept., Harbin Inst. of Technol., Harbin, China
Abstract :
A design of highly integrated polarization rotators (PRs) with double-ring resonators in add-drop filter systems is demonstrated theoretically. Based on mode-evolution theory and 3D finite-difference time-domain simulation, two vertically stacked microrings with dislocation are designed and optimized, which efficiently decreases the size of PR to a double-ring structure with a radius of <;3.5 μm for the wavelength of 1.55 μm in a silicon-on-isolator system. Numerical simulations obtain an extinction ratio (ER) of -22 dB and an insertion loss of 0.07 dB with practical material parameters. This PR combines the advantages of the periodic spectrum of ring resonators and add-drop filtering functionality. The method and result presented here can be valuable for applications in polarization-diversity circuits.
Keywords :
dislocations; finite difference time-domain analysis; integrated optics; light polarisation; optical design techniques; optical filters; optical isolators; optical losses; optical resonators; optical rotation; silicon-on-insulator; 3D finite-difference time-domain simulation; Si; add-drop filter systems; dislocation; double-ring resonators; double-ring structure; extinction ratio; insertion loss; integrated polarization rotators; loss 0.07 dB; material parameters; mode-evolution theory; numerical simulations; periodic spectrum; polarization-diversity circuits; silicon-on-isolator system; vertically stacked microrings; wavelength 1.55 mum; Couplings; Erbium; Optical losses; Optical resonators; Optical waveguides; Optimized production technology; Resonant frequency; Integrated optics; microcavity; polarization rotators; resonators;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2310251
