We propose to use the unidirectionality of the optical Bloch oscillation phenomenon achievable in a magneto-optic asymmetric waveguide array to achieve optical isolation. At the 1.55 μm telecommunication wavelength, our isolator design exhibits an isolation ratio of 36 dB between forward- and backward-propagating waves. The proposed design consists of a waveguide array made in a silicon-on-insulator substrate with a magnetic garnet cover layer. A key role is played by the transverse-magnetic mode nonreciprocal phase shift effect.
© 2012 Optical Society of America
Original Manuscript: July 2, 2012
Manuscript Accepted: July 22, 2012
Published: September 5, 2012
Pradeep Kumar and Miguel Levy, "On-chip optical isolation via unidirectional Bloch oscillations in a waveguide array," Opt. Lett. 37, 3762-3764 (2012)