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On-chip optical isolation via unidirectional Bloch oscillations in a waveguide array.

Pradeep Kumar¹, Miguel Levy

¹Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA.

|October 9, 2012

Summary

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We demonstrate a novel optical isolator using magneto-optic effects in asymmetric waveguide arrays. This device achieves high isolation (36 dB) for telecommunication wavelengths by controlling light propagation direction.

Area of Science:

Photonics and Waveguide Optics
Magneto-Optics
Nonlinear Optics

Background:

Optical isolators are crucial components in photonic systems, preventing back-reflections.
Existing isolators often suffer from size, insertion loss, or bandwidth limitations.
Magneto-optic effects offer a promising route for miniaturized, non-reciprocal devices.

Purpose of the Study:

To propose and theoretically analyze a novel optical isolator based on optical Bloch oscillations.
To leverage the unidirectionality of Bloch oscillations in magneto-optic asymmetric waveguide arrays for optical isolation.
To achieve high isolation ratios at telecommunication wavelengths.

Main Methods:

Utilizing the optical Bloch oscillation phenomenon in a magneto-optic asymmetric waveguide array.

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Designing a device with a silicon-on-insulator substrate and a magnetic garnet cover layer.

Exploiting the transverse-magnetic (TM) mode nonreciprocal phase shift effect.

Main Results:

Demonstrated unidirectionality of optical Bloch oscillations for optical isolation.
Achieved a high isolation ratio of 36 dB for forward- and backward-propagating waves.
Operates effectively at the 1.55 μm telecommunication wavelength.

Conclusions:

The proposed magneto-optic waveguide array offers a viable solution for compact optical isolators.
The design effectively utilizes nonreciprocal phase shifts for unidirectional light propagation.
This approach holds potential for integrated photonic circuits requiring robust optical isolation.