Asymmetric, periodically loaded waveguide for polarization rotat

Details Asymmetric, periodically loaded waveguide for polarization rotat Asymmetric, periodically loaded waveguide for polarization rotat

1992-04-07

1993-09-07

Ullah, Akm E.

Optical waveguides

Polarization without modulation

359483, G02F 101

Patent

active

052436691

ABSTRACT:
Polarization rotation is achieved in an exemplary embodiment in an optical waveguide by augmenting the waveguide structure with a plurality of spaced-apart sections for loading the refractive index of the waveguide to cause a lateral asymmetry in the refractive index profile of the waveguide viewed in the plane transverse to the waveguide longitudinal axis. Each spaced-apart section induces non-zero coupling between the principal orthogonal polarization modes. Phase matched coupling between the principal orthogonal polarization modes is achieved by spacing the sections periodically by a distance .LAMBDA. equal to .lambda./.DELTA.N where .lambda. is the propagation wavelength in the waveguide and .DELTA.N is the difference between the effective refractive indices for the principal orthogonal polarization modes. Realizations of the waveguide structure are shown using Group III-V semiconductor rib waveguide structures.

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