A Novel Optical Polarization Splitter Using a Dimensionally Tapered Velocity Coupler

Masashi HOTTA  Masahiro GESHIRO  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.11   pp.1722-1725
Publication Date: 1994/11/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory)
polarization splitter,  tapered velocity coupler,  electro-optic effects,  LiNbO3,  finite difference method,  

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A new polarization splitter at optical frequencies is proposed. The basic structure of the device is a tapered velocity coupler which is composed of a straight and a dimensionally tapered slab waveguide on a LiNbO3 substrate. The numerical results obtained with the finite difference method indicate that extinction ratios of polarization less than 2% for both TE and TM modes are possible of realization under moderate control voltages and that the splitting characteristics are stable over a wide range of frequencies.