Abstract
A Y-branch TE-TM mode splitter using a multilayered waveguide is proposed. This mode splitter is based on a form birefringence which is inherent in a multilayered medium. Owing to its form birefringence, the multilayered waveguide has different propagation characteristics for different polarizations. The Y-branch waveguide in which one branch arm is multilayered results in efficient TE-TM mode splitting operation. An example of the numerical design is shown and the field propagation and the extinction ratios of the splitter are calculated using the coupled mode equations. The calculated extinction ratios for TE and TM modes are -47.92 dB and -33.55 dB, respectively, with a branching angle of 0.06 degrees. The device was fabricated and mode splitting operation was observed.
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