Passive Ti:LiNbO3 channel waveguide TE-TM mode splitter

Abstract
A passive compact TE‐TM mode splitter has been demonstrated using Ti:LiNbO3 channel waveguides. Its operation is based on the interference between the two guided modes of a double‐mode waveguide segment connecting single‐mode input and output guides. A device made using one set of design parameters has splitting ratios of 12 dB for both polarizations. Another device made using different parameters has a splitting ratio of 17 dB for TM modes. The devices are capable of low‐loss, broadband operation.