Fabrication and characterization of a new inverse constant-loss taper (CLT)

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We have designed a new, optimal, inverse taper structure to guide light on chip from an external laser. This taper helps convert the optical mode from a tightly confined, Si-microphotonic waveguide to a standard, large-mode-diameter, optical fiber. Without such a device, ~95% of the light is lost and with such a device only ~10% is lost. Teraxion, our industrial collaborator, has a strong need for such a device. They are moving away from coupling light to their devices using vertical gratings and moving towards butt-coupled tapers, such as the device that we are proposing to make here. Butt-coupled tapers offer the advantages of higher bandwidth and reduced alignment constraints. Here we propose to build the first experimental demonstration of our modeled, optimal. inverse taper structures.