BPN493: Ultra-Low-Loss Hollow-Core Waveguides for Integrated Photonic Delay


Many optical devices can now be integrated on-chip, providing analogous benefits to those seen with the shift to electrical integration. However, integrated optical waveguides remain very lossy compared to their discrete component equivalent, optical fiber. This shortcoming presents a barrier to the introduction of integrated photonic delay lines with delay times on the order of hundreds of nanoseconds or more. DARPA has created the Integrated Photonic Delay (iPhoD) program to promote the development of integrated waveguides that are competitive with optical fiber in propagation loss. By replacing fiber, these waveguides will reduce the size and weight of devices requiring long delay lines, as well as allow greater precision in specifying the amount of time delay. Our approach to this challenge is to eschew traditional integrated waveguides made of materials such as silica, and instead develop on-chip hollow waveguides with an air core and highly reflective wall surfaces. Confining the optical power in an air core avoids the problem of bulk losses due to imperfections in the grown or deposited materials traditionally used for integrated waveguide fabrication.

Project end date: 02/01/12

Anthony M. Yeh
Karen E. Grutter
Publication date: 
August 16, 2011
Publication type: 
BSAC Project Materials (Final/Archive)
PREPUBLICATION DATA - ©University of California 2011

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