Fiber-to-chip coupler designed using an optical transformation

ArticleinOptics Express 20(13):14705-13 · June 2012with15 Reads
Impact Factor: 3.49 · DOI: 10.1364/OE.20.014705 · Source: PubMed


    An integrated silicon photonics coupler for fiber to waveguide conversion was designed employing a transformation optics approach. Quasi-conformal mapping was used to obtain achievable material properties, which were realized by a distorted hexagonal lattice of air holes in silicon. The coupler, measuring only 10 μm in length and fabricated with a single-step lithography process, exhibits a peak simulated transmission efficiency of nearly 100% for in-plane mode conversion and a factor of 5 improvement over butt coupling for fiber to waveguide mode conversion in experimental testing.