"Vanishing-core" tapered coupler for interconnect applications

Dan Neugroschl; Victor I. Kopp; Jonathan Singer; Guoyin Zhang

doi:10.1117/12.808632

12 February 2009 "Vanishing-core" tapered coupler for interconnect applications

Dan Neugroschl, Victor I. Kopp, Jonathan Singer, Guoyin Zhang

Proceedings Volume 7221, Photonics Packaging, Integration, and Interconnects IX; 72210G (2009) https://doi.org/10.1117/12.808632
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

The "vanishing-core" tapered coupler is an all-fiber device that efficiently couples light between a standard low-numerical- aperture (NA) waveguide, such as a standard silica fiber, and a high-NA waveguide or device with a dissimilar mode field profile, such as a planar waveguide or laser diode. The coupler is comprised of a central core surrounded by a concentric secondary core for low-NA coupling on one side of the device. The central core effectively disappears on the tapered end of the device. Light escaping the "vanishing-core" at the tapered end of the fiber is confined in the secondary core by the surrounding cladding for high-NA coupling. This lens-less, low-insertion-loss solution obviates the need for a significant air gap between coupled components required in lensed fibers and thereby enables the use of index matching compounds. The all-fiber design also facilitates polarization selective and polarizing coupling and provides a path towards a high density of passively aligned interconnects.

Citation Download Citation

Dan Neugroschl, Victor I. Kopp, Jonathan Singer, and Guoyin Zhang ""Vanishing-core" tapered coupler for interconnect applications", Proc. SPIE 7221, Photonics Packaging, Integration, and Interconnects IX, 72210G (12 February 2009); https://doi.org/10.1117/12.808632

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