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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 3582–3594

Low loss coupling to sub-micron thick rib and nanowire waveguides by vertical tapering

S. Madden, Z. Jin, D. Choi, S. Debbarma, D. Bulla, and B. Luther-Davies  »View Author Affiliations

Optics Express, Vol. 21, Issue 3, pp. 3582-3594 (2013)

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Highly nonlinear planar glass waveguides have been shown to be useful for all optical signal processing. However, the typical SMF-28 fiber to waveguide coupling loss of ~5dB/end remains a barrier to practical implementation. Low loss coupling to a fiber using vertical tapering of the waveguide film is analyzed for rib and nanowire waveguides and experimentally demonstrated for ribs showing polarization and wavelength independence over >300nm bandwidth. Tapers with essentially zero excess loss led to total losses from the waveguide to fiber core of 1.1dB per facet comprising only material absorption (0.75dB) and mode overlap loss (0.36dB), both of which can be eliminated with improvements to processing and materials.

© 2013 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(160.4670) Materials : Optical materials
(230.7370) Optical devices : Waveguides
(310.2785) Thin films : Guided wave applications

ToC Category:
Integrated Optics

Original Manuscript: November 19, 2012
Revised Manuscript: January 21, 2013
Manuscript Accepted: January 25, 2013
Published: February 5, 2013

S. Madden, Z. Jin, D. Choi, S. Debbarma, D. Bulla, and B. Luther-Davies, "Low loss coupling to sub-micron thick rib and nanowire waveguides by vertical tapering," Opt. Express 21, 3582-3594 (2013)

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