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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 164–172

Compact cantilever couplers for low-loss fiber coupling to silicon photonic integrated circuits

Michael Wood, Peng Sun, and Ronald M. Reano  »View Author Affiliations


Optics Express, Vol. 20, Issue 1, pp. 164-172 (2012)
http://dx.doi.org/10.1364/OE.20.000164


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Abstract

We demonstrate coupling from tapered optical fibers to 450 nm by 250 nm silicon strip waveguides using compact cantilever couplers. The couplers consist of silicon inverse width tapers embedded within silicon dioxide cantilevers. Finite difference time domain simulations are used to design the length of the silicon inverse width taper to as short as 6.5 μm for a cantilever width of 2 μm. Modeling of various strip waveguide taper profiles shows reduced coupling losses for a quadratic taper profile. Infrared measurements of fabricated devices demonstrate average coupling losses of 0.62 dB per connection for the quasi-TE mode and 0.50 dB per connection for the quasi-TM mode across the optical telecommunications C band. In the wavelength range from 1477 nm to 1580 nm, coupling losses for both polarizations are less than 1 dB per connection. The compact, broadband, and low-loss coupling scheme enables direct access to photonic integrated circuits on an entire chip surface without the need for dicing or cleaving the chip.

© 2011 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(200.4650) Optics in computing : Optical interconnects
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Integrated Optics

History
Original Manuscript: October 10, 2011
Revised Manuscript: November 28, 2011
Manuscript Accepted: December 8, 2011
Published: December 19, 2011

Citation
Michael Wood, Peng Sun, and Ronald M. Reano, "Compact cantilever couplers for low-loss fiber coupling to silicon photonic integrated circuits," Opt. Express 20, 164-172 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-1-164


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