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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 9 — May. 5, 2014
  • pp: 10487–10493

Efficient, compact and low loss thermo-optic phase shifter in silicon

Nicholas C. Harris, Yangjin Ma, Jacob Mower, Tom Baehr-Jones, Dirk Englund, Michael Hochberg, and Christophe Galland  »View Author Affiliations


Optics Express, Vol. 22, Issue 9, pp. 10487-10493 (2014)
http://dx.doi.org/10.1364/OE.22.010487


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Abstract

We design a resistive heater optimized for efficient and low-loss optical phase modulation in a silicon-on-insulator (SOI) waveguide and characterize the fabricated devices. Modulation is achieved by flowing current perpendicular to a new ridge waveguide geometry. The resistance profile is engineered using different dopant concentrations to obtain localized heat generation and maximize the overlap between the optical mode and the high temperature regions of the structure, while simultaneously minimizing optical loss due to free-carrier absorption. A 61.6 μm long phase shifter was fabricated in a CMOS process with oxide cladding and two metal layers. The device features a phase-shifting efficiency of 24.77 ± 0.43 mW/π and a −3 dB modulation bandwidth of 130.0 ± 5.59 kHz; the insertion loss measured for 21 devices across an 8-inch wafer was only 0.23 ± 0.13 dB. Considering the prospect of densely integrated photonic circuits, we also quantify the separation necessary to isolate thermo-optic devices in the standard 220 nm SOI platform.

© 2014 Optical Society of America

OCIS Codes
(250.5300) Optoelectronics : Photonic integrated circuits
(250.7360) Optoelectronics : Waveguide modulators

ToC Category:
Integrated Optics

History
Original Manuscript: March 12, 2014
Revised Manuscript: April 12, 2014
Manuscript Accepted: April 13, 2014
Published: April 23, 2014

Citation
Nicholas C. Harris, Yangjin Ma, Jacob Mower, Tom Baehr-Jones, Dirk Englund, Michael Hochberg, and Christophe Galland, "Efficient, compact and low loss thermo-optic phase shifter in silicon," Opt. Express 22, 10487-10493 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-9-10487


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