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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 27 — Sep. 20, 2008
  • pp: 5041–5050

Ultrafast low-threshold all-optical switch implemented by arrays of ring resonators coupled to a Mach–Zehnder interferometer arm: based on 2D photonic crystals

M. A. Mansouri-Birjandi, M. K. Moravvej-Farshi, and A. Rostami  »View Author Affiliations

Applied Optics, Vol. 47, Issue 27, pp. 5041-5050 (2008)

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Using an array of m × n nonlinear ring resonators ( m = 1 , 3, 5, and n = 1 , 2, 3) coupled to the upper arm of a Mach–Zehnder interferometer (MZI), we have proposed an all-optical switch structure. Using a 5 × 3 array, we have shown the possibility of designing an all-optical switching device with a threshold intensity as low as 15 mW / m 2 and switching window of 35 ps . While using m × 1 arrays, we have achieved switching windows smaller than 10 ps , at the expense of higher switching thresholds, ranging from 37 to 55 mW / m 2 . The whole structure is based on a square lattice photonic crystal of lattice constant a = 600 nm , formed by rods of radius r = 90 nm in an air background. The linear rods’ refractive index is taken to be the same as that of Si 0.75 Ge 0.25 ; i.e., n r = 3.6 , whereas the nonlinear rod’s refractive index and Kerr index parameter are taken to be n 0 = 1.4 and n 2 = 10 14 m 2 / W . The center wavelength at which the nonlinear rings are designed to make the resonance is taken to be λ 0 = 1550 nm in free space.

© 2008 Optical Society of America

OCIS Codes
(230.1150) Optical devices : All-optical devices
(230.4555) Optical devices : Coupled resonators
(230.5298) Optical devices : Photonic crystals

ToC Category:
Optical Devices

Original Manuscript: May 1, 2008
Revised Manuscript: August 21, 2008
Manuscript Accepted: August 22, 2008
Published: September 19, 2008

M. A. Mansouri-Birjandi, M. K. Moravvej-Farshi, and A. Rostami, "Ultrafast low-threshold all-optical switch implemented by arrays of ring resonators coupled to a Mach-Zehnder interferometer arm: based on 2D photonic crystals," Appl. Opt. 47, 5041-5050 (2008)

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