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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 18 — Sep. 15, 2013
  • pp: 3608–3611

Ultralow-loss silicon waveguide crossing using Bloch modes in index-engineered cascaded multimode-interference couplers

Yang Zhang, Amir Hosseini, Xiaochuan Xu, David Kwong, and Ray T. Chen  »View Author Affiliations

Optics Letters, Vol. 38, Issue 18, pp. 3608-3611 (2013)

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We investigate the loss mechanism in three-moded multimode-interference couplers that are the building blocks of a compact and low-loss waveguide crossing structure. Broadband silicon waveguide crossing arrays with < 0.01 dB insertion loss per crossing are proposed using cascaded multimode-interference couplers, where lateral subwavelength nanostructures are used to reduce the insertions loss. We design and fabricate a 101 × 101 waveguide crossing array with a pitch of 3.08 μm. Insertion loss of 0.02 dB per crossing and crosstalk < 40 dB at 1550 nm operating wavelength and a broad transmission spectrum ranging from 1520 to 1610 nm are experimentally demonstrated.

© 2013 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: July 17, 2013
Manuscript Accepted: August 12, 2013
Published: September 10, 2013

Yang Zhang, Amir Hosseini, Xiaochuan Xu, David Kwong, and Ray T. Chen, "Ultralow-loss silicon waveguide crossing using Bloch modes in index-engineered cascaded multimode-interference couplers," Opt. Lett. 38, 3608-3611 (2013)

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