Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12629
Title: Low-loss waveguide crossing using a multimode interference structure
Authors: Liu, H
Tam, H 
Wai, PKA 
Pun, E
Keywords: BPM simulations
Integrated-optical
Low-loss slab propagation
MMI
Multimode interference
Optical waveguides
Self-imaged properties
Waveguides
Issue Date: 2004
Publisher: North-Holland
Source: Optics communications, 2004, v. 241, no. 1-3, p. 99-104 How to cite?
Journal: Optics communications 
Abstract: A novel design technique for low-loss waveguide crossing using the self-imaging properties of multimode interference (MMI) structures is presented. The technique exploits the observation that optical fields with a small lie width relative to that of the MMI structure in the image reformed region experience negligible propagation loss even in the absence of lateral guiding mechanism around the region. This allows the introduction of a slab in the MMI region. The technique could also be used to design planar light-wave circuits with small wavelength-dependent loss which is important for DWDM devices. Using two-dimensional wide-angle BPM simulations, taper width technology and MMI structure technology is compared for low-loss slab propagation in orthogonal intersection. We also demonstrate that low-loss crossing waveguides with intersection angle as small as 23° can be achieved with the aid of MMI structures.
URI: http://hdl.handle.net/10397/12629
ISSN: 0030-4018
EISSN: 1873-0310
DOI: 10.1016/j.optcom.2004.07.008
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