Micron-size bending radii in silica-based waveguides

Wada, Kazumi; Popović, Miloš A.; Akiyama, S.; Haus, H.A.; Michel, Jürgen

doi:10.1109/leosst.2001.941951

Cited by 2 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We propose a scheme using air trenches to provide locally enhanced lateral mode confinement. We use adiabatic tapering to avoid abrupt junction-induced mode mismatch and Fresnel reflection in order to miniaturize optical waveguide bends while preserving low-loss performance [13].…”

Section: Introductionmentioning

confidence: 99%

Air trenches for sharp silica waveguide bends

Popović

Wada

Akiyama

et al. 2002

J. Lightwave Technol.

Self Cite

View full text Add to dashboard Cite

Air trench structures for reduced-size bends in lowindex contrast waveguides are proposed. To minimize junction loss, the structures are designed to provide adiabatic mode shaping between low-and high-index contrast regions, which is achieved by the introduction of "cladding tapers." Drastic reduction in effective bend radius is predicted. We present two-dimensional (2-D) finite-difference time-domain/effective index method simulations of bends in representative silica index contrasts. We also argue that substrate loss, while present, can be controlled with such air trenches and reduced to arbitrarily low levels limited only by fabrication capabilities. The required trench depth, given an acceptable substrate loss, is calculated in three dimensions using an approximate equivalent current sheet method and also by a numerical solver for full-vector leaky modes. A simple, compact waveguide T-splitter using air trench bends is presented. Index Terms-Air trench bend (ATB), cladding taper, enhanced lateral mode confinement, low-index contrast, sharp bend loss, silica waveguide.

show abstract

Section: Introductionmentioning

confidence: 99%

Air trenches for sharp silica waveguide bends

Popović

Wada

Akiyama

et al. 2002

J. Lightwave Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…We use adiabatic tapering to avoid mode mismatch and Fresnel reflection losses at abrupt junctions in order to miniaturize waveguide bends while maintaining broadband low-loss performance. 2 Air trenches have been proposed for suppressing bend radiation in several ways. 3,4 When they replace the cladding to enhance lateral mode confinement, mode mismatch-induced junction loss is incurred at points of abrupt change in refractive index and limits the success of the approach in low index contrast.…”

Section: Introductionmentioning

confidence: 99%