Abstract

A monolithically integrated asymmetric graded index (GRIN) or step-index (GRIN) mode converters for microphotonic waveguides are proposed and described. The design parameters and tolerances are calculated for amorphous silicon (a-Si) couplers integrated with silicon-on-insulator waveguides. The GRIN and step-index couplers operate over a wide wavelength range with low polarization dependence, and the lithographic resolution needed is only ±1 µm. Finally, experimental results are presented for a single layer 3 µm thick step-index a-Si coupler integrated on a 0.8 µm thick SOI waveguide. The measured variation of coupling efficiency with coupler length is in agreement with theory, with an optimal coupling length of 15 µm for this device.

© 2006 Optical Society of America

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2nd International Conference on Group IV

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, Yasaitis, L.C. Kimmerling, and J. Michel, "Compact 3dB single mode fibre-to-waveguide coupler," in Proceedings of the 2nd International Conference on Group IV Photonics, 195-197 (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 2005).

CLEO/Pacific RIM 2003

K. Shiraishi, C.S. Tsai, H. Yoda, and K. Minagawa, "A micro-GRIN slab tip for integrating coupling between superfine-core waveguides and single mode fibers," in Proceedings of CLEO/Pacific RIM 2003, CD-ROM (Institute of Electrical and Electronics Engineers, Piscataway, NJ, 2003).

Electron. Lett.

T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 µm square Si wire waveguides to singlemode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

Guided-wave Optoelectronics

H. Kogelnik, "Theory of Optical Waveguides," in Guided-wave Optoelectronics, T. Tamir, ed., 7-87 (Springer Verlag, Berlin 1990)

IEEE Photon. Technol. Lett.

R.U. Ahmad, F. Pizzuto, G.S. Camarda, R.L. Espinola, H. Rao, and R.M. Osgood, "Ultracompact corner-mirrors and T-branches in silicon-on-insulator," IEEE Photon. Technol. Lett. 14, 65-67 (2002).
[CrossRef]

IEEE Photonics Technol. Lett.

G.Z. Masanovic, V.M.N. Passaro, and G.T. Reed, "Dual grating-assisted directional coupling between fibers and thin semiconductor waveguides," IEEE Photonics Technol. Lett. 15, 1395-1397 (2003).
[CrossRef]

J. Lightwave Technol.

L.B. Soldano and E.C.M. Pennings, "Optical multi-mode interference devices based on self-imaging: principles and applications," J. Lightwave Technol. 13, 615-627 (1995).
[CrossRef]

Opt. Lett.

Optics Express

A. Sure, T. Dillon, J. Murakowski, C. Lin, D. Pustai, and D. Prather, "Fabrication and characterization of three-dimensional silicon tapers," Optics Express 11, 3555-3561 (2003).

Photonics North 2004: Optical Components

A. Delâge, S. Janz, D.-X. Xu, D. Dalacu, B. Lamontagne, and A. Bogdanov, in Photonics North 2004: Optical Components and Devices, J.C. Armitage, S. Fafard, R.A. Lessard, and G.A Lamprpoulos, eds. "Graded-index coupler for microphotonic waveguides," Proc. SPIE Vol. 5577, 204-212 (2004).

Other

C. Manolatou and H.A. Haus, Passive components for Dense Optical Integration (Kluwer Academic Publishers, Boston, 2002), Chapter 6.

K. Iizuka, Engineering Optics, 2nd Edition (Springer-Verlag, Berlin 1987), Chapter 5.

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