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Proceedings Paper

Compact and robust 10- to 40-GHz optical time-domain multiplexer based on high-index-contrast silicon-oxynitride waveguide technology
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Paper Abstract

Fast pulse-generating laser sources at 10 GHz are commercially available. For future communications system applications of these light sources at 40 GHz, we developed a passive, fully integrated optical 10 to 40 GHz time-domain multiplexer. This device is very compact (16×5 mm2) and robust, whereby its miniaturization and robustness are based on the high-index-contrast silicon-oxynitride (SiON) waveguide technology used. This 4X multiplexer consists of two cascaded asymmetric Mach-Zehnder structures. Thereby a total of three directional couplers and two delay lines of 50 ps and 25 ps, respectively, are cascaded. Because of the high SiO2-SiON index contrast of 3.8 % it was possible to realize a multiplexer device with bending radii of less than 1.0 mm in an ultra-compact double-folded design. The slightly unbalanced attenuation in the delay lines was pre-compensated by the directional coupler design, i.e. by detuning from 50 % : 50 % coupling ratio. We demonstrated experimentally that with a fundamentally mode-locked 10 GHz Er:Yb:glass laser source at the design wavelength of 1535 nm our 4X multiplexer produces a 40 GHz pulse train with < 0.22 dB pulse-to-pulse power variation and < 350 fs timing jitter. Although the current device is designed for 40 GHz, its principle can be applied to 160 GHz or higher, provided that suitable pulse sources are available.

Paper Details

Date Published: 3 April 2003
PDF: 9 pages
Proc. SPIE 4944, Integrated Optical Devices: Fabrication and Testing, (3 April 2003); doi: 10.1117/12.472474
Show Author Affiliations
Roger Franz Dangel, IBM Zurich Research Lab. (Switzerland)
Bert J. Offrein, IBM Zurich Research Lab. (Switzerland)
Folkert Horst, IBM Zurich Research Lab. (Switzerland)
Roland Germann, IBM Zurich Research Lab. (Switzerland)
Gian-Luca Bona, IBM Zurich Research Lab. (Switzerland)
Kurt J. Weingarten, GigaTera Inc. (Switzerland)
Gabriel J. Spuehler, GigaTera Inc. (Switzerland)

Published in SPIE Proceedings Vol. 4944:
Integrated Optical Devices: Fabrication and Testing
Giancarlo C. Righini, Editor(s)

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