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

Roger Franz Dangel; Bert J. Offrein; Folkert Horst; Roland Germann; Gian-Luca Bona; Kurt J. Weingarten; Gabriel J. Spuehler

doi:10.1117/12.472474

3 April 2003 Compact and robust 10- to 40-GHz optical time-domain multiplexer based on high-index-contrast silicon-oxynitride waveguide technology

Roger Franz Dangel, Bert J. Offrein, Folkert Horst, Roland Germann, Gian-Luca Bona, Kurt J. Weingarten, Gabriel J. Spuehler

Author Affiliations +

Proceedings Volume 4944, Integrated Optical Devices: Fabrication and Testing; (2003) https://doi.org/10.1117/12.472474
Event: Photonics Fabrication Europe, 2002, Bruges, Belgium

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.

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Roger Franz Dangel, Bert J. Offrein, Folkert Horst, Roland Germann, Gian-Luca Bona, Kurt J. Weingarten, and Gabriel J. Spuehler "Compact and robust 10- to 40-GHz optical time-domain multiplexer based on high-index-contrast silicon-oxynitride waveguide technology", Proc. SPIE 4944, Integrated Optical Devices: Fabrication and Testing, (3 April 2003); https://doi.org/10.1117/12.472474

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KEYWORDS

Multiplexers

Reflectometry

Waveguides

Directional couplers

Picosecond phenomena

Signal attenuation

Silicon

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