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Ultra-low-loss optical delay line on a silicon chip

Lee, Hansuek and Chen, Tong and Li, Jiang and Painter, Oskar and Vahala, Kerry J. (2012) Ultra-low-loss optical delay line on a silicon chip. Nature Communications, 3 . Art. No. 867. ISSN 2041-1723. doi:10.1038/ncomms1876.

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Light propagation through an optical fibre causes a long, non-resonant (true) time delay used in numerous applications. In contrast to how it is deployed in optical communication systems, fibre is coiled in these applications to reduce footprint. This is a configuration better suited for a chip-based waveguide that would improve shock resistance, and afford the possibility of integration for system-on-a-chip functionality. However, integrated waveguide attenuation rates lag far behind the corresponding rates of optical fibre, featuring attenuation many orders larger. Here we demonstrate a monolithic waveguide as long as 27 m (39 m optical path length), and featuring broadband loss rate values of (0.08±0.01) dB m^(−1) measured over 7 m by optical backscatter. Resonator measurements show a further reduction of loss to 0.037 dB m^(−1), close to that of optical fibres when first considered a viable technology. Scaling this waveguide to integrated spans exceeding 250 m and attenuation rates below 0.01 dB m^(−1) is discussed.

Item Type:Article
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Lee, Hansuek0000-0002-0748-7662
Painter, Oskar0000-0002-1581-9209
Vahala, Kerry J.0000-0003-1783-1380
Additional Information:© 2012 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivative Works 3.0 Unported License. To view a copy of this license, visit Received 15 December 2011; Accepted 30 April 2012; Published 29 May 2012. We gratefully acknowledge the Defense Advanced Research Projects Agency under the iPhOD program and the Kavli Nanoscience Institute at Caltech. H.L. thanks the Center for the Physics of Information and the help from Kiyoul Yang and Seokmin Jeon. Author contributions: All authors made important contributions to the work. H.L. performed microfabrication of devices with assistance from T.C. T.C. and H.L. performed measurements with assistance from J.L. T.C. performed modelling with assistance from H.L. and K.J.V. H.L., T.C., O.P. and K.J.V. conceived, designed and planned the experiments. All authors helped to write the paper. The authors declare no competing financial interests.
Group:Kavli Nanoscience Institute
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Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Center for the Physics of Information, CaltechUNSPECIFIED
Record Number:CaltechAUTHORS:20120625-102405306
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Official Citation:Lee, H. et al. Ultra-low-loss optical delay line on a silicon chip. Nat. Commun. 3:867 doi: 10.1038/ncomms1876 (2012).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32058
Deposited By: Tony Diaz
Deposited On:27 Jun 2012 19:00
Last Modified:09 Nov 2021 20:03

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