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Compact All-optical Buffers on a Silicon Chip

Xia Fengnian, Lidija Sekaric, Yurii A. Vlasov

Jan 1, 20071 citation

Toward photonic crystal optical buffer

Baba

Conference on Lasers and Electro-OpticsJan 1, 20080 citations

All-optical tunable buffering with coupled ultra-high Q whispering gallery mode microcavities

Wataru Yoshiki, Yoshihiro Honda, Tomohiro Tetsumoto +3 more

Abstract All-optical tunable buffering was recently achieved on a chip by using dynamically tuned coupled mode induced transparency, which is an optical analogue of electromagnetically induced transparency. However, the small Q s of about 105 used in those systems were limiting the maximum buffering time to a few hundred ps. Although employing an ultra-high Q whispering gallery mode (WGM) microcavity can significantly improve the maximum buffering time, the dynamic tuning of the WGM has remained challenging because thermo-optic and pressure tunings, which are widely used for WGM microcavities, have a very slow response. Here we demonstrate all-optical tunable buffering utilizing coupled ultra-high Q WGM cavities and the Kerr effect. The Kerr effect can change the refractive index instantaneously, and this allowed us to tune the WGM cavity very quickly. In addition, from among the various WGM cavities we employed a silica toroid microcavity for our experiments because it has an ultra-high Q factor (>2 × 107) and a small mode volume, and can be fabricated on a chip. Use of the Kerr effect and the silica toroid microcavity enabled us to observe an on-chip all-optical tunable buffering operation and achieve a maximum buffering time of 20 ns.Abstract All-optical tunable buffering was recently achieved on a chip by using dynamically tuned coupled mode induced transparency, which is an optical analogue of electromagnetically induced transparency. However, the small Q s of about 105 used in those systems were limiting the maximum buffering time to a few hundred ps. Although employing an ultra-high Q whispering gallery mode (WGM) microcavity can significantly improve the maximum buffering time, the dynamic tuning of the WGM has remained challenging because thermo-optic and pressure tunings, which are widely used for WGM microcavities, have a very slow response. Here we demonstrate all-optical tunable buffering utilizing coupled ultra-high Q WGM cavities and the Kerr effect. The Kerr effect can change the refractive index instantaneously, and this allowed us to tune the WGM cavity very quickly. In addition, from among the various WGM cavities we employed a silica toroid microcavity for our experiments because it has an ultra-high Q factor (>2 × 107) and a small mode volume, and can be fabricated on a chip. Use of the Kerr effect and the silica toroid microcavity enabled us to observe an on-chip all-optical tunable buffering operation and achieve a maximum buffering time of 20 ns.

Scientific ReportsAug 31, 201729 citations

Ultra-Fast All-Optical Modulator Using Nano-Waveguide Embedded in High Pressure Buffer Gas

Mohamed F. Fouda, M. S. Shahriar

We propose implementation of an ultra-fast, low power all-optical modulator at telecommunication wavelength via interaction of evanescent light field around a silicon nitride nano waveguide with Rubidium vapor under high pressure buffer gas.

Frontiers in OpticsJan 1, 20150 citations

Transparency on an optical chip

Robert W. Boyd, Daniel J. Gauthier

NatureJun 1, 200679 citations

Nanosecond Tunable Optical Delay using Silicon Cavities

Ali W. Elshaari, Stefan F. Preble

We present a tunable delay element that is inherently insensitive to free-carrier loss and achieves up to nanosecond delays even when tuned slowly. This will enable electrically tunable buffers on a silicon chip.

Frontiers in OpticsJan 1, 20092 citations

Ultra-compact optical buffers on a silicon chip

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