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All-optical slow-light on a photonic chip

Yoshitomo Okawachi, Mark A. Foster, Jay E. Sharping, Alexander L. Gaeta, Qianfan Xu, and Michal Lipson

Open Access Open Access

Abstract

We demonstrate optically tunable delays in a silicon-on-insulator planar waveguide based on slow light induced by stimulated Raman scattering (SRS). Inside an 8-mm-long nanoscale waveguide, we produce a group-index change of 0.15 and generate controllable delays as large as 4 ps for signal pulses as short as 3 ps. The scheme can be implemented at bandwidths exceeding 100 GHz for wavelengths spanning the entire low-loss fiber-optics communications window and thus represents an important step in the development of chip-scale photonics devices that process light with light.

©2006 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Top: Measured Raman gain (solid circles) and inferred refractive index change as a function of wavelength, which is derived via the Kramers-Kronig relations from the Lorentzian best-fit curve of the experimental points. Bottom: Plot of the inferred group index as a function of wavelength derived from the index change in the top plot.

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Fig. 2.
Fig. 2. Left: Experimental setup for coupling into the SOI planar waveguide. Right: Schematic configuration for generating and measuring delay. The signal and pump pulses are overlapped in time going into the waveguide.

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Fig. 3.
Fig. 3. Total measured delay as a function of the measured Raman gain parameter (dashed line represents the best fit to the data). Continuous tuning of the delay is generated between 0 and 282 fs. We observe the theoretically predicted linear relationship between the delay and the gain parameter.

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Fig. 4.
Fig. 4. Amplitude of the Fourier transformed interferograms with no pump pulse and with a pump pulse for which the total delay is 4 ps.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

n g ( ω ) = n ( ω ) + ω dn d ω .
Δ T D = G Γ R ,
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