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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 lowloss fiber-optics communications window and thus represents an important step indoi:10.1364/oe.14.002317 pmid:19503569 fatcat:ehvcv4kqerhebngv2xopzwreqi