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To: Stephen L who wrote (1544)	5/4/2000 4:55:00 PM
From: Curtis E. Bemis	Read Replies (2) \| Respond to of 1782

The speed of light in materials is related to the index of refraction of that material. Although this is not simple and the index of refraction is wavelength dependant and all that, a typical index for fiber is in range 1.45-1.5. That makes the speed of light 65-70 % of the speed of light in vaccuo (index of refraction=1.0, 2.9979 x10^10 cm/sec). Pulse propagation in the soliton regime is non-linear and many dispersion effects influence it.