Abstract
Recently there has been considerable interest in ultrafast gain and refractive index nonlinearities in InGaAsP semiconductor amplifiers at wavelengths around 1.5 μm.1–3 In particular, when an amplifier is biased at transparency such that a pulse propagating through it experiences no net gain or absorption, a large nonlinearity of |n2| ≈ 2 × 10−11 cm 2W−1 having a recovery time of a few picoseconds has been measured.2 Several all-optical switching devices have been demonstrated using this nonlinearity.4,5
© 1996 Optical Society of America
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