Download or read book Pulsewidth-Dependent Self Phase Modulation in Semiconductor Traveling Wave Amplifiers written by P. J. Delfyett and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we show a pulsewidth dependent self-phase modulation (SPM) of optical pulses in semiconductor traveling wave amplifiers due to nonlinear gain depletion and hot carrier thermalization, termed as the dynamic carrier cooling effect. The dynamic carrier cooling effect can be observed as a fast ( - 1 psec) partial recovery of the gain of a semiconductor traveling wave amplifier when a femtosecond optical pulse propagates through the device. While SPM due to gain depletion has been observed before, this is the first observed of SPM due to the dynamic carrier cooling effect.