Accession Number : ADP007850

Title :   Pulsewidth-Dependent Self Phase Modulation in Semiconductor Traveling Wave Amplifiers,

Corporate Author : DAVID SARNOFF RESEARCH CENTER PRINCETON NJ

Personal Author(s) : Delfyett, P. J. ; Silberberg, Y. ; Alphonse, G.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : 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.

Descriptors :   *TRAVELING WAVE TUBES, *TRANSISTOR AMPLIFIERS, COOLING, DEPLETION, DYNAMICS, GAIN, PHASE MODULATION, PULSES, RECOVERY, SEMICONDUCTORS, TRAVELING WAVES.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE