A direct comparison of single-walled carbon nanotubes and quantum-wells based subpicosecond saturable absorbers for all optical signal regeneration at 1.55 u0001m

摘要

Subpicosecond optical transmission experiments are used to compare saturable absorber u0001SAu0002 basednon bundled single-walled carbon nanotubes u0001SWNTu0002 and iron-doped InGaAs/InP epitaxial multiplenquantum wells u0001MQWu0002 at 1.55 u0001m telecom wavelength. The SA key parameters u0001contrast ratio,nsaturation fluence, and recovery timeu0002 relevant for high speed all optical signal regeneration u0001AOSRu0002nare extracted from the normalized differential transmission u0001NDTu0002. Although both SA exhibit goodncontrast ratios, SWNT show a full signal recovery as well as a much faster response time thannMQW. This original work on SA shows that SWNT are excellent candidates for future low costnAOSR.