Abstract
Over the last few years the third-order nonlinear optical properties of chalcogenide glasses has received much attention with regard to their ability to be used in ultrafast all-optical switching for optical communication. Optical fibres made from these glasses are used in the optical switching devices as they provide large interaction lengths. A large off-resonant nonlinearity with low linear and non-linear absorption loss is required for a smaller length of switching device. All-optical switching has been demonstrated in AS2S3 glass fibres but these suffer from the drawback of large two-photon absorption. Hence the thermal contribution to the optical nonlinearity due to two-photon absorption can become a dominant mechanism in high bit-rate system applications and should be avoided. The two-photon absorption is also known to cause the optical damage in the AS2S3 fibres at 1.3 µm.
© 2000 IEEE
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