Polymer compositions for broadband thermooptically controlled safety shutters, switches, neutral density filters, and attenuators

Compositions are described with low ON-state insertion loss (<0.1 dB/cm). Their sharp thermooptic transition (>5 dB/cm//spl deg/C) enables design of compact, high extinction ratio (>20 dB/cm) shutters, switches, variable neutral density filters, and variable optical attenuators.