Using a new femtosecond laser writing technique, researchers inscribed waveguides within latched bismuth-doped iron garnet, enabling a Faraday rotator waveguide exhibiting <0.15 dB insertion loss and a figure of merit of 346° dB−1. This enabled a miniaturized optical isolator waveguide with >25 dB isolation ratio and <1.5 dB insertion loss over the entire optical telecom C-band, without lenses or an external magnet.
- Jerome Lapointe
- Cedrik Coia
- Réal Vallée
