This paper describes recent progress in relation to the key optical devices for high-speed digital coherent transmission, namely coherent receivers and advanced-format modulators. Miniaturization and higher performance have been achieved on a silica-based planar lightwave circuit (PLC) platform and it has been integrated with other key materials.
We review the athermalization techniques that have been proposed for AWGs and discuss the advantages and disadvantages provided by each approach. We then describe our recent progress on the design and fabrication of a silica-based athermal AWG with a 1.5%-▵ waveguide and report its compactness and excellent optical characteristics including its extremely low insertion loss.
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