20-Channel micro-optic grating demultiplexer for 1.1–1.6 μm band using a small focusing parameter graded-index rod lens

Abstract

A 20-channel micro-optic grating demultiplexer with a single-mode input fibre has been developed for 1.1–1.6 μm band using a newly developed graded-index (Selfoc) rod lens with a small focusing parameter and an Si-etched reflection grating. Insertion losses were 1.9 to 3.5 dB. Isolation between adjacent channels was less than −20 dB.