Diffractive optical elements: fabrication and measurement of a wavelength division demultiplexer

A new type of wavelength division demultiplexer (DEMUX), which consists of a pair of diffractive optical elements integrated on one substrate, is presented. The 3 dB-resolution of the DEMUX is about 2 nm and the measured losses are about -3.5 db at 1.55-micrometers wavelength. To simplify the fabrication process of the integrated diffractive optical elements, a new 3D structure replication technique is proposed.