An integrated optical add/drop multiplexer in InP based on elliptic couplers and Bragg grating reflector

The wavelength add/drop multiplexer (ADM) is one of the key components for dense wavelength division multiplexing (DWDM) systems. To realise this function, a number of schemes have been proposed and tested based on planar waveguide circuits or optical fibers, such as the planar waveguide based grating-folded directional coupler ADM, fiber based ADM's using Mach-Zehnder interferometer structure and photoimprinted Bragg gratings and so on. We proposed a new add/drop scheme based on elliptic beam collimators and Bragg gratings realised in InP. In this paper, we will report the device design, fabrication and the preliminary experimental results.