A dual-channel wavelength multiplexer / demultiplexer based on the restricted-resonance self-imaging effect

The authors propose a high-performance 980 / 1550-nm wavelength multiplexer / demultiplexer based on the restricted-resonance self-imaging effect in a buried-type waveguide system. The device functions either as a multiplexer or a demultiplexer, depending upon the direction of light propagation. Using the modal propagation analysis (MPA), characteristics of the device are investigated. We carried out the design of the device and showed that the device performance can be optimized by appreciate selection of the coupler width. A demultiplexer with an insertion loss of 0.4 dB and contrast of 25.5 dB at wavelength 1550 nm and 32 dB at 980 nm is demonstrated.