We propose a volume holographic mode demultiplexer incorporating a dual-wavelength method, which enables us to
easily and flexibly set up the receiving system in mode division multiplexing for a large number of mode multiplexing.
This demultiplexer can separate a lot of multiplexed modes with different wavelengths through angularly hologram
multiplexing by appropriate angular difference between the two holographic writing beams. Thereby, the proposed
method can be applicable to wavelength division multiplexing systems. In this study, we demonstrated the mode
separation using the proposed demultiplexer with dual-wavelength. The results showed that the separation ratios of three
LP modes reached around 90%.