摘要 |
PURPOSE:To obtain a simple-structure and small-sized optical demultiplexer/ multiplexer whose number of parts is small, by providing a reference rod lens and an interference film filter on both sides of a parallel plane transmission plate. CONSTITUTION:When the light having wavelengths lambda1-lambda4 is made incident on a port I of a reference rod lens 151, the light having the wavelength lambda1 is demultiplexed and outputted from a port II of the reference rod lens 151, and the light having the wavelength lambda2 is demultiplexed and outputted from a port III of a rod lens 152, and the light having the wavelength lambda3 is demultiplexed and outputted from a port IV of a rod lens 153, and the light having the wavelength lambda4 is demultiplexed and outputted from a port V of a rod lens 154. When lights having wavelenfgths lambda1-lambda4 are made incident on ports II-V respectively, the multiplexed output having wavelengths lambda1-lambda4 is taken out from the port I. The number of rod lenses and interference film filters is increased or reduced to obtain the optical demultiplexer/multiplexer having an optional number of multiplexed or demultiplexed waves. |