| 摘要 |
PURPOSE:To obtain an optical demultiplexer having high reliability, by using one common prism for plural optical paths. CONSTITUTION:As for incident light containing wavelength components lambda1-lambda6, which is irradiated to a filter 2a through an optical fiber 5g, a condensing rod lens 4, a prism 7 and a glass plate 1, only the lambda1 component is led to a fiber 5a, other light is reflected and is irradiated to a filter 2b, only the lambda2 component is led to a fiber 5b, and thereafter, the light is demultiplexed to each wavelength light in the same way. The prism for fixing each condensing rod lens 4a-4f is constituted of each common one 3, 3' and 7 as to each rod lens, and the number of prisms is reduced. |
