BRANCHING AND COUPLING DEVICE WITH FILTER

摘要

PURPOSE:To manufacture the branching and coupling device of simple constitution with high productivity by providing single or plural common dielectric multi-layered film filters which are arranged crossing optical ports so that the angles of intersection of the optical ports of an optical port group are different. CONSTITUTION:The optical branching and coupling device has the optical port group consisting of at least one optical port 5 and plural optical ports 6 and 7 branching from or coupled with the the optical port 5 and single or plural common dielectric multi-layered filters 8 which are arranged crossing the optical port group so that the angles q1 and q2 of intersection with the respective optical ports 6 and 7 of the optical port group are mutually different. Therefore, plural wavelengths can be discriminated by the one common dielectric multi- layered film filter 8, so the structure of the branching and coupling device with the filter is simplified and the manufactured is facilitated. Further, light beams with the respective wavelengths can be transmitted through only the one filter, so the loss of the optical ports can be measured without being affected by disturbing light even at the time of large-scale branching.