| 摘要 |
PURPOSE:To provide a new circuit pattern for a multiple branch optical circuit of a tree structure capable of making the element length shorter than that of conventional element without increasing loss. CONSTITUTION:An extension CL of central axis of the first stage incident path 22 is assumed as a reference line. Of the branched portions in the second and later stages, each of branched portions 2, 3, 4 and 7 located in the outermost position is branched outward in a pattern in which the angles theta2 and theta3 formed between each branch center line and the reference line progressively increase toward the later stages. |
