| 摘要 |
In order to avoid a frequent multiple crossing in an optical fiber in a sheet and attach the optical connector near a marginal end of the sheet while maintaining a sufficient extra length and more extra length for attaching the optical fibers, in the optical fiber sheet 6 , an optical fiber 5 as an extra length section in the optical fiber path is disposed on three-layer wiring planes which are formed by attaching four sheets 1, 2, 3 , and 4 . Notched sections 2 a and 3 a are formed in the intermediate layers 2 and 3 . The optical fiber 5 communicates from a first wiring layer to a second wiring layer via the notched section 2 a so as to communicate from the second wiring layer to a third wiring layer via the notched section 3 a.
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