| 摘要 |
A fused optical fiber coupler comprising a first pair of axially elongat ed cylindrical fibers, each having a circular transverse cross-section of a fir st diameter, the first pair of fibers being in fused contact with each other along a continuo us line and forming grooves on opposite sides of the line. A second pair of axially elongated cylindrical fibers each having a circular transverse cross-section of a seco nd diameter different than the first diameter of the first pair of fibers, one fiber fro m the second pair of fibers being disposed in each of the grooves and fused to each of the fir st pair of fibers.
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