| 摘要 |
This invention provides a four polarization maintaining optical fiber ferrule which cam keep the polarization maintaining planes of the optical fibers in place with respect to the reference planes of the ferrule, and also an optical coupler constructed using the four polarization maintaining optical. fiber ferrules so as to maintain. stable performance. Four polarization maintaining optical fibers 15, 16, 17, 18 are inserted into the end-face of the central throughhole 11 of the ferrule, and fastened there. A relation d = (2 1/2 + 1)d1 + .delta. is held for the diameter d of the central throughhole 11 at the end-face of the ferrule, and the diameter d1 of the optical fiber element, where .delta. is an allowance in the order of microns. The reference planes are provided on the outer surface of the ferrule so that the polarization maintaining plane of at least one of the polarization maintaining optical fiber elements is to be set at a certain angle with respect to the reference planes.
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