| 摘要 |
An optical directional coupling apparatus includes an optical directional coupling device for permitting light of a predetermined polarization direction to be emitted from a second port when it is received at a first port of the coupling device, and for permitting only a light component of a polarization direction at a given angle with respect to the first polarization direction to be emitted from a third port when light is received at the second port. A polarization maintaining single mode fiber, is coupled at one end to the second port and has a main axis set at a predetermined angle with respect to the first polarization direction, wherein an optical fiber to be measured is connected at one end to the other end of said polarization maintaining single mode fiber.
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