| 摘要 |
A light emitted from a light source (11) or a return light from a magneto-optical discs (7a, 7b, 7c or 7d) is transmitted by a polarization maintaining optical fibers (15a, 15b, 15c or 15d). Phase difference generators (16a, 16b, 16c and 16d) are disposed in optical paths, respectively, for these light beams to generate a phase difference which is used to cancel, or multiply by an integer multiple of pi, a phase difference between field vibration components, raised in the light due to the birefringence of the polarization maintaining optical fiber (15a, 15b, 15c or 15d) when the light is propagated through the latter.
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