| 摘要 |
An optical disk device has a semiconductor laser (21) that oscillates in a multiple mode, a first polarization-preserving fiber (33), and a second polarization-preserving fiber (36). The first and second polarization-preserving fibers (33, 36) form an optical path through which the laser beam emitted from the semiconductor laser (21) is transmitted so as to compensate for the variation of polarization caused while the laser beam travels through one of the polarization-preserving fibers by means of the other. As a result, the laser beam in multiple mode can travel through the optical fibers while maintaining the polarization of the laser beam.
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