| 摘要 |
An optical attenuator includes a first reflection portion reflecting a light incoming from an optical input portion in a direction different from incoming axis, a second reflection portion reflecting the light from the first reflection portion, an optical output portion outputting the light that is reflected by the first reflection portion after being reflected by the second reflection portion, and an optical-intensity-attenuation filter that is arranged on an optical path between the first reflection portion and the second reflection portion, optical transmittance being shifted in stages according to a position thereof. The first reflection portion is capable of turning to shift an incoming position at the optical-intensity-attenuation filter.
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