| 摘要 |
A light output device comprises a controller configured to generate a set signal that sets a reference voltage for determining a predetermined value of an output power of the light in a case of power adjustment wherein the output power is changed to a power different from in a case of power accuracy requirement, and a reference voltage generating section configured to generate the reference voltage according to the set signal. The controller in the case of power accuracy requirement puts a set-signal output port in a high-impedance state, while in the case of power adjustment generates the set signal using a predetermined voltage, the set signal alternating between a high level and a low level. The reference voltage generating section in the case of power accuracy requirement generates the reference voltage on a basis of a level shift voltage generated by level shifting the predetermined voltage.
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