| 摘要 |
The laser diode circuit has a photodiode which monitors the light output from the laser diode and generates a photovoltaic current that corresponds to the level of the light output. A reference current selection device selects a reguired reference current by switching among a number of current sources that are set to mutually different current values. An amplifying apparatus, by receiving a signal that corresp. to the photovoltaic current, controls the forward current of the laser diode so as to bring the photovoltaic current to a selected reference current.
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