Laser diode driving circuit

Amplifiers – Parametric amplifiers – Semiconductor type

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372 31, 372 38, H04B 900

Patent

active

048068730

ABSTRACT:
A laser diode circuit has a photodiode which monitors the light output which is outputted by the laser diode and generates a photovoltaic current that corresponds to the level of the light output, a reference current selection device which selects a required reference current by switching among a plurality of reference current sources that are set to values of mutually different current values, and an amplifying apparatus which, by receiving a signal that corresponds to the photovoltaic current, controls the forward current of the laser diode so as to bring the photovoltaic current to a selected reference current. Instead of the above construction, there may be employed a construction which has a voltage transforming selector which generates a photovoltaic current signal voltage that corresponds to the photovoltaic current, a reference voltage selection device which selects a required reference voltage by switching among a plurality of reference voltage sources that are set to values of mutually different reference voltages, and an amplifying apparatus which, by receiving the photovoltaic current signal voltage and a selected reference voltage, controls the forward current of the laser diode so as to bring the photovoltaic current signal voltage equal to the selected reference voltage.

REFERENCES:
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Bobrow, Leonard S., "Elementary Circuit Analysis", 1981, CBS College Publishing, p. 163.

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