ILD LASER GENERATOR GENERATOR
ILD LASER GENERATOR DRIVERS

The shunt current includes the first signal and the second signal.

The second signal has second amplitude smaller than the first amplitude and a second rising transition having a delay from the first rising transition. The first rising transition switches the laser diode from an on state to an off state of the laser diode. The first signal has first amplitude and a first rising transition.

ILD LASER GENERATOR GENERATOR

SUMMARY OF THE INVENTIONĪn aspect of the present application relates to a laser driver that comprises a first generator to generate a first signal in response to an input signal, a second signal generator to generate a second signal in response to the input signal, and an output terminal configured to output a shunt current to drive a laser diode. Patent Literature 1: Japanese Patent Application Laid-Open No. For example, a laser driver which introduced a push-pull driving technique to provide a modulation current to a light emitting element is described in Japanese Patent Application Laid-Open No.

ILD LASER GENERATOR DRIVERS

Some laser drivers have been developed for the direct to modulation system. The present invention relates to a laser driver, in particular, a laser driver for driving a laser diode in a direct modulation system. The laser driver of claim 1, wherein the laser diode is configured to externally receive a bias current and be driven by a driving current generated by subtracting the shunt current from the bias current. The laser driver of claim 4, wherein the bias circuit includes a current source.Ħ. The laser driver of claim 3, wherein the second generator further includes a bias circuit configured to provide a bias voltage to the control terminal of the second transistor.ĥ.

The laser driver of claim 2, wherein the first generator includes a first transistor configured to receive the input signal at a control terminal thereof and output the first signal from a current terminal thereof, and wherein the second generator includes a second transistor and a low pass filter, the second transistor being configured to receive the input signal at a control terminal thereof through the low pass filter and output the second signal from a current terminal thereof, the low pass filter being configured to reduce high frequency components from the input signal.Ĥ. The laser driver of claim 1, wherein the first signal has a first rise time, and wherein the second signal has a second rise time longer than the first rise time.ģ. A laser driver to provide a shunt current to a laser diode, comprising: a first generator to generate a first signal in response to an input signal, the first signal having first amplitude and a first rising transition that switches the laser diode from an ON state to an OFF state a second signal generator to generate a second signal in response to the input signal, the second signal having second amplitude smaller than the first amplitude and a second rising transition having a delay from the first rising transition and an output terminal configured to output the shunt current to an anode of the laser diode, the shunt current including the first signal and the second signal.Ģ.

Ild laser generator