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US 2014/0233594 A1Published application
Dc-coupled laser drive circuit and method for driving laser diode device
AssigneeFujikura Ltd.
InventorTatsuo KUBO
Life of this patent
Estimating the term…
Abstract
A DC-coupled laser drive circuit (1) includes (i) a voltage drop section (14) provided between a power source and a pre-driver (12) and (ii) a voltage drop amount controlling section (16) for controlling, according to an output of the pre-driver (12), an amount of a voltage drop in the voltage drop section (14).
Claims9
A DC-coupled laser drive circuit comprising:
- a pre-driver for adjusting an amplitude of a voltage signal modulated by a data signal;
- a main driver, connected to a laser diode device without a capacitor in between, which converts, into an electric current signal to be supplied to the laser diode device, a voltage signal whose amplitude has been adjusted by the pre-driver;
- a voltage drop section, provided between the pre-driver and a power source for supplying electric power to the pre-driver, in which an amount of a voltage drop is variable;
- and
- a voltage drop amount controlling section for controlling, in accordance with a voltage signal whose amplitude has been adjusted by the pre-driver, the amount of the voltage drop in the voltage drop section.
2 more elements
A method for driving a laser diode device, comprising the steps of:
- (i) adjusting, with the use of a pre-driver, an amplitude of a voltage signal modulated by a data signal;
- (ii) converting, by use of a main driver which is connected to a laser diode device without a capacitor in between, the voltage signal, whose amplitude has been adjusted in the step (i), into an electric current signal to be supplied to the laser diode;
- and
- (iii) controlling, in accordance with a voltage signal whose amplitude has been adjusted in the step (i), an amount of a voltage drop in a voltage drop section which is provided between the pre-driver and a power source for supplying electric power to the pre-driver.
1 more element
Dependencies are inferred from the claim text.