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US 12,095,225 B2Granted
DML driver
AssigneeNippon Telegraph and Telephone Corporation
InventorsToshiki Kishi, Munehiko Nagatani, Hideyuki Nosaka
Life of this patent
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Abstract
The DML driver includes: a post driver which supplies a driving current to the LD; and a pre-driver which drives the post driver in response to a modulated signal. The pre-driver has a transistor, a peaking inductor, a peaking inductor, a group delay inhibition inductor, and a peaking capacitor.
Claims8
A DML driver comprising:
- a post driver configured to supply a driving current to a laser diode;
- and
- a pre-driver configured to drive the post driver in response to an inputted modulated signal, the pre-driver including:
- a first transistor, wherein the inputted modulated signal is configured to be input into a gate of the first transistor or a base of the first transistor;
- a first resistor, wherein a first end of the first resistor is connected to a first power supply voltage;
- a first inductor, wherein a first end of the first inductor is connected to a second end of the first resistor, wherein a second end of the first inductor is connected to a drain of the first transistor or a collector of the first transistor;
- a second inductor, wherein a first end of the second inductor is connected to the drain of the first transistor or the collector of the first transistor, wherein a second end of the second inductor is connected to an input terminal of the post driver;
- a third inductor, wherein a first end of the third inductor is connected to a source of the first transistor or an emitter of the first transistor, wherein a second end of the third inductor is connected to a second power supply voltage;
- and
- a capacitor, wherein a first end of the capacitor is connected to the source of the first transistor or the emitter of the first transistor, wherein a second end of the capacitor is connected to the second power supply voltage.
7 more elements
A method comprising:
- supplying, by a post driver of a DML driver, a driving current to a laser diode;
- and
- driving, by a pre-driver of the DML driver, the post driver in response to an inputted modulated signal, the pre-driver including:
- a first transistor, wherein the inputted modulated signal is input into a gate of the first transistor or a base of the first transistor;
- a first resistor, wherein a first end of the first resistor is connected to a first power supply voltage;
- a first inductor, wherein a first end of the first inductor is connected to a second end of the first resistor, wherein a second end of the first inductor is connected to a drain of the first transistor or a collector of the first transistor;
- a second inductor, wherein a first end of the second inductor is connected to the drain of the first transistor or the collector of the first transistor, wherein a second end of the second inductor is connected to an input terminal of the post driver;
- a third inductor, wherein a first end of the third inductor is connected to a source of the first transistor or an emitter of the first transistor, wherein a second end of the third inductor is connected to a second power supply voltage;
- and
- a capacitor, wherein a first end of the capacitor is connected to the source of the first transistor or the emitter of the first transistor, wherein a second end of the capacitor is connected to the second power supply voltage.
7 more elements
Dependencies are inferred from the claim text.