Laser driver with integrated bond options for selectable currents
OwnerJesse Chin, An-Chun Tieninventors
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Abstract
A programmable laser driver may be programmed to meet the characteristics of a particular laser. Traditionally, external resistors are used to bias the driver and program the value of the drive current to suit a particular laser. Embodiments of the present invention comprise integrating a plurality of resistors with the IC driver and providing a bonding bad for each resistor. Thus, different drive currents may be selectable based on different bonding patterns corresponding to different bias resistance selections. These bond options allow the selection of different ranges of bias current, modulation current and temperature coefficients necessary to drive various lasers.
Claims20
An integrated circuit, comprising:
- a current source to drive a laser;
- a plurality of resistors to bias the current source;
- a plurality of pads associated with each of the plurality of resistors, wherein selecting one or more of the pads for bonding selects a desired bias resistance value.
A method, comprising:
- integrating a current source in an integrated circuit (IC);
- integrating a plurality of bias resistors in the IC to program the current source;
- providing a plurality of bond pads, one for each of the bias resistors;
- connecting a laser to the current source;
- and
- bonding one or more of the bond pads selected according to drive characteristics of the laser.
A system, comprising:
- a parallel optics module including a plurality of programmable laser drivers, each driving a particular laser, each of the laser drivers comprising:
- a current source to drive the particular laser;
- a plurality of resistors to bias the current source;
- a plurality of pads associated with each of the plurality of resistors,
- wherein selecting one or more of the pads for bonding selects a desired bias resistance value selected according to characteristics of the particular laser;
- input and output ports for transporting data signals through the parallel optics module;
- a processor for controlling the parallel optics module;
- and
- a memory connected to the processor.
Dependencies are inferred from the claim text.