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US 2026/0100555 A1Published application
Current load-controlled laser driver
AssigneeII-Vi Delaware, Inc.
InventorsTheron JONES, Richard DAVIS, Brian CAREY, Michael YEUNG
Life of this patent
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Abstract
Laser circuits are disclosed herein that include, in one example, a proxy laser drive cell and a proxy comparator circuit for deriving a laser driver bias control using one or more constant current supplies. Comparator circuits are disclosed that are adapted to generate an output based on a proxy voltage having first and second voltage components wherein one of the voltage components is developed based on one or more constant current supplies indicative of laser control current.
Claims21
A laser circuit comprising:
- at least one laser drive cell in a current path of a laser, the laser drive cell comprising a driver bias control transistor adapted to regulate a laser current through the laser drive cell;
- at least one proxy laser drive cell, the proxy laser drive cell comprising a proxy driver control transistor adapted to regulate a proxy drive current through the proxy laser drive cell;
- and
- a proxy comparator circuit comprising a first input, a second input, and an output, wherein the proxy comparator circuit is adapted to generate the output based on a difference between the first input and the second input, wherein the first input of the proxy comparator circuit is configured to receive a proxy voltage comprising a first voltage component about equal to a laser threshold voltage of the laser and a second voltage component proportional to a current-based voltage drop of the laser,
- wherein the output of the proxy comparator circuit is electrically interfaced with the proxy laser drive cell such that the output of the proxy comparator circuit varies a current through the proxy laser drive cell, and
- wherein a proxy gate control signal for the proxy laser drive cell is electrically interfaced to the driver bias control transistor.
3 more elements
Dependencies are inferred from the claim text.