Controlling the extinction ratio of optical transmitters
AssigneeMaxim Integrated Products, Inc.
InventorsChristopher G. Martinez, Qingsheng Tan
Life of this patent
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Abstract
A system and method for stabilizing an extinction ratio for an optical transmitter that uses a laser diode that is modulated by a laser driver, the scheme having a modulating current and a bias current, wherein a portion of the bias current is fed forward into the modulating current to stabilize the extinction ratio and thereby improve a laser's performance over time and with increases in temperature.
Claims17
A laser driver generating an Imod current and an Ibias current, said laser driver characterized in that a portion of said Ibias current is fed forward to said Imod current.
A laser system comprising:
- a laser;
- a laser driver generating an Imod current and an Ibias current for controlling said laser, said laser driver characterized in that a portion of said Ibias current is fed forward to said Imod current;
- and
- wherein said Ibias current feed forward decreases an extinction ratio said laser driver.
A method of controlling an extinction ratio of a laser driver comprising an Imod current and an Ibias current, said method comprising an act of feeding forward a portion of said Ibias current to said Imod current.
A system for stabilizing an extinction ratio of an optical transmitter comprising:
- a laser diode driver;
- a photo monitor;
- an I-mod current that controls an on and off state of said laser diode driver;
- an I-bias current that provides a base line power level to said laser diver, creating an extinction ratio;
- and
- wherein a portion of said I-bias current is fed forward into said I-mod current,
- whereby said extinction ratio is stabilized.
Dependencies are inferred from the claim text.