Pam driver with distributed modulation current setpoint feedback
AssigneeMACOM Technology Solutions Holdings, Inc.
InventorsEric IOZSEF, Dario SOLTESZ
Life of this patent
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Abstract
A driver electronic circuit for a pulse amplitude modulation transmitter includes a plurality of transmission lanes. Each transmission lane is configured to independently generate a current output corresponding to data input into each transmission lanes. The driver electronic circuit also includes a summing node configured to sum the output currents from the plurality of transmission lanes. The driver electronic circuit further includes one feedback loop circuit coupled to the plurality of transmission lanes configured to control the currents of each said current outputs. The driver electronic circuit may be configured to drive a vertical-cavity surface-emitting laser for optical communication.
Claims20
A driver electronic circuit for a pulse amplitude modulation transmitter, said driver electronic circuit comprising:
- a plurality of transmission lanes, wherein each transmission lane is configured to independently generate a current output corresponding to data input into each transmission lanes;
- a summing node configured to sum the output currents from the plurality of transmission lanes;
- and
- one feedback loop circuit coupled to the plurality of transmission lanes configured to control the currents of each said current outputs.
A feedback loop circuit configured to control bias and modulation currents for more than one transmission lane of pulse amplitude modulation drivers.
A method of providing feedback control to a plurality of pulse amplitude modulation transmission lanes, where said plurality of transmission lanes are configured to drive a common vertical-cavity surface-emitting laser (VCSEL), the method comprising:
- accessing a measurement of a resistance of said VCSEL;
- setting bias and modulation currents of current drivers of said plurality of transmission lanes based on said resistance;
- and
- controlling said bias and modulation currents of said plurality of transmission lanes via one feedback control circuit coupled to said plurality of transmission lanes.
Dependencies are inferred from the claim text.