Driver circuit for an electro-absorption or micro-ring modulator and optical transmitter comprising such driver circuit
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United States of America Patent
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Jun 5, 2018
Issued Date -
Apr 28, 2016
app pub date -
Oct 15, 2015
filing date -
Oct 28, 2014
priority date (Note) -
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Abstract
A modulator driver circuit for providing a drive voltage to an electro-absorption modulator, such a Franz-Keldysh modulator, or to a micro-ring modulator, and an optical transmitter including such driver circuit, where said driver circuit includes a differential amplifier and at least one differential branch of the differential amplifier being provided with a voltage offset. This provides for a bias voltage being adjustable within the driver circuit itself. Preferably, the differential amplifier is arranged for supplying drive voltage to two complementary driver outputs providing a reverse bias relative to the modulator. In one embodiment, the differential amplifier includes a cascode in the differential branch not being provided with the voltage offset.
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