DRIVER CIRCUIT FOR AN ELECTRO-ABSORPTION OR MICRO-RING MODULATOR AND OPTICAL TRANSMITTER COMPRISING SUCH DRIVER CIRCUIT

摘要

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 comprising such driver circuit, where said driver circuit comprises a differential amplifier and at least one differential branch of the differential amplifier being provided with a voltage offset. This provide for a bias voltage being adjustable within the driver circuit itself. Preferably, said differential amplifier is arranged for supplying drive voltage to two complementary driver outputs providing a reverse bias relative to the modulator. In one embodiment, said differential amplifier comprises a cascode in the differential branch not being provided with the voltage offset.

主权项

1. A modulator driver circuit for providing a drive voltage to an electro-absorption or micro-ring modulator, said driver circuit comprising a differential amplifier and at least one differential branch of the differential amplifier being provided with a voltage offset, preferably said differential amplifier being arranged for supplying drive voltage to two complementary driver outputs providing a reverse bias relative to the modulator.