Driver for electro-absorption modulator
AssigneeSumitomo Electric Industries, Ltd.
InventorsTaizo TATSUMI, Keiji TANAKA
Life of this patent
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Abstract
A transmitter optical module implemented with an electro-absorption (EA) modulator is disclosed. The module includes an EA driver comprising a signal detector, an offset controller, and a driver circuit. The signal detector detects the existence of the modulation signal input thereto. The offset controller provides to the driver circuit the first offset to shift the cross point of the output of the driver circuit higher when the modulation signal exists; while, the second offset when the modulation signal disappear. The second offset lowers the output of the driver circuit to prevent the excess optical output of the transmitter optical module.
Claims12
An electro-absorption (EA) driver to drive an EA device, comprising:
- a signal detector configured to detect an existence of a modulation signal;
- a driver circuit configured to amplify the modulation signal and generate an output signal;
- and
- an offset controller to provide first and second offsets to the driver circuit depending on the existence of the modulation signal detected by the signal detector, the first offset setting the output of the driver circuit to compensate a non-linearity of the EA device, the second offset setting the output of the driver circuit to prevent an excess optical output of the EA device.
Dependencies are inferred from the claim text.