Laser driver peaking system and method for optical communication systems

摘要

In an optical data communication system transmitter, in which a laser is driven with a laser modulation signal in response to a serial data stream, the laser driver adds peaking to a bit other than the first bit following a bit transition.

主权项

1. A method for driving a laser in an optical data communication system transmitter in response to a serial data stream, the method comprising:
producing a laser modulation signal in response to the serial data stream, the laser modulation signal having a first signal level in response to a “0” bit in the serial data stream and a second signal level in response to a “1” bit in the serial data stream; producing a peaking signal in response to a bit transition in the serial data stream; delaying the peaking signal by a delay time corresponding to at least one bit in the serial data stream after the bit transition to produce a delayed peaking signal, the delayed peaking signal having a positive polarity in response to the bit transition being from a “0” to a “1” and a negative polarity in response to the bit transition being from a “1” to a “0”; increasing an amplitude of the laser modulation signal by an amount corresponding to the delayed peaking signal having the positive polarity when the serial data stream represents a “1” bit and not increasing the amplitude of the laser modulation signal by the amount corresponding to the delayed peaking signal having the positive polarity when the serial data stream represents a “0” bit; increasing an amplitude of the laser modulation signal by an amount corresponding to the delayed peaking signal having the negative polarity when the serial data stream represents a “0” bit and not increasing the amplitude of the laser modulation signal by the amount corresponding to the delayed peaking signal having the negative polarity when the serial data stream represents a “1” bit; and providing the laser modulation signal to a data signal input of the laser.