Patent ID: 6320688
Filing Date: 2001-11-20
Classification: B82Y,G02F,H01S,H04B

Abstract:
An optical transmitter comprising:(a) a primary input port for receiving an input signal, said input signal being a high frequency and analogue electrical signal,(b) a directly modulated semi-conductor laser having a modulation input connected to said primary input port, and(c) a non-linear optical intensity modulator optically connected in series with an optical output of said laser, said modulator having a modulator port connected to the primary input port, said modulator having a transfer characteristic arranged to cancel at least partially intermodulation distortion in the optical signal output of the laser,(d) wherein a controlled ratio is set between the amplitudes of the signal applied to the modulation input of the laser and a modulating signal applied to the modulator port of the modulator, and an output of the modulator includes modulation by both said laser and said modulator.