Patent ID: 7505694

Claim:
A fiber optic communication system for receiving an electronic digital data signal and transmitting the same, comprising: an optical signal source adapted to receive the electronic digital data signal and to produce a frequency modulated optical signal from a directly modulated semiconductor laser; an optical spectrum reshaper adapted to convert the frequency modulated optical signal into an amplitude modulated optical signal; a compensation apparatus for compensating for the adverse effects of the thermal chirp normally induced in the frequency modulated optical signal by modulating the semiconductor laser with the electronic digital data signal; wherein the compensation apparatus is adapted to modify the electronic digital data signal so as to modulate the optical source with both the original electronic digital data signal and a low pass filtered version of the original electronic digital data signal; and wherein the electronic digital data signal is applied to the semiconductor laser using two ports, an RF port and a low-frequency port, and further wherein the electronic digital data signal is applied to the RF port and the low-pass filtered version of the electronic digital data signal is applied to the low-frequency-port.