Prechirp technique as a linear dispersion compensation for multi-gigabit long-span IM-DD optical transmission systems

A prechirp technique for linear dispersion compensation for intensity modulation direct detection (IM-DD) optical transmission systems has been investigated theoretically and experimentally. This technique is based on the predistortion technique in an optical transmitter. It is easily applied to the ordinary IM-DD optical transmitter which uses an external intensity modulator, because it requires only the addition of a small sinusoidal current modulation to a semiconductor laser diode. Allowable transmission fiber dispersion will be more than doubled with this technique. For example, allowable dispersion is expanded to over 11000 ps/nm dispersion at 2.5 Gb/s and 700 ps/nm at 10 Gb/s. The prechirp technique should be applicable to multi-gigabit transoceanic transmission systems in the future.<
>