Disclosed is a high frequency optical pulse source generating stable optical
pulses over a wide current range in an optical transmission system to enhance stability
and reliability, the high frequency optical pulse source implementing, in one chip,
a multi-section distributed feedback (DFB) laser diode with a phase control section
arranged between two DFB laser diodes. By controlling the current applied to the
electrode of the phase control section while applying currents to the first and
second DFB sections, the present invention causes self-mode locking between the
compound-cavity modes having similar threshold currents, thereby generating stable
tens GHz-level optical pulses. Hence, the present invention generates optical pulses
uniformly over a wide current range, thereby enhancing the stability and reliability
of the element.
