  We report on an optical frequency comb with 14nm (~1.8 THz) spectral
bandwidth at -3 dB level that is generated using a passively mode-locked
quantum-well (QW) laser in photonic integrated circuits (PICs) fabricated
through an InP generic photonic integration technology platform. This 21.5-GHz
colliding-pulse mode-locked laser cavity is defined by on-chip reflectors
incorporating intracavity phase modulators followed by an extra-cavity SOA as
booster amplifier. A 1.8-THz-wide optical comb spectrum is presented with
ultrafast pulse that is 0.35-ps-wide. The radio frequency beat note has a 3-dB
linewidth of 450 kHz and 35-dB SNR.
