Abstract-1.8-THz-wide optical frequency comb emitted from monolithic passively mode-locked semiconductor quantum-well laser

Mu-Chieh Lo, Robinson Guzmán, Muhsin Ali, Rui Santos, Luc Augustin, and Guillermo Carpintero

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-42-19-3872

We report on an optical frequency comb with 14 nm (∼1.8  THz$\sim 1.8\mathrm{THz}$) spectral bandwidth at a −3  dB$-3\mathrm{dB}$level that is generated using a passively mode-locked quantum-well laser in photonic integrated circuits 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 extracavity semiconductor optical amplifier as a booster amplifier. A 1.8-THz-wide optical comb spectrum is presented with an 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.