23 and 39 GHz low phase noise monosection InAs/InP (113)B quantum dots mode-locked lasers

Abstract

Here we report for the first time a passive mode-locking of single section Fabry-Perot (FP) lasers based on InAs quantum dots(QDs) grown on (113)B InP substrate. Devices under study are a 1 and 2 mm long laser diodes emitting around 1.58 µm. Self-starting pulses with repetition rates around 23 and 39 GHz and pulse widths down to 1.5 ps are observed after propagation through a suitable length of single-mode fiber for intracavity dispersion compensation. A RF spectral width as low as 20 kHz has been obtained leading to a low timing jitter RMS.

Self-assembled InAs/InP quantum dots and quantum dashes: Material structures and devices

“…In addition, achievement of repetition rates as low as 10 GHz and as high as 100 GHz from 2.5×430 µ m 2 and 2.5×4300 µm 2 Qdot modelocked lasers, respectively, highlights the achievements of InAs/InP Qdot active media in mode locking. Very recently, apart from the leading (100)InP based Qdot mode-locked lasers, selfpulsation in InAs/InGaAsP Qdots lasers on (311)B InP substrate was also reported by Klaime et al [106] with repetition rates around 23 and 39 GHz and pulse width down to 1.5 ps. The 2×1000 µm 2 and 2×2000 µm 2 ridge-waveguide devices exhibited extremely low RF spectral width of 20 kHz indicating very low timing jitter.…”

“…The GS and ES lasing were observed at 1.54 µm and 1.5 µm, respectively. The significant improvement in the growth of the material quality was substantiated by: (i) lasing wavelength at 1.52 µm, originated from a single Qdot active layer on (311)B InP substrate under pulsed current injection [66], (ii) highest reported modal gain of 13 cm -1 from a single stack InAs/InP Qdot laser [7,66], (iii) the largest dot density of 1.3×10 from Qdot lasers on (311)B InP [106]. However, the temperature stability of the InAs/InGaAsP Qdots lasers were comparatively poor compared to their InAs/InGaAlAs Qdots laser counterparts, due to the low conduction band offset arising from the mere 25-50 K characteristics temperature T 0 [101].…”

1.55-μm mode-locked quantum-dot lasers with 300 MHz frequency tuning range

“…Reports on modelocking observed in QDash single-section lasers show both ex facet sub picosecond 10 and ps range pulse emission after compression with low timing jitter. 11,12 In Ref. 13 chemical beam epitaxy grown single-section QD laser demonstrates ex facet 295 fs pulses at 50 GHz.…”