Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 92: VCSELs, optical interconnects and Si photonics

HL 92.7: Talk

Thursday, March 19, 2015, 17:15–17:30, EW 202

Large frequency mode-locking of InP/InAs quantum-dot lasers — •Tagir Sadeev, Dejan Arsenijević, and Dieter Bimberg — Technische Universität Berlin Institut für Festkörperphysik

Passively mode-locked semiconductor lasers (MLL) are able to emit fs-short optical pulses at frequencies up to tens of GHz without any external frequency source. MLLs are of largest importance e.g. for ultra-high data rate optical transmission, clock sources and biomedicine. Significant improvements of the performance of MLL as well as continuous-wave lasers have been achieved in last decades, thanks to implementing zero-dimensional (quantum dot) structures into the active layer. Most advantages of QD MLL have been demonstrated for GaAs-based ones, operating at 1310 nm wavelength, targeting short-range telecom applications, where optical fiber exhibits zero dispersion. Long-haul optical transmission systems operate in the 1550 nm range, where fiber losses are minimal. At this wavelength InP based growth technology is common, but the brake-through results of QD MLLs are much scarcer as compared to their 1310 nm counterparts. In this work we investigate passive mode-locking of two-section QD MLL grown by metalorganic vapor phase epitaxy on InP substrate. We demonstrate monolithic two-section true QD MLLs at 1550 nm with better performance than yet reported: lowest optical pulse FWHM is 3.7 ps without any compression at 33.5 GHz repetition rate, which is noise-free and 300 MHz tuneable.