Enhanced stability of quantum dot comb lasers

Authors: Liang, N., Yang, B., Chen, J., Cui, X., Qin, J., Wang, Z., Zhang, J. and Wang, T.

Journal: Optics Express

Volume: 33

Issue: 20

Pages: 42442-42457

eISSN: 1094-4087

DOI: 10.1364/OE.574075

Abstract:

The stability of multi-wavelength quantum dot comb lasers has been a significant concern for future industrial applications, which have not been systematically investigated to date. This work demonstrates that an optimum burn-in process effectively improves the overall stability of quantum dot comb lasers by accelerating the transition past the initial destabilization phase. Under burn-in conditions of 85 °C with injection current of 2×Ith (150 mA) and 3×Ith (225 mA), the threshold current variation is constrained within 10%, while the maximum optical power variation is maintained within 22%. Notably, after burn-in, the lasers exhibit increased optical bandwidth, indicating improved mode-locking performance, while the comb channel distribution remains uniform and consistent. Furthermore, the burn-in process does not affect the relative intensity noise level of comb lasers, which remains below -140 dBc/Hz at 100 MHz. In general, the results indicate that the stability of quantum dot comb lasers can be improved after an appropriate burn-in process for multi-wavelength data transmission.

Source: Scopus