Wide wavelength tuning of sampled grating tunable twin-guide laser diodes

摘要

Tunable laser diodes with a tuning range of several tens of nanometers are generally being acknowledged as keycomponents for future generation optical networks. However, all presently available devices suffer from several seriousdrawbacks. The most well-known issue is the time-consuming calibration procedure that has to be carried out for everysingle device.Recently the so-called sampled or superstructure grating tunable twin-guide or (S)SG-TTG laser diode has beensuggested to overcome some of the prevailing problems. In this paper we will present tuning characteristics of firstdevices and discuss the influence of facet reflections on the tuning behaviour.The widely tunable twin-guide laser diodes operate around 1.55 μm and have a continuous tuning range of ~ 2 nm.However, by utilizing Vernier-effect tuning, the overall quasi-continuous tuning range is extended to 28 nm. Within thistuning range, five supermodes can be continuously tuned without the occurrence of any mode hops. The side-modesuppression ratio is kept between 25 and 37 dB.