Abstract
We report on the fast wavelength switching in V-cavity laser (VCL) with quantum well intermixed tuning section. The laser wavelength can be switched between 32 channels at 100 GHz spacing using a single electrode control. The fabrication process involves a quantum well intermixing (QWI) process using KrF laser irradiation and rapid thermal annealing (RTA). The tuning current is less than 40 mA, much lower than previously demonstrated tunable VCL based on electro-thermal-optic effect. The wavelength switching is also faster by three orders of magnitude. The dynamic switching characteristics between two channels with different numbers of intermediate channels are investigated. It shows that the switching time is about 1 ns between adjacent channels and increases up to 12 ns with increasing number of intermediate channels.
Highlights
Tunable lasers that are capable of tuning to any channel on the international telecommunication union (ITU) grid will dramatically reduce the cost of the optical telecommunication systems [1]
We report on the fast wavelength switching in V-cavity laser (VCL) with quantum well intermixed tuning section
The tuning current is less than 40 mA, much lower than previously demonstrated tunable VCL based on electro-thermal-optic effect
Summary
Tunable lasers that are capable of tuning to any channel on the international telecommunication union (ITU) grid will dramatically reduce the cost of the optical telecommunication systems [1]. One of the most simple and promising techniques for active-passive integration is quantum well intermixing (QWI) In this technique, point defects are firstly generated on the surface of the sample. There are many QWI techniques reported in the past decades, such as impurity induced disordering (IID) [6], impurity free vacancy disordering (IFVD) [7], argon plasma induced disordering [8], ion implantation induced disordering (IIID) [9] and SiO2 sputtering induced disordering [10] Most of these techniques lack the reproducibility and the reliability required for industrial fabrication. KrF laser irradiation based QWI is recently reported to be potentially attractive due to its high reproducibility and reliability [11,12] We used this technique to selectively modify the QW energy band gap in the tuning waveguide sections. The wavelength switching time between two channels with different intermediate channel numbers are investigated
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