Theoretical and experimental investigations about wavelength switching of a current tuned multi-section DFB laser based on REC technique

The wavelength-switching time of a multi-section tunable semiconductor distributed feedback (DFB) laser based on reconstruction equivalent chirp (REC) is studied and measured. The measurement system is based on the Mach-Zehnder interferometer (MZI) with two arms having almost the same length. The measurements are studied both in theory and experiments. All the results are presented and discussed, to help the optimization of testing and packaging such tunable lasers in future.