Accuracy on emitted wavelengths in DFB laser arrays resulting fromthe longitudinal mode selection mechanism

摘要

We compare the merit of various longitudinal mode selectionnmechanism in distributed feedback laser for application as arrayednsources in the wavelength-division multiplexing context. Phase-shiftednand complex-coupled laser arrays have been fabricated and characterized.nWe propose that the dispersion on the emitted wavelengths is stronglyncorrelated to the field localization along the cavity. By comparison ofnthe dispersion values measured within the laser arrays, we can concludenthat the complex grating with gain is the best suitable mechanism fornhigh wavelength accuracy and stability, due to the strong andndistributed localization of the field in the gain sections of eachnperiod of the grating