Abstract
Sampled grating DBR (SGDBR) based laser arrays were demonstrated to be feasible for realizing monolithically integrated DWDM sources. In order to ease the post-fabrication wavelength control for SGDBR laser arrays, the influence of the sampling duty cycle and the difference of reflection peak spacing is analyzed and investigated experimentally for achieving the best side-mode suppression ratio (SMSR) of a SGDBR laser array. It is found that such type of laser arrays can have good tolerance on the mirror misalignment. We demonstrated arrays with uniform wavelength combs of 32 wavelengths in 0.8 nm wavelength spacing. Both high SMSR and accurate wavelength registration are achieved for all lasers in an array. We also demonstrated 16-wavelength laser arrays of 50 GHz spacing whose wavelengths are aligned to the ITU grid with single-electrode operation.
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