Abstract

Special designs of sampled Bragg gratings have been used to fabricate distributed-feedback semiconductor laser arrays with very precise wavelength spacing and strong coupling coefficients. By dividing one sampling period into two equal sections, each with a grating but with a $\pi$-phase shift between the sections, the $\pm 1$st-order channels are enhanced while eliminating the zeroth-order reflection. By using multiple phase-shifted sections, only the $-1$st-order channel is enhanced. Using a single electron beam lithography step and two $\pi$-phase-shifted sections, we have fabricated an eight-channel laser array with a channel spacing of 100 GHz.

© 2017 Optical Society of America

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