We present re-growth free DBR lasers based on high-order slotted surface-gratings using narrow slot widths ~100 nm through standard photolithography. The fabricated single mode laser worked with a short cavity length of 230 μm. The threshold is about 27 mA with side-mode suppression-ratio (SMSR) > 40 dB and slope-efficiency ~0.1 mW/mA.

© 2019 The Author(s)

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