Abstract
Phase-shifted first-order gratings for 1.3 μm distributed-feedback (DFB) lasers have been fabricated in InP by fast direct e-beam lithography. The two-layer resist system consisted of a highly sensitive (∼3 μC/cm2) positive organosilicon e-beam resist, poly(3-butenyltrimethylsilane sulfone) (PBTMSS), and a bottom layer of diamond-like carbon (DLC). The high quality of these gratings was reflected in the excellent characteristics of the DFB lasers.
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