lambda /4-shifted InGaAsP/InP DFB lasers were fabricated by a novel method, that is, simultaneous holographic exposure of positive and negative photoresists. The lambda /4-phase-shift in the first-order corrugations formed on an InP substrate was confirmed through SEM views and diffracted beam patterns. A strong resonance peak below the threshold and single-wavelength operation above it at the Bragg wavelength were observed.
|Number of pages||3|
|Publication status||Published - 1984 Jan 1|
ASJC Scopus subject areas
- Electrical and Electronic Engineering