Multi-λ ridge waveguide gain-coupled DFB laser array

Abstract

Multi-wavelength gain-coupled quantum well DFB laser array has been fabricated on an InP substrate by simply varying the ridge waveguide width of the element lasers. Owing to the gain-coupling effect, seven singlemode lasing wavelengths around 1.55 /spl mu/m with /spl sim/2 nm spacing were obtained simultaneously. The lasers had low threshold currents and small beam divergence.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>