High power operation of phase-shifted DFB lasers with amplitude modulated coupling coefficient

Abstract

The performance characteristics of amplitude modulated coupling (AMC) phase-shifted MQW DFB lasers emitting near 1.55μm are reported for the first time. The AMC is obtained by the holographic double-exposure technique; it provides single longitudinal mode oscillation up to 78mW for I = 500mA. This result confirms that AMC flattens the power distribution along the laser cavity. Linewidths as low as 600kHz have been obtained for cavities as short as 600μm at P = 15mW.