M. Okai et al., STRAINED MULTI-QUANTUM-WELL CORRUGATION-PITCH-MODULATED DISTRIBUTED-FEEDBACK LASER WITH ULTRANARROW(3.6 KHZ) SPECTRAL LINEWIDTH, Electronics Letters, 29(19), 1993, pp. 1696-1697
Introducing a 1% compressive strained multiquantum-well (MQW) active l
ayer into a corrugation-pitch-modulated distributed feedback (CPM-DFB)
laser reduces the linewidth floor (residual linewidth for extrapolate
d infinite output power) to 2 kHz and results in a linewidth-power pro
duct of 140kHz.mW. Strained MQW CPM-DFB lasers produced a 55mW output
with a spectral linewidth of only 3.6kHz.