R. Schatz et al., PARAMETER EXTRACTION FROM DFB LASERS BY MEANS OF A SIMPLE EXPRESSION FOR THE SPONTANEOUS EMISSION-SPECTRUM, IEEE photonics technology letters, 6(10), 1994, pp. 1182-1184
A simple expression for the amplified spontaneous emission from a lase
r biased below lasing threshold is applied to semiconductor laser para
meter extraction. We demonstrate that accurate measurement of the coup
ling coefficient for distributed feedback (DFB) lasers with phaseshift
s and end reflections is a practical possibility. It is also shown tha
t the used expression, for a reciprocal device, can be derived directl
y from the wave equation using the Green's function.