Experimental demonstration of the combined phase and amplitude facet reflectivity effects on the chirp of a 10 Gbit/s integrated laser-modulator source

We experimentally show that laser and modulator facet phases with respect to the DFB laser grating are as important for the chirp as the modulator facet reflectivity given a 10 Gbit/s integrated laser-modulator source. We have presented a way to assess not only the modulator induced chirp but also the laser induced chirp of an integrated laser-modulator device. We have shown the influence of the modulator facet reflectivity and the major role of the facet phase versus the DFB laser grating on the chirp. We conclude that the facet reflectivity determines the 10 Gbit/s performance yield rather than individual chip behaviour.