Missing modes in 1.3 /spl mu/m InGaAsP/InP uncooled Fabry-Perot lasers and their effect on transmission performance

The most economical modulation format solution is probably direct modulation deploying uncooled Fabry-Perot (FP) lasers for low-cost fiber optic links. However, transmission performance using uncooled FP lasers can be significantly affected by longitudinal mode characteristics such as mode modulation (=mode missing) and TE-TM mode switching (modal instability). Therefore it is necessary to understand mode missing and transmission performance including the lasing spectrum of the uncooled FP laser with missing modes. From the measurements of longitudinal mode spectra of 1.3 /spl mu/m InGaAsP/InP Fabry-Perot lasers, we can find that five lasers out of 25 lasers satisfy the missing mode condition. The measured spectra moved to longer wavelength because of the gain curve shifts toward longer wavelength with increasing temperature.