Optical communication is heading to high speed, broad bandwidth and large capacity, and it is more and more important to develop optical devices with superior performance and lower cost. Electroabsorption modulated laser (EML) is the ideal light source in long-reach and high speed optical communication at home and abroad because of its small size, tiny chirp, low driving voltage and high relaxation oscillation frequency. However, EML is very sensitive to temperature and the slight changes in temperature will affect the stability of operation. Therefore, it is a technical problem to keep the wavelength and output power stable and extend the life of the EML. Current research and development of cooled laser and the two main device packaging technologies are introduced and a prediction on small-form cooled EML in the future is made.