Founded in 2001,Shanghai dowson communication Co.,Ltd.. is a hi-techenterprise dedicated to research manufacturing and marketing of optical communication system. The new generation optical coupler manufacturing system developed by dowson features incomparable accuracy in stage movement,easy to use Graphic User Interface,powerful process management software, and flexibility for manufacturing proces changes. the optical coupler manufacturing system provides the most relicale solution for fabricating standard andspecial feature couplers with high yields,this system enables the end products to have ideal output with low polarization-dependent loss(PDL),low excess loss and high repeatable coupling ratios.