A micro polarized beam splitter for DWDM

The key technology to make a micro polarized beam splitter(PBS)used as optical switcher and polarization-free isolator in the DWDM system is discussed.The optical film is designed with optimum method.The tolerance of the layer is modeled through Monte Carlo method in order to obtain simple manufacture process.The film thickness error of the each layer is obtained by calculating the Macleod maximum sensitivity.The film thickness is controlled by modeling the optical monitoring processes.A practical cemented prism is designed,and a PBS prism with advanced technique parameters is obtained.The results show that the optical cold machining for the prism is the base to make the PBS,the key issue and difficulty are optical film design and coating,and it is also important to cement the prism.