Active Multi-wavelength Solc-type filter based on MgO:APLN

摘要

In this paper, the multi-wavelength Solc-type filter based on MgO:APLN (aperiodically poled lithium niobates) is studied theoretically and simulated. The sequences of the domains in MgO:APLN are optimized to realize the prescribed multiple wavelengths filtering using the novel algorithm. In single domain of MgO:APLN, the output electric field component is calculated by using Runge-Kutta method, which is used as the initial electric field component of the next domain. The output electric field component is obtained by iterative above operation, and finally the transmittance of Solc-type filter is calculated. The transmittance characteristics of Solc-type filter at 1470nm and 1570nm under different polarization structures are simulated. It is found that when the applied electric field is 120V/mm and the crystal nonlinearity coefficient is 1:1, the transmittance of 1470 and 1570 nm can reach at 100%. Furthermore, while maintaining the crystal polarization structure, the transmittance of Solc-type filter under different electric fields is simulated, and it is found that the transmittance of 1470nm and 1570nm increases with the applied electric field intensity, that is, the modulation of transmission power by applied electric field is realized. The accuracy of this method is verified by experiments. This method is suitable for the optimization design of any multi-band Solc-type filter and provides theoretical support for the development of WDM, DWDM and HSRL.