The Design And Experimental Study Of High-speed Optical Switch Based On Transparent Ferroelectric Ceramics

Optical switch is a device which can switch or make on/off light route. It is a key component of Optical Add-Drop Multiplexers (OADM) and Optical Cross Connectors (OXC), so it has been widely used in optical fiber communication networks. In this dissertation, our research is on optical switch based on transparent ferroelectric ceramics with electro-optic effect; this kind of optical switch has many advantages such as high switching speed, low insertion loss and low crosstalk.In this dissertation, a novel optical switch with feedback control structure is proposed; the feedback control circuit and algorithm are designed and discussed. The optical switch can adjust the driving-voltage applied on the transparent ferroelectric ceramics according to the feedback signal of the control structure; therefore it can decrease crosstalk and have a better performance.In this dissertation, the structures of 1×2 and 2×2 optical switch using transparent ferroelectric ceramics are proposed and analyzed. Parameters of the components used in the structures are calculated and designed to accord with our requirements. Experiments about the novel optical switches are proposed and encapsulations of the switches are designed.Finally, experiments are conducted to test the main characteristics of the novel optical switches and the relationship between the optical power of optical switch and the voltage applied on transparent ferroelectric ceramics is discussed in detail. The experimental results have shown that the novel optical switch proposed have the features of high switching speed, polarization insensitivity, low insertion loss and low crosstalk.