A development of a fiber-type PLZT optical switch

该项目的目的是开发光纤型PLZT光开关和技术。所提出的开关由具有凹槽的光纤、设置在凹槽中的充当电场感应波长板的PLZT块、以及靠近或接触波长板的两个端面的两个偏振器组成。偏振器由金属和介质交替叠层组成(LAMIPOL)。为了实现开关，我们开发了新的技术，并对光学元件进行了分析和部分制造。为了确定PLZT的最佳组成和制备工艺，测试了在不同条件下制备的PLZT的光学和电学性能。在HIP方法中，La/Zr/Ti=9/65/35是最佳的组成。PLZT微调制器(波长板)；该调制器是由机械切割和光刻形成的脊型(60x60x980；lt；microrn&gt；m)。它的调制带宽约为50 MHz，开关电压为10V，没有插入损耗。偏振器是由Al(-50A)薄膜和SiO_2(-2000A)介质薄膜交替堆叠而成。低本底气压下溅射的Al膜与蒸发法制备的SiO_2膜的结合显示出良好的特性，在1.3微米波长的TE损耗为30分贝，TM损耗为0.4分贝。形成纤维槽；挖掘槽，这是NTT实验室发明的微振打技术。是非常有用和强大的。我们现在正在接受微机械加工的培训。光纤型PLZT光开关的分析总而言之，这种开关可以在低电压(-30V)下工作，可以实现高开关速度(超过50 MHz)，允许低插入损耗(-0.8分贝)和设备小型化(长度为100微米和微米)，最适合于光纤传输系统。

The purpose of the project is the development of fiber-type PLZT optical switches and technology. The proposed switches are composed of an optical fiber which has a groove, a block of PLZT disposed in the groove, which acts as an electric field-inducing wavelength plate , and two polarizers disposed close to or in contact with both end surfaces of the wavelength plate. Polarizer consists of alternate lamination of a metal and dielectgric (LAMIPOL). To realize the switches, we have been developed new technology, and analized and partially fabricated the optical components.1. PLZT seramics ; To decide the optimum composition and fabrication process, optical and electrical properties of PLZT fabricated under various conditions have been measured.La/Zr/Ti=9/65/35 is the best composition in the HIP method.2. PLZT micro modulator (Wavelength plate); The modulator is a ridge type (60x60x980 <micrn>m) formed by mechanical cutter and photolithography. It has about 50 MHz modulation bandwidth, 10 V switching voltage and no insertion loss.3. LAMIPOLE; The polarizer is fabricated by alternately stachking thin films of Al (-50A) and dielectgric films of SiO2 (-2000A). The conbination of Al film sputtered under the Low background pressure and SiO2 film formed by evapolation shows good characteristics such as TE loss 30 dB and TM loss 0.4 dB at 1.3 <micrn>m wavelength.4. Formation of fiber groove; To excavate the groove, a micro-rapping technique invented by NTT Lab. is very useful and powerful. We are now under training of the micro-machining.5. Analysis of a fiberf-type PLZT optical switch; In summary, this switch can be operated at a low voltage(-30V), can achive a high switching speed (more than 50 MHZ),and allows low insertion loss(-0.8 dB) and miniturization of equipment(length 100 <micrn>m), and is best suited to fiber transmission systems.