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PLZT块（其充当电场诱导波长板）和设置成靠近或接触波长板的两个端面的两个偏振器组成。偏振片由金属和电介质交替叠层（LAMIPOL）组成。为了实现这种开关，我们开发了新的工艺，并对光器件进行了分析和部分制作. PLZT serotonin;为确定最佳成分和制备工艺，对不同条件下制备的PLZT进行了光电性能测试，确定了热等静压法制备PLZT的最佳成分为La/Zr/Ti=9/65/35. PLZT微调制器（波长板）：调制器是通过机械切割和光刻形成的脊型（60 × 60 × 980 <micrn>m）。它具有约50 MHz的调制带宽，10 V的开关电压和无插入损耗.偏光片由Al薄膜（~ 50）和SiO_2介电薄膜（~ 2000）交替堆叠而成。在低本底气压下溅射的Al膜和氧化硅膜的组合显示出良好的特性，在1.3 m波长处TE损耗为30 dB，TM损耗为0.4 dB<micrn>.纤维槽的形成;为了挖掘槽，NTT实验室发明了微振打技术。非常有用和强大。我们现在正在进行微细加工的培训。光纤型PLZT光开关的分析：该开关工作电压低（-30V），开关速度快（50 MHz以上），插入损耗低（-0.8dB），设备小型化（100 <micrn>m），最适合光纤传输系统。

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.