1. State Key Laboratory on Integrated Optoelectronics, Changchun, ChinabJilin University, College of Electronic Science and Engineering, Changchun, China
2. Jilin University, College of Electronic Science and Engineering, Changchun, China
3. State Key Laboratory on Integrated Optoelectronics, Changchun, ChinabJilin University, College of Electronic Science and Engineering, Changchun, ChinacJilin Provincial Engineering Laboratory on Polymer Planar Lightwave Circuit, Changchun, China