Fourier analysis of a polymer directional coupler electro-optic switch with two-section cosine-transitive CPWG electrodes: A new theoretical view

详细信息    查看全文

• 作者：Rui Wang^a ; Chuan-Tao Zheng^a ; ^{zhengchuantao578@163.com} ; ^{zhengchuantao@jlu.edu.cn} ; Qiang Song^a ; Lei Liang^a ; Chun-Sheng Ma^a ; Zhan-Chen Cui^b ; Da-Ming Zhang^a
• 关键词：Electro-optic switch ; Fourier analysis ; 3-dB modulating bandwidth ; Cutoff switching frequency
• 刊名：Optics Communications
• 出版年：2012
• 出版时间：15 March 2012
• 年：2012
• 卷：285
• 期：6
• 页码：1103-1112
• 全文大小：1527 K

文摘

By using two-section cosine-transitive coplanar waveguide grounded (CPWG) electrodes, a polymer directional coupler (DC) electro-optic (EO) switch is optimally designed with both relaxed fabrication tolerance under cross-state and high switching speed over 100 GHz. As a new theoretical view, based on Fourier transformation, a Fourier analysis technique and related formulas are presented with respect to the time- and frequency-domain responses under high-speed modulating and switching operations. Under 1550 nm, the bar- and cross-state voltages are 0 and 2.669 V, respectively, for the switch with a total length of 8378 ¦Ìm. The insertion loss and crosstalk are less than 3.887 and ?#xA0;30 dB, respectively. The 3-dB modulating bandwidth and cutoff switching frequency are about 110 and 131.6 GHz, respectively, and the 10-90 % rise time and fall time are both about 3.80 ps. Owning to this configuration, its cutoff switching frequency is enhanced to 9 times of that of our previously reported EO switch with two-section separated reversed electrodes, which expands the ultra-high speed and large capacity applications for such switches. The proposed Fourier analysis method can also be adopted to evaluate the responses under the operation of any other form driving signals with Fourier transformation.