低串扰聚合物交叉耦合串联五环谐振电光开关

利用两组串联五环谐振器以及它们与两信道波导的交叉耦合作用,优化设计并模拟了一种超低串扰2×2新型聚合物电光开关.为了表征器件的输出光功率特性,给出了器件结构、分析理论和相关公式.为了在下行端口（drop端口）得到箱型光谱响应以及极低的串扰和插入损耗,优化了微环谐振级数和耦合间距.对器件输出光功率和输出光谱的模拟分析结果显示,器件交叉和直通态间的切换电压为4 V,交叉和直通态下两端口间的串扰分别为－66 dB和－54.7 dB,插入损耗分别为2.34 dB和 0.24 dB.在1 GHz方波信号作用下,器件drop端口的上升和下降时间分别为15 ps和90 ps.由于聚合物微环的弯曲半径仅为19.45 μm,因此该器件具有超紧凑的尺寸,其长度和宽度仅为0.407 mm,约为马赫-曾德尔干涉仪或者定向耦合器等一般结构聚合物电光开关长度的1/10.依赖于小的封装尺寸和极低的串扰,该器件可以高密度地集成在光电子芯片上,在光片上网络中光信号的控制方面具有潜在的应用.

Abstract

A novel 2×2 polymer electro-optic switch was optimized and simulated based on two-group five-serial-coupled microring resonator and their cross-coupling with two channel waveguides. Detailed structure, theory and formulation were available to characterize the output powers of the switch. For realizing boxlike spectrum (drop port) as well as low crosstalk and insertion loss, resonance order and coupling gaps were optimized. Analysis and simulation on output powers and output spectrum indicated that, a switching voltage of about 4.0 V was desired to realize the exchange between cross-state and bar-state; the crosstalk under cross state and bar state were extremely low as －66 dB and －54.7 dB, respectively; the insertion losses under the two operation states were 2.34 dB and 0.24 dB, respectively. For the drop port, the 10%~90% rise time and fall time were estimated to be 15 ps and 90 ps, respectively, under the operation of 1 GHz switching operation.The bending radius of each electro-optic polymer microring was as small as 19.45 μm, leading to ultra-compact size of only 0.407 mm in both length and width, which was nearly 1/10 of the length of Mach-Zehnder interferometer or directional coupler type polymer electro-optic switches. Consequently, because of small footprint size and extremely low crosstalk, this switching configuration can be densely integrated onto optoelectronic chips, and thus it possesses potential applications in optical signal control in optical networks-on-chip.

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郑传涛, 罗倩倩, 孙长轮, 杜巧玲, 张大明, 王一丁. 低串扰聚合物交叉耦合串联五环谐振电光开关[J]. 光子学报, 2014, 43(3): 0313001. ZHENG Chuan-Tao, LUO Qian-Qian, SUN Chang-Lun, DU Qiao-Ling, ZHANG Da-Ming, WANG Yi-Ding. Polymer Electro-optic Switch Using Cross-coupling Five-serial-coupled Microring Resonator with Ultra-low Crosstalk[J]. ACTA PHOTONICA SINICA, 2014, 43(3): 0313001.

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