微带线控制的磁流体微环光开关结构、原理与设计

Silicon-based magnetic fluid optical switch with micro-ring resonator controlled by micro-strip circuit

提出了一种微带线控制的磁流体微环光开关芯片结构,其中硅基微环谐振器波导的内外两侧集成有环状金属微带线,且两个环状金属微带线中所通电流方向相反。当芯片上覆盖有铁磁流体时,通过改变输入到金属微带线的电流大小可实现光开关功能。以单个微环谐振器情形为例,描述了这种铁磁流体开关结构的优化设计过程,仿真分析了微环周长、输入输出硅线波导与硅基微环之间耦合比及磁场强度等参数对磁流体微环光开关特性的影响。研究表明,在1550 nm工作波长处,只需施加150 Oe的开关磁场(对应的微带线电流约为447 mA)即可实现消光比为10 dB的微环光开关功能。

A novel optical switch chip structure of magnetic fluid cladding micro-ring resonator driven by micro-strip circuit is presented.Two metal micro-strip circuits with opposite current directions are integrated on both sides of the silicon-based waveguide forming the micro-ring resonator,and then the resulting micro-ring chip is claded with a magnetic fluid film.The optical switching function is implemented by controlling the micro-strip circuit.Taking a single micro-ring resonator as an illustration,we describe the design process for this kind of magnetic fluid-based optical switch,and analyze by simulations the switching characteristics dependent on the micro-ring circumference,the coupling ratio between the micro-ring and the input/output wire waveguide,and the applied magnetic field.Our simulations show that,for a single micro-ring optical switch with the extinction ratio of 10 dB at operating wavelength of 1550 nm,the desirable switching magnetic field may be as low as 150 Oe,corresponding to the micro-strip current of about 447 mA.