Xu Dan-Xia, Delâge André, McKinnon Ross, Vachon Martin, Ma Rubin, Lapointe Jean, Densmore Adam, Cheben Pavel, Janz Siegfried, Schmid Jens H
Institute for Microstructual Sciences, National Research Council Canada, 1200 Montreal Road, Ottawa, Canada.
Opt Express. 2010 Feb 1;18(3):1937-45. doi: 10.1364/OE.18.001937.
We present an ultra-compact comb filter using an add-drop ring resonator with an Archimedean spiral cavity. The cavity consists of two interleaved spiral branches which are connected in the center using arcs of circle of a radius that causes minimum bend loss. We describe the design procedure and examine the physical parameters governing the resonator performance. As an example, we demonstrate experimentally a comb filter with a 25 GHz channel spacing made of silicon photonic wires and only occupies an area of 80 x 90 microm(2), approximately a 70 fold size reduction compared to a racetrack resonator. The filter transmission is free of spurious reflections, attesting to the smooth transition between different sections of the resonator cavity. Over a 40 channel wavelength span, the filter exhibits a quality factor Q > 35,000, extinction ratios > 10 dB, and an excellent power uniformity with variations < 0.5 dB for both the through and drop ports.
我们展示了一种使用带有阿基米德螺旋腔的分插环形谐振器的超紧凑梳状滤波器。该腔由两个交错的螺旋分支组成，它们在中心通过具有最小弯曲损耗半径的圆弧连接。我们描述了设计过程并研究了控制谐振器性能的物理参数。作为一个例子，我们通过实验展示了一种由硅光子线制成的具有25 GHz信道间距的梳状滤波器，其仅占据80×90微米²的面积，与跑道形谐振器相比尺寸减小了约70倍。该滤波器传输没有杂散反射，证明了谐振器腔不同部分之间的平滑过渡。在40个信道的波长范围内，该滤波器的品质因数Q>35000，消光比>10 dB，并且直通端口和下路端口的功率均匀性极佳，变化<0.5 dB。
