Dong Po, Qian Wei, Liang Hong, Shafiiha Roshanak, Wang Xin, Feng Dazeng, Li Guoliang, Cunningham John E, Krishnamoorthy Ashok V, Asghari Mehdi
Kotura Inc., 2630 Corporate Place, Monterey Park, California 91754, USA.
Opt Express. 2010 Nov 22;18(24):24504-9. doi: 10.1364/OE.18.024504.
We present a 1x4 reconfigurable demultiplexing filter based on cascaded thermally tunable silicon racetrack resonators with ultralow tuning powers. The use of free-standing silicon resonators with undercut structures significantly reduces the tuning power, with a figure of ~2.9 mW per free spectral range. Even with the presence of thermal crosstalk between two adjacent resonators, we demonstrate multiplexing functionality for channel spacings of 200 GHz, 100 GHz, and 50 GHz, with channel wavelengths aligned to International Telecommunication Union (ITU) grid specifications. Crosstalk values for 200 GHz and 50 GHz channel spacings are less than -20 dB and -11.5 dB, respectively. The total power to achieve this performance is in the range of 1.84 mW to 2.4 mW. Such low-power, compact, and reconfigurable filters are particularly useful in chip-scale optical interconnects.
我们展示了一种基于级联热可调谐硅环形谐振器的1x4可重构解复用滤波器，其具有超低的调谐功率。使用具有蚀刻结构的独立式硅谐振器可显著降低调谐功率，每自由光谱范围约为2.9毫瓦。即使相邻两个谐振器之间存在热串扰，我们仍展示了针对200吉赫兹、100吉赫兹和50吉赫兹信道间距的复用功能，信道波长符合国际电信联盟（ITU）网格规范。200吉赫兹和50吉赫兹信道间距的串扰值分别小于-20分贝和-11.5分贝。实现此性能的总功率在1.84毫瓦至2.4毫瓦范围内。这种低功耗、紧凑且可重构的滤波器在芯片级光互连中特别有用。
