Open Access1x4 reconfigurable demultiplexing filter based on free-standing silicon racetrack resonators
Author(s) -
Po Dong,
Wei Qian,
Hong Liang,
Roshanak Shafiiha,
Xin Wang,
Dazeng Feng,
Guoliang Li,
J. E. Cunningham,
Ashok V. Krishnamoorthy,
Mehdi Asghari
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.024504
Subject(s) - resonator , free spectral range , multiplexing , optics , materials science , silicon , optoelectronics , channel spacing , wavelength division multiplexing , wavelength , physics , electronic engineering , engineering
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.