Ultra-compact, flat-top demultiplexer using anti-reflection contra-directional couplers for CWDM networks on silicon
Publication Type:Journal Article
Source:Opt. Express, OSA, Volume 21, Number 6, p.6733--6738 (2013)
Keywords:Gratings; Integrated optics devices; Waveguides; Wavelength filtering devices
Wavelength-division-multiplexing (WDM) networks with wide channel grids and bandwidths are promising for low-cost, low-power optical interconnects. Wide-bandwidth, single-band (i.e., no free-spectral range) add-drop filters have been developed on silicon using anti-reflection contra-directional couplers with out-of-phase Bragg gratings. Using such filter components, we demonstrate a 4-channel, coarse-WDM demultiplexer with flat passbands of up to 13 nm and an ultra-compact size of 1.2 \&\#x000D7; 10\&\#x02212;3 mm2.