@article { Lu15, title = {Broadband silicon photonic directional coupler using asymmetric-waveguide based phase control}, journal = {Opt. Express}, volume = {23}, year = {2015}, month = {02/2015}, pages = {3795--3808}, publisher = {OSA}, type = {article}, abstract = {We design and demonstrate broadband directional couplers that use asymmetric-waveguide based phase control sections, on the silicon-on-insulator platform. Broadband directional couplers with various power splitting ratios, including 10%/90%, 20%/80%, 30%/70%, 40%/60% and 50%/50%, were realized for both transverse electric (TE) and transverse magnetic (TM) modes. Some of the devices exhitbit bandwidths in excess of 100 nm, and all in excess of 75 nm. The footprints of the TE mode couplers are 32 ?m 1.3 ?m, or less, and those of the TM mode couplers are 13 ?m 1.3 ?m, or less. }, keywords = {Integrated optics devices; Waveguides}, URL = {http://www.opticsexpress.org/abstract.cfm?URI=oe-23-3-3795}, author = {Zeqin Lu and Han Yun and Yun Wang and Zhitian Chen and Fan Zhang and Nicolas A. F. Jaeger and Lukas Chrostowski} }