The coupling length of a directional coupler is strongly polarization dependent, especially for use in wave guide tap monitoring applications. To avoid severe polarization and maximize the wavelength flatness of optical waveguide taps, a thick silicon-on-insulator (SOI) platform and Mach–Zehnder directional couplers implemented with the bending effect illustrated low coupling loss to a SMF-28 fiber, low polarization dependence, and insensitive wavelength on the tap port for monitoring applications. Our results demonstrated that the optical waveguide tap, which carries a portion of the light signal, showed a 0.077 coupling ratio and for the polarization-dependent loss. The wavelength variation for the coupling ratio was less than 4% across the entire C-band. A per interface coupling loss was also achieved between the thick SOI waveguide and the SMF-28 fiber.
© 2010 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
J. Opt. Soc. Am. B 27(5) 941-947 (2010)
Opt. Lett. 34(12) 1798-1800 (2009)
Yangjin Ma, Yang Liu, Hang Guan, Alexander Gazman, Qi Li, Ran Ding, Yunchu Li, Keren Bergman, Tom Baehr-Jones, and Michael Hochberg
Opt. Express 23(12) 16052-16062 (2015)