Fiber-coupled dual-mode waveguide interferometer with lambda/130 fringe spacing.
Predictions and measurements of a multimode waveguide interferometer operating in a fiber-coupled, "dual-mode" regime are reported. With a 1.32 microm source, a complete switching cycle of the output beam is produced by a 10.0 nm incremental change in the 8.0 microm width of the hollow planar mirror waveguide. This equates to a fringe spacing of approximately lambda/130. This is an order of magnitude smaller than previously reported results for this form of interferometer.
Optical Research and Consulting Business Group, QinetiQ, Malvern, Worcs WR14 3PS, United Kingdom. rmjenkins@qinetiq.com
Richard M
RM
Jenkins
Andrew F
AF
Blockley
J
J
Banerji
Alan R
AR
Davies