Abstract
The use of a rectangular core fiber is suggested for mode division multiplexed optical communication, and as an alternative fiber geometry having advantageous transmission and component integration attributes. The rectangular core is constrained to support single transverse modes in one direction and multiple modes in the horizontal transverse direction. The supported modes are thus polarization degenerate only (i.e., TE1x and TM1x), with well separated momenta and favorable mode profiles for device coupling and wavelength multiplexing and manipulation. A fiber prototype is experimentally characterized for its modal delays and field profiles by time-gated interferogram analysis.
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