In a multimode step-index fiber the propagation angle of a beam is conserved over short distances even if the fiber is bent slightly. This behavior can be exploited for a multiplexed signal transmission by the assignment of different channels to different propagation angles [angle-division multiplexing (ADM)]. Thus parallel transmission can be achieved. Because each channel occupies only a subrange of the fiber’s numerical aperture, modal dispersion is reduced compared with single-channel transmission through the same fiber. The transmission properties of an ADM-based transmission line are analyzed for short propagation distances. Passive all-optical setups for multiplexing and demultiplexing operations are proposed. Cross-talk measurements are shown for a transmission with a length of 8 m and 13 multiplexed channels.
© 2000 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.4510) Fiber optics and optical communications : Optical communications
(130.1750) Integrated optics : Components
Ulrich W. Krackhardt, Róbert Klug, and Karl-Heinz Brenner, "Broadband Parallel-Fiber Optical Link for Short-Distance Interconnection with Multimode Fibers," Appl. Opt. 39, 690-697 (2000)