Lightwave transmission system using selected optical modes

Details Lightwave transmission system using selected optical modes Lightwave transmission system using selected optical modes

1993-04-07

1995-05-16

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Particular coupling function

385 50, 385 27, 385 42, G02B 628

Patent

active

054168627

ABSTRACT:
The capacity of a multi-mode optical fiber system, such as a local area network, is increased by selectively propagating only higher-order modes through the multi-mode fiber. Because only a small number of higher-order modes are propagated, pulse spreading induced by modal dispersion is minimized, and the bandwidth of the multi-mode fiber is increased. Because of the reduced modal dispersion, higher-order modes are recovered from the multi-mode fiber in accordance with the invention without filtering the output of the fiber. This renders the system less vulnerable to mechanical perturbations that are known to reduce the bit error rate of systems requiring filtering. Thus, by propagating only higher-order modes in this manner, the "bandwidth-distance" product of the multi-mode fiber is significantly increased.

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