Fault tolerant fiber optic transmission system

Details Fault tolerant fiber optic transmission system Fault tolerant fiber optic transmission system

1991-10-18

1994-01-11

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359133, 359173, 385 31, H04J 1402, H04B 1000

Patent

active

052786889

ABSTRACT:
A fault tolerant fiber optic system has a plurality of lasers modulated by the same signal source. The signals from the lasers are conveyed to an optical coupler by single mode optical fibers. The signals from all of the lasers are mixed in the optical coupler, producing an output signal which is an average of the input signals from the lasers. The optical coupler has a plurality of output single mode fibers which can transmit the averaged signal to a number of optical receivers. By optically combining the signals in phase with each other, the failure of any laser decreases signal strength, but does not disable the system. Surprisingly, the averaging also has the capability of improving the carrier to noise and carrier to distortion ratios for the system, since noise and distortion from the lasers are not correlated and are diminished by a factor of N where N is the number of lasers.

REFERENCES:
patent: 4726644 (1988-02-01), Mathis
patent: 4882775 (1989-11-01), Coleman
patent: 4973169 (1990-11-01), Slonecker

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