Bimodal optical fiber communication system using graded index fi

Details Bimodal optical fiber communication system using graded index fi Bimodal optical fiber communication system using graded index fi

1986-04-03

1989-03-28

Moskowitz, Nelson

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9618, 370 1, 250231R, G02B 514

Patent

active

048172057

ABSTRACT:
An optical communication system in which at least two separate modal groups are launched into a single graded index transmission fiber. The system includes two light sources and a lens to focus the light sources into the transmission fiber. A spatial filter is used to selectively limit the angles of incidence of the light on the fiber, and operates in conjunction with the lens to launch light from one source at appropriate angles and points of excitation to excite higher-order modes in the fiber, and to launch light from the other source at appropriate angles and points of excitation to excite lower-order modes in the fiber.

REFERENCES:
patent: 3157726 (1964-11-01), Hicks, Sr. et al.
patent: 4504111 (1985-03-01), Hunzinger
Berdague et al, "Mode Division Multiplexing an Optical Fibers", 6/1/82, pp. 1950-1955, Applied Optics, vol. 21, #11.

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