Fiber-optical system for transmitting multilevel signals

Details Fiber-optical system for transmitting multilevel signals Fiber-optical system for transmitting multilevel signals

1978-08-29

1980-07-08

Nelms, David C.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250205, 455612, 455618, G02B 2700

Patent

active

042119294

ABSTRACT:
To translate a train of binary electrical pulses into a multilevel luminous signal transmissible at a lower frequency, groups of two or more electrical pulses are temporarily stored in a shift register and then concurrently read out to a set of 2.sup.n -1 amplifiers feeding as many light emitters where n is the number of pulses per group. The connections between the shift-register stages and the amplifiers are so arranged that the collective intensity of the several light emitters assumes one of 2.sup.n possible levels according to the binary value of the pulse group stored in the register. The light sources jointly illuminate an optical fiber, with deviation of some of their rays to electro-optical feedback circuits for controlling the gain of the amplifiers to stabilize their output currents.

REFERENCES:
patent: 3809908 (1974-05-01), Clanton
patent: 3851167 (1974-11-01), Levine

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