Importance

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Abstract

A system for amplifying separate optical signals traveling in a forward path and a reverse path over an optical communications system used for CATV program distribution. A first and second optical circulator, each having a first, second, and third port, are connected to respective opposite sides of a bi-directional amplifier. The first port of the first circulator inputs a first optical signal traveling in the forward path. The second port of the first circulator is coupled to an input/output port of the amplifier. The third port of the first circulator outputs an amplified second signal traveling in the reverse path. The second circulator is similarly connected to the side of the amplifier. A first and second signal/signal WDM coupler, each having a pass port P, an add port A/D, and a common port C, are coupled to the first and second optical circulators, respectively. The first port of the first optical circulator is connected to the pass port of the first signal/signal WDM coupler, and the third port of the first optical circulator is connected to the add port of the first signal/signal WDM coupler. The common port of the first signal/signal WDM coupler outputs an amplified second path signal and inputs a first path signal. The second signal/signal WDM coupler is similarly connected to the second optical circulator and outputs an amplified first path signal and inputs a second path signal. In this manner, the present invention provides bi-directional amplification of signals traveling in opposite paths on a single fiber communications link.

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First Claim