Optical Amplifier Applications in Fiber Optic Local Networks

The number of waveguide taps N that a passive optical fiber bus can accommodate is typically quite low, due to significant attenuation of the signal in the taps and splices. In an effort to increase N substantially, this paper investigates the potential use of optical amplifiers to boost the signal along the bus. An analysis is performed for both direct detection and heterodyne detection. Values of N are determined for a wide range of system and device parameters, such as signal duration, amplifier noise bandwidth, and amplifier saturation power. It is found that the use of optical amplifiers can increase N by at least an order of magnitude, and by as much as two orders of magnitude under many circumstances.

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