Abstract
Dense-wavelength-division multiplexed multichannel systems have the potential to provide enormous aggregate capacity. Such networks may require Fabry-Perot (FP) filters to demultiplex the channels and optical amplifiers, such as erbium-doped fiber amplifiers, to compensate for splitting or transmission losses.1 Although these amplifiers provide gain, they also introduce amplified spontaneous emission (ASE) noise which beats with itself and all the channels passing through the filter.2 In this paper, relevant noise sources are identified when utilizing a FP filter demultiplexer. Using Lorentzian approximations, simple expressions which contain easily measurable parameters are derived for both the signal-to-noise ratio (SNR) and power penalty. The optical filter must be amply wide to transmit the selected signal but sufficiently narrow to limit the ASE-related noise. The power penalty from rejected channels is weakly related to the ASE and decreases rapidly as the spacing increases.
© 1992 Optical Society of America
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