The first part of this paper reviews the spectrally resolvederbium-doped fiber model by Saleh, Jopson et al. (1990, IEEE PhotonTechnol. Lett 2, 714;1991, Fiber Laser Sources and Amplifiers III,Vol. 1851, pp. 114--119, SPIE).This model is adequate for fastsimulation of erbium-doped fiber amplifiers pumped at 980 or 1480 nmwhich are not self-saturated by amplified spontaneous emission noise.The second part of this paper reviews the wavelength-domainrepresentation of optical signals and network compo- nents at theoptical transport layer of multwiavelength optical networks. Thisrepresentation stems from the spectrally resolved model oferbium-doped fiber amplifiers. Optical signals are represented bytheir carrier wavelength and average power exclusively and not bytheir temporal waveform, as is customary in simulation of analog anddigital communication systems. In addition, network components arefully characterized by their loss or gain as a function ofwavelength. The wavelength-domain representation is adequate forefficient steady-state and transient power-budget computations; i.e.,it can be used to evaluate the optical signal, amplified spontaneousemission noise, and linear optical crosstalk average powers at allpoints in a multi- wavelength optical network. To illustrate thecapabilities of the spectrally resolved erbium-doped fiber model bySaleh, Jopson et al. and the wave- length-domain representation,transient power fluctuations caused by the dynamic interaction ofsaturated erbium-doped fiber amplifiers and servo- controlledattenuators in a bidirectional ring composed of four wavelengthadd-drop multiplexers are studied. The mechanisms responsible forthis oscillatory behavior are identified and remedies are proposed.
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