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Distributed ASE compensation for WDM systems
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this thesis was to explore the concept of amplified spontaneous emission (ASE) in erbium doped fiber amplifiers (EDFA) and to tailor compensations to minimize the effects it has on transmission performance in wavelength division multiplexing (WDM) systems. Simulations made in this thesis have shown that without compensation of ASE, the amplification of the signal power will be lowered. The existing linear compensation, which assumes that the amount of noise that arises is proportional to the gain of the signal, was examined by making measurements of noise power at different gains. It could be stated that it is sufficient for use at optimal gain with some deviations. As the size of the approved deviations was discovered to be dependent on channel placement, a compensation model that considers the wavelength dependence of the gain was invented and tested. If several amplifiers are placed in series, the total noise power will increase along the cascade, making it a major limiter of total system length. The noise coming into the amplifier will be considered signal power when using only the linear compensation. By sending the ratio between noise and tota power along the cascade, the effect of this accumulated ASE can be substantially reduced. When the chain is long, consideration of the gain curve shape can make further improvements. Bit error rate (BER) measurents were used to confirm the results of different compensation methods.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Optical networks, Erbium doped fiber amplifiers, EDFA, Amplified spontaneous emission, ASE, compensation of ASE
Keyword [sv]
URN: urn:nbn:se:ltu:diva-55023ISRN: LTU-EX--01/266--SELocal ID: beee23dc-637e-4c32-9dd4-8d8877a75be7OAI: diva2:1028404
Subject / course
Student thesis, at least 30 credits
Educational program
Engineering Physics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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