Performance degradation of multiwavelength optical networks due to laser and optical (de)multiplexer misalignments.
Item
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Title
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Performance degradation of multiwavelength optical networks due to laser and optical (de)multiplexer misalignments.
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Identifier
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AAI9707114
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identifier
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9707114
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Creator
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Khrais, Nidal Nuri.
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Contributor
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Adviser: Samir Ahmed
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Date
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1996
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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Laser misalignment tolerances for Wavelength Division Multiplexing (WDM) systems with two optical (de)multiplexers are almost the same at 2.5 Gb/s and 10 Gb/s per optical channel. For the three types of (de)multiplexers considered, (de)multiplexers modeled as third-order Butterworth filters have the highest misalignment tolerances, (de)multiplexers modeled as second-order Butterworth filters have lower misalignment tolerances, and (de)multiplexers modeled as first-order filters have the lowest misalignment tolerances. Using two (de)multiplexers modeled as second-order Butterworth filters, laser misalignments of about {dollar}\pm{dollar}30 GHz for 25 GHz (de)multiplexer misalignments produce 1 dB system excess loss. Even though the 1 dB system excess loss is a distortion-free criteria, it is found to produce very stringent misalignment tolerances. A more practical criteria occurs at 0.3 dB distortion-induced eye-closure penalty where the eye-diagram still looks good. Laser misalignment tolerances for WDM optical networks with a cascade of 2 to 100 (de)multiplexers modeled as either first-order filters or third-order Butterworth filters are evaluated at 0.3 dB distortion-induced eye-closure penalty. The results are dependent on the number of (de)multiplexers used, on the bit rate, and on the filter characteristic. We find that both the magnitude and the phase characteristics of the (de)multiplexers transfer function are important in determining the distortion-induced penalties. The allowable laser misalignment tolerances, at 10 GB/s and for systems using (de)multiplexes modeled as third-order Butterworth filters, vary from {dollar}\pm{dollar}78 GHz ({dollar}\pm{dollar}0.63 nm) for systems with a cascade of 2 filters to {dollar}\pm{dollar}18 GHz ({dollar}\pm{dollar}0.15 nm) for systems with a cascade of 100 filters.;A (de)multiplexer model is formulated. This model is general for any bit rate, any filter shape and phase, with any bandwidth, and for any number of (de)multiplexers in cascade.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
