Survivable and scalable multiwavelength ring network architectures for broad-band fiber optic networks: An experimental demonstration.
Item
-
Title
-
Survivable and scalable multiwavelength ring network architectures for broad-band fiber optic networks: An experimental demonstration.
-
Identifier
-
AAI9721840
-
identifier
-
9721840
-
Creator
-
Shehadeh, Fatimah M.
-
Contributor
-
Adviser: Mohammed Ali
-
Date
-
1997
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Engineering, Electronics and Electrical
-
Abstract
-
The explosive growth of on-line services, and the emergence of broadband services, require large and immediate increases in network capacity. Extensive research is being conducted in the fiber optic communication area to provide the required increase in bandwidth. The key element for the realization of this high capacity network is the Wavelength Division Multiplexing (WDM) technology, which allows many channels to propagate independently in the fiber. Another critical element is the Erbium-Doped-Fiber Amplifier (EDFA), to compensate for the losses suffered by these WDM devices and the transmission along the fiber.;The WDM devices studied in this work are provided by two different suppliers, each employing a different design technology. The two WDM technologies are compared in term of their insertion loss, polarization dependent loss, crosstalk, and accuracy of channel spacing.;EDFA, the second element studied, is characterized by large bandwidth, high gain, and non-uniform wavelength dependent gain. The last characteristic listed causes design problems for transmission systems when a chain of EDFAs is used. In this work, we demonstrate a simple technique to equalize the EDFA's gain, employing variable optical attenuators. The gain stability of the EDFA during the loss of input signals (due to network configuration changes or equipment failure), is also studied. Three stabilizing techniques requiring feedback are demonstrated and compared. In this study, both co- and counter-propagating control signals are used, as well as control of the pump power. A third stabilization scheme is introduced, based on saturating the amplifier without relying on feedback control. When this scheme is used, 1dB increase of one surviving channel is measured when 7 signals are lost, for the case of 3 EDFAs in cascade.;Finally, a ring network is built, employing optical nodes consisting of both WDM technologies and EDFAs to compensate for insertion losses. For this work, signals were launched at 2.5 and 10Gb.s per channel, in an 8-node, 8 wavelength ring. Less than 1dB in system penalty is measured at the 8{dollar}\sp{lcub}\rm th{rcub}{dollar} node. We also, study the impact of laser misalignment on the cascaded WDM elements in such a ring. For {dollar}\pm{dollar}0.3nm shift in signal wavelength, approximately 1.5dB is measured at the 8{dollar}\sp{lcub}\rm th{rcub}{dollar} node, for 10Gb/s transmission.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
