NDLI: Analysis of hot-potato optical networks with wavelength conversion

Content Provider	IEEE Xplore Digital Library
Author	Bononi, A. Castanon, G.A. Tonguz, O.K.
Copyright Year	1983
Abstract	The performance of wavelength routed optical networks (WRONs) employing packet switching critically depends on packet contentions at the intermediate nodes. This paper shows that, when the active nodes are provided with a number of optical receivers/transmitters equal to the number of wavelengths, routing without buffers, known as hot-potato [1], in conjunction with full wavelength conversion becomes an interesting option to solve contentions in packet switching WRONs with regular meshed topologies, such as Manhattan Street (MS) network and ShuffleNet (SN). We analytically compare three implementations of the access function: (1) local arrivals are centrally managed with tunable transmitters, (2) local arrivals are centrally managed with fixed transmitters, and (3) local arrivals are evenly split among fixed, independently managed transmitters. The analysis shows that the simpler access scheme (3), surprisingly, gives better throughput/delay results at high loads than the centrally managed schemes. Results also indicate that, by using more than four wavelengths, a 64-node MS or SN network can work at full load with a delay which is within one hop of its lowest achievable value. The probability of deflection can be made quite low by increasing the number of wavelengths. Another interesting finding is that delay-line optical buffers at the node are a much more effective way of solving contentions than using wavelength conversion: four or more wavelengths are needed in nodes without buffers and with wavelength conversion to match the performance of nodes with one delay-line optical buffer per wavelength and without wavelength conversion. However, optical buffers increase the accumulation of intraband crosstalk and amplified spontaneous emission noise, while wavelength conversion can provide noise suppression and signal reshaping. Hence, in WRONs with a small number of wavelengths, and when the transmission is feasible, it may be preferable to use optical buffers without wavelength conversion. On the other extreme, buffers are not needed with a large number of wavelengths and with full wavelength conversion.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	525
Ending Page	534
Page Count	10
File Size	270219
File Format	PDF
ISSN	07338724
Volume Number	17
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber networks Optical wavelength conversion Optical buffering Optical transmitters Propagation delay Crosstalk Wavelength routing Packet switching Tin Delay effects
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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