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SUMMARY:Efficient Photonic Coding: a Considered Revision - Yury Audzevich 
 (University of Cambridge)
DTSTART:20110811T150000Z
DTEND:20110811T160000Z
UID:TALK32366@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:In this talk we reconsider the energy consumption of tradition
 al DC-balanced physical line coding schemes applied to optical communicati
 on. We demonstrate that not only does an implementation of the popular 8B1
 0B coding scheme have higher power consumption than the optical power requ
 irement\, but actually has higher power consumption when transmitting idle
  sequences than for real data packets. Furthermore\, we show that simple c
 odes retain the DC balance performance of 8B10B and hence do not increase 
 the optical power requirement. We propose the use of a coding scheme that 
 permits a default-off transmission system through the addition of a preamb
 le. By analysis of trace data taken from a network covering a 24 hour peri
 od\, we show that the power saving is up to 93%. The proposed approach not
  only enables energy proportional links but is fully compatible with futur
 e low power optical switched networks.\n\n\n
LOCATION:FW26\, Computer Laboratory\, William Gates Builiding
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