Optical Networks - _Problems10_140

Optical Networks- - 698 Photonic Packet Switching time domain or in the frequency domain The codes are carefully designed so that many transmitters

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698 Photonic Packet Switching time domain or in the frequency domain. The codes are carefully designed so that many transmitters can transmit simultaneously without interfering with one another, and the receiver can pick out a desired transmitter’s signal from the others by suitably despreading the received signal. OCDMA networks were a popular research topic in the late 1980s and early 1990s, but they suffer from even more problems than PPS networks employing high-speed TDM. See [Sal89, SB89, PSF86, FV88] for a sampling of papers on this topic, and see [Gre93] for a good overview. Problems 12.1 In the packet multiplexing illustrated in Figure 12.7, show that the delay encoun- tered by pulse i , i = 1 , 2 ,...,l , on passing through the k compression stages is ( 2 k i)(T τ) . Using the fact that the pulses are separated by time T at the input, now show that pulse i occurs at the output at time ( 2 k 1 )(T τ) + (i 1 . Thus the pulses are separated by a time interval of
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This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

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