| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程學系 === 84 === In an optical star coupler network, all stations are connec-
ted via a passive star coupler. Wavelength division
Multiplexing (WDM) technology has be used to increase the total
bandwidth. WDM is defined to divide the optical bandwidth of
the fiber into different wavelength channels. Two moduses,
single-hop and multi-hop, are explored in WDM lightwave
networks. In the multi- hop modus, their data packets need to
go through zero or more intermediate nodes before reaching
destinations, while data packets are sent from their sources
directly to their destinations in the single-hop modus. The
media access protocol is used to schedule data transmissions on
multiple channels for the single-hop modus. This paper proposes
a media-access scheme for single-hop modus in all-optical local
networks. The network architecture is called CC-FTTT-FRFR, in
which each station is equipped with a fixed-tuned transmitter,
a tunable transmitter and two fixed- tuned receivers. We
combine the time division multiplexing (TDM) and dynamic
allocation scheme (DAS), and allow that packet sizes are
variable. Two scheduling algorithms provide lower message delay
for small and variable-size messages. First algorithm is called
Variable-Length Dynamic Allocation Scheme (VLSDAS), in which
tuning time is not considered for transmitters. Second
algorithm is called Variable-Length Dynamic Allocation Scheme
with Tuning Delay (VLDASTD), in which tuning time is considered
for transmitters. We conduct the simulations for these
protocols in terms of average message delay. Results indicate
that these protocols exhibit lower average message delay under
small and variable-size message transmissions.
|
|---|
