packet switch architectures
Space switch fabric architecture is shown in figure. The switch consists of N
incoming and N out going fiber links, with n wavelengths running on each fiber
link. The switch is slotted, and the length of the slot is such that an optical
packet can be transmitted and propagated from an input port to an out put optical
The switch fabric consists of three
parts; optical packet encoder, space switch, and optical packet buffer. The optical
packet buffer works as follows. For each incoming fiber link, three is an optical
demultiplexer, which divides the incoming optical signal to different wavelengths.
Each wavelength is fed to a different tunable wavelength converter ( TWC), which
converts the wave length of the optical packet to a wavelength that is free at
the destination optical output fiber. Then, through the space switch fabric, the
optical packet can be switched to any of the N out put optical buffers.
the out put of a TWC is fed to a splitter, which distributes the same signal to
N different out put fibbers, one per out put fibber. The signal on each of these
out put fibbers goes through another splitter, which distributes this in to d+1
different out put fibbers, and each out put is connected through an optical gate
to one of the ODLs of the destination out put buffer. The optical packet is forwarded
to an ODL by appropriately keeping one optical gate open and closing the rest.
The information regarding to which wavelength of an incoming packet and the decision
as to which ODL of the destination out put buffer the packet will be switched
to is provided by the control unit, which ahs knowledge of the state of the entire
Each out put buffer is an optical
buffer implemented as follows. It consists of d+1 ODLs, numbered from 0 to d.
ODL1 delays optical packet for a fixed delay equal to 1 slots. ODL0 provides zero
delay, and a packet arriving at this ODL is simply transmitted out of the out
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