Abstract
In this paper, we show the influence of intrachannel crosstalk in an
optical switch network. The intrachannel crosstalk is mainly due to a signal
that is not sufficiently blocked by the optical switch. The signal has a
broadband spectrum and causes coherent crosstalk at the optical switching
node. We investigate analytically the relationship between the channel
isolation of the optical switching node that the optical switch network
comprises and the crosstalk penalty due to the broadband signal. We confirm
experimentally that the relationship is suited to the optical switch network
that emulates an optical cross-connect system. We also show experimentally
that it is important to use the optical switch with a high channel isolation
level in the entire range of the signal bandwidth in order to suppress the
impairment due to the crosstalk. We confirm that in a 50-GHz spaced system,
a 44-Gb/s return-to-zero differential quadrature phase-shift-keying signal
is sufficiently transmitted without a crosstalk penalty through 24 optical
switching nodes, comprising wavelength selective filters with a high channel
isolation level in the entire range of the signal
bandwidth.
© 2009 IEEE
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