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Electronic excitation energy transfer between donor and acceptor chromophores attached to a polymer chain is widely used as a tool for studying the structure of polymers [1, 2]. The time dependence of the donor and acceptor fluorescence after pulsed excitation can be related to the interchromophore distance via the rate of the Förster energy transfer [3]. These experiments are usually carried out in very diluted solutions in which energy transfer between different polymer molecules negligible. It is clear that intermolecular energy transfer cannot be neglected at moderate polymer concentra-tions. The interpretation of experimental results obtained for such systems appears to be a much more complex problem requiring the many-body problem of excitation transport to be solved [1, 4]