S. Hinz et al., Optical NRZ 2 x 10Gbit/s polarisation division multiplex transmission withendless polarisation control driven by correlation signals, ELECTR LETT, 36(16), 2000, pp. 1402-1403
Polarisation division multiplexing enables existing trunk lines with limite
d amplification bandwidth to be upgraded. Endless polarisation tracking by
electro-optic polarisation transformers is demonstrated in the presence of
polarisation-dependent loss.