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The chirp parameter alpha of an electroabsorption Wannier-Stark modulator is measured for the first time, with a new, simple and accurate method. It varies widely from positive to negative values with applied bias. It is shown that a newly-introduced effective chirp parameter is zero as confirmed in a transmission experiment at 10 Gbit/s in a standard fibre.<<ETX>>
A 2/sup 9/-1 pseudorandom-binary-sequence soliton signal has been transmitted experimentally over one million km for the first time with no degradation in the bit error rates. The synchronous modulator was driven by a timing clock signal extracted from the transmitting data signal. These results mean that it is possible to send soliton data signals over unlimited distances through the use of soliton...
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