Chromatic dispersion compensating apparatus
In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.
1. A chromatic dispersion compensating apparatus for use in a wavelength-division multiplexed optical transmission system, comprising:
a band splitting unit splitting a wavelength-division multiplexed optical signal into a plurality of wavelength bands, each wavelength band of the plurality of wavelength bands having a continuous wavelength band;
a variable dispersion compensating unit making compensation simultaneously for split wavelength multiplexed optical signals; and
an interleaving unit, which is arranged at a stage before said band splitting unit, separating the wavelength-division multiplexed optical signal, and converting the wavelength-division multiplexed optical signal into a plurality of optical signals whose channel intervals are widened.
2. The chromatic dispersion compensating apparatus according to claim 1 , is arranged within a optical receiver.
3. The chromatic dispersion compensating apparatus according to claim 1 , is arranged within an inline amplifier.
4. The chromatic dispersion compensating apparatus according to claim 1 , wherein the inline dispersion compensation makes 105- to 120-percent compensation for chromatic dispersion that a received wavelength multiplexed optical signal undergoes.
5. The chromatic dispersion compensating apparatus according to claim 1 , further comprising a band combining filter unit combining compensated optical signals from said variable dispersion compensating unit.
6. The chromatic dispersion compensating apparatus according to claim 1 , further comprising an optical attenuator attenuating the compensated optical signals from said variable dispersion compensating unit.
7. A chromatic dispersion compensating apparatus for use in a wavelength-division multiplexed optical transmission system, comprising:
an interleaving unit separating the wavelength-division multiplexed optical signal, and converting the wavelength-division multiplexed optical signal into a plurality of optical signals whose channel spacing is enlarged;
a plurality of band splitting units splitting a plurality of optical signals whose channel spacing is enlarged into a plurality of wavelength bands, each wavelength band of the plurality of wavelength bands has a continuous wavelength band;
a plurality of combining interleaver units combining the wavelength bands of the plurality of wavelengths bands; and
a plurality of variable dispersion compensating units making compensation simultaneously for split wavelength multiplexed optical signals.
8. A chromatic dispersion compensating apparatus for use in a wavelength-division multiplexed optical transmission system, comprising:
a plurality of band splitting units splitting a plurality of optical signals whose channel spacing is enlarged and outputting a plurality of wavelength bands, each wavelength band of the plurality of wavelength bands having a continuous wavelength band;
a plurality of combining interleaver units combining the wavelength bands of the plurality of wavelengths, the wavelength bands being of the same band; and
a plurality of variable dispersion compensating units making compensation simultaneously for split wavelength multiplexed optical signals.