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 which splits a wavelength-division multiplexed optical signal into a plurality of wavelength bands;
a fixed dispersion compensating unit making compensation for residual dispersion for split wavelength-division multiplexed optical signals; and
an interleaving unit, which is arranged at a stage before said band splitting unit, which separates the wavelength-division multiplexed optical signal into odd-numbered channels and even-numbered channels, and converts 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 an 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. A chromatic dispersion compensating apparatus for use in a wavelength-division multiplexed optical transmission system, comprising:
an interleaving unit, which is arranged at a stage before a variable dispersion compensating unit, which separates the wavelength-division multiplexed optical signal into odd-numbered channels and even-numbered channels, and converts the wavelength-division multiplexed optical signal into a plurality of optical signals whose channel intervals are widened;
the variable dispersion compensating unit which makes dispersion compensation simultaneously for a part of a wavelength multiplexed optical signal;
an optical splitting unit which splits the wavelength multiplexed optical signal; and
a fixed dispersion compensating unit which makes compensation for residual dispersion for an optical signal of each split channel.
6. The chromatic dispersion compensating apparatus according to claim 5 , wherein
said optical splitting unit splits the wavelength-division multiplexed optical signal into a plurality of wavelength bands.
7. The chromatic dispersion compensating apparatus according to claim 5 , wherein
said optical splitting unit splits the wavelength multiplexed optical signal into optical signals of respective channels.
8. The chromatic dispersion compensating apparatus according to claim 5 , is arranged within an optical receiver.
9. The chromatic dispersion compensating apparatus according to claim 5 , is arranged within an inline amplifier.
10. The chromatic dispersion compensating apparatus according to claim 5 , wherein
the inline dispersion compensation makes 105- to 120-percent compensation for chromatic dispersion that a received wavelength multiplexed optical signal undergoes.
11. A chromatic dispersion compensating apparatus for use in a wavelength multiplexed optical transmission system, comprising:
a band splitting unit splitting a wavelength-division multiplexed optical signal into a plurality of wavelength bands;
a dispersion compensating unit reducing a residual dispersion difference between bands for respective split wavelength bands, wherein said dispersion compensating unit is a fixed dispersion compensator; and
an interleaving unit, which is arranged at a stage before said band splitting unit, which separates the wavelength-division multiplexed optical signal into odd-numbered channels and even-numbered channels, and converts the wavelength-division multiplexed optical signal into a plurality of optical signals whose channel intervals are widened.