Optical wavelength multiplex transmission method and optical dispersion compensation method

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• a first optical amplifier amplifying the first optical signals, and
• a first dispersion compensator compensating dispersion of the amplified first optical signals and outputting the dispersion compensated first optical signals;
• and
• a second unit including
• a second optical amplifier amplifying the second optical signals;
• and
• a second dispersion compensator compensating dispersion of the amplified second optical signals and outputting the dispersion compensated second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• a first dispersion compensator compensating dispersion of the first optical signals;
• and
• a first optical amplifier amplifying the dispersion compensated first optical signals and outputting the amplified first optical signals;
• and
• a second unit including
• a second dispersion compensator compensating dispersion of the second optical signals, and
• a second optical amplifier amplifying the dispersion compensated second optical signals and outputting the amplified second optical signals.

A method comprising:

• wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• amplifying the first and second optical signals separately;
• and
• compensating dispersion of the amplified first and second optical signals separately to output the dispersion compensated first and second optical signals.

A method comprising:

• wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• compensating dispersion of the first and second optical signals separately;
• and
• amplifying the dispersion compensated first and second optical signals separately to output the amplified first and second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• an optical amplifier amplifying the first optical signals,
• a dispersion compensator compensating dispersion of the amplified first optical signals and outputting the dispersion compensated first optical signals, and
• an optical amplifier amplifying the dispersion compensated first optical signals and outputting the amplified dispersion compensated first optical signals;
• and
• a second unit including
• an optical amplifier amplifying the second optical signals,
• a dispersion compensator compensating dispersion of the amplified second optical signals and outputting the dispersion compensated second optical signals, and
• an optical amplifier amplifying the dispersion compensated second optical signals and outputting the amplified dispersion compensated second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• an optical amplifier amplifying the first optical signals,
• a dispersion compensator compensating dispersion of the amplified first optical signals and outputting the dispersion compensated first optical signals, and
• an optical amplifier amplifying the dispersion compensated first optical signals and outputting the amplified dispersion compensated first optical signals;
• and
• a second unit including
• an optical amplifier amplifying the second optical signals;
• and
• a dispersion compensator compensating dispersion of the amplified second optical signals and outputting the dispersion compensated second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• an optical amplifier amplifying the first optical signals,
• a dispersion compensator compensating dispersion of the amplified first optical signals and outputting the dispersion compensated first optical signals, and
• an optical amplifier amplifying the dispersion compensated first optical signals and outputting the amplified dispersion compensated first optical signals;
• and
• a second unit including
• a second dispersion compensator compensating dispersion of the second optical signals, and
• an optical amplifier amplifying the dispersion compensated second optical signals and outputting the amplified second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• a first unit including
• an optical amplifier amplifying the first optical signals, and
• a dispersion compensator compensating dispersion of the amplified first optical signals and outputting the dispersion compensated first optical signals;
• a second unit including
• a dispersion compensator compensating dispersion of the second optical signals, and
• an optical amplifier amplifying the dispersion compensated second optical signals and outputting the amplified second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• first means for processing the first optical signals;
• and
• second means for processing the second optical signals.

An apparatus comprising:

• an optical demultiplexer wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• first means for processing the first optical signals and for outputting the processed first optical signals;
• second means for processing the second optical signals and for outputting the processed second optical signals;
• and
• an optical multiplexer wavelength multiplexing the processed first optical signals and the processed second optical signals together.

A method comprising:

• wavelength demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• processing the first optical signals;
• and
• processing the second optical signals.

A method comprising:

• wavelength-demultiplexing a wavelength-division-multiplexed optical signal including a plurality of optical signals having different wavelengths into first optical signals and second optical signals of which wavelengths are longer than wavelengths of the first optical signals;
• processing the first optical signals to output the processed first optical signals;
• processing the second optical signals to output the processed second optical signals;
• and
• wavelength-multiplexing the processed first optical signals and the processed second optical signals together.