Signal light processing apparatus, light transmission apparatus, wavelength selection switch, wavelength division multiplexing transmission system, and signal light processing method

A signal light processing apparatus comprising:

• a wavelength selection switch that divides an input wavelength-multiplexed signal light into a first signal light and a second signal light in accordance with a wavelength;
• and
• a dispersion compensator that compensates dispersion compensation on the first signal light divided by the wavelength selection switch,
• wherein the wavelength selection switch combines a signal light on which dispersion compensation is compensated by the dispersion compensator and the second signal light.

A wavelength selection switch comprising:

• a first input port and a second input port to which a signal light is input;
• a first output port and a second output port that output a signal light having at least a part of wavelengths included in a signal light input into the first input port or the second input port;
• a divider/combiner that divides a signal light input into the first input port or the second input port into signal lights of each wavelength and combines a plurality of incoming signal lights;
• a first reflection unit that reflects a signal light having a first wavelength, which is divided by the divider/combiner, among signal lights input into the first input port to the first output port via the divider/combiner, and reflects a signal light having a first wavelength, which is divided by the divider/combiner, among signal lights input into the second input port to the second output port via the divider/combiner, and
• a second reflection unit that reflects a signal light having a second wavelength, which is divided by the divider/combiner, among signal lights input into the first input port to the second output port via the divider/combiner.

A signal light processing method comprising:

• dividing an input wavelength-multiplexed signal light into signal lights of each wavelength and outputs the signal lights from a first output port or a second output port in accordance with wavelengths of the divided signal lights;
• compensating dispersion compensation on the signal light output from the first output port;
• and
• combining the signal light on which dispersion compensation is compensated and the signal light output from the second output port.

A signal light processing apparatus comprising:

• a processor;
• and
• a memory, wherein the processor executes:
• dividing an input wavelength-multiplexed signal light into signal lights of each wavelength and outputs the signal lights from a first output port or a second output port in accordance with wavelengths of the divided signal lights;
• compensating dispersion compensation on the signal light output from the first output port;
• and
• combining the signal light on which dispersion compensation is compensated and the signal light output from the second output port.

A signal light processing apparatus comprising:

• a processor;
• and
• a memory, wherein the processor executes:
• dividing an input wavelength-multiplexed signal light into a first signal light and a second signal light in accordance with a wavelength;
• and
• compensating dispersion compensation on the first signal light divided,
• wherein the dividing combines a signal light on which dispersion compensation is compensated and the second signal light.