Polarization-independent wavelength converter and polarization-independent wavelength conversion method

摘要

A polarization-maintaining optical fiber having first and second polarization axes, each having a first end and a second end, orthogonal to each other and having different light propagation speeds, and signal light having an arbitrary polarization state And pump light having a polarization component parallel to the first polarization axis and a polarization component parallel to the second polarization axis, and receiving the signal light and the signal light and the pump light The signal light and the wavelength conversion so that the wavelength-converted light generated in the polarization-maintaining optical fiber by propagation is not affected by the group velocity difference between the first and second polarization axes. A group velocity difference elimination unit that allows light to pass through the polarization maintaining optical fiber.