Wavelength conversion apparatus with improved efficiency, easy adjustability, and polarization insensitivity

摘要

A wavelength conversion apparatus has an optical amplifier (3), a wavelength converter (1), and an optical coupler (2) coupled to form an optical ring resonator. The optical amplifier supplies pump light. The wavelength converter generates converted light, either from the pump light alone or by interaction between the pump light and signal light supplied from a signal source. The optical coupler extracts the converted light. The optical ring resonator preferably includes a tunable optical bandpass filter (4) that defines the wavelength of the pump light. The optical coupler may also couple the signal light into the optical ring resonator, preferably through a polarization beam splitter and at least one polarization rotator, making the apparatus insensitive to the polarization of the signal light.