Article comprising a fiber raman device

This invention pertains to articles (e.g., an optical fiber communication system, or a light source or amplifier for such a system) that comprise an optical fiber Raman device. The disclosed fiber Raman device comprises means for coupling pump radiation of a first wavelength and a second wavelength into a length of silica-based fiber, with being different from , and with both of and being less than an output radiation of the fiber Raman device. The Raman device further comprises at least a first and a second wavelength-selective element disposed to provide one or more optical cavities for Raman shifting of light in the fiber. At least one of the optical cavities is selected such that at least one of and is off resonance. Exemplarily, the Raman device is a topologically linear or circular Raman laser or amplifier, and the wavelength selective element is a fiber Bragg grating or a WDM. The Raman device is advantageously used in an optical fiber communication system.