| 摘要 |
<p>The disclosed fiber Raman device (10) comprises means for coupling pump radiation of a first wavelength lambda 1 and a second wavelength lambda 2 into a length of silica-based fiber (12), with lambda 1 being different from lambda 2, and with both of lambda 1 and lambda 2 being less than an output radiation lambda 0 of the fiber Raman device (10). The Raman device (10) further comprises at least a first and a second wavelength-selective element (13,141) 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 lambda 1 and lambda 2 is off resonance. Exemplarily, the Raman device (10) 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. <IMAGE></p> |
