Abstract:
In an optical fiber light source a section of multimode fiber (51) is interposed between an energizing laser (e.g., a diode laser (49)) and a single mode fiber active medium (43). In a preferred embodiment the single mode fiber active medium is surrounded by a multimode cladding (45) coupled to the multimode fiber. The source may serve as a pump laser for a fiber amplifier (30) or as an amplified spontaneous emission source. Arrangements for coupling several energizing lasers to the active medium are also described.
Abstract:
The disclosed fiber Raman device (10) comprises means for coupling pump radiation of a first wavelength λ 1 and a second wavelength λ 2 into a length of silica-based fiber (12), with λ 1 being different from λ 2 , and with both of λ 1 and λ 2 being less than an output radiation λ 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 λ 1 and λ 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.
Abstract:
In an optical fiber light source a section of multimode fiber (51) is interposed between an energizing laser (e.g., a diode laser (49)) and a single mode fiber active medium (43). In a preferred embodiment the single mode fiber active medium is surrounded by a multimode cladding (45) coupled to the multimode fiber. The source may serve as a pump laser for a fiber amplifier (30) or as an amplified spontaneous emission source. Arrangements for coupling several energizing lasers to the active medium are also described.
Abstract:
The disclosed fiber Raman device (10) comprises means for coupling pump radiation of a first wavelength λ 1 and a second wavelength λ 2 into a length of silica-based fiber (12), with λ 1 being different from λ 2 , and with both of λ 1 and λ 2 being less than an output radiation λ 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 λ 1 and λ 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.