Multi-clad Raman fiber amplifier
A Raman amplifier and multi-cladding technology, which is applied in the field of cascaded Raman fiber amplifiers, can solve the problems of limiting the brightness improvement of Raman fiber lasers, and achieve the effect of improving laser output brightness and output power
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Embodiment 1
[0019] see figure 1 , image 3 . figure 1 It is a schematic block diagram of the structure of the Raman amplifier embodiment 1 of the four-clad fiber of forward pumping, image 3 It is the specific form of the four-clad fiber in the present invention. 31 in the figure is the outermost cladding layer of the four-clad fiber, which is the coating layer, and 32 is the second cladding layer, which is generally pure SiO 2 , used to conduct pumping light, 33 and 34 are the third cladding layer and the fourth cladding layer doped with germanium, and 35 is the fiber core. The Raman amplifier mainly includes a multi-wavelength seed source 1, a pump source 2, a wavelength division multiplexer 3 and a four-clad gain fiber 4. The pump light provided by the pump source 2 and the signal light of different wavelengths provided by the multi-wavelength seed source 1 are respectively injected into different cladding layers and cores of the four-clad gain fiber 4 through the wavelength divisi...
Embodiment 2
[0021] see figure 2 , image 3 . figure 2 It is a schematic block diagram of the structure of the Raman amplifier embodiment 2 of the four-clad fiber of the back pump, image 3 It is the specific form of the four-clad fiber in the present invention. The difference between this embodiment and Embodiment 1 mainly lies in the back transmission of the pump light. The Raman amplifier mainly includes a multi-wavelength seed source 1 , wavelength division multiplexers 31 and 32 , a four-clad gain fiber 4 and a pump source 2 . The signal light of different wavelengths provided by the multi-wavelength seed source 1 enters the multi-clad gain fiber 4 through the wavelength division multiplexer 31, and the pump light is coupled into the multi-clad fiber 4 through the wavelength division multiplexer 32, and the back transmission is to the signal Light is amplified.
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