Suppression of pump-to-Stokes relative intensity noise transfer in Raman fiber laser by injection of modulated signal |
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Authors: | Yingwu Zhou Guoyong Sun |
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Affiliation: | a Department of Physics, Minjiang University, Fuzhou 350108, People's Republic of China b Department of Physics, Shantou University, Shantou, Guangdong 515063, China |
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Abstract: | A feasible approach is theoretically demonstrated that suppresses the relative intensity noise (RIN) transfer from pump sources to the proposed Raman fiber laser (RFL) output at the first-order Stokes line. The technique is accomplished by injecting a modulated signal at second-order Stokes shift from the pump wavelength according to the monitored RFL output, which indirectly consumes the pump power fluctuations and results in suppression of the RIN transfer to the RFL output. With the RFL used as a pump source for co-pumped Raman fiber amplifiers, further calculation results show that the Q-factor penalty due to RIN transfer can be dramatically reduced. |
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Keywords: | Raman fiber laser Raman fiber amplifier Relative intensity noise Signal modulation |
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