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23 February 2009 Analysis of ytterbium-doped gain guided and index antiguided fiber amplifier
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Gain guided and index antiguided fiber, having a negative refractive index step from the cladding to the core combined with an adequate gain effect, can deliver robust single mode operation with a large mode area. In this paper, we introduce this new concept of gain guided and index antiguided fiber into fiber amplifier, and evaluate the gain characteristics by solving propagation rate equations on the Yb3+ doped fiber, where the core has a radius of 50um, refractive index n0 = 1.58, and the index step Δn = -0.0045, concentration of ions 2.43×1026m-3, at the signal (975nm) and the pump (910nm) wavelength and a initial signal power 1μW. According to the function of gain versus fiber length, being obtained from the numerical computation, we can confirm that a properly designed gain guided and index antiguided fiber can provide highly efficient optical amplification with a short length, and revise the set of transcendental equations at optimal total gain effect and optimal fiber length on the case of gain guided and index antiguided fibers.
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Xiangru Wang and Qi Qiu "Analysis of ytterbium-doped gain guided and index antiguided fiber amplifier", Proc. SPIE 7278, Photonics and Optoelectronics Meetings (POEM) 2008: Fiber Optic Communication and Sensors, 72780C (23 February 2009);


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