Measurement of Active Optical Fibers

Contribution of different factors in heat production in Yb3+-doped fiber laser: a review

“…For the measurement, white light is often used as the broadband source. 23 The measurement of very high attenuation in optical fibers requires the handling of correspondingly short fiber samples. Fluorescence properties cause challenges in measuring the true value of attenuation in the doped optical fibers.…”

“…24 Various techniques are proposed to measure the attenuation in doped fiber optics, for example, the conventional cut-back method can measure Rayleigh loss besides absorption from the ground state. 23 So, in the conventional cut-back method, the absorption cross-section must be evaluated by the direct method. 25 Double or triple cut back can also characterize the main doped fiber parameters simultaneously using pseudoparameters.…”

“…For the Gaussian pulse shape with the V number in the range in the range of 0.8 to 2.8, the experimental relation approximate of the spot size in the doped fiber is used as follows: 21 E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 5 ; 1 1 6 ; 1 1 3 α p and α l are background losses at the pump and laser wavelength, respectively. α PD−p and α PD−l are PD losses at the pump and laser wavelength, respectively, 23,57 for which conventional FL is not considered in the rate equations. The PD loss coefficient depends on the dopant concentration and is determined as…”