Elongation characteristics of an optical fiber loop reflectors are investigated theoretically and experimentally considering fiber birefringence of the loop. Due to the birefringence formed from elliptical deformation and/or unsymmetrical stress (for example, bending) and/or twisting, the reflectivity and elongation characteristics would have some changes. During elongating process of drawing a fused taped coupler, the transmitted power of a fiber loop reflector showed some interesting characteristics as we were twisting the fiber. Even we did not twist the fiber, due to the elliptical deformation and unsymmetrical stress, the envelope of the elongation curve displayed some unsymmetrical modulation characteristics. These characteristics were more evident when the length of the fiber was longer. Using coupled-mode theory, all these experimental results were well explained.
The saturation effect of EDFA on frequency filtering characteristics of active fiber ring resonators is studied theoretically and experimentally in this paper. When input signal power is large enough, it would enter the saturation regime and lower EDFA gain, thus, the finesse of active fiber ring resonator descends as the same when lower pump power is injected, all of which are confirmed by comparing the output signal spectrums with different input signal power and different pump power in our experiments. By using the atom rate equations of EDFA and the multi-light interference theory, the experiment results are well explained. On considering this EDFA saturation effect, the optimization of active fiber ring resonator filter is also discussed. To obtain both narrower linewidth light and larger output power, one should use input coupler with small coupling ratio and output coupler with large coupling ratio to construct an active fiber ring resonator filter, making sure that saturation effect of EDFA can not occur.
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