We propose a simple all-fiber solution for coherent beam combining of Er-doped fiber amplifiers. This method, which we believe to be a new method, employs the effect of refractive index changes in Yb-doped fibers induced at $\sim 1.55\mu \text{m}$ by optical pumping at $\sim 980\text{\hspace{0.17em} nm}$ , which is performed for an active phase control in the fiber configuration. An algorithm based on population inversion in a two-level system supports the straightforward implementation of the effect into a feedback loop. Combining two 500 mW Er-doped amplifiers in a single-mode fiber is successfully demonstrated with control by $\sim 120\text{\hspace{0.17em} mW}$ laser diode. The method is shown to operate against the acoustic phase noise within the range of $\sim \pi \text{\hspace{0.17em} rad}$ and with a rate of $\sim 2.6\pi \text{\hspace{0.17em} rad}/\text{ms}$ that potentially serves combining of at least 50 amplifiers similar to those used in practical work.