This paper deals with the effect of magnetic field of a straight Conductor on data transmission in optical fiber communication systems. A proposed method utilized to measure the stability of system performance. The experimental and simulation results demonstrated that the system instability increases effectively under the effect of external Magnetic Field. The experimental results show linear dependence of the output power fluctuation with the low magnetic field. Furthermore, for higher magnetic field values the maximum probability values of the output power close to110%. Moreover, high values of Q-factor (≥ 6) indicate a lower rate of received signal loss and the effect of the external magnetic field can be neglected in common applications.

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