Method for detecting quality of optical fiber and related device thereof

The invention discloses a method for detecting the quality of an optical fiber and a related device thereof, which are applied to the field of communication. The method comprises the following steps: a first communication device obtains a first optical power difference value and a second optical power difference value; wherein the first optical power difference value is an optical power change value of the light beam of the first wavelength transmitted by the receiving optical fiber in the first time period, and the second optical power difference value is an optical power change value of the light beam of the second wavelength transmitted by the receiving optical fiber in the second time period. And the first communication device determines the bending radius of the optical fiber and/or the bending length of the optical fiber based on the first optical power difference value and the second optical power difference value. The first communication device determines the bending amount of the optical fiber or whether the optical fiber has optical fiber eavesdropping based on the bending radius and/or the bending length so as to obtain the bending amount of the current to-be-detected optical fiber or determine whether the current optical fiber has optical fiber eavesdropping so as to detect the specific damage degree of the optical fiber quality. And additional hardware is not needed, so that the cost is saved.