Low reflectance optical fiber mirrors in the continuous length of the single mode fiber were fabricated using mechanical splices and pieces of fiber coated with TiO₂ dielectric film at the cleaved end. When fiber mirrors of refelctance of about 1% were produced, the insertion loss ranged from 0.055dB to 0.3dB and the average insertion loss was 0.15 dB. These mirrors could be produced easy in the field.