A fiber holder is provided which includes first and second holder plates having first and second main surfaces, respectively. The first holder plate includes a first channel insert including a first fiber channel configured to receive a fiber therein, and a first insert channel disposed on the first main surface such that the first insert channel extends through a length of the first main surface and is configured to receive the first channel insert. The second holder plate includes a second channel insert including a second fiber channel configured to receive the fiber therein, and a second insert channel disposed on the second main surface such that the second insert channel extends through a length of the second main surface and is configured to receive the second channel insert. The first and second channel inserts are disposed within the first and second insert channels, respectively.