Abstract: The present disclosure provides an optical device including a collimator array, a plug housing, and a detachable coupling means. The collimator array includes a fiber array and a collimator lens array. The fiber array includes fibers, a plate holder, and a groove. The plate holder carries the fibers. The groove is on a top face of the plate holder and parallel along a longitudinal direction of the fibers. The plug housing is fixated to the collimator array in part by engagement of a strip protrusion at a bottom face of the plug housing to the groove on the top face of the plate holder. The detachable coupling means is at a side surface of the plug housing and configured to mechanically couple the plug housing to a corresponding receptacle housing external to the optical device.