Mechanical splicing permanently connects the two optical fibers with a short mechanical splice approx. 6 cm long and 1 cm in diameter. This will mechanically join two bare strands after they have been properly aligned. The procedures apply to both single optical. bers to be terminated from cable to cable or from cable to pigtail assemblies. 1 High quality fiber optic splices are required to ensure the quality and integrity of communications transmission network which utilizes fiber optic cable as part of its path. 2 Procedures indicated in this standard in conjunction with fiber optic cable manufacturer's recommendations for. With the building of Fiber- To-The Home (FTTH) networks and a general move from long-haul to access networks the average installed length of optical fiber cable is decreasing. Fusion splicing is most widely used as it provides for the lowest loss and least reflectance, as well as providing the most reliable joint.