The fusion welding of single-mode fibre in the field requires readily portable equipment, and preferably single-man operation, implying that joint monitoring equipment should be contained in the welding machine. The essential preliminary to low-loss splicing is fibre cleaving to within 0.5 degrees of squareness. A hand-held cleaver that achieves this was designed. A fusion-welding machine which includes monitoring of core transmission by local light injection and detection was developed. The machine is microprocessor-controlled, so that fibre alignment and the welding process are automatic. The mean splice loss is 0.054dB. Field experience is also reported.
Patrick V. Andrews,
"Precision Cleaving And Fusion Welding Of Single Mode Fibres", Proc. SPIE 0522, Fibre Optics '85, (22 August 1985); doi: 10.1117/12.946216; https://doi.org/10.1117/12.946216