Fig. 1. Technical schematic diagram of IOFDR

Fig. 2. System structure diagram of IOFDR

Fig. 3. Experimental setup diagram of IOFDR

Fig. 4. Diagrams of IOFDR test resultsand enlargement of tail details. (a) Overall test drawing; (b) enlargement of tail details

Fig. 5. Detail diagrams of tail reflection peak. (a) The first time, the 30 cm long tail is subtracted; (b) the second time, the 20 cm long tail is subtracted; (c) the third time, the 20 cm long tail is subtracted

Fig. 6. Reflection peak tests at the first and second optical fibre connections. (a) 7 m long optical fibre jumper is accessed；(b) 3 m long optical fibre jumper is accessed

Fig. 7. Detail diagrams of reflection peaks under different conditions. (a) Starting end is not connected to optical fibre jumper cable; (b) starting end is connected to 3 m long optical fibre jumper cable

Fig. 8. Measurement results of IOFDR system by changing connection quality of LC connector three times