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References

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  1. B. L. Danielson, “Optical Time-Domain Reflectometer Specifications and Performance Testing,” Appl. Opt. 24, 2313 (1985).
    [CrossRef] [PubMed]
  2. M. Nazarathy, S. A. Newton, “Rayleigh Backscattering in Optical Fiber Recirculating Delay Lines,” Appl. Opt. 25, 1051 (1986).
    [CrossRef] [PubMed]

1986 (1)

1985 (1)

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Figures (4)

Fig. 1
Fig. 1

Backscatter signature for various values of the coupling coefficient κ. A propagation loss of 0.5-dB/loop transit is assumed. The vertical scale is referred to the initial backscatter level of a straight fiber having no 3-dB coupler to form a closed loop.

Fig. 2
Fig. 2

Experimental setup showing the recirculating delay line formed by splicing a delay spool to the pigtails of a directional coupler. The far end is index-matched to suppress reflections.

Fig. 3
Fig. 3

Experimental backscatter signature of a recirculating delay line with κ = 0.5. Pulses at each discontinuity are the result of a reflection at one of the splices. The origin of the vertical scale for this particular OTDR does not correspond to the initial backscatter. The estimated value of the first discontinuity (+2.94 dB) is displayed centered above the trace.

Fig. 4
Fig. 4

Paths of backscatter components detected at τ = T 0 + . Continuous line indicates the fiber strand, while dashed lines represent light paths: (a) Probe pulse is scattered halfway along the loop. (b) Probe pulse is scattered on entering loop. Backscattered signal makes loop transit. (c) Probe pulse makes loop transit and is backscattered as it reenters the loop.

Equations (3)

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d n = h ( n T 0 + ) h ( n T 0 - ) = 1 + n + 1 n κ 1 + n - 1 n κ - 1 ,
κ > n - 1 n + 1 .
d 1 = h ( T 0 + ) h ( T 0 - ) = 1 + 2 κ ( 1 - α c ) ,

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