Positionally independent application of an OTDR technique based

Details Positionally independent application of an OTDR technique based Positionally independent application of an OTDR technique based

1994-10-28

1996-10-29

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359173, 356 731, H04B 1008

Patent

active

055702171

ABSTRACT:
In a branched optical fibre network in which an optical signal (I) modulated with a data signal is distributed by a transmitter connected to the network, OTDR based on correlation is applied independently of position by uncoupling both a signal part (I.sub.1) of the distributed signal (I) in the forward direction and a signal part (R.sub.1) of the reflected signal (R) in the return direction at an arbitrarily chosen uncoupling point P in a fibre connection (46) of the network, detecting them and correlating them with one another. A device for performing such a positionally independent correlation OTDR is provided with uncoupling means (60) having a first signal output (68) and a second signal output (66), via which outputs the signal part (I.sub.1) and the signal part (R.sub.1), respectively, are fed to optical receivers (70 and 71). The signal parts received are detected by the receivers, demodulated and corresponding electrical signals are supplied to a correlator (78) which produces an OTDR signal for an OTDR imaging means (82).

REFERENCES:
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D. R. Anderson et al., "Synthetic Fiber Generator", Research Disclosure, No. 321, Jan. 1991, Emsworth, GB.
"Clip-On Coupler", Fiberoptic Product News, Apr. 1993.
I. Sankawa et al., "Fault Location Technique for In-Service Branched Optical Fiber Networks", IEEE Photonics Technology Letters, vol. 2, No. 10, Oct. 1990, pp. 766-768.

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