Apparatus for measuring the characteristics of an optical fiber

Details Apparatus for measuring the characteristics of an optical fiber Apparatus for measuring the characteristics of an optical fiber

2011-01-18

2011-01-18

Phan, Hanh (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S025000, C398S029000, C398S020000, C356S073100, C385S015000, C385S027000, C250S559040, C250S559080, C250S227140

Reexamination Certificate

active

07873273

ABSTRACT:
An apparatus for measuring the characteristics of an optical fiber is provided. An optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval which is equal to or shorter tan a life time of an acoustic wave in the optical fiber. A detector couples the coherent light with a Brillouin backscattered light which includes first and second Brillouin backscattered lights belonging to the first and second optical pulses respectively, thereby generating an optical signal. The detector further converts the optical signal into an electrical signal. A signal processor takes the sum of the electrical signal and a delay electrical signal which is delayed from the electrical signal by a delay time corresponding to the time interval, thereby generating an interference signal, and finds the characteristics of the optical fiber based on the interference signal.

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Li Che-Hien et al., “PPP-BOTDA method to achieve cm-order spatial resolution in Brillouin distributed measuring technique”, IEICE Technical Report, vol. 105, No. 242, OFT 2005-16, pp. 1-6 (2005).

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