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Title:
INSTRUMENT MEASURING CHROMATIC DISPERSION IN OPTICAL FIBERS
Document Type and Number:
WIPO Patent Application WO2002016901
Kind Code:
A3
Abstract:
An instrument for measuring chromatic dispersion in optical fibers. The instrument comprises two independent modules, an optical source (2') and a receiver (4'). The optical source (2') comprises two pulse producing circuits: one driving a laser (35), which will be used as a timing reference, and the second driving a light emitting diode (LED) (34), emitting a short light pulse with a broad spectrum. The receiver (4') comprises a wavelength-selection element (46), which filters one or several wavelengths out of the LED spectrum, a photodetector (43) for detection of the laser pulse, a photon-counting detector (41) for detection of the filtered LED pulses, and a high-resolution timing circuit (42) for measuring the time delay between the laser pulse and the LED pulse. A preferred embodiment includes the wavelength-selection element (46) which is a series of Bragg gratings, thus selecting several fixed wavelengths.

Inventors:
BRENDEL JUERGEN (CH)
Application Number:
PCT/IB2001/001491
Publication Date:
June 27, 2002
Filing Date:
August 16, 2001
Export Citation:
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Assignee:
LUCIOL INSTR (CH)
BRENDEL JUERGEN (CH)
International Classes:
G01M11/00; (IPC1-7): G01M11/02
Foreign References:
US5189483A1993-02-23
EP0280329A21988-08-31
US5798853A1998-08-25
US4551019A1985-11-05
US5619320A1997-04-08
US4752125A1988-06-21
Other References:
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 10 17 November 2000 (2000-11-17)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02 26 February 1999 (1999-02-26)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 06 22 September 2000 (2000-09-22)
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