Chromatic dispersion measuring system for optical fibers

Details Chromatic dispersion measuring system for optical fibers Chromatic dispersion measuring system for optical fibers

1988-02-24

1989-01-24

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

047997893

ABSTRACT:
A system for measuring a chromatic dispersion of an optical fiber based on a baseband phase comparison method has an optical signal transmitter, a reference optical fiber, a measurement optical fiber, and an optical signal receiver. The transmitter has n light sources for selectively generating, as measurement optical signals, optical signals having wavelengths corresponding to n wavelength points to be measured. One of the n light sources also serves to generate a reference optical signal. The transmitter further has an optical switch. The optical switch has n optical signal inputs arranged in correspondence with the n light sources, a measurement optical signal output, and a reference optical signal output. The optical switch commonly outputs, to the measurement optical signal output, the measurement optical signal which is output from the designated one of the n light sources and is selectively input to the n optical signal inputs. A half mirror is provided for outputting the reference optical signal generated by one of the n light sources to the reference signal output. The optical signal receiver is coupled to the reference optical fiber and the measurement optical fiber, and receives the reference optical signal from the reference optical fiber and the measurement optical signal from the measurement optical fiber, respectively, for measuring chromatic dispersion. The receiver includes a plurality of programmable optical attenuators.

REFERENCES:
patent: 4551019 (1985-11-01), Vella et al.
The Paper 2188 of 1984 All National Meeting of Electronics and Communications Engineers of Japan, entitled "Chromatic Dispersion Measurement for Singlemode Fiber", Tanaka & Kitayama.

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