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

047997907

ABSTRACT:
A system for measuring a chromatic dispersion of an optical fiber has a light signal transmitter and a light signal receiver. The transmitter has a modulation signal generating circuit for generating at least one modulation signal having a predetermined frequency, and synchronizing signal generating circuit for generating a synchronizing signal having a predetermined frequency. First adding circuit is provided for adding the synchronizing signal generated by the synchronizing signal generating circuit to the modulation signal generated by the modulation signal generatig circuit. The light signal receiver has first photoelectric converter for converting the reference optical signal into a reference electrical signal added with the synchronizing signal and second photoelectric converter for converting the measurement optical signal into a measurement electrical signal added with the synchronizing signal. The receiver also has a synchronizing signal regenerating circuit for generating a regenerated synchronizing signal at a predetermined timing, and local signal generating circuit for generating at least one local signal having a predetermined frequency. Second adding circuit is provided for adding the regenerated synchronizing signal to the local signal from the local signal generating circuit. Further, a timing signal obtaining circuit is provided for separating the synchronizing signal from the reference electrical signal added with the synchronizing signal from the first photoelectric converter to obtain a timing signal serving as the synchronizing signal, in order to provide the predetermined timing to the synchronizing signal regenerating means.

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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