Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1989-05-04
1991-01-15
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2184, G01N 2141
Patent
active
049848844
ABSTRACT:
In measurement method of dispersion characteristics of an optical fiber, a laser for measurement connected to one end of the fiber and variable in output light wavelength and an oscillation for modulating a measurement light signal sent out from the laser are provided. The modulation frequency of the output from the oscillator is used as an reference electric signal. A measuring light signal obtained through the modulator 8 and transmitted through the fiber is converted into an measuring electric signal. And the characteristics is measured from the phase difference between the reference electric signal and the measuring electric signal, wherein an external modulator, an optical divider and a monitoring section are provided. The modulator modulates the measuring light signal sent out from the laser and having a narrow spectral linewidth. The divider divides the output light signal from the modulator, at a prescribed ratio. The measuring light signal obtained through the modulator is multiplexed with output light signal from a laser for monitoring by the section to generate a beat to measure the oscillation wavelength of the laser for measurement through optical heterodyne detection. And the characteristics is measured while the result of the measurement of the oscillation wavelength is compared with that of the measurement of the phase difference.
REFERENCES:
patent: 4710022 (1987-12-01), Soeda et al.
Horiuchi Yukio
Mochizuki Kiyohumi
Ryu Shiro
Kokusai Denshin Denwa Co. Ltd.
McGraw Vincent P.
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