Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1996-10-10
1998-05-12
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
372 32, G01B 1116
Patent
active
057514135
ABSTRACT:
An apparatus for stabilizing the light output frequency of each laser diode for pulse light and probe light for measuring the distribution of strain, by controlling the change of the light output frequency of the laser diode due to external causes by input current of the laser diode. The apparatus is constructed such that the frequency variation of the laser diodes is detected to then generate a signal corresponding to the variation. Then, the signal is fed back to a temperature-current controller to be used as the input current signal of the laser diode.
REFERENCES:
patent: 4856011 (1989-08-01), Shimada et al.
patent: 5440207 (1995-08-01), Otsuka
Cho Jin Ki
Cho Young Ki
Chung Min Ho
Kim Ki Yeul
Lee Ho Bum
Korea Telecommunication Authority
McGraw Vincent P.
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