Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1997-03-12
1998-09-22
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2184
Patent
active
058122532
ABSTRACT:
A measuring apparatus and a method of operation are presented for rapid and accurate determination of the performance parameters of an optical fiber amplifier. The apparatus primarily includes an optical fiber path 2 having an acousto-optical modulator 3 for modulating reference light and an optical switching device 11 for enabling to bypass the modulator 3, to supply reference light to an optical coupler 5 which divides the reference light into first and second signals. The measuring technique involves: a first step of bypassing the modulator 3 to measure the power level of the second optical signal with an optical powermeter 10; a second step of measuring the power level of the modulated reference light, and then selecting a second optical signal with an optical switch 7 for modulation in another acousto-optical modulator 8, and measuring its output signal; a third step of bypassing the modulator 3 so as to measure the output signal from the modulator 8 with an optical spectrum analyzer 9; a fourth step of measuring the power level of the modulated reference light; and a fifth step of computing a difference between the measured results in steps 1 and 3 to obtain an adjustment value for the reference light, and computing a difference between the measured results in steps 2 and 4 to obtain an adjustment value for the modulated light.
REFERENCES:
patent: 5521751 (1996-05-01), Aida et al.
Ando Electric Co. Ltd.
McGraw Vincent P.
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