G - Physics – 02 – B
Patent
G - Physics
02
B
88/98
G02B 27/10 (2006.01)
Patent
CA 1165605
D-23,460 METHOD AND APPARATUS FOR MEASURING THE INSERTION LOSS OF AN OPTICAL COMPONENT BY Arthur H. Fitch Abstract of Disclosure An integrating sphere converts an incident light beam into first and second light beams of the same radiant power. The first light beam is coupled through an optical component to a first radiometer. The second light beam is coupled directly to a second radiometer. The reading P1 on the first radiometer is a measure of the radiant power passed by the component. The reading P2 on the second radiometer is a measure of the radiant power applied to the component. The insertion loss of the component is 10 log P1/P2. In an alternate embodiment, the second light beam is passed through a variable optical attenuator prior to application to the second radiometer. When the attenuation is adjusted to provide the same readings on the radiometers, the decibel value of attenuation corresponds to the insertion loss of the component. In another embodiment having increased sensitivity, light having a fixed pulse repetition frequency is applied to the sphere. Light pulses passed by the component and attenuator are applied to associated ones of a pair of matched photodetectors providing signals that are sequentially applied to a lock-in amplifier, which is tuned to the pulse repetition frequency, for providing clear indications of radiant power incident on the photodetectors.
390637
Gte Automatic Electric Incorporated
R. William Wray & Associates
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