Optics: measuring and testing – Photometers – Photoelectric
Patent
1994-09-21
1996-07-09
Gonzalez, Frank
Optics: measuring and testing
Photometers
Photoelectric
356226, 356227, 359110, G01J 142
Patent
active
055349960
ABSTRACT:
A measurement apparatus and method for evaluating a light emitting device automatically measures a carrier-noise ratio, an optical modulation index, and a relative intensity noise of the light emitting device, and graphically displays the resulted data. The measurement apparatus includes a photo detector for converting an input light signal from the light emitting device to an electric current, a DC amplifier for amplifying a DC component of the electric current, a first analog-to-digital convertor for digitizing the output of the DC amplifier, a RF amplifier for amplifying a high frequency component of the electric current, a detector for detecting the output of the RF amplifier, a second analog-to-digital convertor for digitizing the output of the detector, a controller for controlling sequences of automatic measuring operations, a display device for displaying the characteristics of the light emitting device.
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Bendo Masatoshi
Mori Hiroshi
Advantest Corporation
Eisenberg Jason D.
Gonzalez Frank
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