Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1994-09-06
1996-05-07
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356346, G01B 902
Patent
active
055151663
ABSTRACT:
An optical FM characteristics measurement apparatus for measuring the light signal from a laser diode is capable of automatically and precisely determining a frequency discriminating point of the interferometer and maintain the discriminating point during the measurement. The measurement apparatus can distinguish an intensity modulation component from a frequency modulation component in the light signal from the laser diode, therefore, it can improve measurement accuracy and operation efficiency. The measurement apparatus has an interferometer control unit for controlling the interferometer used as an optical frequency discriminator, a processing unit for calculating a discriminating point using output of a photodiode and for storing its value, switches for detecting an increasing point or a decreasing point of the interferometer output based on the discriminating point, a switch for monitoring peak value of the interferometer in real time, and a network analyzer which is capable of analyzing the incoming signal in terms of amplitude and phase.
REFERENCES:
patent: 5229811 (1993-07-01), Hattori et al.
Kimura Eiji
Mori Hiroshi
Advantest Corporation
Kim Robert
Turner Samuel A.
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