Optical spectrum analyzer having adjustable sensitivity

Details Optical spectrum analyzer having adjustable sensitivity Optical spectrum analyzer having adjustable sensitivity

1991-11-06

1993-01-05

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With synchronized spectrum repetitive scanning

356328, G01J 302, G01J 318

Patent

active

051775603

ABSTRACT:
An optical spectrum analyzer is provided with a user selectable sensitivity. Required operating parameters are set in response to user selection of sensitivity to permit measurement of an input light beam at the selected sensitivity. Setting the required parameters includes setting a required gain of a video channel to permit measurement of a specified maximum light signal and to provide the selected sensitivity, setting a required video bandwidth of the video channel to provide the selected sensitivity at the required gain of the video channel and setting a sweep rate to provide the selected sensitivity at the required video bandwidth. When the normal bandwidth of the video channel is not adequate to provide the selected sensitivity, the electrical signal is passed through a digital filter having a filter coefficient set to provide the required video bandwidth. A peak detector is incorporated in the video channel to accurately measure signal amplitudes in a fast scanning condition.

REFERENCES:
patent: 4169678 (1979-10-01), Inoue et al.
patent: 4180327 (1979-12-01), Maeda et al.
patent: 4330207 (1982-05-01), Nogami et al.

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