Detection and predetermination calculational method for rapid variation light power

An optical power and fast technology, applied in the direction of using electrical radiation detectors for photometry, etc., can solve the problems of narrow TIA circuit bandwidth, large circuit gain, ignoring optical power detection, etc., to suppress gain overshoot or undershoot. , The speed of calculation output is fast, and the effect of good application prospects
CN101634590AActive Publication Date: 2010-01-27GUANGXUN SCI & TECH WUHAN
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUANGXUN SCI & TECH WUHAN
Publication Date
2010-01-27

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Abstract

A detection and predetermination calculational method for rapid variation light power comprises steps of: respectively obtaining characteristic parameters and a threshold value of an instant slope ratio of all gears of a TIA circuit which are stored in a parameter table; calculating the instant slope ratio value of output signals of the TIA circuit in real time, and comparing the real time instant slope ratio value and the threshold value of instant slope ratio; when input light signal varies quickly, determining the beginning power value of input light variation, and calculating the real variable quantity of the input light power according to the instant slope ratio of the output signals of the TIA circuit; adding the beginning light power of input light variation and input light power variable quantity obtained by predetermination calculation to obtain determination light power when input light rapid varies to serve as the real instant power of the input light, comparing the light power value obtained by predetermination and the light power value obtained according to the output signals of the TIA circuit, finishing the predetermination calculation when the predetermined light power value and the light power value are closer, using the light power value as the real instant power of the input light. The method greatly speeds up light power detection speed and can accurately display the light power value of fast variation.
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Description

technical field

[0001] The invention relates to detection and prediction calculation of optical power. In particular, it relates to a method for detecting and predicting calculation of fast-changing optical power that can accurately predict and calculate the changing target power at the instant when the input light changes rapidly. Background technique

[0002] In optical communication systems, there are generally two types of optical power detection circuits: one is a transconductance amplifier circuit composed of a logarithmic operational amplifier. The advantage of this circuit is that it has a wide dynamic range. The detection sensitivity of variable signals is low, which is not conducive to the detection of rapidly changing optical power; the other is a TIA (Transimpedance Amplifier, transimpedance amplification) circuit using a linear operational amplifier. The output of the TIA circuit is in a linear relationship. It is easier to detect the rapid change of the input ...

Claims

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