03018/TUB: Method for Determining a Frequency Response
Currently the frequency analysis of optical signals relies on electro-optical modulators generating variable frequency signals. Subsequently, the response of a component to the signal can be detected and analyzed. Therefore, a complex calibration of the system is necessary. Additionally, the frequency range is confined to the range of the electro-optical modulator.
The invention described here provides a method for determining the frequency response of an electro-optical component, particularly the response of a light-generating or light-modulating component.
The electro-optical component is controlled by an electrical measuring signal with a measuring frequency in such a manner that an optical output signal is formed that is modulated by the measuring frequency. The measuring frequency is equal to an integral multiple of the pulse frequency plus a predetermined frequency offset. The pulses and the output signal are mixed, and a mixed product is detected whose modulation frequency corresponds to the predetermined frequency offset. The mixed product indicates the frequency response of the electro-optical component at the measuring frequency.
- Frequency response of the system can measured easily by autocorrelation
- No complex calibration of the measuring system is necessary
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