7Homodyne Detection and Heterodyne Detection of Light
In this chapter, we introduce the concept of homodyne detection and heterodyne detection in the framework of the classical electromagnetic wave theory of light. Optical homodyne detection and heterodyne detection are both adapted from radio frequency modulation technology. Differing from the standard photodetection, homodyne detection and heterodyne detection measure the frequency modulated radiation by mixing with radiation of a reference frequency, which is generated by a local oscillator. In homodyne detection, the reference frequency equals that of the input signal radiation; in heterodyne detection, the reference light takes a different frequency.
7.1 Optical Homodyne and Heterodyne ...
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