Electro-optic Probe Frequency Fluctuation for Wide-band Signal Measurement

The patent replaces electrical signal processing circuits with optical processing methods. Specifically, it uses electro-optic crystals to convert electromagnetic wave signals into optical signals, which are then processed using optical components (optical modulators, optical filters, optical detectors) instead of high-bandwidth electrical circuits. This substitution achieves accurate measurement of wide-band signals while avoiding the cost and noise issues associated with high-bandwidth electrical circuitry.

The patent changes the frequency domain characteristics of the signal by converting wide-band electromagnetic wave signals into baseband or low-frequency optical signals through heterodyne detection and optical filtering. This parameter transformation allows the use of low-bandwidth, cost-effective optical components while maintaining measurement accuracy for the original wide-band electromagnetic signals.

The patent replaces electrical signal processing with optical processing to improve signal-to-noise ratio. Optical detection methods inherently provide better noise immunity for wide-band signals, as optical systems operate at higher frequencies with lower thermal noise and can utilize coherent detection techniques that enhance signal-to-noise performance compared to electrical circuits.

The patent introduces optical signals as an intermediary medium between the electromagnetic wave source and the detection system. The electromagnetic waves are first converted to optical signals via electro-optic interaction, then processed through the optical domain, and finally converted back to electrical signals for measurement. This intermediary optical domain provides noise isolation and signal enhancement benefits.