Optical Probing System with Multi-Signal Modulation and Demodulation

Abstract

An optical probing system transmits high-fidelity analog signals from a device under test (DUT) to a measurement instrument. The system receives a differential input signal and separates it into a high-frequency (HF) component and a low-frequency (LF) component. Each component is independently modulated using distinct analog modulation techniques and transmitted over separate optical fibers. The architecture maintains galvanic isolation between the input and output devices and enables independent transmission of signal portions optimized for bandwidth and accuracy. The signals are demodulated, delay-aligned, and recombined in the analog domain to produce a reconstructed full-bandwidth output.

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