Related Experiment Video
Updated: Nov 3, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Complex amplitude estimation of a monochromatic radio-frequency signal using frequency downconversion via direct
Abstract:
We propose an estimation scheme for a radio-frequency (RF) signal based on microwave and millimeter-wave photonics to avoid degradation of measurement accuracy due to RF devices used in signal detection. In this scheme, two-parallel optical phase modulation and low-pass optical direct detection of the interference signal are utilized, enabling the transfer of complex amplitudes of the RF signal into the interfered lightwave. A 10 GHz RF signal is successfully evaluated from the 20 kHz oscillation signal obtained from the direct detection. This scheme can be applied to signals in the millimeter-wave region because it does not require wide bandwidth detection and optical-domain filtering by using a special optical filter.
Related Concept Videos
Aliasing
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
Reconstruction of Signal using Interpolation
Upsampling
Interference: Path Lengths
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Electronic Distance Measuring Instruments
Properties of Fourier Transform I
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...

