Optical Homodyne Detection

Optical homodyne detection is a technique used in optics and telecommunications to measure weak light signals. It involves mixing the light signal with a reference light wave from the same source, called the "local oscillator." By comparing the two, it allows for precise measurement of the signal's phase and amplitude. This method enhances sensitivity and accuracy in detecting signals, making it valuable for applications like quantum communication and advanced imaging. Essentially, it’s like tuning into a specific frequency to clearly hear a faint sound amidst noise.