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Photonics Dictionary

injection locking

Injection locking, also known as injection-phase locking or injection-phase control, is a phenomenon in which a weak signal is synchronized with a stronger signal due to the injection of energy or information from the weaker signal into the stronger signal. 

In practical terms, injection locking occurs when a weak oscillator, such as a free-running oscillator or a voltage-controlled oscillator (VCO), is subjected to the influence of a stronger external signal, often referred to as the master oscillator. The master oscillator imposes its frequency and phase characteristics onto the weaker oscillator, effectively synchronizing their oscillations.

This phenomenon is commonly observed in various electronic devices, such as radio frequency (RF) circuits, where injection locking can be utilized for frequency synthesis, frequency multiplication, phase-locked loops (PLLs), and other applications requiring precise frequency and phase control. Additionally, injection locking has applications in fields such as telecommunications, radar systems, and optical communication.

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