Pulse laser signal-to-noise ratio detection device

Abstract

Disclosed is a pulse laser signal-to-noise ratio detection device, which includes a first fiber optic splitter, a delay fiber, an adjustable delayer, a polarization controller, a pulse bias generator,a dual-stage electrooptic intensity modulator, a second fiber optic splitter, a trigger unit, an attenuation device, a delay device, a signal gain device, a multi-optical path multiplexing device, aphotoelectric detection device, an electric signal processing device and the like. The pulse laser signal-to-noise ratio detection device in the invention detects the background noise intensity of thelaser output pulse by using the first fiber optic splitter, the delay fiber, the adjustable delayer, the polarization controller, the pulse bias generator, the dual-stage intensity modulator, the second fiber optic splitter, the trigger unit and the signal gain device, detects the signal intensity of the main peak of the pulse at the same time by using the first fiber optic splitter, the second fiber optic splitter, the attenuation device and the delay device, and obtains the signal-to-noise ratio. The detection range of the signal-to-noise ratio of the device can reach 50dB with an accuracyof 1dB. The device has the characteristics of easy operation, high test accuracy, good reliability and the like.

Description

technical field [0001] The invention belongs to pulse laser technology, in particular to a pulse laser signal-to-noise ratio detection device, which is mainly used for processing optical pulse signals to detect the main peak and background noise intensity of the laser pulse signal, and obtain the signal-to-noise ratio. The invention is especially suitable for detecting the signal-to-noise ratio of a nanosecond single-pulse laser signal with a large dynamic range. Background technique [0002] Pulse lasers mainly include solid-state lasers and fiber lasers. The signal-to-noise ratio is an important technical indicator, which reflects the technical level of the laser system. At present, there are two main detection methods for the signal-to-noise ratio of nanosecond-level pulsed lasers: one is to use high-speed oscilloscopes and photodiodes for direct detection of photoelectric signal conversion, and the detection range can reach about ten dB; the other is to use multiple opti...

AI Technical Summary

Problems solved by technology

The US patent can detect the signal-to-noise ratio of a known continuous pulse, but the detection range of the signal-to-noise ratio cannot exceed 30dB, because when the signal light is directly sent to the photodetector, the signal light is very close to what the photodetector can detect the saturation of

Images