A device and method for testing the background light suppression ratio of an ultraviolet light communication receiver
A communication receiving and testing device technology, applied in transmission monitoring/testing/fault measurement systems, short-distance systems, free space transmission, etc., can solve the problems of test result errors, accuracy and reliability, and large fluctuations in spectral radiation, and achieve High modulation rate, accurate and reliable data
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Embodiment 1
[0031]The invention provides a background light suppression ratio test device for an ultraviolet communication receiver, which includes a 266nm / 325nm laser, an optical attenuator, an acousto-optic modulator, at least two diaphragms, a beam expander / collimator, and a function generator The 266nm / 325nm lasers respectively output lasers which are respectively attenuated by the optical attenuators, and are respectively incident on the acoustic light of the acousto-optic modulator at predetermined angles. The diffracted light is generated on the optical crystal, and the +1 or -1 order diffracted light is extracted by one of the apertures respectively; then the extracted diffracted beam is expanded and collimated by the beam expander / collimator respectively; 2. Trim the beam expanded / collimated laser spot respectively, use the calibrated detector and the lock-in amplifier respectively to obtain the optical power P of the standard modulated light, remove the detector and the lock-in a...
Embodiment 2
[0036] On the basis of the above embodiments, the present invention also provides a method for testing the background light suppression ratio of an ultraviolet communication receiver, which includes the following steps:
[0037] Step 1: After the 266nm / 325nm laser output laser light is attenuated by the optical attenuator, it is respectively incident on the acousto-optic crystal of the acousto-optic modulator at a predetermined angle to generate diffracted light, and one of the diaphragms is used to divide the +1 or - The first-order diffracted light is extracted;
[0038] Step 2: expand and collimate the extracted diffracted beams through beam expander / collimator mirrors;
[0039] Step 3: The second aperture trims the expanded / collimated laser spot respectively, and uses the calibrated detector and lock-in amplifier respectively to obtain the optical power P of the standard modulated light;
[0040] Step 4: Remove the detector and lock-in amplifier, put the receiver under te...
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