System and method for testing point source transmittance of optical device

Abstract

The invention relates to a system and a method for testing the transmittance of a point source of an optical device. A collimator is fixed at one end of an X-axis of a support structure of the system,a two-dimensional rotary disc is mounted at the other end of the X-axis of the support structure, and a photoelectric theodolite and a to-be-measured optical device are mounted on the two-dimensionalrotary disc. The testing method comprises steps of adjusting a two-dimensional rotary disc to enable an optical axis of an optical device to be parallel to collimator beams, and measuring an opticalpower value at an entrance pupil of the optical device; adjusting the attenuation amount of an optical attenuator; adjusting the photoelectric theodolite to enable the center of the flat-topped optical fiber in the field of view of the telescope to be located in the center of a cross wire; the photoelectric theodolite rotates by theta 1, the two-dimensional rotary disc rotates by -theta 1, the center of the flat-topped optical fiber in the field of view is located in the center of the cross wire again, an optical power value is recorded, and the point source transmittance PST (theta 1) of theto-be-measured optical device at the moment is calculated; the rotation angle of the photoelectric theodolite is continuously adjusted to obtain a series of theta i and PST (theta i), and a PST curveis drawn. The method is advantaged in that the method improves the dynamic range of point source transmittance measurement, and is simple in principle, convenient to operate and easy to implement.

Description

technical field [0001] The invention relates to the field of optical detection, in particular to a point source transmittance test system and a test method of an optical device. Background technique [0002] In a wireless optical communication system, in order to realize the establishment of a long-distance communication link, it usually starts from three aspects, that is, reducing the divergence angle at the transmitting end, increasing the receiving aperture at the receiving end, and increasing the sensitivity of the photodetector. In practical applications, due to the existence of diffraction limit and tracking accuracy, the reduction of the divergence angle of the emitted beam is limited. Due to the limitation of the manufacturing process of the large-aperture objective lens, the requirements of equipment volume, weight and power consumption of the turntable, the aperture of the receiving objective lens cannot be continuously increased. The design of highly sensitive de...

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