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The output Gaussian beam quality and excellent collimation characteristics are ensured using a compact structural design with tilted end fibers and aspheric lenses that have been accurately adjusted. The lenses and fiber surfaces are coated with anti-reflection films, greatly reducing the back reflection of the output end face and lowering optical link noise. The long-focus collimator uses a bending housing to correct the output angle caused by the tilted end fibers. In contrast, the short-focus collimator uses a straight-through housing where the angle of the output light caused by the tilted end fibers can be ignored.