Optical attenuator module with automatic regulation function
An automatic adjustment and attenuator technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of difficult optical signal power level, stable consistency, poor stability, etc.
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[0029] There are three main structures used to realize the optical attenuator: Y-branch optical attenuator (such as figure 1 shown), direct coupler optical attenuators (such as figure 2 shown), multimode interference optical attenuator (such as image 3 shown). No matter what kind of structure is adopted, its basic principle is the principle of Mache-Zender interferometer, which will be introduced first below.
[0030] The Gaussian beam coming out of the single-mode fiber is coupled into the device through the input waveguide. At node A, it is divided into two beams with equal intensity and enters two symmetrical single-mode waveguides respectively. Since the structures on both sides are symmetrical, the intensity of the two beams is equal, and the phase Also the same, the "Y"-shaped branch structure near the node A (referred to as the Y branch structure 101) mainly completes the function of dividing a beam of light into two beams in equal proportions, and the electric fiel...
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