On-chip variable optical attenuator based on mach zehnder interferometer
A technology of dimming attenuation and interferometer, which is applied in the field of optical communication, can solve problems such as difficulty in meeting the optical power adjustment needs of integrated optical communication chips, and achieves the effects of satisfying optical power attenuation and precise regulation, flexible implementation, and reduced size.
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[0028] Such as figure 1 As shown, an on-chip adjustable optical attenuator based on a Mach-Zehnder interferometer includes a Mach-Zehnder interferometer structure 1 and an optical path adjustment unit 2; the Mach-Zehnder interferometer structure 1 includes an input waveguide 11 and an output waveguide 12 , a beam splitter 13, a beam combiner 14, a first transmission waveguide 15 and a second transmission waveguide 16; the fixed arm length difference 17 is the geometric length difference between the first transmission waveguide 15 and the second transmission waveguide 16, and the fixed arm The arm length difference 17 is equal to 0 or not equal to 0; the optical path adjustment unit 2 is arranged on the second transmission waveguide 16 for dynamically adjusting the time when the light reaches the beam combiner 14 after passing through the second transmission waveguide 16 and the first transmission waveguide 15 Phase difference, so as to realize the drift of the output spectrum ...
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