Study on the Radiation-Mode Light of the Lithium Niobate Electric-optical Intensity Modulator with M-Z Optical Waveguide
The radiation-mode light radiated from an M-Z optical waveguide may couple with the fiber,and this is the main factor leading to failure of the high-precision coupling between a chip and the fiber array.This study used fiber to scan the waveguide and radiation-mode light with a high-precision coupling method and studied the center position of the radiation-mode light regions,the characteristics of the radiation-mode light power that changed with the bias voltage,and the power distribution characteristics of the waveguide and radiation-mode light scanned by the fiber.The effective coupling ranges of the waveguide in the X and Y directions were 14～15.5 and 14～16 μm,respectively,and the effective coupling ranges of the radiation-mode light in the X and Y directions were 89～92 and 92～96 μm,respectively.The study investigated the characteristics of the radiation-mode light to formulate the correct solution and solve the coupling failure caused by radiation-mode light.
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