Multimode interference element and Mach-Zehnder modulator

Abstract

The invention provides a multimode interference element comprising an input end face and an output end face and comprising a first input end located on the input end face and configured to receive a first branch optical signal, a second input end located on the input end face and configured to receive a second branch optical signal, a first output end located on the output end face and configured to output a working signal which can reach the maximum intensity value of a coherent enhanced signal of the first branch optical signal and the second branch optical signal with the phase difference of 2Npi, and a second output end and a third output end located on the output end face and are configured to output monitoring signals respectively. The monitoring signals can reach the set distribution proportion of the intensity maximum value of coherent enhanced signals of the first branch optical signals and the second branch optical signals with the phase difference of (2N+1)pi, N is 0 or a natural number, and the set distribution proportion is larger than 0 and smaller than 1. The invention further provides a Mach-Zehnder modulator comprising the multimode interference element, and the Mach-Zehnder modulator is high in intensity of output working signals and high in accuracy.

Description

technical field [0001] The present disclosure relates to the technical field of optical communication, in particular to a multi-mode interference element and a Mach-Zehnder modulator. Background technique [0002] The electro-optic effect means that when a voltage is applied to electro-optic crystal materials such as lithium niobate crystals, gallium arsenide crystals, or lithium tantalate crystals, the refractive index of the electro-optic crystal material will change, thereby causing the light wave passing through the electro-optic crystal material to change. The properties change. Using the electro-optic effect, the modulation of optical signal parameters such as phase, amplitude, intensity, and polarization state can be realized. [0003] The electro-optic modulator is a modulator based on the electro-optic effect of electro-optic crystal materials. The Mach-Zehnder modulator is a kind of electro-optic modulator, which divides the input optical signal into two branch o...

AI Technical Summary

Problems solved by technology

[0004] The inventors of the present disclosure have learned that when the Mach-Zehnder modulator is not working, there is already a certain phase difference between the two branch optical signals after passing through the two waveguide arms, and the phase difference will change with time and environmental conditions. changes, thus affecting the accuracy of the working signal output by the Mach-Zehnder modulator

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