Research Of The Silicon-based Integrated Photonic Device With Mach-Zenhder Interferometer Coupled Microring Structure

As a new information carrier,photons are concerned by more and more researchers.Compared with traditional electrical communication,optical communication has faster transmission rate and greater communication bandwidth.Silicon-based integrated optics,which has advantages of microelectronic technology in large-scale integration,low energy consumption and low cost,and light in high bandwidth,high speed and high anti-interference,has attracted more and more attention and gradually become the trend of future development.Having many advantages and important applications in signal processing,optical temporal differentiator is highly valued by many researchers at home and abroad.This thesis studies the silicon-based integrated photonic device with Mach-Zenhder interferometer(MZI)coupled microring structure on a silicon-on-insulator(SOI)platform.Main contents are summarized as follows:1)The operational principle of optical field differentiator and three main performance indexes of optical differentiator,device operation bandwidth,processing error and energy efficiency,are introduced.The basic principle of optical temporal differentiator based on microring resonator is briefly introduced,and widely tunable fractional order photonic differentiator using a Mach-Zenhder interferometer coupled microring resonator is further proposed.The simulation shows that the purpose of changing coupling state of the device can be achieved,when the phase difference between the two arms of the MZI is adjusted,thus tunable fractional order differential is realized.2)The configuration parameters and manufacturing process of MZI-MRR device are introduced.If we adjust the refractive index of the MZI upper arm waveguide by thermal-optical effect,the purpose of changing the phase difference between the upper and lower arms of the MZI can be achieved.The 3-dB bandwidth of the fabricated device is about 0.09 nm.The proposed differentiator presents a tunable differentiation order range of 0.25 to 1.75,and the average errors are less than 6%,which is the largest tuning range of a tunable photonic differentiator using a single microring resonator to the best of our knowledge.3)A tunable fractional order photonic temporal differentiator and programmable filter based on cascaded MZI-MRR devices are introduced.The proposed differentiator presents a tunable differentiation order range of 0.37 to 2.40,and the average errors are less than 8%.Finally,by adjusting the resonant frequency and depression spectrum depth of the microrings,we demonstrate the tenability of the central wavelength,bandwidth and variable filtering shape.