The Application Of Micro-ring Accumulator In∑-△Optical Analog To Digital Convertor

Using optical analog to digital conversion technology has been the development trend of high conversion rate, high bit accuracy analog to digital convertor (ADC). As a kind of optical ADC, E-A optical ADC has significant characteristics, such as high conversion accuracy and simply analog circuits. Relying on powerful optical signal processing capacity, simply production process, easy integration and other advantages, micro-ring resonator is considered as a basic component of large scale integrated photonic circuit in the future. This article realizes the integration function in the∑-△modulation by uising optical micro-ring resonator, which is a promising scheme.Supporting by the National Natural Science Foundation "Research of ultra high sampling polarization insensitive wideband all-optical analog to digital conversion technology", the article theoretical researches and simulates E-A optical ADC system. E-A optical ADC and optical micro-ring resonator are researched, separately. On this basis, optical micro-ring resonator is used to realize the integral function of E-A optical ADC. The main research focuses are as follows. The condition of realizing linear cumulation in the optical micro-ring resonator is deduced. It is pointed that the linear relationship of output optical pulse amplitude and analog voltage signal could be realized in the center modulation area of amplitude Mach-Zehnder interferometer (MZI). A phase modulation modular is added into the E-A optical ADC. Signal waveform diagrams of the whole system are simulated. Finally the analog to digital conversion of arbitrary waveform input signal is simulated.The main jobs of this article include the following:1) The development limitation of E-A electrical ADC and research progress of E-A optical ADC are thoroughly investigated and researched. The research background and research significance is expounded.2) The basic principle, key technologies and performance indexes are briefly introduced. The integral principle and transfer function of∑-△modulation are researched as a key. Then signal waveform diagrams of E-A electrical ADC are deduced.3) The basic principle of optical micro-ring resonator is briefly introduced. The transfer function and integral property of optical micro-ring resonator are researched and deduced as a key. The theory analysis shows that optical micro-ring resonator has integral function. The system structure of∑-△optical ADC is detailed. The components of system such as the generation of laser pulse, the modulation of directional MZI and magnitude MZI and the linear cumulation of optical pulse in optical micro-ring resonator are simulated and analyzed. It is pointed that the linear relationship of output optical pulse amplitude and analog voltage signal could be realized in the center modulation area of amplitude MZI. A phase modulation modular is added into the∑-△optical ADC. The signal waveform diagrams of the whole system and the analog to digital conversion of arbitrary waveform input signal are simulated and analyzed. Finally the signal to noise ratio (SNR) of∑-△optical ADC is researched.The∑-△optical ADC is numerically analyzed and theoretically simulated. The simulation results demonstrat that the integral function of∑-△optical ADC could be realized by optical micro-ring resonator, which has a widespread potential application value to optical analog to digital conversion technology.