On-chip integrated optical digital-to-analog converter based on silicon-based nanowire waveguide

Abstract

The invention discloses an on-chip integrated optical digital-to-analog converter based on a silicon-based nanowire waveguide. The on-chip integrated optical digital-to-analog converter comprises N laser devices, a modulation multiplex integral structure and a photoelectric detector. The modulation multiplex integral structure comprises a trunk waveguide L0, N cascaded silicon-based nanowire waveguide micro-ring resonators (MRR1, MRR2...MRRN) and N bent waveguides (L1, L2...LN), the N laser devices are connected with the uploading ends of the N bent waveguides (L1, L2...LN) respectively, the photoelectric detector is connected with the straight-through end of the trunk waveguide L0, and N is a natural number. According to the on-chip integrated optical digital-to-analog converter, the advantages that the silicon-based waveguide is compact in structure, low in power consumption, compatible with the CMOS process and the like are fully achieved, the high speed and high resolution in the DAC process can be achieved, and the integration and miniaturization of the optical DAC can be achieved.

Description

technical field [0001] The invention belongs to the technical field of optical information processing and high-bandwidth signal processing, and in particular relates to an on-chip integrated optical digital-to-analog converter based on a silicon-based nanowire waveguide. Background technique [0002] In recent years, with the continuous improvement of information-based living standards, the information interaction and integration between the actual physical world that people exist and the virtual world of digital information processing is developing in the direction of diversification, refinement and high speed. Ultra-high-speed, high-resolution analog-to-digital converter (Analog-to-digital Converter, ADC) and digital-to-analog converter (Digital-to-analog Converter, DAC) as a bridge between the analog world and the digital world, in wireless communication , Biomedical, industrial automation, radar and sonar systems, aerospace, satellite communications and other high-bandwi...

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Problems solved by technology

[0007] The document "All-optical digital-to-analog conversion using nonlinear optical loop mirrors" (IEEE Photonics Technology Letters, Vol.18, Iss.5, 2006, pp.703-705) uses a fiber optic loop mirror to achieve a resolution of 2bit, An all-optical integrated digital-to-analog converter with a conversion rate of 1MHz. Because the length of the optical fiber and the optical phase are difficult to control precisely, this technology has limitations in conversion accuracy and scalability

The document "Integrated optical digital-to-analogue converter and its application to pulse pattern recognition" (Electronics Letters, Vol.37, Iss.20, 2001, pp.1237-1238) reported the integrated digital-to-analogue converter based on silicon-based optical waveguide delay line Mode conversion structure, but to achieve a high-resolution DAC must use a longer waveguide, contrary to the miniaturization goal

In addition, since the phase difference of the optical signal after transmission between the waveguides is fixed, the device can only work at a fixed sampling rate

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