1/f Noise Suppression System and Method Based on Frequency Transformation and Digital Filtering

Abstract

The present invention provides a 1 / f noise suppression system and method based on frequency conversion and digital filtering. The system includes: an optical domain radio frequency shaping module, which is used to form an optical signal with information to be measured and a radio frequency envelope; The frequency conversion module is used to convert the optical signal into an electrical signal, and the electrical signal is frequency-converted and processed to obtain a sampling signal; the digital filtering module is used to perform digital co-square sum and mean value filtering on the sampling signal to obtain an electrical signal. The intensity information is shaped into a radio frequency envelope by optically mixing the original signal, and the signal itself will be amplified. After the electrical frequency conversion, the optical signal with the radio frequency envelope is converted to an intermediate frequency by electrical mixing. Sampling to reduce 1 / f noise and keep away from the interference of its own 1 / f noise can better realize nano-micro information sensing in practical applications, improve performance and expand applications.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a 1 / f noise suppression system and method based on frequency transformation and digital filtering. Background technique [0002] Optical micro-nano sensing technology plays a very important role in scientific research, production and life. By converting optical signals reflecting such as environmental information, object properties, etc. into electrical signals, the detection and extraction of information of interest can be achieved. For the detection of nano and micro signals, extremely high sensitivity and extremely low detection limit are required in many application scenarios such as homeland security, environmental monitoring, biochemical reactions, physical processes, early diagnosis, and biometric identification. Among the many methods to improve the sensitivity and detection limit, most of them follow the principle of enhancing the interaction between l...

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Problems solved by technology

[0003] However, there are some key problems in the existing technology that hinder its practical application: 1. Optical microcavities usually require extremely high quality factors (Q value>10 6 ) to achieve a better enhancement effect, and related tests require narrow linewidth adjustable lasers; 2. This method of enhancing the interaction between light and matter will increase the local light intensity, which will cause irreversible damage to some samples and molecules , which needs to be avoided in the actual sensing field; 3. Based on the slot waveguide, although the slot fiber has higher robustness and relatively lower cost, the scheme of directly increasing the interaction area is also due to the process and other reasons without high sensitivity

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