A Calibration Device for Large Range Continuous Optical Path Delay Line

Abstract

The invention belongs to the field of optical fiber sensing and optical measurement, and particularly relates to a calibrating device for a large-range continuous optical path delay line. The calibrating device for the large-range continuous optical path delay line comprises a broadband light source, a 2*2 coupler, a continuous optical path delay line and a photoelectric signal converting and signal recording device, wherein the broadband light source is connected with the first input end of the 2*2 coupler through a segment of transmission optical fiber; the two output ends of the 2*2 coupler are connected with two transmission arms of an interferometer respectively; a fixed arm is formed by connecting a periodical delayer of a fixed length and an optical reflecting mirror; an optical path scanning arm consists of the continuous optical path delay line; the second input end of the 2*2 coupler is connected with the photoelectric signal converting and signal recording device. According to the calibrating device, high-precision measurement of the optical path delay amount is realized by means of the feature of the periodical delayer of the fixed length and high-precision scanning of a programmable displacement table, and the delay accuracy can be up to an fs magnitude.

Description

technical field [0001] The design of the invention belongs to the field of optical fiber sensing and optical measurement, and specifically relates to a calibration device for a large-range continuous optical path delay line. Background technique [0002] In recent years, optical fiber transmission has been widely used in the field of communication and developed rapidly. And the research and application of various optical fiber devices have also emerged. As a new signal processing device, the fiber delay line (Fiber DelayLine, FDL) has developed from a simple section of optical fiber to an independent device with multiple complex structures at the present stage, and has become one of the key devices in optical information processing technology. Processing functions, such as participating in the acquisition and transmission of measurement signals in fiber optic sensing and optical measurement systems, realizing signal encoding and buffering in fiber optic communication system...

AI Technical Summary

Problems solved by technology

At present, the commonly used variable optical delay line is composed of multiple optical fibers or optical waveguides, and the length of each optical path is different. Through the selection of cascaded optical switches, the optical signal can pass through optical fibers or waveguides of different lengths to obtain different delay times. , but for now, the optical delay line has several disadvantages: 1. The incrementally adjustable delay line has a large delay range, but it is not continuously adjustable; 2. The continuously adjustable delay line has high adjustment accuracy, but The delay range is usually small, usually below a few hundred ps; 3. The delay line connection loss is large and the accuracy is low

Compared with the patent of Zhang Chunxi et al., this patent has the advantages of adopting feedback control, faster processing speed, high precision, and automatic adjustment, but the disadvantage is that the measurement range is limited, and the measurement of the optical fiber delay line is limited by the micro-displacement measurement module

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