A large range optical delay device

Abstract

The invention belongs to the field of optical fiber sensing and optical measured, in particular to a wide-range optical delay device. The wide-range optical delay device consists of a step type optical path multiplication device and a continuous optical path scanning device which are connected through a transmission optical fiber; wherein, the range of optical path continuous scanning of the continuous optical path scanning device is 0 to X0; the step type optical path multiplication device (110) is composed of n different delay light paths a0, a1 ...... an of fixed length, the optical path of delay light path is respectively L0, L1 ......, Ln (L0=0, n=0,1,2,......,), the optical path of adjacent delay light paths increases to meet Ln+1-Ln<X0, X0-d<Ln+1-Ln<X0, and Ln+2-Ln+1<=Ln+1-Ln, according to the invention, a fixed delay module and a variable optical path delay mechanism are combined together to achieve a continuous expansion of arbitrary optical path; the device realizes a seamless connection of the optical path by means of high-precision scanning platform to meet the continuous scanning function in the same precision.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing and optical measurement, and in particular relates to a large-range optical delay device. Background technique [0002] In recent years, optical fiber transmission has been widely used and developed rapidly in the field of communication. The research and application of various optical fiber devices have also emerged. As a new signal processing device, the Fiber Delay Line (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. Various signal processing functions, such as participating in the acquisition and transmission of measurement signals in optical fiber sensing and optical measurement systems, realizing signal encoding and buffering in optical fiber communication systems, and realizing accurate microwave signals in optical...

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

[0006] In 2007, people such as Oleg M.Efimov of the United States disclosed a kind of digitally controllable optical delay line [Digitally controlled optical fiber delay line, US Patent, 7283708B2], this invention has utilized the optical fiber module of multi-array (optical beam splitter , fiber amplifiers, connectors and optical collimators, etc.) to extend the optical path; compared with traditional methods, it is more powerful and versatile, but it cannot achieve continuous adjustment of the optical path, and the structure is more complicated

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