A Calibration Device for Large Range Continuous Optical Path Delay Line

A technology of calibration device and delay line, applied in the field of calibration device of large-range continuous optical path delay line, can solve the problems of low precision, small delay range, large delay line connection loss, etc., and achieve high-precision measurement, large scanning range, The effect of high measurement accuracy

Active Publication Date: 2016-08-03
HARBIN ENG UNIV
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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

Method used

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  • A Calibration Device for Large Range Continuous Optical Path Delay Line
  • A Calibration Device for Large Range Continuous Optical Path Delay Line
  • A Calibration Device for Large Range Continuous Optical Path Delay Line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Calibration device for reflective large-range continuous optical path delay line

[0063] The selection of main optoelectronic devices and their parameters are as follows:

[0064] (1) The central wavelength of the broadband light source 101 is 1550nm, the half-spectrum width>45nm, and the fiber output power>2mW;

[0065] (2) The working wavelength of the 2×2 coupler 103 is 1550nm, and the splitting ratio is 50:50;

[0066] (3) The working wavelength of the ring cavity 111 is 1550nm, and the insertion loss is ≤0.5dB;

[0067] (4) The working wavelength of the 1×8 optical switch 131 is 1550nm, and the insertion loss is ≤0.8dB;

[0068] (5) The extension fiber is G.652 ordinary fiber 132, and the model is SMF28e;

[0069] (6) The working wavelength of the optical collimator 141 is 1550nm, the optical path scanning distance between it and the movable optical mirror 143 (the reflectivity is above 95%) is changed between 0mm and 200mm, and the average insertion...

Embodiment 2

[0087] Example 2: Calibration device for transmission-type large-range continuous optical delay line

[0088] A calibration device for a transmission-type long-range continuous optical delay line is as follows: Figure 5 As shown, compared with Embodiment 1, most of the photoelectric device parameters are exactly the same, the difference is that in Embodiment 2, the continuous optical path scanning device adopts a group of optical collimators, a group of optical mirrors and a program-controlled displacement The length of the periodic delayer is changed when used with the station.

[0089] in such as Figure 5 In the shown structure, 1×8 optical switches are also used to form an 8-channel optical fiber delay line, and 8 discrete delay values ​​can be obtained. Such as Figure 6 Shown is the measurement process of the delay of the fiber delay line, as follows:

[0090] (1) Turn on the instrument, reset the optical switch, and reset the program-controlled stage to zero;

[0...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 杨军苑勇贵彭峰吴冰苑立波
Owner HARBIN ENG UNIV
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