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Method for obtaining quality factor of micro resonant cavity

A technology of micro-resonator and quality factor, which is applied in the direction of testing optical performance, etc., can solve problems such as inability to locate and extract quality factor, and achieve the effect of reducing test difficulty and eliminating loss interference

Active Publication Date: 2020-02-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional measurement method is to use a spectrometer or an optical power meter to measure the quality factor through transmission, but this kind of transmission overall measurement will bring a big disadvantage, that is, when there is inevitable series loss or interference on the chip, the obtained is an overall value
Ordinary transmission measurement can only be a hybrid measurement, and cannot locate and extract the quality factor of a certain place inside

Method used

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  • Method for obtaining quality factor of micro resonant cavity
  • Method for obtaining quality factor of micro resonant cavity
  • Method for obtaining quality factor of micro resonant cavity

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with accompanying drawing.

[0024] figure 1 is a schematic flowchart of a method for obtaining the quality factor of a microresonator provided in this embodiment. The specific implementation steps of each process will be described below.

[0025] S1. Divide the frequency-sweeping laser into two paths, the first path of light is the reference light, the second path of light is coupled into the micro-resonator, and the back-reflected signal light of the micro-resonator is collected, and the obtained back-reflected signal light and reference light are in the coupler Beat frequency interference occurs in the laser beam, and the beat frequency interference signal superimposed by the resonant light is obtained.

[0026] The first light is directly sent into the coupler as a reference light; the second light enters the microcavity coupling device after passing through the circulator, and the microcavity co...

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Abstract

The invention discloses a method for obtaining a quality factor of a micro resonant cavity. The method comprises the following steps: dividing sweep frequency laser into reference light and light coupled into the micro resonant cavity, and collecting back reflection signal light of the micro resonant cavity, wherein the back reflection signal light and the reference light generate beat frequency interference in a coupler; applying Fourier transform to an obtained beat frequency interference signal to obtain a power attenuation signal of the micro resonant cavity in a distance domain; and obtaining the power attenuation factor through linear fitting, and finally calculating and determining the quality factor of the micro resonant cavity. The invention provides a novel method for calculatingthe quality factor of the micro resonant cavity, and the quality factor of the micro resonant cavity can be accurately and conveniently obtained only by single-end coupling input at the micro resonant cavity.

Description

technical field [0001] The invention relates to the field of photoelectron detection technology and photoelectric device characterization technology. In particular, it relates to a method for obtaining the quality factor of a microresonator cavity. Background technique [0002] The resonant cavity has always played an important role in the field of modern optics. It is not only the cornerstone of laser-related fields; at the same time, it is also widely used in precise measurement and detection, and plays a huge role in the field of nonlinear optics. However, certain characteristics of conventional optical resonators greatly limit its scope of use, such as size, weight, difficulty in alignment, and stability issues. In order to solve the above problems, people have focused on the development of integrated microresonators in recent years, including theoretical research, preparation and processing, performance testing and related applications of integrated microresonators. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/02
Inventor 刘晓平张笑裴吕海斌
Owner NANJING UNIV