Broadband light source and cascaded optical waveguide filter-based optical sensor

A broadband light source and optical sensor technology, applied in the coupling of optical waveguides, using optical devices to transmit sensing components, light guides, etc., can solve the problems of increasing the cost of measuring devices and reducing reliability, and achieve the effect of increasing sensitivity and reducing costs

Active Publication Date: 2010-09-08
浙江光尖电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These requirements have greatly increased the cost of the measurement device and reduced reliability

Method used

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  • Broadband light source and cascaded optical waveguide filter-based optical sensor
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  • Broadband light source and cascaded optical waveguide filter-based optical sensor

Examples

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Embodiment 1

[0033] figure 2 It is a schematic diagram of the first embodiment of the present invention. It includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference ring resonator 10 coupled with the input waveguide 1, a connection waveguide 3 coupled with the reference ring resonator 10, and a transmission waveguide coupled with the connection waveguide 3. Sensing ring resonator 20, output waveguide 2 coupled with sensing resonator 20, power meter 41 for measuring the output power at the other end of input waveguide 1, and power meter 42 for measuring the output power of output waveguide 2, the reference ring resonator 10 Same as the optical length of the sensing ring resonator 20, the optical length of the reference ring resonator 10 makes its resonant frequency correspond to a series of equally spaced operating frequencies, the optical length of the sensing ring resonator 20 makes Its resonant frequency coincides completely with th...

Embodiment 2

[0058] Figure 8 It is a structural schematic diagram of the second embodiment of the present invention. It includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference ring resonator 10 coupled with the input waveguide, a connection waveguide 3 coupled with the reference ring resonator 10, and a sensor coupled with the connection waveguide 3. Ring resonator 20, output waveguide 2 coupled with sensing resonator 20, optical power meter 41 for measuring the output power at the other end of input waveguide 1, and optical power meter 42 for measuring the output power of output waveguide 2, the reference ring resonator 10 is the same as the optical length of the sensing ring resonator 20, the optical length of the reference ring resonator 10 makes its resonant frequency correspond to a series of equally spaced operating frequencies, the optical length of the sensing ring resonator 20 Make its resonant frequency substantially overla...

Embodiment 3

[0062] The ring resonator among the present invention is to play the effect of an optical filter, has the advantage of high quality factor (Q value), but the ring resonator can be formed by a Mach-Zehnder (Mach-Zehnder) interferometer, array Filters such as waveguide gratings, Bragg gratings, or Fabry-Perot (Fabry-Perot) interferometers can be used instead, wherein the Fabry-Perot (Fabry-Perot) interferometer can be composed of two Bragg gratings.

[0063] Such as Figure 9 As shown, it includes a broadband light source 0, an input waveguide 1 coupled with the broadband light source, a reference optical filter 101 coupled with the input waveguide, a connection waveguide 3 coupled with the reference optical filter 101, and a transmission waveguide coupled with the connection waveguide 3 A sensing optical filter 102, an output waveguide 2 coupled with the sensing optical filter 102, an optical power meter 42 for measuring output power, the transmission frequency of the reference...

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Abstract

The invention discloses a broadband light source and cascaded optical waveguide filter-based optical sensor. The optical sensor comprises a wideband light source, an input waveguide, a sensing ring-shaped resonant cavity which is coupled with the input waveguide, a connection waveguide which is coupled with the sensing ring-shaped resonant cavity, a reference ring-shaped resonant cavity which is coupled with the connection waveguide, an output waveguide which is coupled with the reference resonant cavity, and two optical power meters, wherein the optical length of the sensing ring-shaped resonant cavity is the same as that of the reference ring-shaped resonant cavity; every resonance frequency of the sensing ring-shaped resonant cavity correspondingly coincides with that of the reference ring-shaped resonant cavity one by one; and at least a part of waveguide in the sensing ring-shaped resonant cavity is subjected to the detected variable influence or at least a part of waveguide cladding is contacted with the detected materials. As the movement which is caused by the detected variable influence or the change of the detected materials can be converted into the change of total transmission output power by using the cascaded filter effect of an isometric double resonant cavity, the measured quantity is simply and effectively detected.

Description

technical field [0001] The invention relates to an optical waveguide sensor based on a broadband light source and a cascaded optical waveguide filter, in particular to an optical waveguide sensor based on a cascaded ring cavity. Background technique [0002] As an important branch of information science and technology, optical sensing technology has very important applications in industrial process control, environmental monitoring, food safety and national security. Optical sensing technology can solve the problems of low sensitivity, susceptibility to interference, long sensing time and unsafe detection of certain chemical gases in electrical sensing technology. Optical sensors have the advantages of high sensitivity, small size, strong anti-electromagnetic interference ability, easy integration, and online detection, and they occupy an increasingly important position in the sensing field. [0003] The basic principle of the optical waveguide sensor device is based on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/34G01D5/353G01L1/24G01K11/32G01N21/41G02B6/26G02B6/293
Inventor 何建军金磊
Owner 浙江光尖电子技术有限公司
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