Title:
METHODS AND APPARATUS FOR ON-CHIP DERIVATIVE SPECTROSCOPY
Document Type and Number:
WIPO Patent Application WO/2018/137562
Kind Code:
A1
Abstract:
Derivative spectroscopy system (300) for achieving a tunable resolution of 2nm or less in resolving spectral components (328) of an input optical signal (380) is provided so as to estimate derivative spectra of the input optical signal (380) based on the resolved spectral components (328). In the derivative spectroscopy system (300), a first dispersive-element structure (310) spectrally decomposes the input optical signal (380) into subband signals (318). A second dispersive-element structure (320) receives part or all of the subband signals (318) and spectrally decomposes the received subband signals (318) to plural spectral components (328). A material having a temperature-variant refractive index is used to build the second dispersive-element structure (320), enabling a shift of center wavelength of each spectral component (328) as small as 2nm of less upon changing a temperature of the second dispersive-element structure (320). By obtaining three spectral-component sets obtained at three different predetermined temperatures with the center-wavelength shift of 2nm or less, first-and second-order derivative spectra are obtained with good accuracy.
Inventors:
WANG JIAQI (CN)
ZHANG CHUN (CN)
TSANG WEI MONG (CN)
ZHANG CHUN (CN)
TSANG WEI MONG (CN)
Application Number:
PCT/CN2018/073381
Publication Date:
August 02, 2018
Filing Date:
January 19, 2018
Export Citation:
Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
G01N21/31; G01J3/44
Domestic Patent References:
| WO1983000065A1 | 1983-01-06 | |||
| WO2003102520A1 | 2003-12-11 |
Foreign References:
| US20060164639A1 | 2006-07-27 | |||
| CN103604501A | 2014-02-26 | |||
| CN103424369A | 2013-12-04 | |||
| CN102680454A | 2012-09-19 | |||
| US20140085632A1 | 2014-03-27 |
Attorney, Agent or Firm:
CHINA PAT INTELLECTUAL PROPERTY OFFICE (CN)
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