Spectrum analyzer based on liquid crystal on silicon and realization method thereof

Abstract

The invention discloses a spectrum analyzer based on a liquid crystal on silicon and a realization method thereof. The realization method comprises the steps that after a light beam is collimated by a collimator array, the light beam is converted to polarized light with the same polarization state through a polarization conversion unit, and after beam expanding is conducted on the polarized light through a beam expanding unit, output X direction polarized light projects on a diffraction grating to generate corresponding diffraction light; a phase position of the liquid crystal on silicon is changed through a control unit to make the diffraction light project on different positions of the liquid crystal on silicon; the diffraction light reflected by the liquid crystal on silicon is converged through a convergence unit and projects on the diffraction grating again; the diffraction light returned from the diffraction grating passes through the beam expanding unit and is output by the collimator array; the beam output by the collimator array is received through a photoelectric detector and light intensity is recorded. According to the spectrum analyzer based on the liquid crystal on silicon and the realization method thereof, spectrum analysis is conducted through the liquid crystal on silicon, spectral lines are distributed evenly, and outside vibration influence on the spectrum analysis does not exist.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a silicon-based liquid crystal-based spectrum analyzer and a realization method thereof. Background technique [0002] Spectrum analyzer is a commonly used instrument for spectrum analysis of optical signals, which has several major functions such as optical signal acquisition, dispersion, and imaging. The analysis principle of the spectrum analyzer is that the characteristic spectrum of the element to be measured radiated by the light source is absorbed by the ground state atoms of the element to be measured in the vapor of the sample, and the content of the element to be measured in the sample is obtained by the degree to which the emission spectrum is weakened. . [0003] The process of emission spectrum analysis is: evaporate and atomize the sample under the action of energy, and excite the outer electrons of the gaseous atoms to a high energy state. When transitioning f...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the existing spectrum analyzer uses mechanically rotating diffraction gratings to split light and perform spectrum analysis, which makes the distribution of spectral lines uneven and the spectrum analysis easily affected by external vibrations

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