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A method for generating mid-infrared supercontinuum in communication band based on silicon nitride waveguide

A production method and technology of silicon nitride, applied in instruments, nonlinear optics, optics, etc., can solve the problems of inconvenient on-chip photon integration, limit the efficiency of nonlinear effects, unstable performance of sulfide waveguides, etc., to overcome nonlinear optical The effect of power consumption

Active Publication Date: 2019-10-25
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0010] Comprehensive analysis of the above situation shows that the first four types are not easy to realize on-chip photon integration. Although the latter two types can be integrated, the performance of sulfide waveguides is relatively unstable, and silicon waveguides have large two-photon absorption and free carrier in the optical communication band. carrier absorption effect, which greatly limits the efficiency of nonlinear effects

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  • A method for generating mid-infrared supercontinuum in communication band based on silicon nitride waveguide
  • A method for generating mid-infrared supercontinuum in communication band based on silicon nitride waveguide
  • A method for generating mid-infrared supercontinuum in communication band based on silicon nitride waveguide

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Embodiment 1

[0034] This embodiment provides a supercontinuum generation method capable of realizing near-infrared to mid-infrared bands.

[0035] Such as figure 1 As shown, the silicon nitride waveguide structure in this embodiment includes a silicon dioxide oxide layer 102 disposed on a silicon wafer 101, and the silicon dioxide oxide layer 102 is etched on the surface to form a groove 103 containing a single silicon dioxide ridge, And fill the grooves 103 on both sides of the ridge-shaped silicon dioxide with silicon nitride, and finally cover the entire structure surface with a layer of silicon nitride reverse structure 104, its dispersion characteristics and mode field distribution are as follows: figure 2 shown.

[0036] refer to image 3 , during specific implementation, the femtosecond laser 301 emits an ultrashort optical pulse with a center wavelength of 1.804 microns, a full width at half maximum and a peak power of 50 femtoseconds and 10 kilowatts respectively, passing throu...

Embodiment 2

[0040] Such as Figure 5 As shown, the supercontinuum is realized based on the nonlinear effect in the flat and highly nonlinear inverted silicon nitride waveguide with dispersion, and the example of the influence of input optical power changes on the performance of the supercontinuum. The femtosecond laser 301 emits a central wavelength of 1.804 microns, half value Ultrashort optical pulses with full width and peak power of 50 femtoseconds and 10 kilowatts respectively, after passing through the polarization control system composed of half-wave plate 302 and polarizing beam splitter 303, are further coupled and injected into the ridge / groove with flat dispersion by lens 304 Slot-mixed inverted silicon nitride waveguide 305, due to the high peak power of the femtosecond pulse, combined with the large nonlinear coefficient of the silicon nitride waveguide 305, self-phase modulation, cross-phase modulation, and four-wave mixing occur inside it , soliton frequency shift, dispersi...

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Abstract

The invention discloses a method for generating supercontinuum from the communication band to the middle infrared based on a silicon nitride waveguide. The method comprises the steps of step 1, using an ultrashort pulse light source to emit the light which has a frequency of 8-12MHz, and a central wavelength of 1.4-2.2 micrometer, step 2, conducting lens coupling of ultrashort femtosecond pulses which is then infused into a ridge / groove hybrid reverse silicon nitride waveguide with a flat light dispersion, wherein the structure of the silicon nitride waveguide comprises a silica oxide layer arranged on a silicon plate, the grooves containing a single silica ridge is formed on the surface of the silica. The silicon nitride waveguide applies the structure of the ridge / groove hybrid to make the effect area of the light field small, and achieve a big non-linear coefficient of the waveguide. After high peak power femtosecond optical pulses are introduced into the waveguide, non-linear processes of self phase modulation, cross phase modulation, four-wave mixing, soliton frequency shift, dispersive wave generation and the like occur, and finally the supercontinuum from the communication band to the middle infrared is formed.

Description

technical field [0001] The invention relates to the technical field of integrated photonic communication and sensing on an optical chip, in particular to a method for generating a supercontinuum spectrum from an optical communication band to a mid-infrared band. Background technique [0002] Supercontinuum spectrum refers to the spectrum in which the light intensity is continuously distributed with frequency changes in a wide frequency range. It is a complex phenomenon that the spectrum broadens sharply (the broadening can reach tens to thousands of nanometers) when a high-intensity pulse passes through a nonlinear material. non-linear phenomenon. Since supercontinuum spectroscopy has extensive and important applications in many scientific fields such as pulse compression, optical communication, optical coherence tomography, spectral analysis and optical sensing, ultrashort pulse generation, and optical frequency combs, it has been an international research hotspot in recent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/365
CPCG02F1/365G02F1/3528
Inventor 惠战强
Owner XIAN UNIV OF POSTS & TELECOMM
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