All-optical multi-wavelength conversing method and device based on photonic crystal

A technology of photonic crystals and conversion devices, which is applied in light demodulation, light guides, optics, etc., can solve problems such as the limitation of the application range of all-optical wavelength conversion bands, saturation of optical power density, and impact on conversion efficiency, and achieve high-efficiency multi-wavelength selection. frequency output, high flexibility and freedom, simple and compact effect

Inactive Publication Date: 2012-10-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, with the increase of the pump optical power, the free carrier absorption effect of the silicon wire waveguide gradually becomes obvious, and the optical power density will appear saturated, which will affect the further improvement of the conversion efficiency.
[0006] From the above reports, although these all-optical wavelength conversion technologies based on nonlinear optical materials have made great progress, they still face some basic difficulties that need to be solved.
For example, the realization of wavelength conversion requires specific incident light frequency, high enough pump light power density, strict phase matching conditions, etc., and the current nonlinear optical materials that can be used for wavelength conversion are still relatively limited, which makes all-optical wavelength Converted bands and their range of applications are limited

Method used

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  • All-optical multi-wavelength conversing method and device based on photonic crystal
  • All-optical multi-wavelength conversing method and device based on photonic crystal
  • All-optical multi-wavelength conversing method and device based on photonic crystal

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Embodiment 1

[0033] Such as figure 1 As shown, the linear photonic crystal-based all-optical multi-wavelength conversion device of this embodiment includes a continuous light single-frequency pump laser (CW LD) 1, an ultrashort pulse laser (Pulsed LD) 2, and a linear photonic crystal multi-wavelength conversion system (PC MWCS) 3. Between the continuous light single-frequency pump laser 1 and the linear photonic crystal multi-wavelength conversion system 3, a 50×microscopic objective lens 4 and a 50×microscopic objective lens 5 are sequentially arranged along the direction of the optical path; the linear photonic crystal multi-wavelength conversion system Between the conversion system 3 and the ultrashort pulse laser 2, a 50×microscopic objective lens 6, a half-transparent mirror 8, and a 50×microscopic objective lens 7 are sequentially arranged along the optical path direction. The operating wavelength of the continuous light single-frequency pump laser 1 is λ=(1550±1)nm, the center wavel...

Embodiment 2

[0045] Such as image 3 As shown, the present embodiment is all the same as embodiment 1 except the following features.

[0046] The point defect 16 of the rear linear photonic crystal reflective cavity mirror of the linear photonic crystal multi-wavelength conversion system is formed by a square dielectric column of 0.42a×0.42a or 0.46a×0.46a instead of the original circular dielectric column at this position.

[0047] This embodiment realizes the frequency-selective output of multiple wavelengths, because at this time the side length of the point defect is reduced from 0.8a×0.8a to 0.42a×0.42a (the wavelength of the corresponding defect mode is λ 01 ) or 0.46a×0.46a (the corresponding defect mode wavelength is λ 02 ), such that the multimode of point defect modes (λ 01 and lambda 02 ) becomes a single-mode (λ 01 or lambda 02 ). When the ultrashort pulse laser is incident from the waveguide, only a single defect mode in the point defect 16 can be excited out (that is, λ...

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Abstract

The invention discloses an all-optical multi-wavelength conversing method based on a photonic crystal. The method comprises the steps of: firstly exciting each resonator mode of a multi-mode resonant microcavity of the photonic crystal through superconducting pulse laser, and then pumping the resonant microcavity of the photonic crystal by using single-frequency continuous laser so as to continuously transfer the pumping light energy into each resonator mode of the resonant microcavity of the photonic crystal. A point detect is introduced into a reflection mirror cavity on one side of the output end of the photonic crystal at the same time, and therefore the wavelength of a defect mode of the point defect can be the same as that of the resonator mode to be output based on frequency selecting, and efficient multi-wavelength frequency-selecting output can be achieved. With the adoption of the all-optical multi-wavelength conversing method, the multi-wavelength conversion can be achieved under any pumping light power without limitation of the nonlinear optical material, the phase matching condition and the pumping light power strength; and moreover, the conversed target wavelength can be freely operated and controlled by elaborately designing the point defects of the resonant microcavity of the photonic crystal and the reflection mirror cavity.

Description

technical field [0001] The invention relates to all-optical multi-wavelength conversion technology, in particular to a photonic crystal-based all-optical multi-wavelength conversion method and a device thereof. Background technique [0002] Wavelength conversion technology is an important means of obtaining new light sources, and has extremely broad application prospects in the fields of optical fiber communication, single photon detection, high-capacity optical data storage, and biomedical diagnosis. Since the advent of lasers, wavelength conversion technology has been one of the research hotspots in the optical field, and has been highly valued by governments, scientists and business circles. [0003] Wavelength conversion technology can be divided into photoelectric optical wavelength technology and all-optical wavelength conversion technology. The former is to first detect the optical signal and convert it into an electrical signal, and then use the electrical signal to...

Claims

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Application Information

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IPC IPC(8): G02F2/00G02B6/122
Inventor 李潮吴俊芳
Owner SOUTH CHINA UNIV OF TECH
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