A Gradient Nested Optical Superlattice Structure Dual-wavelength Arbitrary Ratio Wavelength Converter

Abstract

The invention discloses a double-wavelength any scale wavelength converter for a gradual change nested optical superlattice structure, and the converter can efficiently generate frequency multiplication light, which has different intensities and mixed in different scale, for signals with different intensities during the full-light processing of a double-wavelength signal. The converter is designed according to the wavelengths of two signal light beams, and one type of nonlinear crystal, a doping level and temperature are selected, thereby enabling a coherence length corresponding to the two light beams to meet a double relation, and constructing the gradual change nested optical superlattice structure. The signal light beams enter into the crystal from different positions, and frequency multiplication light with different intensity scales will be obtained.

Description

technical field [0001] The invention relates to a gradually nested optical superlattice structure dual-wavelength arbitrary ratio wavelength converter and a design method thereof, belonging to the technical fields of superlattice materials and lasers. Background technique [0002] With the rapid development of all-optical networks and dual-wavelength lasers, all-optical devices based on quasi-phase matching technology are more and more widely used in all-optical networks. The development of all-optical networks urgently needs more functional and more efficient all-optical wavelength conversion. device. [0003] In plenoptic processing it is sometimes necessary to be λ for two wavelengths 1 , lambda 2 The signal light is frequency multiplied. The common methods are: use complex optical paths to separate two wavelengths, and double the frequency in their respective optical paths. This method is complex and not compact; By cascading, the frequency of two wavelengths can be ...

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Problems solved by technology

The common methods are: use complex optical paths to separate two wavelengths, and double the frequency in their respective optical paths. This method is complex and not compact; By cascading, the frequency of two wavelengths can be multiplied without splitting. This method has a low crystal utilization rate; someone proposed a periodic nested structure, where the wavelength is λ 1 , lambda 2 The periodic structures corresponding to the signal light are nested and stacked together to form a quasi-periodic structure, which can be used for the wavelength λ 1 , lambda 2 The signal light is frequency-multiplied at the same time. This structure realizes double-wavelength frequency doubling, but the frequency-doubling efficiency cannot be controlled. Once the crystal structure and wavelength are λ 1 , lambda 2 The intensity of the signal light is determined, and the intensity of the two frequency-multiplied signal lights is also determined

In practical applications, sometimes the wavelength is λ 1 , lambda 2 The intensity of the signal light is different but the intensity of the two frequency multiplied signals is the same, and sometimes the wavelength is λ 1 , lambda 2 The signal light intensity of the signal is the same, but the light intensity of the two frequency-multiplied signals is different or mixed in a certain intensity ratio, and sometimes the wavelength is λ 1 , lambda 2 The intensity of the signal light is different, but the two frequency multiplied signal lights need to be mixed in a certain intensity ratio. At this time, this periodic nested structure is no longer applicable.

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