All-optical information exchange method based on second order nonlinearity

Abstract

The invention discloses an all-optical information exchange method based on second order nonlinearity. The method selects a single optical device with the second order nonlinearity, utilizes a second order nonlinear effect parameter attenuation and wavelength conversion combined function mechanism, and can achieve the information exchange function among wavelength carrying different data information in an all-optical domain. Information exchange is transparent to data modulation modes. Before the all-optical information exchange is performed by using the method, required pumping light wavelength is selected according to quasi-phase matching wavelength of the optical device with the second order nonlinearity, and simultaneously required pumping light luminous power is given according to the generation condition of the all-optical information exchange. The method uses the single optical device and is simple in scheme and easy to achieve. For selection of the single optical device, optical waveguide with the second order nonlinearity can be used flexibly and is small in size and easy to integrate.

Description

technical field [0001] The invention belongs to the optical communication technology, and relates to an all-optical information exchange method, in particular to a method for realizing all-optical information exchange with transparent modulation format by using the combination of second-order nonlinear parameter attenuation and wavelength conversion. Background technique [0002] The 21st century is the age of information. With people's urgent demand for increasing information, high-speed, large-capacity, and flexible all-optical networks will become an inevitable trend in the development of broadband communication networks in the future, and the high-speed all-optical information processing at network nodes that matches it is very important . All-optical information processing is carried out in the all-optical domain, which can avoid the speed limit brought by the electronic bottleneck of traditional "optical-electrical-optical" information processing. At present, the res...

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Problems solved by technology

[0003] The implementation of traditional wavelength-domain optical information exchange technology is relatively complicated, and usually requires multiple use of multiple wavelength converters

For example, if two optical wavelengths (λ S1 ,λ S2 ) carried data information, we can first use two optical filters for optical wavelength separation, and then use two wavelength converters to perform two wavelength conversions (λ S1 → lambda S2 ,λ S2 → lambda S1 ) to exchange information Additional optical filters are required after each wavelength converter to filter out the converted light (λ S2 ,λ S1 ), and finally combine the two optical wavelengths together. This process undergoes multiple optical filtering and optical wavelength conversion, which requires the use of multiple optical components such as two wavelength converters, four optical filters, and optical couplers, which greatly Increased system complexity and cost

In 2002, K.Uesaka of Sumitomo Electric Industries in Japan and K.K.-Y.Wong of Stanford University in the United States proposed to use the third-order nonlinear effect of non-degenerate four-wave mixing in high nonlinear dispersion-shifted optical fibers to realize the wavelength of 10 Gbit / s Exchange, but the reported wavelength exchange is only for binary on-off keying (OOK) signals, and no analysis is made on whether advanced modulation formats such as phase modulation are supported

At the same time, the exchange efficiency of the third-order nonlinearity is relatively low

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