Method and device for forming two-dimensional optical orthogonal code with zero correlation window

Abstract

The invention relates to a method for forming a two-dimensional optical orthogonal code with a zero correlation window, and the method comprises following steps of constructing a first sequence with the zero correlation window; constructing a second sequence; and mapping the first sequence and the second sequence to form the two-dimensional optical orthogonal code with the zero correlation window. The invention also relates to a device for realizing the method. The method and the device for forming the two-dimensional optical orthogonal code with the zero correlation window have following beneficial effects that the two-dimensional orthogonal code is completely orthogonal, i.e. the autocorrelation limit of the code is zero, cross-correlation limit of the code is also zero, and thus the multi-address interference and beat noise can be completely eliminated, the near-far effect of a two-dimensional optical code division multiple access (OCDMA) system also can be eliminated; therefore, the two-dimensional OCDMA system with large capacity can be realized, and the two-dimensional OCDMA system can be applied to an optical access network, an optical local area network, an optical code mark switching network, an optical fiber sensor network and the like.

Description

technical field [0001] The present invention relates to the field of optical communication, more specifically, to a method and device for forming a two-dimensional optical orthogonal code with a zero-correlation window. Background technique [0002] Optical Code Division Multiple Access (OCDMA for short) has the characteristics of broadband, security and random instant access, and is one of the best solutions for future high-speed local area networks and access networks. According to the degree of freedom, it can be divided into one-dimensional OCDMA system and two-dimensional OCDMA system. The address code of the two-dimensional OCDMA system not only expands in the time domain, but also expands in the wavelength, which is called two-dimensional optical orthogonal code. Two-dimensional optical orthogonal codes are generally obtained by expanding wavelength channels on the basis of one-dimensional optical address codes. [0003] At present, many scholars at home and abroad h...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a two-dimensional light with a zero-correlation window that is completely orthogonal and has ideal cross-correlation characteristics in view of the defects of the prior art that the above-mentioned address codes cannot be completely orthogonal and the cross-correlation characteristics are not ideal. Orthogonal code forming method and device

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