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Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding

A transmission method and coding and decoding technology, applied in the field of optical fiber communication, can solve the problems of increasing the complexity and cost of the system, and achieve the effect of eliminating multiple access interference and eliminating beat noise.

Inactive Publication Date: 2015-01-07
GUANGXI NORMAL UNIV
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Problems solved by technology

However, this scheme requires an optical switch array in the process of electrical domain encoding, and the subcarrier multiplexing scheme requires multiple radio frequency signal sources to form a subcarrier multiplexed signal, using a laser array as a light source, which increases the complexity and cost of the system

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  • Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding
  • Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding
  • Optical code demultiplexing/multiplexing sending and receiving method and device based on electric domain encoding/decoding

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Embodiment Construction

[0064] An optical code division multiplexing transmission system based on electrical domain coding and decoding is mainly composed of an optical code division multiplexing transmitting device based on electrical domain coding and decoding and at least one optical code division multiplexing receiving device based on electrical domain coding and decoding.

[0065] The above-mentioned optical code division multiplexing transmission device based on electrical codec, such as figure 1 As shown, it is mainly composed of a programmable logic device encoder with n input terminals and L output terminals, a light source, L optical modulators, L optical circulators, L fiber gratings, and optical couplers. Each of the n input terminals of the programmable logic device encoder is connected with one user signal. In the present invention, the programmable logic device encoder such as figure 2 As shown, there are mainly n multipliers, n serial-to-parallel converters, and L adders. The two i...

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Abstract

The invention discloses an optical code demultiplexing / multiplexing sending and receiving method and device based on electric domain encoding / decoding. Different spread spectrum codons are used for digital signals of different users, spread spectrum encoding is carried out by an electric domain encoder, electric encoding signals of all the users are multiplexed, and all the encoding signals are modulated on one group of optical signals with different wave lengths for transmission. Wavelength demultiplexing and photoelectric conversion are first carried out on received optical signals by a wave demultiplexer / multiplexer at a receiving end, and data signals of target users can be recovered as long as corresponding decoder structures are used for the electric signals with different wavelengths. Compared with a traditional incoherent optical code demultiplexing / multiplexing system, the method has the advantages that influence brought by beating noise and multiple access interference can be better eliminated, and better system transmission performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to an optical code division multiplexing sending and receiving method based on electric domain coding and decoding used in an optical access network. Background technique [0002] Optical Code Division Multiple Access (OCDMA) is a communication method that combines Code Division Multiple Access (CDMA) technology with high-capacity optical fiber communication technology. Compared with other multiplexing technologies, OCDMA technology has the characteristics of supporting completely asynchronous transmission, being transparent to different transmission protocols, and having the ability to share channels with multiple users. Although researchers have proposed many optical codec design schemes, so far, there is still no suitable method to prepare a simple, low-cost optical codec that is convenient for large-scale commercial use. In addition, in order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/516H04B10/66
Inventor 李传起胡金林
Owner GUANGXI NORMAL UNIV
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