Incoherent chirp-encoding optical CDMA access system

A code division multiple access, coded optical technology, applied in transmission systems, electromagnetic wave transmission systems, optics, etc., can solve the problems of difficult system implementation, immature coherent optical signal processing and transmission technology, etc., and achieve a simple system structure. , low cost, easy to achieve effect
CN1187913CInactive Publication Date: 2005-02-02SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAO TONG UNIV
Publication Date
2005-02-02
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The present invention is one incoherent chirp-encoding optical CDMA access system. The optical encoder consists of linear chirp fiber grating, optical circulator, fiber delay line network and optical synthesizer. The data bit modulating ultrashort pulse laser outputs wideband ultrashort optical pulses, which are shunted in a shunt and passed through separate fiber delay line to form two ultrashort pulse sequences. After passing through two optical circulators and chirp fiber grating, two expanded pulse sequences are synthesized into one bipolar chirp-encoded frequency expanding signal. Via a similar process in the optical decoder, one decoded strong output pulse is formed. The present invention has complete fiber structure of coder, and is easy to be integrated, great in system capacity and low in code error rate.
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Description

technical field

[0001] The invention relates to a new type of non-coherent chirp coding optical code division multiple access system, which can realize multiple access by using bipolar coding in radio frequency CDMA system, and can be used in metropolitan area network, access network, local area network, etc. The system belongs to the technical field of optical fiber communication. Background technique

[0002] With the rapid development of optical fiber communication technology, the backbone network has basically realized optical fiber, and the transmission capacity of the system has greatly increased. However, with the rapid growth of business volume and the development of new data services, the metropolitan area network and access network cannot meet The requirements of the development of communication technology have become the bottleneck of the network, and introducing optical fiber into the metropolitan area network and access network has become the best solution to th...

Claims

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