Code overlapped fast hopping optical CDMA access system

An optical code division multiple access and access system technology, applied in optical multiplexing systems, transmission systems, electromagnetic wave transmission systems, etc., can solve the problems of low throughput and high cost, and achieve low optical power loss and high efficiency Application prospect, good confidentiality effect

Inactive Publication Date: 2003-12-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to aim at the deficiencies in the prior art, and propose a novel code bit overlapping fast frequency hopping optical code division multiple access system that is ea...

Method used

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  • Code overlapped fast hopping optical CDMA access system
  • Code overlapped fast hopping optical CDMA access system
  • Code overlapped fast hopping optical CDMA access system

Examples

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Embodiment Construction

[0022] figure 1 It is a functional block diagram of the system of the present invention.

[0023] Such as figure 1 The system shown uses a star topology. There are N user terminals in the system, and each user has an optical encoder and an optical decoder in the transmitter and receiver respectively. The optical encoder spreads the user information bits into a coded sequence and sends it to the optical fiber network. The optical fiber network is composed of passive components such as optical fibers, couplers, and optical splitters. The optical signal in the optical fiber network enters the optical decoder of the receiving user through the splitter, completes the signal decoding, and sends the information bit data to the user terminal.

[0024] figure 2 It is a structural schematic diagram of an optical encoder and an optical decoder of the system of the present invention.

[0025] in, figure 2 (a) is the optical encoder of the present invention, figure 2 (b) is the o...

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Abstract

A code-overlapped fast-hopping optical CDMA access system is disclosed. The light source is directly modulated by the data bit of user terminal in optical coder. The generated broadband optical pulses pass through optical loop channel and then into optical fibre raster and optical fibre delay array. The data pick-up circuit in conventional IM/DD digital optical transmission system is used to pick up the data bits. Its advantages are simplified system structure, free addressing, high security, less loss of optical power, high bit rate and throughput of user information and low cost.

Description

Technical field: [0001] The present invention relates to a fast frequency hopping optical code division multiple access system, in particular to a new type of easy-to-implement code bit overlapping fast frequency hopping optical code division multiple access system, which can realize direct modulation of broadband light sources by information bits, The spread spectrum code bits are overlapped and sent, and the decoding output is directly detected, and then the judgment output is made. It can be used in systems such as metropolitan area network, access network, and local area network, and 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 metropol...

Claims

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Application Information

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IPC IPC(8): G02B6/24H04B10/25H04J14/00
Inventor 沈成彬范戈
Owner SHANGHAI JIAO TONG UNIV
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