Data transmitting method utilizing optical code division multiple access technique

A data transmission method, optical code division multiple access technology, applied in the direction of multiplexing communication, optical multiplexing system, electrical components, etc., can solve the problem of limiting the flexibility of data transmission, and achieve good code rate flexibility , reduced cost and complexity, and simple system structure

Inactive Publication Date: 2007-06-06
TIANJIN UNIV
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Problems solved by technology

However, this requires that the encoder of each user can only be applied to a certain fixed transmission rate, that is, only one service is supported, and a strict integer multiple relationship must be guaranteed between the various rates transmitted by each user in the system, so that Orthogonality can be guaranteed, thus greatly limiting the flexibility of each user to transmit data

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  • Data transmitting method utilizing optical code division multiple access technique

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Embodiment Construction

[0015] The data transmission method using optical code division multiple access technology provided by the present invention does not need to consider whether there is an integer multiple relationship between the data to be transmitted or received by each user in the system. Before encoding the address code, all the data to be sent must be modulated by a digital chip clock at the same rate, which can be performed in the electrical domain or in the optical domain. The scheme adopted is to fix the minimum chip period to tc , so signals with different rates contain different minimum chip periods. Although the rates of different users are different, the chip period is the same, so that it can ensure that the various rate signals have become the same rate signal with the symbol period equal to the digital chip period before entering the encoder, and the signals of different rates It is only composed of different chip clock pulses with the same pulse width. At this time, encoding i...

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Abstract

A data transmission method utilizing optical CDMA technique includes utilizing electric domain CDMA to carry out electric domain spread spectrum coding by sending end and changing it to be optical signal by optical modulator, entering optical signal into another optical modulator to carry out optical domain spread spectrum coding and entering it into optical coder for coding, using optical decoder to carry out decoding and using photoelectric detector to restore it to be electric signal at receiving end then utilizing electric domain integrator and decision gate circuit to restore original data.

Description

technical field [0001] The invention belongs to the field of all-optical access network, and in particular relates to a data transmission method utilizing optical code division multiple access technology. Background technique [0002] At present, the key technologies in the field of all-optical access networks mainly include multiple access technology, address codes and the realization of corresponding codec devices. The multiple access technology is divided into time division multiple access, wavelength division multiple access and optical code division multiple access. This technology usually requires that the number of users that can be accommodated should be large enough, the cost of the device and the complexity of the system should be low, and the confidentiality should be high. Since time division multiple access requires strict synchronization at a high rate, it is difficult to implement; although wavelength division multiple access is simple to implement, the price...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/00
Inventor 付晓梅
Owner TIANJIN UNIV
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