Broadcast multicast data transfer method based on breadth re-modulation in passive optical network

A passive optical network, broadcast and multicast technology, applied in the selection device, electrical components, selection device and other directions of the multiplexing system, can solve the problem that is not conducive to the mass production of ONU equipment, cannot achieve colorless ONU, and is temperature sensitive. and other issues, to achieve the effect of promoting early popularization, being conducive to large-scale production and simple reception.

Inactive Publication Date: 2010-07-28
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This method solves the above problems, but the demodulation of the phase signal requires a Mach-Zehnder interferometer, which is very sensitive to temperature during operation and requires a temperature control system, so the cost is very high
In addition, since the Mach-Zehnder interferometer is a wavelength-dependent device, it is impossible to realize the colorless ONU, which is not conducive to the mass production of ONU equipment

Method used

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  • Broadcast multicast data transfer method based on breadth re-modulation in passive optical network
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  • Broadcast multicast data transfer method based on breadth re-modulation in passive optical network

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Embodiment Construction

[0018] In order to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] figure 1 A schematic diagram of the realization of the broadcast and multicast transmission method based on non-return-to-zero code / anti-return-to-zero code remodulation proposed by the present invention is given. At the optical line terminal (OLT) at the central office, each channel first modulates the optical carrier with its own downlink unicast data. The modulation format adopts NRZ modulation with limited extinction ratio. Each channel is then wavelength-division multiplexed, and the broadcast data is used to re-modulate the carrier that has carried the unicast data, and the modulation format is IRZ. The remodulated signal reaches the remote node (RN) through the feeder fiber, and then is decomposed into multiple channels by the wave division multiplexer, and is transmitted to...

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Abstract

The invention relates to a method for transmitting broadcast and multicast data based on amplitude remodulation in a passive optical network; unicast data is modulated with nonreturn-to-zero code; broadcast data is modulated with reverse return-to-zero code. Through carrying out the remodulation with the broadcast data on the basis of unicast modulating signal, the unicase and broadcast data are simultaneously loaded on a light carrier so as to realize simultaneous transmission of unicast and broadcast. Through controlling the extinction ratio of the nonreturn-to-zero code of the unicast to control the on / off of transmission function of the broadcast, dynamic multicast control is realized. The method can transmit the broadcast and multicast data simultaneously on the current unicast communication channel, with simple process and low cost, and meet the requirements of cells of a colorless optical network.

Description

technical field [0001] The invention relates to a broadcast multicast data transmission method based on amplitude remodulation in a passive optical network, which solves the problem of simultaneously transmitting broadcast and multicast data on an existing unicast communication channel, and belongs to the technical field of optical communication. Background technique [0002] Wavelength Division Multiplexing Passive Optical Network (WDM-PON) has become an effective solution for future broadband access networks due to its high communication capacity, large coverage, scalability, and inexpensive networking. WDM PONs utilize arrayed waveguide gratings to provide point-to-point connections. However, point-to-multipoint broadcast and multicast transmission need to be considered in practical system applications. For example, cable television signals need to be transmitted from the central office to all user terminals through broadcasting. If not all the users in the access netwo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00
Inventor 蔡磊肖石林刘智鑫李荣玉
Owner SHANGHAI JIAO TONG UNIV
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