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Coherent passive optical network system and signal transmitting and receiving method

A passive optical network and coherent receiver technology, which is applied in multiplexing system selection devices, electromagnetic receivers, wavelength division multiplexing systems, etc., can solve the problem of high cost, achieve the advantages of high sensitivity and reduce costs , The effect of reducing the line width requirement

Active Publication Date: 2015-01-21
WUHAN POST & TELECOMM RES INST CO LTD
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  • Application Information

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Problems solved by technology

However, in other applications, such as optical access network applications, the cost of this technical solution is relatively high, so a low-cost coherent solution is urgently needed to realize the upgrading of the optical access network industry

Method used

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  • Coherent passive optical network system and signal transmitting and receiving method
  • Coherent passive optical network system and signal transmitting and receiving method
  • Coherent passive optical network system and signal transmitting and receiving method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] see figure 1 As shown, the embodiment of the present invention provides a coherent passive optical network system, including an OLT (Optical Line Terminal, Optical Line Terminal), a trunk fiber, a power splitter, a distributed fiber, and M coherent ONUs (Optical Network Unit, optical network unit), M is a positive integer. Wherein, the OLT includes k multi-carrier signal transceiving devices and a k-way wavelength division multiplexing and demultiplexing device, each multi-carrier signal transceiving device has a high-speed DAC (Digital-Analog Converter, digital-to-analog converter), through The digital method generates N channels of downlink digital signals. At the same time, the multi-carrier signal transceiving device can simultaneously receive N channels of uplink optical carrier signals, where M=k*N, where k and N are bo...

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Abstract

The invention discloses a coherent passive optical network system and signal transmitting and receiving method, and relates to an optical access network. The method includes the following steps that in the downlink direction, k multi-carrier signal transmitting-receiving devices in an OLT have high-speed DACs, each multi-carrier signal transmitting-receiving device generates N downlink digital signals in a digital method, the k multi-carrier signal transmitting-receiving devices and a wavelength division multiplexing and demultiplexer of one k path are combined to generate dense or super-dense wavelength division multiplexing signals, the dense or super-dense wavelength division multiplexing signals are selective received by a coherent ONU after passing a power distributor, and the coherent ONU achieves selection of channels by adjusting LO wavelength in coherent detection. The coherent passive optical network system is low in cost, simple in structure, high in sensitivity and suitable for a super-dense wavelength division multiplexing network.

Description

technical field [0001] The invention relates to an optical access network, in particular to a coherent passive optical network system and a signal sending and receiving method. Background technique [0002] With the technological upgrading of the optical communication industry, coherent light detection technology is gradually replacing the traditional direct detection technology. From a technical point of view, coherent optical detection technology has higher spectral efficiency, higher receiving sensitivity, and stronger linear distortion compensation capability than direct detection technology. Therefore, in optical backbone network transmission applications, the 100-Gb / s DP-QPSK (Duel Polarization Quadratic Phase Shift Keying) scheme based on coherent detection has been unanimously recognized by the industry. However, in other applications, such as optical access network applications, the cost of this technical solution is relatively high, so a low-cost coherent solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J14/02H04B10/64
Inventor 胡荣杨奇余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
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