Time synchronization method of access system of optical orthogonal frequency division multiplexing-based passive optical network (OOFDM-PON)

A passive optical network, OOFDM-PON technology, applied in the field of optical communication, can solve the problems of occupying large data processing resources, unreasonable, and occupying large resources

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A passive optical network, OOFDM-PON technology, applied in the field of optical communication, can solve the problems of occupying large data processing resources, unreasonable, and occupying large resources

CN101882968BInactive Publication Date: 2013-12-25UNIV OF ELECTRONICS SCI & TECH OF CHINA

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[0064] The method for applying the present invention to time synchronization in an OOFDM-PON access system will be further described in detail below in combination with specific implementation methods.

[0065] figure 1 is a schematic diagram of the time synchronization method in the OOFDM-PON system. The OOFDM-PON system is mainly composed of an optical line terminal (OLT) and a plurality of optical network terminals (ONU). OLT includes laser, OFDM signal generation module, modulator and optical multiplexer. ONU includes optical demultiplexer, time delay compensation, optical detector and OFDM receiving module. At the OLT end, it consists of two lasers, of which the No. 1 laser is used to modulate the optical OFDM data signal, denoted as A branch, wherein the OFDM signal is generated by the OFDM signal generation module; the other No. 2 laser is used to modulate the timing pulse signal, denoted For the B branch, the information of these two branches is multiplexed to the c...

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Abstract

The invention discloses a time synchronization method in a system of an optical orthogonal frequency division multiplexing-based passive optical network (OOFDM-PON). The scheme comprises an optical line terminal (OLT) and an optical network unit (ONU), wherein the OLT comprises a laser, a modulator, an OFDM signal generating module and an optical multiplexer. The ONU comprises an optical demultiplexer, a time delay compensator, an optical detector and an OFDM receiving module. At the transmitting end of the OLT, optical signals for modulating optical OFDM signals and timing information are divided into two branches. The optical signals are divided into two branches after transmitted by optical fibers, wherein a timing signal is extracted from the branch for carrying the timing information by the optical detector after time-delay compensation, and the OFDM signals are accurately received at the receiving end of the ONU. The invention has the characteristics of simple design principle, easy realization, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to an optical orthogonal frequency division multiplexing-based passive optical network (OOFDM-PON) access and time synchronization technology. Background technique [0002] Synchronization technology is one of the key technologies of Orthogonal Frequency Division Multiplexing (OFDM) communication system, and it is also the key technology of Optical Orthogonal Frequency Division Multiplexing (OOFDM) and Optical Orthogonal Frequency Division Multiplexing-based Passive Optical Network (OOFDM-PON). The key to the practicality of the access system. OOFDM-PON access is divided into two systems: coherent and non-coherent. Among them, the performance of the coherent OOFDM-PON access system is better, but it is difficult to implement and the cost is high; the non-coherent OOFDM-PON access technology uses direct modulation intensity detection. The implementation is ...

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Application Information

Patent Timeline

25 Dec 2013

Publication

CN101882968B

IPC: H04J3/06; H04L7/04; H04B10/25; H04Q11/00; H04L27/26

Inventors: 张崇富; 邱昆