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

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2013-12-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Claims

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