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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[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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