A Passive Optical Network Uplink Transmission System Based on Interleaved Frequency Division Multiple Access

Abstract

The invention discloses a passive optical network uplink transmission system based on interleaved frequency division multiple access, belonging to the optical communication field. The system comprises an ONU (Optical Network Unit) end and an OLT (Optical Line Terminal) end connected with each other by an optical fiber network. The system is characterized in that the ONU end comprises an IFDMA (Interleaved Frequency Division Multiple Access) baseband signal generating module used for generating a baseband IFDMA signal by using a signal of the user, wherein the signal output by the IFDMA baseband signal generating module is transmitted to an electro-optic modulation module via an up-converter module and a filtering module in sequence; the OLT end comprises an IFDMA baseband signal demodulation module used for demodulating the user signal from the baseband IFDMA signal; and an OLT end photoelectric conversion module is used for processing the output signal by a down-converter module and a filtering module in sequence and them transmitting the processed signal to the IFDMA baseband signal demodulation module. Compared with the prior art, the passive optical network uplink transmission system based on the interleaved frequency division multiple access, disclosed by the invention, can keep the signal PAPR (Peak-to-Average Power Ratio) to be very small so that the requirements on linear operations of a demodulator and a power amplifier are reduced; moreover, the complicatedness of a transmitter is low so that the cost of ONU end photoelectric appliances is effectively reduced.

Description

technical field [0001] The invention relates to a passive optical network uplink transmission system, in particular to an interleaved frequency division multiple access (IFDMA) based passive optical network uplink transmission system, which belongs to the field of optical communication. Background technique [0002] Introduction to some terms and their abbreviations commonly used in this field: Passive Optical Network (PON), Optical Distribution Network (ODN), Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Interleaved Frequency Division Multiple Access (IFDMA). [0003] In 2009, the Nobel Prize Committee of the Royal Swedish Academy of Sciences announced that it would award the 2009 Nobel Prize in Physics to a Hong Kong scientist, Charles K. Kao, and two American scientists. Scientist Charles K. Kao was awarded for his "groundbreaking achievements in the transmission of light in the field of optical communications."...

AI Technical Summary

Problems solved by technology

The advantage of WDM-PON is that it can achieve a higher working bandwidth, and has certain advantages in network management and system upgrades, but its disadvantage is that the cost is high, and there is still a long distance from industrialization and large-scale application.

[0019] To sum up, the current PON is mainly TDM-PON, which only needs to map the user's signal in the uplink system before it can be sent out, but each user's signal can only be sent in the specified time slot, and it needs burst However, due to the use of high-speed burst mode transceivers and optical splitters, the rate is limited and cannot meet the exponentially growing bandwidth requirements.

WDM-PON can achieve high bandwidth, but it requires multiple lasers at the ONU end, and wavelength management is also required, and the cost is too high

Images