Filter bank multi-carrier passive optical network transmission system and method for sharing laser source

Abstract

The invention relates to a filter bank multi-carrier passive optical network transmission system and method of a shared laser source. Through a mode of sharing a light source for different frequency bands, interference of laser fluttering on frequency band intervals is avoided. When the asynchronous frequency bands using the same light source flutter at the frequency of the laser, the asynchronous frequency bands have common frequency spectrum position fluttering, so that the frequency fluttering of the laser cannot cause frequency band aliasing and crosstalk, and a protection interval does not need to be reserved for the fluttering of the laser. Compared with an OFDM signal, the FBMC signal is used, so that out-of-band leakage is greatly reduced, the required frequency spectrum protection interval is further reduced, and the frequency spectrum efficiency is greatly enhanced; the high bandwidth of the single wavelength is allocated through frequency division multiplexing, a GHz-level frequency band is provided for a user to use high-order modulation, the problem of minimum interval of wavelength division multiplexing does not exist, and the spectrum allocation flexibility is greatly enhanced; according to the invention, no long-distance back transmission of laser signals is realized, and only short-distance back transmission is realized, so that the need of laser signal amplification and reduction of the optical signal-to-noise ratio of more laser signals are avoided.

Description

technical field [0001] The present invention relates to the technical field of optical communication, and more particularly, to a filter bank multi-carrier passive optical network transmission system and method for sharing a laser source. Background technique [0002] Wavelength division multiplexed filter bank multi-carrier (Filterbank Multicarrier, FBMC) passive optical network (Passive Optical Network, PON) uplink architecture: The architecture is as follows figure 1 shown. The architecture is to allocate different frequency bands of the available bandwidth to the Optical Network Unit (ONU). The wavelength division multiplexed FBMC-PON allocates a laser source to each user, and the laser source passes through a Polarization Controller (PC). Input to Mach-Zehnder modulator (MZM). Each laser source works at different wavelengths at a certain wavelength interval (denoted as λ 1 ~λ W ), the wavelength separation is large enough to avoid spectral aliasing of different user...

AI Technical Summary

Problems solved by technology

In this way, although the different frequency bands of OFDM are guaranteed to be integer multiples of the subcarrier spacing, there are different transmission distances between different users. When the relative delay exceeds the CP length, the orthogonality of OFDM will still be destroyed. Therefore, this technology is implemented in Requires extra time to work synchronously, and consumes more devices and energy for this

In addition, due to the need for the laser signal to go from the OLT to the ONU through a long-distance optical fiber, usually tens of kilometers of backhaul and the use of RSOA amplification in the ONU, the decrease in the optical signal-to-noise ratio of the laser signal during transmission and amplification will lead to a decrease in system transmission performance.

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