Method and system for adopting colourless and nonluminous optical network units in optical access network

Abstract

The invention provides a method and system for adopting colourless and nonluminous optical network units in an optical access network. The method comprises the steps that a binary downlink original signal and an uplink seed signal orthorhombic with the downlink original signal are overlapped together on an optical line terminal and modulated to a light carrier, then the modulated downlink combined optical signal is transmitted to the optical network units, and the optical network units do not comprise a light source; the optical network units receive the downlink combined optical signal, the signal is processed, and the downlink original signal is obtained; a binary uplink original signal is modulated to the downlink combined optical signal through the optical network units, and the modulated uplink modulation signal is transmitted to the optical line terminal; the optical line terminal receives the uplink modulation signal from the optical network units, and then the uplink original signal is restored. The same wavelength light source is adopted in the downlink signal and the uplink signal. The downlink signal does not need to be wiped, and when the uplink signal is received, frequency beating noise caused by rayleigh scattering can be eliminated.

Description

technical field [0001] The present invention relates to an optical access method and system, in particular to a method and system for using a colorless and lightless optical network unit in an optical access network. Background technique [0002] In recent years, Passive Optical Network (PON) technology has been widely considered as the best strategy to solve broadband optical access needs due to its advantages of high bandwidth, low cost, simple maintenance, and good reliability, and has been widely used in the world. widely used in the world. The passive optical network includes three parts: Optical Line Terminal (Optical Line Terminal, OLT), Optical Division Node (Optical Division Node, ODN), and Optical Network Unit (Optical Network Unit, ONU). The entire network is a two-way optical fiber transmission system in which one OLT corresponds to multiple ONUs. Among them, the ONU is set at the user end, facing a large number of access users, so the cost is low, easy to oper...

AI Technical Summary

Problems solved by technology

This kind of gain saturation reflective semiconductor optical amplifier RSOA, and let RSOA work in the gain saturation region, requires the RSOA to have a special structure like this, at the same time, the RSOA must work in the gain saturation region, which will inevitably reduce the working life and modulation rate of the RSOA, making At present, the commercial modulation rate of RSOA is only 1.25Gb / s, which cannot realize the transmission of symmetrical PON

Images