Hybrid multiplexing passive optical communication method and hybrid multiplexing passive optical communication network

Abstract

The invention relates to a hybrid multiplexing passive optical network and a communication method thereof, which are characterized in that a pumping wave which can be used for four-wave mixing frequency is injected into an optical communication line; after carrying out wavelength division multiplexing (FWM), the pumping wave and a user terminal uplink optical signal are injected into a high non-linear optical fiber or a high non-linear photonic crystal optical fiber; the high non-linear optical fiber or the high non-linear photonic crystal optical fiber realizes the FWM between the pumping wave and the user terminal uplink optical signal and generates a wavelength conversion optical signal; and after passing through a wavelength division multiplexer, the wavelength conversion optical signal is transmitted to an optical line terminal, thereby realizing optical signal uplink communication and supporting the transmission of a plurality of time division multiplexing optical networks in a single optical fiber. The hybrid multiplexing passive optical communication network utilizes the FWM effect in the high non-linear optical fiber and the high non-linear photonic crystal optical fiber, has favorable compatibility with original ONU equipment and the passive characteristics of ODN, can realize the upgrading of the network without changing the ONU equipment and greatly reduce the reforming cost of the network.

Description

technical field [0001] The invention relates to the technical field of hybrid multiplexing passive optical network. Background technique [0002] Hybrid multiplexing passive optical network (HPON) combines power division passive optical network (also known as time division multiplexing passive optical network, namely TDM-PON) and wavelength division multiplexing passive optical network (WDM-PON). ), it has a series of advantages such as large single-fiber access capacity, low network construction cost, and easy operation, maintenance and upgrade. WDM technology is adopted in HPON to support the operation of multiple TDM-PONs of a single fiber. Since each TDM-PON needs to be allocated an uplink and downlink wavelength, the key to HPON technology is to avoid using expensive wavelength-selective optical devices in the user terminal (ONU) of each TDM-PON optical network. If fixed-type lasers used for dense wavelength division multiplexing (DWDM) transmission are used in the ON...

AI Technical Summary

Problems solved by technology

This solution helps to improve the power budget of the system, but requires the optical modulation device at the ONU side to be polarization-independent, which will increase the cost

Another key problem is the ODN topology of the single-fiber feeder of the conventional PON network. The OLT receiving end will seriously deteriorate the signal-to-noise ratio due to the coherent Rayleigh scattering of the seed light. The seed light and uplink modulated light are divided into fiber transmission, which will lead to a waste of fiber resources and an increase in maintenance costs, and is also very detrimental to the evolution of the system to the next-generation long-distance access network

[0004] Another disadvantage of the above solution is that it is not compatible with existing ONU equipment. Such ONUs mostly use uncooled FP-LD light sources, which will cause a waste of early equipment investment.

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