System for realizing wavelength reuse of self-injection wavelength division multiplexing passive optical network and method thereof

Abstract

The invention relates to a system for realizing wavelength reuse of a self-injection wavelength division multiplexing passive optical network and a method thereof. The system is formed by an optical line terminal OLT connected with remote nodes RN through a feed fiber, and the remote nodes RN connected with a plurality of optical network units ONU, wherein 2n optical network units ONU are dividedinto a group I of the optical network units ONU and a group II of optical network units ONU, and the number of the optical network units ONU in each group is the same, while uplink signals and downlink signals of two groups of the optical network units ONU are just opposite and do not have interaction with each other; the remote nodes are connected with the two groups of the optical network unitsONU respectively and realize downlink signal separation, uplink signal combination and generation and return of seed light of the two groups of the optical network units ONU. The method realizes wavelength reuse by the system, divides the usable wave band into a wave band A and a wave band B, wherein the group I of the optical network units ONU carries the uplink signal and the seed light thereofby the wavelength of the wave band A, carries the downlink signal by the wavelength of the wave band B, while the group II of the optical network units ONU are just the opposite, thereby reusing the uplink signal and the downlink signal of the group I of the optical network units ONU by the group II of the optical network units ONU, not only avoiding that the seed light and the downlink signal cannot be separated by the optical network units ONU due to the fact that the seed light and the downlink signal are in the same wave band and are aliased with each other, but also realizing doubling ofthe number of the optical units ONU supported by the system and the wavelength utilization ratio.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a self-injection locking type wavelength division multiplexing passive optical network WDM-PON system and method capable of realizing wavelength reuse. Background technique [0002] Wavelength division multiplexing passive optical network WDM-PON technology can upgrade the bandwidth without changing the physical infrastructure equipment, greatly improve the transmission capacity of the network, and has broad application prospects in the optical access network. Compared with WDM-PON, which uses more external injection-locked wavelength division multiplexing passive optical network, self-injection-locked wavelength division multiplexing passive optical network WDM-PON does not need expensive external broadband light source, and its cost is relatively The wavelength of the uplink signal is no longer limited by the spectrum of the broadband light source, so its application range ...

AI Technical Summary

Problems solved by technology

In WDM-PON, the wavelength resources are very tight. Currently, the available wavelengths in the C-band are only 80 waves. However, the above-mentioned conventional self-injection WDM-PON needs to be Each optical network unit ONU is set with two wavelengths (uplink signal optical wavelength and downlink signal wavelength), so the network can support only 40 network unit ONUs, the network scale is severely limited, and the system wavelength utilization rate is also low

None of the existing solutions can solve the problems of low wavelength utilization of the system and too few optical network units (ONUs) that the network can support

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