WDM-PON system comprising remote bidirectional hybrid amplifier

Abstract

The invention provides a WDM-PON system comprising remote bidirectional hybrid amplifier. The PON system comprises an OLT, a transmission optical fiber, a bidirectional dual-band erbium-doped opticalfiber amplifier and an ONU, wherein the OLT comprises an OLT end signal transmitting end, an OLT end branching and combining device, a first optical fiber circulator, an OLT end signal receiving end,a remote pumping source and a signal pumping and combining device; the bidirectional dual-band erbium-doped optical fiber amplifier comprises a second optical fiber circulator, a first erbium-doped optical fiber, a third optical fiber circulator, a second erbium-doped optical fiber, a first light reflector and a second light reflector, wherein the ONU comprises an ONU end wave splitter / combiner and one or more ONU units; the ONU unit comprises a fourth optical fiber circulator, an ONU end signal receiving end and an ONU end signal transmitting end. According to the invention, only one pumpingsource (two pumping lasers) is adopted to realize the amplification of uplink and downlink signal light with different wave bands, the residual pumping light is fully utilized, and the transmission distance of WDM-PON system is prolonged.

Description

technical field [0001] The invention relates to an optical amplifier, especially a WDM-PON system including a remote bidirectional hybrid amplifier. Background technique [0002] PON (passive optical network) passive optical access network saves device cost and labor installation cost because there is no active optical device in the line. However, with the increase of the transmission distance and the number of users, the fiber loss and the insertion loss of the device will bring power damage to the system (Power Penalty), so an amplifier needs to be added to the system. [0003] In recent years, Raman amplifiers and remote pump amplifiers have been applied in ultra-long-distance unrepeated transmission systems to improve the power budget of the system. The remote remote pump amplifier is placed in the middle of the line to amplify the weak signal, which can improve the optical signal-to-noise ratio of the receiving end, thereby improving the sensitivity of the receiver. T...

AI Technical Summary

Problems solved by technology

For WDM-PON systems, the transmission distance from OLT to ODN is generally only 20-40km. If Raman amplification is used, the Raman pump light can be located in the OLT equipment room, but because of the short transmission distance, the pump light still has A large amount of residual pump light needs to be separated from the signal, otherwise it will become noise and affect the transmission of signal light

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