TWDMPON (time and wavelength division multiplexed passive optical network) uplink solution based on tunable wave length converter and wave length sharing method

Abstract

The invention provides a TWDMPON uplink solution based on a tunable wavelength converter and a wavelength sharing method, comprising the tunable wavelength converter, a tunable optical filter and a circulator. The invention utilizes the tunable wavelength converter to uniformly convert an uplink time division multiplexed wavelength signal into a TWDM-PON system compatible wavelength signal, seamless compatibility of the TWDM-PON system and a traditional ONU (optical network unit) device is ensured, the outburst wavelength shift problem of the ONU is solved, and the layout cost of the ONU is effectively reduced.

Description

technical field [0001] The present invention relates to the field of optical communication, in particular to a transmission scheme of an uplink signal in a TWDM-PON system in the field of optical communication. Background technique [0002] The passive optical access network (TWDM-PON) based on time division and wavelength division multiplexing will be the technology choice of the communication industry in NG-PON2, that is, the next generation of optical fiber access, and the full-service access organization FSAN and the International Telecommunication Union ITU are Complete the standardization of TWDM-PON. A key requirement for NG-PON2 is how to retain operators' existing PON investment and allow them to use the original expensive network elements to achieve maximum compatibility with existing network components and terminal equipment. Therefore, whether TWDM-PON can be smoothly and gradually introduced into the existing FTTX optical fiber network determines the cost of co...

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Problems solved by technology

[0004] In the TWDM-PON system, the research and development of colorless ONU is very important, and the key of colorless ONU is that the optical transceiver has the ability to adjust the wavelength to select the most suitable wavelength channel. The wavelength tunable transceiver is a new technology , its implementation is complex and costly, especially in cost-sensitive ONUs, the cost of tunable transceivers is a serious problem

In addition, in the TWDM-PON system, the uplink signal is time-division multiplexed, and the uplink transmitter transmits in bursts. In the initial stage of burst transmission, the wavelength of the laser will drift due to sudden changes in current or temperature. However, this wavelength drift phenomenon will cause crosstalk between adjacent channels in a multi-wavelength multiplexing system, which is not allowed to exist

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