TIME AND WAVELENGTH DIVISION MULTIPLEXING - PASSIVE OPTICAL NETWORK (TWDM-PON) SYSTEM AND COMMUNICATION LINK METHOD THEREOF

摘要

A Time Wavelength Division Multiplexing-Passive Optical Network (TWDM-PON) system and a communication link method thereof are provided. The communication link method is a method whereby an Optical Network Unit (ONU) which has established communication link to one Optical Line Terminal (OLT) establishes communication link to a different OLT. The ONU receives a wavelength change instruction to change a wavelength thereof to an operating wavelength assigned to the different OLT, and change the wavelength in response to the wavelength change instruction to synchronize to a downstream signal of the operating signal. In addition, the ONU receives an upstream discovery grant signal from the different OLT, and transmits an acknowledgement message to notify the receipt of the upstream discovery grant signal, so that the ONU establishes communication link to the different OLT.

主权项

1. A Time Wavelength Division Multiplexing-Passive Optical Network (TWDM-PON) system, comprising:
a service provider equipment configured to comprise a plurality of Optical Line Terminals (OLTs) and an OLT communicator, wherein each of the plurality of OLTs is configured to provide a service using an optical signal of a different wavelength in Time Division Multiplexing (TDM) scheme, and the OLT communicator is configured to support communication among the plurality of OLTs; a subscriber equipment configured to comprise a plurality of Optical Network Units (ONUs), each of the plurality of ONUs that utilizes a service provided from one of the plurality of OLTs using an arbitrary wavelength selected according to a wavelength control of the service provider equipment; and an Optical Distribution Network (ODN) configured to transmit multi-wavelength downstream optical signals from the service provider equipment to the subscriber equipment, and transmit multi-wavelength upstream optical signals from the subscriber equipment to the service provider equipment, wherein the plurality of OLTs comprises a first OLT and a second OLT, and a first ONU of the plurality of the ONUs, which have established communication link to the first OLT, establishes communication link to the second OLT.