Channel map for optical network unit activation and rogue behavior prevention

Patent metadata

Field	Value
Publication number	US-2016006608-A1
Application number	US-201414770799-A
Country	US
Kind code	A1
Filing date	Feb 26, 2014
Priority date	Feb 26, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A multi-wavelength passive optical network (MW-PON) includes an optical distribution network (ODN), a plurality of optical line terminations (OLTs) and an optical network unit (ONU). The ODN includes a trunk fiber, one or more branching elements, and a plurality of distribution fibers. Each OLT is associated with an individual bi-directional wavelength channel using a corresponding single downstream wavelength and a corresponding single upstream wavelength, and supporting a specific downstream line rate and one or more distinct upstream line rates. The ONU is communicatively coupled to a respective distribution fiber, being tunable over a specific range of downstream wavelengths and a specific range of upstream wavelengths, and supporting a specific downstream line rate and a specific upstream line rate. The OLT is configured to assemble a broadcast management message conveying information about bi-directional wavelength channels in said MW-PON system and transmit said message downstream over the associated bi-directional wavelength channel.

First claim

What is claimed is:

1 . A multi-wavelength passive optical network (MW-PON) system comprising:
an optical distribution network (ODN) comprising a trunk fiber, one or more branching elements coupled to the trunk fiber, and a plurality of distribution fibers coupled to the one or more branching elements; a plurality of optical line terminations (OLTs) communicatively coupled to the trunk fiber, each OLT being associated with an individual bi-directional wavelength channel using a corresponding single downstream wavelength and a corresponding single upstream wavelength, and supporting a specific downstream line rate and one or more distinct upstream line rates; a wavelength multiplexor (WM) coupled between the OLTs and the trunk fiber direct light between the OLTs and the trunk fiber; and a plurality of optical network units (ONUs), each ONU being communicatively coupled to a respective distribution fiber, being tunable over a specific range of downstream wavelengths and a specific range of upstream wavelengths, and supporting a specific downstream line rate and a specific upstream line rate; wherein each OLT is configured to:
assemble a broadcast management message conveying information about bi-directional wavelength channels in the MW-PON system; and
transmit the broadcast management message downstream over the associated bi-directional wavelength channel.

2 . The MW-PON system of claim 1 , wherein at least one of the ONUS is configured to receive, process, store, and update a local copy of the information conveyed by the broadcast management message.

3 . The MW-PON system of claim 1 , wherein the downstream broadcast management messages convey information on a number of supported wavelength channels.

4 . The MW-PON system of claim 1 , wherein the downstream broadcast channel map management messages convey information on the operational upstream and downstream wavelengths for each supported bi-directional wavelength channel.

5 . The MW-PON system of claim 1 , wherein the downstream broadcast channel map management messages convey information on the upstream and downstream line rates, for each supported bi-directional wavelength channel.

6 . The MW-PON system of claim 1 , wherein the downstream broadcast channel map management messages provide an indication for each supported bi-directional wavelength channel, whether the ONU activation procedure is supported on that channel.

7 . A method of activating an optical network unit (ONU) in an optical domain network (ODN), comprising:
operating the ONU to perform a tuning range scanning, a channel map acquisition, a parameter learning, a discovery, and a ranging, wherein the content of the parameter learning, discovery, and ranging is largely identical to the content of the respective activation phase in a conventional single-channel PON system such as G.984 G-PON or G.987 XG-PON.

8 . The method of claim 7 , wherein the tuning range scanning comprises the ONU operation of scanning through the supported range of downstream wavelengths in the search for an initialization channel, said initialization channel being a bi-directional wavelength channel where a downstream signal is present whose protocol and downstream line rate matches the supported protocol and downstream line rate of the ONU.

9 . The method of claim 8 , wherein the channel map acquisition phase contains the ONU operation of receiving and processing the channel map messages with the goal of finding at least one valid activation channel and determining whether the initialization channel is a valid activation channel; a valid activation channel being a bi-directional wavelength channel whose downstream and upstream wavelengths are within the respective tuning ranges of the ONU, whose protocol and downstream line rate matches the supported protocol and downstream line rate of the ONU, whose supported upstream line rates include the supported line rate of the ONU, and on which the activation procedure is supported.

10 . The method of claim 9 , wherein the channel map acquisition phase further comprises a decision step, which verifies whether the initialization channel is a valid activation channel and which, if it is not the case, includes retuning to a valid activation channel.

11 . A method implemented at an optical network unit (ONU) for joining an optical distribution network (ODN), comprising:
tuning to a channel; attempting to receive a channel map message on the tuned channel, the channel map message comprising information about an activation channel; tuning, when the received channel map message includes information about a compatible activation channel, to the compatible activation channel; and acquiring channel map message and a profile on the compatible activation channel.

12 . An optical network unit (ONU) operable to join an optical distribution network (ODN), comprising:
a tunable receiver that tunes in a tunable channel range to a channel; means for receiving a channel map message on the tuned channel, the channel map message comprising information about an activation channel; means for tuning, when the received channel map message includes information about a compatible activation channel, to the compatible activation channel; and means for acquiring channel map message and a profile on the compatible activation channel.

13 . An optical network unit, comprising:
a tuner module that tunes to a working optical channel; a channel map receiver module that attempts to receive a channel map message on the tuned channel, the channel map message comprising information about an activation channel; an activation channel module that tunes, when the received channel map message includes information about a compatible activation channel, to the compatible activation channel; and a parameter acquisition module that acquires channel map message and a profile on the compatible activation channel.

14 . An optical communication equipment for operation in an optical communication network, comprising:
a channel map module configured to generate a channel map for inclusion in a channel map message, the channel map listing activation channels available in the optical communication network; and a channel map transmitter configured to periodically transmit the channel map message in a downstream direction in the optical communication network.

Assignees

• Zte Corp
• Zte Usa Inc

Inventors

• Khotimsky Denis Andreyevich
• Geng Dan
• Zhang Dezhi
• Yuan Liquan

Classifications

• H04J14/0246

  using one wavelength per ONU · CPC title

• H04Q2011/0079

  Operation or maintenance aspects · CPC title

• H04Q2011/0086

  Network resource allocation, dimensioning or optimisation · CPC title

• H04L41/0806 Primary

  for initial configuration or provisioning, e.g. plug-and-play · CPC title

• H04J2014/0253

  Allocation of downstream wavelengths for upstream transmission · CPC title