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wdm PON with non-tunable legacy onu

A wavelength range and optical line terminal technology, applied in the field of optical transmission systems, can solve the problems of non-tunable lasers that cannot be used, uncontrolled wavelengths, and drift

Inactive Publication Date: 2016-03-09
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-tunable conventional lasers generally cannot be used in such WDMPONs because their wavelength is not controlled and will therefore drift due to temperature changes
Therefore, non-tunable lasers of traditional ONUs installed at customer premises cannot be used in WDMPON

Method used

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  • wdm PON with non-tunable legacy onu
  • wdm PON with non-tunable legacy onu
  • wdm PON with non-tunable legacy onu

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Embodiment Construction

[0024] Typically, a PON is a point-to-multipoint, fiber-to-the-premises network architecture in which unpowered passive optical splitters are used to enable a single optical fiber to serve multiple premises, typically 32 to 128. A PON comprises a plurality of Optical Network Units (ONUs) or Optical Network Terminals (ONTs) located near the Optical Line Termination or Terminal (OLT) of the service provider's central office and the end users. Compared to point-to-point (PTP) architectures, PON configurations reduce the amount of fiber and central office equipment required.

[0025] Downstream signals in a PON are broadcast to each premises sharing a single feeder fiber. The upstream signals are combined using a Time Division Multiple Access (TDMA) based Medium Access Control (MAC) protocol. The OLT configures the served ONT or ONU to provide time slot allocation for upstream communication.

[0026] figure 1 The figure shows an example PON network 100 having an Optical Networ...

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Abstract

This document relates to optical transmission systems. In particular, this document relates to a system and method for enabling coexistence of tunable and non-tunable optical network units (ONUs) in a passive optical network (PON), such as a wavelength division multiplexed (WDM) PON. A media access controller for a passive optical network (200) is described. The passive optical network (200) comprises: a first optical line terminal (201) having a receiver for a first wavelength range; a second optical line terminal (202) having a receiver for a second wavelength range, the A second wavelength range is adjacent to the first wavelength range; and an optical network unit (101) having a transmitter having a transmitter wavelength shifted between the first and second wavelength ranges. The media access controller is adapted to distribute the optical network unit (101) to the first optical line terminal (201) and the second optical line terminal (202) such that optical bursts emitted by the optical network unit (101) are transmitted by the first The optical line terminal (201) and the second optical line terminal (202) receive.

Description

technical field [0001] This document relates to optical transmission systems. In particular, this document relates to a system and method for enabling coexistence of tunable and non-tunable optical network units (ONUs) in a passive optical network (PON), such as a wavelength division multiplexed (WDM) PON. Background technique [0002] For WDMPON, tunable lasers are used within ONUs and optical line terminals (OLTs) to tune the transmitter wavelength to the passband of a specific optical filter. Non-tunable conventional lasers generally cannot be used in such WDMPONs because their wavelength is not controlled and will therefore drift due to temperature changes. Therefore, non-tunable lasers of conventional ONUs installed at customer premises cannot be used in WDMPON. In this document, methods and systems are described for enabling the use of non-tunable lasers, ie uncontrolled emitters, within a WDMPON. Contents of the invention [0003] According to one aspect, a media...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H01S5/00
CPCH01S5/0014H01S5/0607H04J14/0282H04J14/02216H04J14/0307H01S5/00H04B10/07
Inventor W·珀尔曼T·普法伊费尔R·赫伦
Owner ALCATEL LUCENT SAS