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Wavelength router for a passive optical network

一种路由器、光网络单元的技术，应用在光波导光导、光波导的耦合、多路复用通信等方向，能够解决未充分开发网络协议和软件、高成本、不成熟装置技术等问题

Active Publication Date: 2014-07-16
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due in part to the higher cost of WDM-PON compared to conventional systems and in part to immature device technologies and underdeveloped network protocols and protocols to support the various commercially viable WDM-PON architectures software, WDM-PON has not been widely commercialized

Method used

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  • Wavelength router for a passive optical network
  • Wavelength router for a passive optical network
  • Wavelength router for a passive optical network

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Embodiment Construction

[0016] A conventional passive optical network (PON) is a point-to-multipoint, fiber-to-the-premises network architecture in which passive optical splitters that are not powered are used to enable a single optical fiber to serve multiple subscribers (typically 16-128). A typical PON consists of an Optical Line Terminal (OLT) at the service provider's Central Office (CO) and a number of Optical Network Units (ONUs) close to the end users. With the help of passive optical splitters, the optical carrier is shared by the ONUs. The downlink signal is broadcast to all ONUs. Uplink signals are routed using a multiple access protocol, typically Time Division Multiple Access (TDMA). PON advantageously reduces the amount of fiber and central office equipment, eg, compared to that required for point-to-point architectures. However, the number of ONUs in a conventional PON is limited by the system's optical power budget, which depends on fiber and component losses and attenuation by pas...

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Abstract

A passive arrayed-waveguide-grating (AWG) router that can be used to implement the dual functionality of a wavelength router and a 3-dB power splitter for one of its wavelength channels while functioning as a conventional wavelength router for the other wavelength channels. The passive AWG router can advantageously be used, e.g., in a WDM-PON system to reduce the insertion-loss disparity between the various wavelength channels that are being used to broadcast optical signals from an optical line terminal located at the service provider's central office, through the passive AWG router, to a plurality of optical network units located near the end users.

Description

technical field [0001] The present invention relates to optical communication devices, and more particularly (but not exclusively) to passive wavelength routers. Background technique [0002] This section introduces aspects that may help promote a better understanding of the invention. Therefore, the statements in this section should be read in this light and should not be construed as an admission of what is or is not prior art. [0003] The access network, also referred to as the "first mile network", connects a service provider's central office to business and residential subscribers. Access networks are also sometimes referred to in the literature as subscriber access networks or local loops. Bandwidth requirements in access networks have increased rapidly, for example, because residential subscribers expect high bandwidth from first mile access solutions and provide rich media services. Similarly, business users require a broadband infrastructure via which they can r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/12H04J14/02G02B6/34
CPCH04J14/0204
Inventor 彼得罗·A·G·贝尔纳斯科尼戴维·T·尼尔森
Owner ALCATEL LUCENT SAS
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