Hybrid WDM/TDM network architecture

• US 7,349,630 B2
• Filed: 05/21/2001
• Issued: 03/25/2008
• Est. Priority Date: 05/21/2001
• Status: Expired due to Fees

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Melaragni, William
• Primary Examiner(s): Sedighian, M. R.
• Application Number:
  US09/861,822
• Publication Number:
  US 20020171888A1
• Time in Patent Office: 2,500 Days
• Field of Search: 398/66, 398/67, 398/69, 398/71, 398/72, 398/58, 398/45, 398/49, 398/50, 398/54, 398/56, 398/75, 398/98, 398/99
• US Class Current: 398/75
• CPC Class Codes: H04J 14/0226 Fixed carrier allocation, e.g. according to service
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0238 Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/0252 Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

A method and apparatus for configuring a server/client network architecture. A server network device impresses an optical signal onto an optical link at a specified wavelength, where distinct wavelengths are associated with one or more of a plurality of client devices. Thus, the server addresses a specified client device, thereby polling the specified device for a response. An optical demultiplexer/combiner directs the server optical signal to the specified recipient client device on the basis of the wavelength of the server optical signal, and combines all responses on the client devices for transmission back to the server. Any transmission by the specified client device in response to polling by the server is thus received by the server.

Claims

1. An apparatus for coupling a first network device with a plurality of client network devices, the apparatus comprising:

an optical link;

a tunable light source for injecting an optical signal characterized by a carrier wavelength onto the optical link;

a demultiplexer/combiner for directing the optical signal to at least one specified client network device on the basis of the carrier wavelength of the optical signal and for directing optical signals from the plurality of client network devices to the first network device;

a combiner operable to time division multiplex the optical signals sent from the plurality of client network devices to the first network device; and

a switch coupled between the demultiplexer/combiner a client network devices for switching any output of the client network device back to the client network device unless the client network device is being addressed by the first network device.

2. The apparatus as defined by claim 1, wherein the tunable light source is a laser.

3. The apparatus as defined by claim 1, wherein the switch is an optical switch.

4. The apparatus as defined by claim 1, further including an optical power detector for detecting when a specified client network device is being addressed by the first network device.