Method and system for providing a return path for signals generated by legacy video service terminals in an optical network

• US 20050125837A1
• Filed: 12/06/2004
• Published: 06/09/2005
• Est. Priority Date: 07/05/2001
• Status: Active Grant

• Current Assignee: ARRIS Solutions, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Wave7 Optics, Inc. (Enablence Technologies Incorporated)
• Inventors: Thomas, Stephen, Quinn, Patrick, Farmer, James, Anthony, Deven
• Granted Patent: US 7,877,014 B2
• Time in Patent Office: Days
• US Class Current: 725/105
• CPC Class Codes: H04J 14/0226 Fixed carrier allocation, e.g. according to service
• CPC Class Codes: H04J 14/0232 for downstream transmission
• CPC Class Codes: H04J 14/0238 Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
• CPC Class Codes: H04J 14/0247 Sharing one wavelength for at least a group of ONUs
• 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 14/028 WDM bus architectures
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 14/0286 WDM hierarchical architectures
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]
• CPC Class Codes: H04N 21/4402 involving reformatting operations of video signals for household redistribution, storage or real-time display details of conversion of video standards at pixel level H04N7/01; video transcoding H04N19/40; adapting incoming signals to the display format of the display terminal G09G5/005; media handling at the source in data packet switching networks H04L65/764
• CPC Class Codes: H04N 21/6168 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 7/17309 Transmission or handling of upstream communications
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 11/0071 Provisions for the electrical-optical layer interface

Abstract

A return path system includes inserting RF packets between regular upstream data packets, where the data packets are generated by communication devices such as a computer or internet telephone. The RF packets can be derived from analog RF signals that are produced by legacy video service terminals. At a data service hub, a digitized-RF-to-packet converter (DRPC) can convert the RF packets into standard sized packets such as Ethernet packets for processing by a video services controller. In this way, the present invention can provide an RF return path for legacy terminals that shares a return path for regular data packets in an optical network architecture.

Claims

1. A return path of an optical network system comprising:

a video services controller for generating downstream RF modulated signals that are converted to the optical domain, the video services controller being disposed at a first site; and

a device for converting digitized, upstream, RF return packets to standard sized packets, the device being coupled to the video services controller and disposed at the first site.

2. The return path of claim 1, further comprising an switch for separating upstream digitized RF packets from upstream data packets.

3. The return path of claim 1, further comprising at least one subscriber optical interface for receiving RF-modulated signals, for converting the RF-modulated signals to first RF packets and combining the first packets with second packets for upstream transmission towards a data service hub comprising the video services controller.

4. The return path of claim 3, wherein the subscriber optical interface further reduces a size of the first packets.

5. The return path of claim 3, wherein the subscriber optical interface comprises a data reducer for adjusting a size of the first packets.

6. The return path of claim 3, wherein the subscriber optical interface splits the first digital data packets into first and second data streams.

7. The return path of claim 6, wherein the subscriber optical interface mixes the first data stream down to a zero frequency.

8. The return patch of claim 1, further comprising one or more optical waveguides connected to a data service hub comprising the video services controller, for carrying upstream optical signals and downstream optical signals.

9. The return path of claim 1, further comprising a laser transceiver node for communicating optical signals to a data service hub comprising the video services controller, and for apportioning bandwidth between subscribers of the optical network system.

10. The return path of claim 1, further comprising a data service hub for housing the video services controller, the data service hub receiving first packets comprising the digitized RF packets the second packets comprising data other than RF-modulated signals.

11. The return path of claim 1, wherein video services controller support a time division multiple access (TDMA) protocol.

12. A method for providing a return path for signals in an optical network system comprising the steps of:

receiving RF-modulated signals;

converting the RF-modulated signals to a first digital information packet comprising RF modulated information;

receiving a plurality of second digital information packets;

transmitting the first and second digital information packets by inserting the first digital information packet between the second digital information packets;

propagating the packets towards a data service hub;

receiving the first and second digital information packets at the data service hub; and

converting the first digital information packets to third digital information packets by removing the RF modulation, the third digital information packets comprising a standard packet format.

13. The method of claim 12, wherein the step of receiving the plurality of second digital information packets, further comprises receiving the plurality of second digital information packets from one of a computer and an internet telephone.

14. The method of claim 12, wherein converting the first digital information packets to third digital information packets comprises converting the first digital information packets to Ethernet formatted packets.

15. The method of claim 12, further comprising the step of splitting the first digital data packets into first and second data streams.

16. The method of claim 15, further comprising the step of mixing the first data stream down to a zero frequency.

17. The method of claim 15, further comprising the steps of:

determining a control word for a phased locked loop;

loading the control word into the phased locked to set a frequency of an oscillator.

18. A method for returning RF signals to a data service hub overall an optical network comprising:

receiving modulated RF signals;

converting the modulated RF signals into a plurality of first packets;

receiving a plurality of second packets;

combining the first packets with the second packets;

propagating the combined packets towards the data service hub and

changing a format of the first packets from a first format to a second format by demodulating the RF signals from the first packets.

19. The method of claim 18, wherein the second format comprises a format based upon an Ethernet format.

20. The method of claim 18, further comprising reducing the amount of data contained in the RF signals.