System and method for communicating optical signals between a data service provider and subscribers

• US 7,599,622 B2
• Filed: 08/03/2007
• Issued: 10/06/2009
• Est. Priority Date: 08/19/2004
• Status: Expired due to Fees

• Current Assignee: ARRIS Solutions, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Enablence USA Fttx Networks, Inc. (Enablence Technologies Incorporated)
• Inventors: Quinn, Patrick W., Farmer, James O., Kenny, John J., Vella, Emmanuel A., Tighe, Thomas A., Whittlesey, Paul F.
• Primary Examiner(s): Bello; Agustin
• Application Number:
  US11/890,277
• Publication Number:
  US 20080085117A1
• Time in Patent Office: 795 Days
• Field of Search: 398 66- 73
• US Class Current: 398/72
• 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 14/0269 using tables for routing
• 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]

Abstract

An optical fiber network can include an outdoor laser transceiver node that can be positioned in close proximity to the subscribers of an optical fiber network. The outdoor laser transceiver node does not require active cooling and heating devices that control the temperature surrounding the laser transceiver node. The laser transceiver node can adjust a subscriber'"'"'s bandwidth on a subscription basis or on an as-needed basis. The laser transceiver node can also offer data bandwidth to the subscriber in preassigned increments. Additionally, the laser transceiver node lends itself to efficient upgrading that can be performed entirely on the network side. The laser transceiver node can also provide high speed symmetrical data transmission. Further, the laser transceiver node can utilize off-the-shelf hardware to generate optical signals such as Fabry-Perot (F-P) laser transmitters, distributed feed back lasers (DFB), or vertical cavity surface emitting lasers (VCSELs).

Claims

1. An optical network system comprising:

a data service hub for sending downstream optical signals on an optical waveguide;

an optical tap for passively extracting and dividing downstream optical signals between a plurality of optical waveguides coupled to a plurality of subscriber optical interfaces, and the optical tap passively combining upstream optical signals received from one or more subscriber optical interfaces, the optical tap comprising an optical splitter, the optical tap passively extracting and dividing the downstream optical signals without any optical to electrical conversions, the optical tap passively combining the upstream optical signals without any optical to electrical conversions;

each subscriber optical interface providing electrical communications to a subscriber, each subscriber optical interface coupled to a respective optical tap by an optical waveguide, for receiving the downstream optical signals from a respective optical tap and converting the downstream optical signals into downstream electrical signals; and

a laser transceiver node disposed between the data service hub and the optical tap, for communicating a first set of optical signals to and from the data service hub and to and from a respective optical tap, for apportioning bandwidth that is shared between groups of subscriber optical interfaces connected to a respective optical tap, the laser transceiver node further comprising;

a plurality of optical transmitters and optical receivers;

a plurality of bi-directional splitters for receiving downstream and upstream optical signals, each bi-directional splitter coupled to a respective optical transmitter and a respective optical receiver;

an optical transceiver coupled to the optical waveguide for converting downstream optical signals from the optical waveguide into downstream electrical signals, for converting upstream electrical signals into optical signals;

a routing device coupled to each optical transmitter and the optical transceiver, for apportioning bandwidth in the electrical domain between subscribers and using a look-up table for processing both upstream and downstream electrical signals, for assigning downstream electrical signals received from the optical transceiver to predetermined optical transmitters, for combining upstream electrical signals from respective optical receivers into one electrical signal that modulates the optical transceiver, the laser transceiver node receiving a second set of downstream only optical signals comprising information from the data service hub and combining the second set of optical signals with the optical signals generated by the predetermined optical transmitters in an optical domain without any electrical conversion of the second set of optical signals.

2. The optical network system of claim 1, wherein the optical receivers convert upstream optical signals from a respective optical tap into upstream electrical signals.

3. The optical network system of claim 1, wherein the optical transmitters convert downstream electrical signals into downstream optical signals.

4. The optical network system of claim 1, wherein each subscriber optical interface receives upstream electrical signals from a subscriber and converts the upstream electrical signals into upstream optical signals and sends the upstream optical signals over an optical waveguide towards a corresponding optical tap.

5. The optical network system of claim 1, wherein each optical tap combines upstream optical signals received from a plurality of optical waveguides and propagates the combined upstream optical signals over a single optical waveguide.

6. The optical network system of claim 1, wherein the laser transceiver node accepts gigabit Ethernet optical signals from the data service hub and partitions the Ethernet optical signals into a predetermined number of groups.

7. The optical network system of claim 1, wherein each optical transmitter comprises one of a Fabry-Perot laser, a distributed feedback laser, and a vertical cavity surface emitting laser (VCSEL).

8. The optical network system of claim 1, wherein the optical tap routing device manages upstream and downstream data protocols.

9. The optical network system of claim 8, wherein one of the protocols comprises a time division multiple access protocol.

10. The optical network system of claim 1, wherein data bit rates for the upstream and downstream optical signals are substantially symmetrical.

11. An optical network system comprising:

an optical tap for passively extracting and dividing downstream optical signals between a plurality of optical waveguides coupled to a plurality of subscriber optical interfaces, and the optical tap passively combining upstream optical signals received from one or more subscriber optical interfaces, the optical tap comprising an optical splitter, the optical tap passively extracting and dividing the downstream optical signals without any optical to electrical conversions, the optical tap passively combining the upstream optical signals without any optical to electrical conversions;

each subscriber optical interface providing electrical communications to a subscriber, each subscriber optical interface coupled to a respective optical tap by an optical waveguide, for receiving the downstream optical signals from a respective optical tap and converting the downstream optical signals into downstream electrical signals; and

a laser transceiver node disposed between the data service hub and the optical tap, for communicating a first set of optical signals to and from the data service hub and to and from a respective optical tap, the laser transceiver node further comprising;

a plurality of optical transmitters and optical receivers;

a plurality of bi-directional splitters for receiving downstream and upstream optical signals, each bi-directional splitter coupled to a respective optical transmitter and a respective optical receiver;

an optical transceiver coupled to the optical waveguide for converting downstream optical signals from the optical waveguide into downstream electrical signals, for converting upstream electrical signals into optical signals;

a routing device coupled to each optical transmitter and the optical transceiver, for apportioning bandwidth in the electrical domain between subscribers and using a look-up table for processing both upstream and downstream electrical signals, for assigning downstream electrical signals received from the optical transceiver to predetermined optical transmitters, for combining upstream electrical signals from respective optical receivers and for modulating the optical transceiver, the laser transceiver node receiving a second set of downstream only optical signals comprising information from the data service hub and combining the second set of optical signals with the optical signals generated by the predetermined optical transmitters in an optical domain without any electrical conversion of the second set of optical signals.

12. The optical network system of claim 11, further comprising a data service hub for sending downstream optical signals on an optical waveguide.

13. The optical network system of claim 11, wherein the laser transceiver node apportions bandwidth that is shared between groups of subscriber optical interfaces connected to a respective optical tap.

14. The optical network system of claim 11, wherein the laser transceiver node combines the upstream electrical signals from respective optical receivers into one electrical signal that modulates the optical transceiver.

15. The optical network system of claim 11, wherein the optical tap routing device manages upstream and downstream data protocols.

16. A system for supporting optical communications comprising:

optical tap means for passively extracting and dividing downstream optical signals between a plurality of optical waveguides coupled to a plurality of subscriber optical interfaces, and the optical tap means passively combining upstream optical signals received from one or more subscriber optical interfaces, the optical tap means passively extracting and dividing the downstream optical signals without any optical to electrical conversions, the optical tap means passively combining the upstream optical signals without any optical to electrical conversions;

each subscriber optical interface providing electrical communications to a subscriber, each subscriber optical interface coupled to a respective optical tap by an optical waveguide, for receiving the downstream optical signals from a respective optical tap and converting the downstream optical signals into downstream electrical signals; and

a laser transceiver node means disposed between the data service hub and the optical tap, for communicating a first set of optical signals to and from the data service hub and to and from a respective optical tap, the laser transceiver node means further comprising;

a plurality of optical transmitters and optical receivers;

a plurality of bi-directional splitters for receiving downstream and upstream optical signals, each bi-directional splitter coupled to a respective optical transmitter and a respective optical receiver;

an optical transceiver coupled to the optical waveguide for converting downstream optical signals from the optical waveguide into downstream electrical signals, for converting upstream electrical signals into optical signals;

a routing device coupled to each optical transmitter and the optical transceiver, for apportioning bandwidth in the electrical domain between subscribers and using a look-up table for processing both upstream and downstream electrical signals, for assigning downstream electrical signals received from the optical transceiver to predetermined optical transmitters, the laser transceiver node means combining upstream electrical signals from respective optical receivers and for modulating the optical transceiver, the laser transceiver node receiving a second set of downstream only optical signals comprising information from the data service hub and combining the second set of optical signals with the optical signals generated by the predetermined optical transmitters in an optical domain without any electrical conversion of the second set of optical signals.

17. The system of claim 16, wherein the optical tap means comprises an optical splitter.

18. The system of claim 16, further comprising a data service hub for sending downstream optical signals on an optical waveguide to the optical tap means.

19. The system of claim 16, wherein the laser transceiver node means apportions bandwidth that is shared between groups of subscriber optical interfaces connected to a respective optical tap.

20. The system of claim 16, wherein the laser transceiver node means combines the upstream electrical signals from respective optical receivers into one electrical signal that modulates the optical transceiver.