Multi-port accumulator for radio-over-fiber (RoF) wireless picocellular systems

• US 8,867,919 B2
• Filed: 01/27/2012
• Issued: 10/21/2014
• Est. Priority Date: 07/24/2007
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Logan, Eric Raymond
• Primary Examiner(s): Liu, Li
• Application Number:
  US13/360,204
• Publication Number:
  US 20120121270A1
• Time in Patent Office: 998 Days
• US Class Current: 398/116
• CPC Class Codes: H04B 10/25754 Star network topology
• CPC Class Codes: H04B 10/808 Electrical power feeding of an optical transmission system
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A multi-port accumulator apparatus for a radio-over-fiber (RoF) wireless picocellular system comprising a housing supporting a tail cable port and transponder ports. The tail cable port is optically coupled to the RoF transponder ports to provide for transmission of uplink and downlink optical signals between the tail cable port and each of the transponder ports. The tail cable port is also electrically coupled to provide power to each transponder port. The multi-port accumulator supports RoF transponders, one at each of the transponder ports. Each RoF transponder includes a directional antenna system forming a picocellular coverage sub-area, with the combined sub-areas constituting a picocellular coverage area for the multi-port accumulator. The multi-port accumulator permits quick installation and deployment of large numbers of RoF transponders without individually connecting each RoF transponder to downlink and uplink optical fibers in an optical fiber RF communication link.

Claims

1. A radio over fiber (RoF) wireless picocellular system, comprising:

a head-end unit configured to be operably connected to an outside network and receive downlink signals from the outside network;

a plurality of tail cables, each of the tail cables comprising a plurality of optical fibers;

a distribution unit optically coupled to the head-end unit via a primary optical fiber RF communications link, the distribution unit configured to divide the primary optical fiber RF communication link into the plurality of tail cables and direct the downlink signals onto the tail cables;

a plurality of multi-port accumulators, each of the plurality of multi-port accumulators receiving a respective tail cable among the plurality of tail cables, and each of the plurality of multi-port accumulators comprising at least two transponders, each transponder configured to direct uplink and downlink signals,

wherein each of the at least two transponders is coupled to the primary optical fiber RF communication link via at least two of the plurality of optical fibers in the respective tail cable, and each of the at least two transponders and is configured to form a picocell coverage area and to wirelessly communicate with a client device within the picocell coverage area using the uplink and downlink signals; and

wherein each multi-port accumulator among the plurality of multi-port accumulators further comprises;

a housing including a plurality of sidewalls, at least a portion of the plurality of sidewalls includes a plurality of transponder connector ports, and a tail cable port configured to be optically and electrically coupled to one of the plurality of tail cables, such that individual optical fibers of the plurality of optical fibers in each tail cable are coupled from the tail cable port to respective transponder connector ports; and

wherein the at least two transponders for each multi-port accumulator among the plurality of multi-port accumulators are each optically and electrically connected to one of the plurality of transponder connector ports for the respective multi-port accumulator.

2. The system of claim 1, wherein the head-end unit comprises:

a service unit electrically coupled to an electrical-to-optical converter; and

the electrical-to-optical converter configured to receive downlink electrical RF service signals from the service unit and to convert the downlink electrical RF service signals to corresponding downlink optical RF service signals carried on the primary optical fiber RF communication link.

3. The system of claim 2, wherein the head-end unit further comprises a RF signal modulator/demodulator unit configured to generate a RF carrier signal of a given frequency and to modulate the downlink electrical RF service signals onto the RF carrier signal.

4. The system of claim 3, wherein the head-end unit further comprises a central processing unit (CPU) system, the CPU system configured to instruct the RF signal modulator/demodulator unit to create RF carrier signals at different frequencies for the RE service signals to be modulated onto the RF carrier signal.

5. The system of claim 2, wherein the distribution unit is configured to receive the downlink optical RF service signals from the head-end unit, and direct the downlink optical RF service signals to at least one of the plurality of multi-port accumulators.

6. The system of claim 1, wherein the head-end unit comprises:

a service unit electrically coupled to an optical-to-electrical converter; and

the optical-to-electrical converter configured to receive uplink optical RF service signals from the plurality of multi-port accumulators and to convert the uplink optical RF service signals to corresponding uplink electrical RF service signals provided to the service unit.

7. The system of claim 6, wherein the distribution unit is configured to receive the uplink optical RF service signals from at least one of the plurality of multi-port accumulators over at least one tail cable among the plurality of tail cables, and direct the uplink optical RF service signal to the head-end unit over the primary optical fiber RF communications link.

8. The system of claim 1, wherein the distribution unit comprises a plurality of mating connector sockets, wherein each of the plurality of the tail cables includes a connector plug removably connected to one of the plurality of mating connector sockets.

9. The system of claim 1, wherein the head-end unit is configured to receive power from a power unit, and each of the plurality of multi-port accumulators is configured to receive at least a portion of the power from the head-end unit to provide the at least portion of the power to the at least two transponders.

10. The system of claim 1, wherein the primary optical fiber RF communications link comprises at least one uplink optical fiber;

at least one downlink optical fiber; and

at least one electric power line.

11. The system of claim 1, wherein each of the plurality of tail cables is optically and electrically coupled to at least one of the plurality of multi-port accumulators.

12. The system of claim 1, wherein each of the plurality of multi-port accumulators is optically and electrically coupled in parallel to the distribution unit via the plurality of tail cables.

13. The system of claim 1, wherein each of the at least two transponders comprises:

an antenna system configured to wirelessly communicate with the client device; and

a converter pair unit configured to convert optical information from the head-end unit to electrical information for the antenna system.

14. The system of claim 1, wherein each of the at least two transponders is free from digital information processing capability.

15. The system of claim 1, wherein each of the at least two transponders is removably connected to one of the plurality of transponder connector ports with a connector.

16. The system of claim 1, wherein the each of the multi-port accumulators further comprises respective two or more internal electrical power line sections disposed within the housing, wherein the respective two or more internal electrical power line sections electrically couple the tail cable port to the plurality of transponder connector ports.

17. A method of establishing a wireless connection between a network and a client device, comprising:

operably connecting a head-end unit to an outside network;

optically coupling a distribution unit to the head-end unit via a primary optical fiber RF communications link, the distribution unit dividing a primary optical fiber RF communication link into a plurality of tail cables, each of the plurality of tail cables comprising a plurality of individual optical fibers;

receiving a respective tail cable of the plurality of tail cables at one of the plurality of multi-port accumulators, each of the plurality of multi-port accumulators including at least two transponders, each transponder configured to direct uplink and downlink signals;

coupling each of the at least two transponders to the primary optical fiber RF communications link through individual optical fibers in the respective tail cable;

forming a picocell coverage area with each of the at least two transponders to wirelessly communicating with a client device within the picocell coverage area;

optically and electrically coupling the at least two transponders of each multi-port accumulator among the plurality of multi-port accumulators to corresponding ones of a plurality of transponder connector ports for the respective multi-port accumulator;

optically and electrically coupling one of the plurality of tail cables to a tail cable port of each multi-port accumulator among the plurality of multi-port accumulators; and

wherein the each of the plurality of multi-port accumulators comprises a housing including a plurality of sidewalls at least a portion of the plurality of sidewalls includes the plurality of transponder connector ports and the tail cable port.

18. The method of claim 17, further comprising:

electrically coupling a service unit of the head-end unit to an electrical-to-optical converter of the head-end unit; and

receiving downlink electrical RF service signals with the electrical-to-optical converter from the service unit; and

converting the downlink electrical RF service signals to corresponding downlink optical RF optical signals to be carried on the primary optical fiber RF communications link.

19. The method of claim 17, further comprising:

electrically coupling a service unit of the head-end unit to an optical-to-electrical converter of the head-end unit; and

receiving uplink optical RF service signals with the optical-to-electrical converter from the primary optical fiber RF communications link; and

converting the uplink optical RF service signals to corresponding uplink electrical RF optical signals for the service unit.

20. The method of claim 17, further comprising removably connecting a connector plug of each of the plurality of tail cables into a corresponding one of a plurality of mating connector sockets of the distribution unit.