Systems and methods for broadband transmission of signals
View Patent ↗Systems and methods which facilitate broadband transmission of signals using a delivery point tuning technique to provide a extended frequency passive optical network (EF-PON) are shown. Embodiments provide an extended frequency optical transition node (EF-OTN) at each of a plurality of delivery points to provide a frequency translation interface between equipment disposed at the delivery point locations and a network utilizing transmission bandwidth which is incompatible with that equipment. The foregoing frequency conversion is preferably transparent to the equipment receiving the network transmissions. Embodiments utilize a single wideband tuner for providing frequency conversion with respect to a plurality of equipment disposed a delivery point. Network head-end modulators are controlled to implement channel grouping such that the signals requested by each piece of subscriber equipment at a delivery point are placed within radio frequency (RF) channels so that each such signal is within the frequency converted band of an EF-OTN tuner.
1. A system comprising:
an extended frequency optical transition node having an optical interface adapted to couple to a fiber-optic cable transmission network link and a radio frequency (RF) interface adapted to couple to a subscriber site RF link, said extended frequency optical transition node having a tuner circuit operable to provide frequency translation of selected signals carried by said fiber-optic cable transmission network link modulated at frequencies outside of a tuning capability of subscriber equipment to frequencies within said tuning capability of said subscriber equipment,
wherein said subscriber equipment comprises equipment configured to operate with respect to a switched digital video (SDV) passive optical network (PON) having a transmission bandwidth of 1 GHz, and wherein said frequency translation of selected signals by said extended frequency optical transition node is transparent to said subscriber equipment.
2. The system of claim 1 , wherein said tuning capability of said subscriber equipment is 1 GHz or below, and wherein said frequencies outside of said tuning capability of said subscriber equipment are above 1 GHz.
3. The system of claim 1 , wherein said subscriber equipment comprises a set-top box.
4. The system of claim 1 , wherein said subscriber equipment comprises a television set.
5. The system of claim 1 , wherein said subscriber equipment comprises a cable modem.
6. The system of claim 1 , wherein said tuner circuit has a passband selected to be broad enough to pass a plurality of RF channels transmitted via said fiber-optic cable transmission network.
7. The system of claim 6 , wherein said passband is at least 100 MHz.
8. The system of claim 6 , wherein said plurality of RF channels is at least 4 RF channels.
9. The system of claim 1 , wherein said tuner circuit comprises a multi-conversion tuner circuit.
10. The system of claim 9 , wherein said multi-conversion tuner circuit comprises a double conversion tuner circuit.
11. The system of claim 9 , wherein a plurality of mixers of said multi-conversion tuner circuit are disposed in a same integrated circuit.
12. The system of claim 11 , further comprising an optical transition circuit operable provide conversion of signals carried by said fiber-optic cable transmission link to RF signals, wherein at least a part of said optical transition circuit is disposed in said same integrated circuit.
13. The system of claim 1 , further comprising:
a head-end controller operable to provide channel paring of said signals such that a plurality of signals utilized by subscriber equipment associated with said extended frequency optical transition node are all modulated within a frequency band no broader than a passband of said tuner circuit.
14. The system of claim 13 , wherein said tuner circuit comprises a tuner controller operable to control said tuner circuit to place said frequency band in said passband of said tuner circuit.
15. A system comprising:
an extended frequency optical transition node having an optical interface adapted to couple to a fiber-optic cable transmission network link and a radio frequency (RF) interface adapted to couple to a subscriber site RF link, said extended frequency optical transition node having a tuner circuit operable to provide frequency translation of signals carried by said fiber-optic cable transmission network link to selected frequencies output on said subscriber site RF link; and
a head-end controller operable to provide channel paring of said signals such that a plurality of signals utilized by subscriber equipment associated with said extended frequency optical transition node are all modulated within a frequency band no broader than a passband of said tuner circuit.
16. The system of claim 15 , wherein said tuner circuit operates in accordance with a signal provided by said head-end controller to adjust a tuning frequency of said tuner circuit.
17. The system of claim 16 , wherein said tuner circuit comprises a tuner controller operable to control said tuner circuit to place said frequency band in said passband of said tuner circuit in accordance with said head-end controller signal.
18. The system of claim 15 , wherein said passband of said tuner circuit is at least 100 MHz.
19. The system of claim 15 , wherein said passband of said tuner circuit passes at least 4 RF channels.
20. The system of claim 15 , wherein said optical interface accepts a signal having greater than 1 GHz bandwidth.
21. The system of claim 20 , wherein said signal has at least a 2 GHz bandwidth.
22. The system of claim 20 , wherein said RF interface outputs a signal having less than 1 GHz bandwidth.
23. The system of claim 15 , wherein said optical interface is adapted to accept a signal having a bandwidth greater than a tuning bandwidth of said subscriber equipment and said RF interface is adapted to output a signal having a bandwidth the same or less than the tuning bandwidth of said subscriber equipment.
24. The system of claim 15 , wherein said tuner circuit comprises a multi-conversion tuner circuit.
25. The system of claim 24 , wherein said multi-conversion tuner circuit comprises a double conversion tuner circuit.
26. A method comprising:
receiving information regarding a plurality of signals selected by subscriber equipment disposed at a subscriber site; and
controlling modulation of signals at a cable head-end to provide channel groupings such that said plurality of signals selected by subscriber equipment are modulated in RF channels falling within a selected bandwidth, said selected bandwidth being only a portion of available network transmission bandwidth.
27. The method of claim 26 , wherein said selected bandwidth comprises a bandwidth corresponding to a passband of an extended frequency optical transition node receiving said RF channels.
28. The method of claim 26 , wherein said available network transmission bandwidth is approximately 1 GHz and said selected bandwidth is approximately 100 MHz.
29. The method of claim 26 , wherein said available network transmission bandwidth is greater than 1 GHz and said selected bandwidth is approximately 100 MHz.
30. The method of claim 26 , further comprising:
converting said RF channels to an optical signal;
transmitting said optical signal to said subscriber site via a fiber-optic network link;
converting said optical signal to said RF channels at said subscriber site;
translating frequencies of said RF channels to a selected band of RF channels within a tuning range of said subscriber equipment, said selected band of RF channels being different than a band said RF channels were modulated in; and
outputting said selected band of RF channels on a subscriber site RF link coupled to said subscriber equipment.
31. The method of claim 30 , wherein said band said RF channels were modulated in is outside said tuning range of said subscriber equipment.
32. The method of claim 30 , further comprising:
multiplexing additional subscriber signals on said RF link coupled to said subscriber equipment.
33. The method of claim 32 , wherein said additional subscriber signals comprise local area network signals passed between systems disposed at said subscriber site.
34. A method comprising:
converting an optical signal received at a subscriber site to a plurality of RF channels;
translating frequencies of said RF channels to a selected band of RF channels within a tuning range of a subscriber equipment disposed at said subscriber site, said selected band of RF channels being different than a band said RF channels were modulated in; and
outputting said selected band of RF channels on a subscriber site RF link coupled to said subscriber equipment;
receiving information regarding a plurality of signals selected by said subscriber equipment disposed at said subscriber site;
controlling modulation of signals at a cable head-end to provide channel groupings such that said plurality of signals selected by subscriber equipment are modulated in said RF channels falling within a selected bandwidth, said selected bandwidth being only a portion of available network transmission bandwidth;
converting said RF channels to an optical signal; and
transmitting said optical signal to said subscriber site via a fiber-optic network link.
35. The method of claim 34 , wherein said band said RF channels were modulated in is outside said tuning range of said subscriber equipment.
36. The method of claim 34 , wherein said tuning range of said subscriber equipment is 1 GHz or less.
37. The method of claim 36 , wherein a transmission bandwidth of said optical signal received at said subscriber site is greater than 1 GHz.
38. The method of claim 34 , wherein said selected bandwidth comprises a bandwidth corresponding to a passband of an extended frequency optical transition node receiving said RF channels.
39. The method of claim 34 , wherein said available network transmission bandwidth is approximately 1 GHz and said selected bandwidth is approximately 100 MHz.
40. The method of claim 34 , wherein said available network transmission bandwidth is greater than 1 GHz and said selected bandwidth is approximately 100 MHz.