Photonic interconnect and photonic processing for communications and data handling satellites

• US 5,661,582 A
• Filed: 10/26/1995
• Issued: 08/26/1997
• Est. Priority Date: 10/26/1995
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: TRW Inc. (Northrop Grumman Corporation)
• Inventors: Pawlowski, Peter R., Isara, Scott K., Tittle, Lawrence R., Kintis, Mark, Brock, John C.
• Primary Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US08/548,535
• Time in Patent Office: 670 Days
• Field of Search: 359/172, 359/133, 359/127, 359/128-129, 359/124, 359/173, 359/179, 455/12.1, 455/13.1, 455/13.3
• US Class Current: 398/121
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays
• CPC Class Codes: H04Q 11/0001 using optical switching
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0015 using splitting combining
• CPC Class Codes: H04Q 2011/0024 using space switching
• CPC Class Codes: H04Q 2011/0026 using free space propagation (e.g. lenses, mirrors)

Abstract

A photonic interconnect and photonic processing apparatus (10) for use in a communication and data handling satellite (12) is disclosed. The photonic interconnect and photonic processing apparatus (10) includes a receiving device (14) for receiving a plurality of input RF signals. An optical conversion device (28) coupled to the receiving device (14) converts the plurality of input RF signals to a plurality of input optical signals. This plurality of input optical signals are coupled to a plurality of input optical fibers (30). A distribution device (32) optically coupled to the optical conversion device (28) distributes at least one output optical signal from the plurality of input optical signals coupled to the plurality of input optical fibers. The at least one output optical signal is coupled to at least one output optical fiber (30) such that the at least one output optical signal coupled to the at least one output optical fiber (30) is distributed within the communication and data handling satellite (12).

Claims

1. A photonic interconnect and photonic processing apparatus for use in onboard distribution and routing of optical signals in a communication and data handling satellite, said apparatus comprising:

receiving means for receiving a plurality of input RF signals;

optical conversion means coupled to said receiving means for converting said plurality of input RF signals to a plurality of input optical signals, said plurality of input optical signals being coupled to at least one input optical fiber; and

distribution means optically coupled to said optical conversion means for distribution and routing of the optical signals onboard the communications and data handling satellite, said distribution means distributing at least one output optical signal from said plurality of input optical signals coupled to said at least one input optical fiber, said at least one output optical signal being coupled to at least one output optical fiber, wherein said at least one output optical signal coupled to said at least one output optical fiber is distributed within said communication and data handling satellite.

2. The photonic interconnect and photonic processing apparatus as defined in claim 1 further comprising output means optically coupled to said distribution means for processing said at least one output optical signal coupled to said at least one output optical fiber.

3. The photonic interconnect and photonic processing apparatus as defined in claim 1 wherein said receiving means includes an RF antenna.

4. The photonic interconnect and photonic processing apparatus as defined in claim 1 wherein said receiving means further receives a plurality of direct input optical signals and said optical conversion means couples said direct input optical signals to a plurality of input optical fibers.

5. The photonic interconnect and photonic processing apparatus as defined in claim 4 wherein said distribution means includes an optical combiner responsive to said plurality of input optical signals coupled to said plurality of input optical fibers so as to sum said plurality of input optical signals to generate a summed output optical signal which is coupled to said at least one output optical fiber.

6. The photonic interconnect and photonic processing apparatus as defined in claim 5 wherein said distribution means further includes a passive splitter responsive to said summed output optical signal coupled to said at least one output optical fiber so as to power divide and distribute said summed output optical signal to a plurality of output optical fibers from said passive splitter.

7. The photonic interconnect and photonic processing apparatus as defined in claim 1 wherein said distribution means includes an optical power divider and switching unit responsive to at least a single input optical signal coupled to said at least one input optical fiber so as to route said at least single input optical signal to at least one of a plurality of output optical fibers.

8. The photonic interconnect and photonic processing apparatus as defined in claim 2 wherein said output means selects said at least one output optical signal from said at least one output optical fiber and amplifies said at least one output optical signal.

9. The photonic interconnect and photonic processing apparatus as defined in claim 2 wherein said output means selects said at least one output optical signal from said at least one output optical fiber and converts said at least one output optical signal to a RF signal.

10. A photonic interconnect and photonic processing apparatus for use in onboard distribution and routing of optical signals in a communication and data handling satellite which receives a plurality of input RF signals, said apparatus comprising:

a plurality of optical modulators being responsive to the plurality of input RF signals so as to convert the plurality of input RF signals to a plurality of input optical signals, said plurality of input optical signals being coupled to a plurality of input optical fibers; and

a distribution module operable to distribute and route the optical signals onboard the communication and data handling satellite, said distribution module including,

an optical combiner optically coupled to said plurality of optical modulators with said plurality of input optical fibers, said optical combiner being responsive to said plurality of input optical signals so as to sum said plurality of input optical signals to generate at least one summed output optical signal, said at least one summed output optical signal coupled to at least one output optical fiber; and

a passive splitter optically coupled to said optical combiner with said at least one output optical fiber, said passive splitter being responsive to said summed output optical signal so as to power divide said summed output optical signal into a plurality of summed output optical signals.

11. The photonic interconnect and photonic processing apparatus as defined in claim 10 wherein said plurality of optical modulators are driven by a plurality of lasers, whereby said plurality of input optical signals each includes a unique optical wavelength carrier signal.

12. The photonic interconnect and photonic processing apparatus as defined in claim 10 wherein the satellite receives a plurality of direct input optical signals, whereby said optical combiner is optically coupled to said direct input optical signals so as to sum said direct input optical signals with said plurality of input optical signals to generate said at least one summed output optical signal.

13. The photonic interconnect and photonic processing apparatus as defined in claim 10 wherein said at least one summed output optical signal includes a sum of all of said plurality of input optical signals.

14. The photonic interconnect and photonic processing apparatus as defined in claim 10 wherein said at least one summed output optical signal includes a sum of a sub-set of said plurality of input optical signals.

15. The photonic interconnect and photonic processing apparatus as defined in claim 10 further comprising an output module, wherein one of said plurality of summed output optical signals is optically filtered and optically amplified and one of said plurality of summed output optical signals is optically filtered and converted from an optical signal to an RF signal.

16. A photonic interconnect and photonic processing apparatus for use with onboard distributing and routing of optical signals in a communication and data handling satellite which receives a plurality of input RF signals, said apparatus comprising:

a plurality of optical modulators being responsive to the plurality of input RF signals so as to convert said plurality of input RF signals to a plurality of input optical signals, said plurality of input optical signals being coupled to a plurality of input optical fibers; and

a distribution module operable to distribute and route the optical signals onboard the communication and data handling satellite, said distribution module including,

an optical power divider and switching unit optically coupled to said plurality of optical modulators with said plurality of input optical fibers, said optical power divider and switching unit being responsive to said plurality of input optical signals so as to route any one of said plurality of input optical signals to any one of a plurality of optical outputs from said optical power divider and switching unit.

17. The photonic interconnect and photonic processing apparatus as defined in claim 16 wherein each of said optical modulators is driven by a laser each having a same wavelength carrier signal.

18. The photonic interconnect and photonic processing apparatus as defined in claim 16 wherein said optical power divider and switching unit includes a plurality of passive splinters and a plurality of optical switches.

19. The photonic interconnect and photonic processing apparatus as defined in claim 18 wherein each of said passive splinters includes a single optical input and a plurality of optical outputs, said single optical input coupled to a single input optical fiber carrying a single input optical signal, whereby said single input optical signal is power divided among said plurality of optical outputs.

20. The photonic interconnect and photonic processing apparatus as defined in claim 18 wherein each of said optical switches includes a plurality of optical inputs corresponding to the number of passive splinters and a single optical output, whereby said optical switch switches one of said optical inputs to said optical output.

21. The photonic interconnect and photonic processing apparatus as defined in claim 20 wherein each of said optical switches includes a plurality of input optical fibers coupled to said plurality of optical inputs, a single output optical fiber coupled to said single optical output, and a rotating prism which rotates about an axis longitudinal to said single output optical fiber for optically coupling one of said input optical fibers to said single output optical fiber.

22. The photonic interconnect and photonic processing apparatus as defined in claim 20 wherein each of said optical switches includes a plurality of optical input fibers coupled to said plurality of optical inputs, a single output fiber coupled to said single optical output, and a plurality of electro-absorptive modulators coupled to said plurality of input optical fibers, whereby said electro-absorptive modulators optically pass a single optical signal from a single input optical fiber.