Bi-directional optical link between multiple data sources and a processing node in an avionics platform

• US 20100124421A1
• Filed: 11/14/2008
• Published: 05/20/2010
• Est. Priority Date: 11/14/2008
• Status: Active Grant

• Current Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Information and Electronic Systems Integration Incorporated (BAE Systems Plc)
• Inventors: McNeill, Kevin M., Chand, Naresh
• Granted Patent: US 8,032,032 B2
• Time in Patent Office: Days
• US Class Current: 398/140
• CPC Class Codes: H04B 10/2587 using a single light source for multiple stations
• CPC Class Codes: H04B 10/2589 Bidirectional transmission
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04J 14/0226 Fixed carrier allocation, e.g. according to service
• CPC Class Codes: H04J 14/0246 using one wavelength per ONU
• CPC Class Codes: H04J 14/0247 Sharing one wavelength for at least a group of ONUs
• CPC Class Codes: H04J 14/025 using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
• 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 14/0267 Optical signaling or routing
• CPC Class Codes: H04J 14/0268 Restoration of optical paths, e.g. p-cycles
• CPC Class Codes: H04J 14/0276 using pilot tones
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 14/0295 Shared protection at the optical channel (1:1, n:m)
• CPC Class Codes: H04J 14/0297 Optical equipment protection
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]
• CPC Class Codes: H04J 2014/0253 Allocation of downstream wavelengths for upstream transmission
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 2011/009 Topology aspects

Abstract

A fiber optic link for platforms with data sources including, e.g., sensors, cameras, radars and antennas. An array of optical transmitter/receiver pairs is coupled to an integrating network of the platform. Data modules are each coupled to certain ones of the data sources and include a receiver for detecting control data, and a modulator for modulating a light signal according to signals from the module'"'"'s data sources. At least one optical fiber is coupled between a given transmitter/receiver pair of the array, and a corresponding data module. A laser source associated with each transmitter supplies a light signal with the control data to a corresponding data module downstream over an optical fiber. The light signal is modulated by the signals from the module'"'"'s data sources, and the modulated light signal is returned to an array receiver upstream over an optical fiber.

Claims

1. A fiber optic link suitable for avionics or naval platforms having a number of platform data sources, comprising:

a processing node associated with an integrating network or bus of platform;

an array of one or more optical transmitter/receiver (TXn/RXn) pairs located in the vicinity of the processing node;

an interface for coupling said array with the integrating network;

a number of data modules each of which is coupled to one or more associated platform data sources and includes (a) an optical receiver operative to detect control data input to the module, and (b) an optical modulator arranged to modulate a light signal according to signals received from the associated data sources, and

at least one optical fiber coupled between a given transmitter/receiver pair of said array, and a corresponding data module;

wherein a given transmitter of the array has an associated laser source operative to supply a light signal including said control data to an input of a corresponding data module downstream over an optical fiber, the modulator of the corresponding data module modulates the light signal according to the signals received from the associated data sources, and the modulated light signal is returned to an array receiver upstream over an optical fiber.

2. A fiber optic link according to claim 1, wherein the optical transmitter/receiver pairs of the array are co-located in a temperature controlled environment to reduce operating failure rates.

3. A fiber optic link according to claim 1, wherein the optical transmitter/receiver pairs of the array are constructed and arranged to operate at wavelengths in one or more bands selected from among 850 nm, 980 nm, 1300 nm and 1500 nm.

4. A fiber optic link according to claim 1, wherein transmitters of the array include light sources comprised of vertical cavity surface emitting lasers (VCSEL) or edge emitting lasers.

5. A fiber optic link according to claim 4, wherein the VCSEL or edge emitting laser sources are operative in a 980 nm wavelength band.

6. A fiber optic link according to claim 1, including an N×

N optical switch coupled in either the downstream or the upstream optical fibers so that a given transmitter or receiver of the array can be linked with a selected one of the data modules, wherein N is a number of transmitters or receivers used.

7. A fiber optic link according to claim 1, wherein transmitters of the array are operative to supply the light signal including the control data to the data modules, and modulators at the data modules are operative to return the modulated light signal to the receivers of the array, in a time domain format.

8. A fiber optic link according to claim 1, wherein transmitters of the array are operative to modulate the control data onto the downstream light signal using pulse position modulation, and modulators at the data modules are operative to modulate the data provided by their data sources onto the upstream light signal using on-off keying.

9. A fiber optic link according to claim 1, wherein transmitters of the array are operative to supply the light signal including the control data to the data modules, and modulators at the data modules are operative to return the modulated light signal to the receivers of the array, in a frequency domain format.

10. A fiber optic link according to claim 9, wherein the control data is allocated to lie within a radio frequency (RF) passband with a lowest frequency f1, and the data provided by the data sources is allocated to lie in a RF baseband with a highest frequency f2, and a sufficient guardband exists between f1 and f2.

11. A fiber optic link according to claim 9, wherein the control data is allocated to lie within a first radio frequency (RF) passband, and RF data representing an antenna data source is allocated to lie within a second RF passband.

12. A fiber optic link according to claim 9, wherein the control data is allocated to lie in a RF baseband, and RF data representing an antenna data source is allocated to lie within a RF passband.

13. A fiber optic link according to claim 1, including an optical power splitter coupled to an output of the laser source at one of the transmitters of the array, wherein outputs of the splitter are arranged to serve as light sources for association with other transmitters of the array.

14. A fiber optic link according to claim 1, including a directly modulated optical transmitter and an optical switch arranged to bypass the modulator at one of the data modules in the event of a modulator failure.

15. A fiber optic link according to claim 1, wherein transmitters of the array are constructed and arranged to modulate the control data on a first downstream light signal at a certain wavelength, and to supply a second downstream light signal at a different wavelength to be modulated at the data modules.

16. A fiber optic link according to claim 1, wherein the optical receiver and the optical modulator of at least one of the data modules, are in the form of an electro-absorption modulator (EAM), and a diplexer coupled to a control terminal of the EAM.

17. A fiber optic link according to claim 1, wherein a single optical fiber is provided for carrying both downstream and upstream signals between at least one transmitter/receiver pair of said array, and a corresponding data module.

18. The link of claim 17, including a first circulator coupled between one end of the single fiber and the transmitter/receiver pair, and a second circulator coupled between the opposite end of the fiber and the data module.