High bandwidth communication system and method

• US 7,991,289 B2
• Filed: 03/28/2008
• Issued: 08/02/2011
• Est. Priority Date: 03/28/2008
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Bergfield, Justin P., Young, Abram G., Hill, Randy W.
• Primary Examiner(s): Bello; Agustin
• Application Number:
  US12/058,365
• Publication Number:
  US 20090245811A1
• Time in Patent Office: 1,222 Days
• Field of Search: None
• US Class Current: 398/82
• CPC Class Codes: H04B 10/501 Structural aspects
• CPC Class Codes: H04B 10/671 for controlling the input optical signal

Abstract

A communication system (20) includes a transmitter (22) with (i) a transmitter photonic crystal (30) having a waveguide (40) and multiple cavities (42, 44, and 46) spaced along the waveguide (40); (ii) a light source (32); and (iii) a controller (34) that controls the cavities (42, 44, and 46) to translate multiple electronic data bits to optical data bits simultaneously in respective cavities (42, 44, and 46) illuminated by the light source (32). A corresponding receiver (24) includes a receiver photonic crystal (92) having a data/key waveguide (104) for receiving a data/key signal and a latch waveguide (106) for receiving a latch signal. The photonic crystal (92) also includes data readout cavities (110, 112, 114, and 116) and lock cavities (160, 162, and 164) adapted to compare the key bits to respective lock bits. The data readout cavities (110, 112, 114, and 116) are spaced to read out the data bits simultaneously if (a) the data/key signal and the latch signal are received simultaneously, (b) the data/key signal and the latch signal have the same length, and (c) the key bits in the key/data signal match the lock bits.

Claims

1. An optical signal transmitter, comprising (i) a photonic crystal having a waveguide and a plurality of defect sites spaced along the waveguide, where the waveguide includes a main channel and a plurality of branch channels, where the length of each branch channel is selected to sequentially space optical data bits as they travel along the branch and main channels of the waveguide and out of the photonic crystal as a substantially continuous optical signal;

(ii) a light source arranged to direct light to the photonic crystal; and

(iii) a controller that controls the defect sites in the photonic crystal to translate electronic data bits to optical data bits in respective defect sites illuminated by the light source.

2. A transmitter as set forth in claim 1, wherein the defect sites are cavities.

3. A transmitter as set forth in claim 1, wherein the length of each branch channel is progressively shorter further from an output end of the main channel.

4. A transmitter as set forth in claim 1, wherein the main channel and the branch channels are defined by line defects.

5. A transmitter as set forth in claim 1, wherein the light source includes a laser.

6. A transmitter as set forth in claim 1, wherein the light source includes a photonic laser integrated into a microprocessor chip with a photonic crystal that employs a channel defect sized to provide a frequency filter.

7. A transmitter as set forth in claim 1, wherein the light source includes a frequency filter.

8. A transmitter as set forth in claim 1, including multiple photonic crystals and the light source includes a frequency filter arranged to output different frequencies to different photonic crystals.

9. A transmitter as set forth in claim 1, wherein the controller includes an input device.

10. An optical signal receiver, comprising an optical-to-electronic signal decoder;

and a photonic crystal having a waveguide for receiving an optical signal having a plurality of optical data bits, the photonic crystal also having a plurality of resonant cavities spaced along the waveguide to read out the optical data bits simultaneously along separate paths to the decoder, which translates the optical data bits to electronic data bits.

11. A receiver as set forth in claim 10, wherein the resonant cavities are coupled to parallel paths for simultaneous read out of optical data bits for conversion into electronic data bits.

12. A receiver as set forth in claim 10, wherein the photonic crystal includes an output connected to a controller.

13. A receiver as set forth in claim 10, including a plurality of waveguides that separate frequencies and a plurality of photonic crystals each of which is connected to a particular frequency waveguide.

14. An optical data transmission method, comprising the steps of translating electronic data bits into optical data bits substantially simultaneously, spatially sequencing the optical data bits into an optical signal, and transmitting the optical signal.

15. A method as set forth in claim 14, wherein the translating step includes applying a control signal to a photonic crystal and shining a light onto the photonic crystal to simultaneously generate multiple optical data bits that correspond to multiple electronic data bits.

16. An optical data reception method, comprising the steps of receiving an optical signal having a sequence of spatially sequenced optical data bits;

and reading the spaced optical data bits out of the optical signal substantially simultaneously.

17. An optical data receiver comprising a photonic crystal having a data/key waveguide for receiving a data/key signal, the data/key signal including a plurality of spaced apart bits that include one or more data bits and one or more key bits;

a latch waveguide for receiving a latch signal;

one or more lock cavities adapted to compare the key bits to respective lock bits; and

one or more data readout cavities spaced to read out the data bits simultaneously if (a) the data/key signal and the latch signal are received simultaneously, (b) the data/key signal and the latch signal have the same length, and (c) the key data bits in the key/data signal match the lock data bits.

18. A data transmission method, comprising the step of transmitting a data/key signal and a latch signal simultaneously along parallel communication paths, the data/key signal having a length and including at least two spatially displaced data bits, and the latch signal having the same overall length as the data/key signal.

19. A data reception method, comprising the steps of (i) receiving a data/key signal and a latch signal along parallel communication paths, where the data/key signal includes one or more data bits and one or more key bits;

and (ii) reading out the data bits from the key/data signal when (a) the data/key signal and the latch signal are received simultaneously, (b) the data/key signal and the latch signal have the same length, and (c) the key data bits in the key/data signal match predetermined lock data bits.