Optical tunable-based transmitter for multiple radio frequency bands

Patent metadata

Field	Value
Publication number	US-9490899-B1
Application number	US-201414268334-A
Country	US
Kind code	B1
Filing date	May 2, 2014
Priority date	May 17, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

An optical tunable transmitter is used to transmit multiple radio frequency bands on a single beam. More specifically, a tunable laser is configured to generate a plurality of optical wavelengths, and an optical tunable transmitter is configured to modulate each of the plurality of optical wavelengths with a corresponding radio frequency band. The optical tunable transmitter is also configured to encode each of the plurality of modulated optical wavelengths onto a single laser beam for transmission of a plurality of radio frequency bands using the single laser beam.

First claim

The invention claimed is:

1. An apparatus comprising:
a tunable laser configured to generate a plurality of optical wavelengths;
a demultiplexer configured to receive the plurality of optical wavelengths and simultaneously output N number of channels onto N number of optical wavelength paths, where N is an integer greater than 0;
an array of active bandpass optical filters controlled by a wavelength controller and is configured to receive the output of each of the N number of optical wavelength paths;
wherein the wavelength controller is connected to each bandpass optical filter to select a desired output optical wavelength;
wherein the output of each bandpass optical filter is controlled by the wavelength controller to generate the desired optical wavelength;
wherein the N number of optical wavelengths controlled by the wavelength controller is received by N number of electro-optic modulators and modulated by N number of radio frequency bands; and
wherein the N number of modulated optical wavelengths are transmitted to a multiplexer to combine into a single optical beam.

2. The apparatus of claim 1 , wherein each of the N number of optical wavelengths are mapped to one of the N number of radio frequency bands.

3. The apparatus of claim 1 , wherein the wavelength controller is configured to generate the plurality of optical wavelengths that are to be encoded on the single laser beam for transmission.

4. The apparatus of claim 3 , wherein the wavelength controller is further configured to control each filter to select one optical wavelength from the plurality of optical wavelengths intended for transmission on the single laser beam.

5. The apparatus of claim 1 , wherein the demultiplexer is configured to channel simultaneously the plurality of optical wavelengths onto each optical wavelength path.

6. The apparatus of claim 1 , wherein each active bandpass optical filters is configured to transmit one optical wavelength from the N number of optical wavelengths based on an operation command of the wavelength controller.

7. The apparatus of claim 1 , wherein each of the N number of electro-optic modulators are connected to one of the N number of radio frequency band paths and one of the N number of optical wavelength paths.

8. The apparatus of claim 7 , wherein each of the N number of electro-optic modulators are configured to modulate an optical wavelength with a corresponding radio frequency band.

9. The apparatus of claim 1 , wherein the a multiplexer is configured to encode each of the N number of modulated optical wavelengths onto the single laser beam.

Assignees

• Nasa
• The Us Administrator Of Nat Aeronautics And Space Administration

Inventors

• Nguyen Hung
• Simons Rainee N
• Wintucky Edwin G
• Freeman Jon C

Classifications

• H04B10/572

  Wavelength control · CPC title

• H04J14/02

  Wavelength-division multiplex systems · CPC title

• H04B10/503 Primary

  Laser transmitters · CPC title

• H04J14/0305

  in end terminals · CPC title

• H04B10/118 Primary

  specially adapted for satellite communication · CPC title