Photonic oscillator

• US 7,324,256 B1
• Filed: 12/27/2004
• Issued: 01/29/2008
• Est. Priority Date: 12/27/2004
• Status: Expired due to Fees

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Sayyah, Keyvan
• Primary Examiner(s): Stultz; Jessica T
• Application Number:
  US11/023,918
• Time in Patent Office: 1,128 Days
• Field of Search: 359/245
• US Class Current: 359/245
• CPC Class Codes: G02F 1/0121 Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
• CPC Class Codes: G02F 1/0157 using electro-absorption effects, e.g. Franz-Keldysh [FK] effect or quantum confined stark effect [QCSE]
• CPC Class Codes: G02F 2/00 Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light G02F1/35 takes precedence
• CPC Class Codes: H04B 10/2575 Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier

Abstract

A photonic oscillator includes an optical transceiver that serves the dual purpose of detecting a feedback RF lightwave signal carried on a laser beam and electrically filtering the RF lightwave signal to modulate the RF lightwave signal in accordance therewith, to thereby set up steady state oscillations in the modulated RF lightwave signal and thereby generate a multi-tone oscillating lightwave.

Claims

1. A photonic oscillator, comprising:

an optical combiner configured to combine a laser beam with a second RF lightwave signal to generate a first RF lightwave signal;

an optical transceiver configured to detect the first RF lightwave signal, electrically filter the detected first RF lightwave signal, and modulate the detected first RF lightwave signal in accordance with the filtered first RF lightwave signal;

an optical delay path configured to delay the modulated first RF lightwave signal; and

an optical splitter configured to split the delayed modulated first RF lightwave signal into the second RF lightwave signal and a third RF lightwave signal.

2. The photonic oscillator of claim 1, further comprising:

a laser light source to emit the laser beam.

3. The photonic oscillator of claim 1, wherein the optical transceiver is an electroabsorption optical transceiver.

4. The photonic oscillator of claim 1, further comprising:

an optical amplifier in the optical delay path to amplify the delayed modulated first RF lightwave signal.

5. The photonic oscillator of claim 1, further comprising:

an electrical circuit connected to the optical transceiver to electrically filter the detected first RF lightwave signal.

6. The photonic oscillator of claim 5, wherein the electrical circuit comprises:

an electrical load.

7. A method for generating an optical oscillating signal, comprising:

generating a laser beam;

combining the laser beam with a second RF lightwave signal to generate a first RF lightwave signal;

detecting the first RF lightwave signal in an optical transceiver;

electrically filtering the detected first RF lightwave signal in the optical transceiver;

modulating the detected first RF lightwave signal in accordance with the filtered first RF lightwave signal in the optical transceiver;

delaying the modulated first RF lightwave signal; and

splitting the delayed modulated first RF lightwave signal into the second RF lightwave signal and a third RF lightwave signal.

8. The method of claim 7, wherein the optical transceiver is an electroabsorption optical transceiver.

9. The method of claim 7, further comprising:

amplifying the delayed modulated first RF lightwave signal prior to splitting it into the second RF lightwave signal and the third RF lightwave signal.

10. The method of claim 7, wherein electrically filtering the detected first RF lightwave signal comprises:

band-pass filtering the detected first RF lightwave signal.