| US 7,460,746 B2 | ||
| Tunable multi-loop opto-electronic oscillator with tunable RF or microwave filter based on optical filtering | ||
| Lutfollah Maleki, Pasadena, Calif. (US); Danny Eliyahu, Pasadena, Calif. (US); and Vladimir Ilchenko, Arcadia, Calif. (US) | ||
| Assigned to OEwaves, Inc., Pasadena, Calif. (US) | ||
| Filed on Jan. 13, 2006, as Appl. No. 11/332,027. | ||
| Claims priority of provisional application 60/644131, filed on Jan. 13, 2005. | ||
| Prior Publication US 2007/0009205 A1, Jan. 11, 2007 | ||
| Int. Cl. G02B 6/26 (2006.01) | ||
| U.S. Cl. 385—27 [385/1; 385/2; 385/39; 385/15; 359/245] | 20 Claims |
| 1. A device, comprising:
a light source to produce an optical beam at an optical carrier frequency;
an optical modulator to modulate the optical beam in response to a control signal to produce a modulated optical beam that
carries the control signal;
a plurality of signal loops to respectively receive loop signals derived from portions of the modulated optical beam;
a plurality of adjustable phase shifters coupled in the signal loops, respectively, to control respective phase shifts of
the loop signals;
a mechanism to combine the loop signals from the signal loops and to produce a feedback signal in the electrical domain; and
a tunable photonic electrical filter to filter the feedback signal to produce a filtered feedback signal as the control signal
received by the optical modulator, wherein the tunable photonic electrical filter comprises a second optical modulator which
converts the feedback signal into an optical signal, and wherein the tunable photonic electrical filter optically filters
the optical signal and tune a frequency of the filtered optical signal to tune a frequency of the control signal.
|