Fiber optic mechanical/thermal tuning and isolating device
A tunable fiber optic component providing environmental isolation, thermal tuning, and mechanical tuning and a method of tuning a fiber optic component using application of substantially simultaneous varying of temperature and mechanical strain is disclosed. A method of using a tunable fiber optic component, for example, a distributed feedback fiber laser, to compensate variations in an optical system, and a method of making a tunable fiber optic component are also disclosed.
1. A tuning and isolating support device for a tunable fiber optic component, comprising:
a) a fiber optic tensioning structure having at least opposing ends configured to rigidly attach to and along a common longitudinal axis with the tunable fiber optic component and formed of an electrically-active, mechanically-responsive material such that changes in dimension along the longitudinal axis arising from a first voltage applied to the tensioning structure yield corresponding dimensional changes in the fiber optic component to provide tunable adjustment of an optical frequency of the tunable fiber optic component; and
b) a thermal control structure coupled to the tensioning structure to control temperature of the fiber optic component and provide changes in the optical frequency by adjustment of the temperature, said thermal control structure including:
(i) a thermally-conductive, acoustic-damping material configured to minimize environmental vibration effects on the fiber optic component; and
(ii) a thermally-controlled surface in thermal contact with the thermally-conductive acoustic-damping material, wherein the thermally-controlled surface varies in temperature and controls the temperature of the fiber optic component so that the fiber optic component optical frequency is tuned at least partially in response to a second applied voltage applied to the thermally-controlled surface.
2. The tuning and isolating support device of claim 1 , wherein the tensioning structure is fabricated from a piezoelectric material.
3. The tuning and isolating support device of claim 1 , wherein the tensioning structure comprises at least one section of a piezoelectric material and at least one section of a rigid material.
4. The tuning and isolating support device of claim 1 , wherein the tensioning structure further comprises a longitudinal bore configured to receive the tunable fiber optic component.
5. The tuning and isolating support device of claim 4 , further comprising acoustic-damping material disposed within the bore.
6. The tuning and isolating support device of claim 4 , wherein the tensioning structure further comprises at least one radially disposed aperture connecting the bore to an outer surface of the tensioning structure.
7. The tuning and isolating support device of claim 4 , further comprising:
c) a first electrode located on a first surface of the fiber optic tensioning structure; and
d) a second electrode located on a second surface of the fiber optic tensioning structure where the first and second electrodes are configured to apply the first voltage to the fiber optic tensioning structure.
8. The tuning and isolating support device of claim 7 , wherein the first electrode is located on an inner surface of the fiber optic tensioning structure and the second electrode is located on an outer surface of the fiber optic tensioning structure so that the first voltage is applied radially to the tensioning structure.
9. The tuning and isolating support device of claim 4 , further comprising a plug positioned within the end of the tensioning structure and having a hole configured to receive and rigidly attach to the fiber optic component.
10. The tuning and isolating support device of claim 1 , further comprising the tunable fiber optic component longitudinally mounted and rigidly attached to the tensioning structure.
11. The tuning and isolating support device of claim 10 , wherein the tunable fiber optic component comprises a conductive jacket used to provide an electrical connection to the tensioning structure.
12. The tuning and isolating support device of claim 10 , wherein the fiber optic component is rigidly attached to the tensioning structure with glue.
13. The tuning and isolating support device of claim 10 , wherein the fiber optic component is rigidly attached to the tensioning structure with clamps.
14. The tuning and isolating support device of claim 10 , wherein the fiber optic component is configured as a distributed feedback fiber laser mounted with an active region of the distributed feedback fiber laser positioned substantially between the ends of the tensioning structure.
15. The tuning and isolating support device of claim 14 wherein a length of the distributed feedback fiber laser is optimally selected to provide a particular mechanical natural frequency and optical linewidth.
16. The tuning and isolating support device of claim 1 , wherein the thermally-controlled surface comprises a resistive heater wire embedded within the thermally-conductive, acoustic-damping material.
17. The tuning and isolating support device of claim 1 , wherein the thermally-controlled surface is selected from the group consisting of a thermoelectric cooler, a heat pump, and a heat exchanger.
18. The tuning and isolating support device of claim 1 wherein the tensioning structure has an operable bandwidth relative to the first voltage of about 0 to 500 kHz.
19. The tuning and isolating support device of claim 1 wherein the thermal control structure has an operable bandwidth relative to the second voltage of about 0 to 5 Hz.