Tension-controlled fiber optic 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 voltage applied to the tensioning structure yield corresponding dimensional changes in the tunable fiber optic component to provide tunable adjustment of an optical frequency of the tunable fiber optic component;
b) a first electrode electrically coupled to a first surface of the tensioning structure;
c) a second electrode electrically coupled to a second surface of the tensioning structure where the first and second electrodes are configured to apply the voltage to the tensioning structure; and
d) an acoustic-damping material encasing at least a portion of the tensioning structure and configured to minimize environmental vibration effects on the tunable fiber optic component.
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 a plug positioned within the end of the tensioning structure and having a hole configured to receive and rigidly attach to the tunable fiber optic component.
6. 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.
7. The tuning and isolating support device of claim 6 , wherein the tunable fiber optic component is rigidly attached to the tensioning structure with glue.
8. The tuning and isolating support device of claim 6 , wherein the tunable fiber optic component is rigidly attached to the tensioning structure with clamps.
9. The tuning and isolating support device of claim 6 , wherein the tunable fiber optic component is a distributed feedback fiber laser.
10. The tuning and isolating support device of claim 9 , wherein a length of the distributed feedback fiber laser is optimally chosen to provide a particular mechanical natural frequency and optical linewidth.
11. The tuning and isolating support device of claim 1 , further comprising
e) 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 the second applied voltage.
12. The tuning and isolating support device of claim 11 , further comprising the tunable fiber optic component longitudinally mounted and rigidly attached to the tensioning structure.
13. The tuning and isolating support device of claim 11 , wherein the thermally-controlled surface comprises a resistive heater wire embedded within the thermally-conductive, acoustic-damping material.
14. The tuning and isolating support device of claim 11 , wherein the thermally-controlled surface is selected from the group consisting of a thermoelectric cooler, a heat pump, and a heat exchanger.