Fiber optic mechanical/thermal tuner and isolator

• US 7,110,624 B2
• Filed: 03/23/2004
• Issued: 09/19/2006
• Est. Priority Date: 12/14/2001
• Status: Expired due to Fees

• Current Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Original Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Inventors: Tanner, Allen H., Marceau, David, Williams, Forrest L., Elkins, Dennis F.
• Primary Examiner(s): KIANNI, KAVEH C
• Application Number:
  US10/807,808
• Publication Number:
  US 20040179766A1
• Time in Patent Office: 910 Days
• Field of Search: 385/12, 385/13
• US Class Current: 385/12
• CPC Class Codes: G02B 6/02171 characterised by means for compensating environmentally induced changes
• CPC Class Codes: G02B 6/022 using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper G02B6/02204 takes precedence; optical modulation using photo-elastic effect G02F1/0131
• CPC Class Codes: G02F 1/0115 in optical fibres
• CPC Class Codes: G02F 1/0134 in optical waveguides
• CPC Class Codes: G02F 1/0147 based on thermo-optic effects G02F1/132 takes precedence
• CPC Class Codes: G02F 2201/307 Reflective grating, i.e. Bragg grating
• CPC Class Codes: H01S 5/0612 controlled by temperature
• CPC Class Codes: H01S 5/12 the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers comprising a photonic bandgap structure H01S5/11; surface-emitting lasers H01S5/18

Abstract

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.

Claims

1. A tuning and isolating support device comprising:

a) a fiber optic tensioning structure having a longitudinal bore configured to receive a tunable fiber optic component and 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 an applied voltage 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) an inner electrode located on an inner surface of the fiber optic tensioning structure;

c) an outer electrode located on an outer surface of the fiber optic tensioning structure where the inner and outer electrodes are configured to apply an electrical potential radially to the fiber optic 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, further comprising acoustic damping material disposed within the bore.

5. The tuning and isolating support device of claim 1, wherein the tensioning structure further comprises at least one radially disposed aperture connecting the bore to an outer surface of the tensioning structure.

6. The tuning and isolating support device of claim 1, wherein the outer electrode is split into two sections and the inner electrode is connected to one of the sections to provide an external electrical connection to the inner electrode.

7. The tuning and isolating support device of claim 1, further comprising an electrically conductive plug positioned within the end of the bore and providing electrical contact to the inner electrode of the tensioning structure.

8. The tuning and isolating support device of claim 1, further comprising an electrically conductive plug positioned within the end of the bore and providing electrical contact to the outer electrode of the tensioning structure.

9. The tuning and isolating support device of claim 1, further comprising an electrical lead longitudinally disposed within the bore and in electrical contact with the inner electrode.

10. The tuning and isolating support device of claim 9, further comprising a conductive adhesive disposed within the bore and providing electrical connection between the electrical lead and the inner electrode.

11. The tuning and isolating support device of claim 1, 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.

12. A tuning and isolating support device comprising:

a) a fiber optic tensioning structure having at least opposing ends configured to rigidly attach to and along a common longitudinal axis with a tunable fiber optic component and formed of an electrically-active, mechanically-responsive material such that changes in dimension along the longitudinal axis arising from an applied voltage to the tensioning structure yield corresponding dimensional changes in the fiber optic component to provide tunable adjustment of an optical frequency of the fiber optic component;

b) an acoustic damping material encasing at least a portion of the tensioning structure and configured to minimize environmental vibration effects on the fiber optic component;

c) a tunable fiber optic component longitudinally mounted and rigidly attached to the tensioning structure wherein the tunable fiber optic component comprises a conductive jacket used to provide electrical connection to the tensioning structure.

13. The tuning and isolating support device of claim 12, wherein the tunable fiber optic component is rigidly attached to the tensioning structure with glue.

14. The tuning and isolating support device of claim 12, wherein the tunable fiber optic component is rigidly attached to the tensioning structure with clamps.

15. The tuning and isolating support device of claim 12, wherein the tunable 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.

16. The tuning and isolating support device of claim 15, wherein the distributed feedback fiber laser length is optimally selected to provide a particular mechanical natural frequency and optical linewidth.