Claims
- 1. A multi-fiber optical collimator, comprising:
a plurality of optical fibers for carrying optical signals; a first lens having first and second sides and a first focal length, wherein the first side of the first lens is positioned a distance of about the first focal length from first ends of the optical fibers; and a beam expander having first and second sides, wherein the first side of the beam expander is positioned to face the second side of the first lens and the second side of the beam expander provides collimated beams associated with the optical signals carried by the optical fibers.
- 2. The collimator of claim 1, wherein the beam expander includes:
a second lens having first and second sides and a second focal length, wherein the first side of the second lens is positioned to face the second side of the first lens; and a third lens having first and second sides and a third focal length, wherein the first side of the third lens is positioned a distance of about the sum of the second and third focal lengths from the second side of the second lens.
- 3. The collimator of claim 2, wherein the second focal length is about 1.88 mm and the third focal length is about 12.8 mm.
- 4. The collimator of claim 3, wherein a working distance of the collimator is about 100 mm, an exit pupil beam waist radius of the collimator is about 1.25 mm and an exit pupil beam separation is about 0.54 degrees.
- 5. The collimator of claim 2, wherein the first, second and third lenses are one of spherical singlet lenses, aspheric singlet lenses, multiple element lenses, spherical mirrors, aspherical mirrors, gradient index (GRIN) lenses, GRADIUM lenses and Mangan mirrors.
- 6. The collimator of claim 2, wherein the first side of the second lens is positioned a distance of about the first focal length from the second side of the first lens.
- 7. The collimator of claim 1, wherein the beam expander is a single integrated lens unit with a first side of the integrated lens unit having a first radius and a second side of the integrated lens unit having a second radius.
- 8. A dual-fiber optical collimator, comprising:
a first and second optical fiber, wherein the first optical fiber has an angled first facet and the second optical fiber has an angled second facet, and wherein the first and second optical fibers are each adapted to carry an optical signal; a first D-shaped ferrule including a first integral fiber bore for receiving and retaining the first optical fiber; a second D-shaped ferrule including a second integral fiber bore for receiving and retaining the second optical fiber; a first lens having first and second sides and a first focal length, wherein the first side of the first lens is positioned a distance of about the first focal length from first ends of the optical fibers; and a housing shaped for receiving and retaining the first and second D-shaped ferrules and the first lens.
- 9. The collimator of claim 8, wherein the angled second facet opposes the angled first facet.
- 10. The collimator of claim 8, wherein the first lens is one of a spherical singlet lenses, an aspheric singlet lenses, a multiple element lenses, a spherical mirrors, an aspherical mirrors, a graded index (GRIN) lenses, a GRADIUM lenses and Mangan mirrors.
- 11. A method for fabricating a dual-fiber optical collimator, comprising the steps of:
providing first and second optical fibers, wherein the first optical fiber has an angled first facet and the second optical fiber has an angled second facet; providing a first D-shaped ferrule including a first integral fiber bore for receiving and retaining the first optical fiber; providing a second D-shaped ferrule including a second integral fiber bore for receiving and retaining the second optical fiber; providing a first lens having first and second sides and a first focal length, wherein the first side of the first lens is positioned a distance of about the first focal length from first ends of the optical fibers; and providing a housing for receiving and retaining the first and second D-shaped ferrules and the first lens.
- 12. The collimator of claim 11, wherein the angled second facet opposes the angled first facet.
- 13. The collimator of claim 11, wherein the first, second and third lenses are one of spherical singlet lenses, aspheric singlet lenses, multiple element lenses, spherical mirrors, aspherical mirrors, graded index (GRIN) lenses, GRADIUM lenses and Mangan mirrors.
- 14. A dynamic spectrum equalizer (DSE), comprising:
a plurality of circulators each including at least one input optical fiber, output optical fiber and common optical fiber, wherein each of the input optical fibers is adapted to carry an optical signal; a telescopic collimator, including:
a plurality of collimator input optical fibers each coupled to one of the common optical fibers; a first lens having first and second sides and a first focal length, wherein the first side of the first lens is positioned a distance of about the first focal length from first ends of the collimator input optical fibers; and a beam expander having first and second sides, wherein the first side of the beam expander is positioned to face the second side of the first lens and the second side of the beam expander provides collimated beams associated with the optical signals carried by the input optical fibers; a polarization beam separator receiving the collimated beams and separating the collimated beams into pairs of polarized beamlets that are substantially orthogonal to each other; a polarization rotator for rotating the polarity of one of the pairs of polarized beamlets provided by the polarization beam separator; a dispersive element providing a plurality of sets of beamlets whose propagation directions are dependent upon the beamlets wavelength; a focusing lens for receiving and directing the plurality of sets of beamlets; and a reflective spatial light modulator (SLM) for reflecting at least a portion of the beamlets focused onto individual pixels of the SLM by the focusing lens.
- 15. The DSE of claim 14, wherein the beam expander includes:
a second lens having first and second sides and a second focal length, wherein the first side of the second lens is positioned to face the second side of the first lens; and a third lens having first and second sides and a third focal length, wherein the first side of the third lens is positioned a distance of about the sum of the second and third focal lengths from the second side of the second lens.
- 16. The DSE of claim 15, wherein the second focal length is about 1.88 mm and the third focal length is about 12.8 mm.
- 17. The DSE of claim 16, wherein a working distance of the collimator is about 100 mm, an exit pupil beam waist radius of the collimator is about 1.25 mm and an exit pupil beam separation is about 0.54 degrees.
- 18. The DSE of claim 15, wherein the first, second and third lenses are one of spherical singlet lenses, aspheric singlet lenses, multiple element lenses, spherical mirrors, aspherical mirrors, gradient index (GRIN) lenses, GRADIUM lenses and Mangan mirrors.
- 19. The DSE of claim 15, wherein the first side of the second lens is positioned a distance of about the first focal length from the second side of the first lens.
- 20. The DSE of claim 14, wherein the beam expander is a single integrated lens unit with a first side of the integrated lens unit having a first radius and a second side of the integrated lens unit having a second radius.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 60/374,942, filed Apr. 23, 2002, the entire disclosure of which is hereby incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60374942 |
Apr 2002 |
US |