Claims
- 1. A fiber device, comprising:a sleeve having an elongated tubular body with an input terminal and an output terminal; an optical filter attached to said input terminal and configured to transmit light in a pump spectral range and reflect light in a signal spectral range at wavelengths longer than any wavelength in said pump spectral range; a collimator lens disposed in said sleeve near said input terminal to receive light from said optical filter; a double-clad fiber ferrule placed in said sleeve at said output terminal; a double-clad fiber having a fiber core, an inner cladding layer surrounding said fiber core, and an outer cladding layer surrounding said inner cladding layer, said double-clad fiber further including a pump-receiving terminal coupled to said double-clad fiber ferrule to receive light from said collimator lens; and an input fiber bundled in said double-clad fiber ferrule along with said double-clad fiber and configured to carry signal light at a signal wavelength in said signal spectral range.
- 2. The device as in claim 1, wherein end facets of said double-clad fiber and said input fiber form an angle-polished surface facing said collimator lens.
- 3. The device as in claim 1, wherein said collimator lens is a GRIN lens.
- 4. The device as in claim 1, wherein a fiber core size of said double-clad fiber is substantially equal to a fiber core size of said input fiber.
- 5. The device as in claim 4, wherein both said double-clad fiber and said input fiber are single-mode fibers.
- 6. A fiber device, comprising:an outer tube having a pump input terminal and a double-clad output terminal; a first fiber collimator positioned within said outer tube at said double-clad output terminal and configured to have: (1) a first sleeve having an elongated tubular body with an input terminal and an output terminal, (2) an optical filter attached to said input terminal and configured to transmit light in a pump spectral range and reflect light in a signal spectral range at wavelengths longer than any wavelength in said pump spectral range, (3) a first collimator lens disposed in said first sleeve near said input terminal to receive light from said optical filter, (4) a double-clad fiber ferrule placed in said first sleeve at said output terminal, (5) a double-clad fiber having a fiber core, an inner cladding layer surrounding said fiber core, and an outer cladding layer surrounding said inner cladding layer, said double-clad fiber further including a pump-receiving terminal coupled to said double-clad fiber ferrule to receive light from said collimator lens, and (6) an input fiber bundled in said double-clad fiber ferrule along with said double-clad fiber and configured to carry signal light at a signal wavelength in said signal spectral range; and a second fiber collimator positioned within said outer tube at said pump input terminal and configured to have: (1) a second sleeve having an elongated tubular body with an input terminal and an output terminal, (2) a pump fiber ferrule placed in said second sleeve at said input terminal, (3) a plurality of pump fibers bundled together at one fiber terminals by said pump fiber ferrule to form a pump fiber bundle, wherein end facets of said bundled fiber terminals are polished to form an optical pump coupling surface for outputting pump light from said pump fibers in said pump spectral range, and (4) a pump collimator lens disposed in said second sleeve at said output terminal to receive and collimate said pump light and direct said pump light to said optical filter of said first fiber collimator.
- 7. The device as in claim 6, wherein at least one of said collimator lenses is a GRIN lens.
- 8. The device as in claim 6, wherein a fiber core size of said double-clad fiber is substantially equal to a fiber core size of said input fiber.
- 9. The device as in claim 6, wherein both said double-clad fiber and said input fiber are single-mode fibers.
Parent Case Info
This application claims the benefit of U.S. Provisional Application No. 60/206,131, filed on May 22, 2000.
US Referenced Citations (9)
Provisional Applications (1)
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Number |
Date |
Country |
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60/206131 |
May 2000 |
US |