Abstract:
PROBLEM TO BE SOLVED: To provide an optical fiber for use as a high power optical amplification medium, which is highly efficient and which exhibits minimum nonlinear effects.SOLUTION: An optical fiber includes: (i) a silica based, rare earth-doped core having a first index of refraction n, the core comprising more than 1 mass% of Yb, the core having less than 5 dB/km loss at a wavelength situated between 1,150 nm and 1,350 nm and less than 20 dB/km loss at the wavelength of 1,380 nm and slope efficiency of over 0.8; and (ii) at least one silica-based cladding surrounding the core and having a second index of refraction n, such that n>n.
Abstract:
An optically active fiber ( 30 ) is disclosed for making a fiber laser ( 18 ) or an amplifier ( 16 ) for optically pumping by a broad area laser diode for operation in the 1.5 micron band. This double-clad structured active fiber ( 30 ) has a core ( 34 ), doped with an optically excitable erbium ion having a quasi-three-level transition. The core ( 3 ) has a core refractive index and a core cross-sectional area. An inner cladding ( 32 ) surrounds the core ( 34 ). The inner cladding ( 32 ) has an inner cladding refractive index less than the core refractive index, an inner cladding cross-sectional area between 2 and 25 times greater than that of the core cross-sectional area, and an aspect ratio greater than 1.5:1. An outer cladding ( 36 ) surrounds the inner cladding ( 32 ) and has an outer cladding refractive index less than the inner cladding refractive index.
Abstract:
An optical amplifier comprises a trivalent thulium-doped optical fiber; a first pump light emitting device optically coupled to the fiber for generating a primary pump source at a first wavelength, and a second pump light emitting device optically coupled to the fiber for generating a secondary pump source at a second wavelength. In a preferred aspect of the present invention, the amplifier also includes a third (auxiliary) pump light emitting device optically coupled to the fiber for generating a third pump source at a third wavelength. Each of the amplification signals comprise at least one pre-selected wavelength. The first amplification signal has a wavelength pre-selected to provide a reduced noise figure for the amplifier. The second amplification signal has a wavelength pre-selected to increase the optical efficiency of the amplifier. The third amplification signal can have a wavelength pre-selected to populate the 3F4 energy level of the fiber, and to minimize depletion of the 3H6 ground state.
Abstract:
A method for generating a linear single-polarization output beam comprises providing an optically active linearly birefringent and linearly dichroic fiber for propagating light and having a single polarization wavelength range and a gain bandwidth; optically pumping the optically active linearly birefringent and linearly dichroic fiber for obtaining fluorescence within the gain bandwidth; and aligning the single-polarization wavelength range to overlap a desired spectral region of the gain profile.
Abstract:
An optical fiber (10), comprising: (i) a rare earth doped silica based elongated core (12) with a first refractive index (n1 with an aspect ratio of 1.5 to 10; (ii) a silica based moat (13) abutting and at least substantially surrounding the core, the moat having a refractive index n2, wherein n21; (iii) a silica based inner cladding (14) surrounding the moat, the inner cladding having a third refractive index (n3), wherein n1>n3; and n3>n2; (iv) a silica based outer cladding (16) surrounding said inner cladding, the outer cladding having a fourth refractive index (n4), such that n43; the optical fiber exhibits single polarization at the operating wavelength band.
Abstract:
An optical fiber including: (i) a silica based, Yb doped core having a first index of refraction nj, said core comprising more than lwt % of Yb, said core having less than 5 dB/km loss at a wavelength situated between 1150 run and 1350 nm and less than 20 dB/km loss at the wavelength of 1380 nm and slope efficiency of over 0.8; and (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n\> n2.
Abstract translation:一种光纤,包括:(i)具有第一折射率nj的二氧化硅基Yb掺杂芯,所述芯包括大于1wt%的Yb,所述芯在波长处具有小于5dB / km的损耗,位于1150nm 1350 nm,波长1380 nm时损耗小于20 dB / km,斜率效率超过0.8; 和(ii)至少一个围绕所述芯并且具有第二折射率n2的基于二氧化硅的包层,使得n 1> n 2。
Abstract:
An optical system comprises an optical fiber with gain producing core with an index of refraction n 1 , surrounded by at least one cladding with an index of refraction n 2 , said cladding including at least one index reduced area with an index of refraction n 2 , such that n 1 >n 2 >n 2 , the core propagating signal at a spatial fundamental mode at a signal wavelength ? 1 and at a power level sufficient to generate optical power at a wavelength ? 2 , where ? 2 > ? 1 , and the optical fiber has at least one cut-off fundamental spatial mode wavelength ? c , and ? 1 c and ? 2 >? c .
Abstract:
According to one example of the invention an optical fiber comprises: (i) silica based, rare earth doped core having a first index of refraction n1; (ii) at least one silica based cladding surrounding the core and having a second index of refraction n2, such that n1> n2 with the following features, alone or in combination: said cladding includes 0.5 to 5 wt% F and 0.5 to 20 wt% B, said optical fiber has less than 8dB/km core background loss at a wavelength of 1280 nm. at least one of the core or cladding is doped with AI203 concentration is less than 2:1.
Abstract:
An optically active linear single polarization device includes a linearly birefringent and linearly dichroic optical waveguide (30) for propagating light and having single polarization wavelength range (48). A plurality of active dopants are disposed in a portion (34) of the linearly birefringent and linearly dichroic optical waveguide (30) for providing operation of the waveguide in an operating wavelength range (650) for overlapping the single polarization wavelength range (48).
Abstract:
An optical fiber comprising a core having a refractive index profile and a centerline; and a cladding layer surrounding and directly adjacent the core; wherein core includes updoping material and is doped with Aluminum in at least one region of the core, such that either: (a) the average longitudinal acoustic wave velocity within the core is within 0.05% of the longitudinal acoustic wave velocity within the cladding; or (b) the longitudinal acoustic wave velocity in the core changes by at least 0.2%.