| Patent application number | Description | Published |
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| 20090033871 | Opthalmic optical coherence tomography (OCT) test station using a 1um fiber ASE source - A phosphate glass 1-μm fiber ASE source provides high power and broadband emission that covers wavelengths on the short side of Yb-doped silica. A single-mode fiber formed from phosphate glass is doped with highly elevated concentrations of Yb dopants 0.5-30 wt. % and typically 2-10 wt. %, far higher than either silica or germano-silicate. The high concentration of Yb dopant absorbs the pump in a short length, typically 10-150 cm instead of tens of meters, to provide high saturated output power and a shifted emission spectrum. The excess power allows the fiber ASE source to be configured to provide the output powers, emission bandwidth and stability desired by many applications. Furthermore, the ASE can be configured to emit a nearly Gaussian spectral profile without sacrificing power or bandwidth. The backward emission spectrum of Yb-doped phosphate glass is centered near 1020 nm instead of 1060, which allows the ASE source to cover wavelength on the short side of Yb-doped silica, which may be important in certain applications such as ophthalmic OCT where water absorption has a transparency window. | 02-05-2009 |
| 20100103958 | OPTICAL FIBER WITH MULTI SECTION CORE - An optical fiber comprising a core region embedded within a cladding. The core region of the optical fiber further comprises multiple sections, each doped with rare earth ions. The sections of the core region may be doped with different rare-earth ions or with different doping concentrations. The sections of the core region may also be made from different types of glass hosts. The optical fiber may further include multiple core regions embedded within the cladding, each core region having multiple sections doped with rare earth ions. | 04-29-2010 |
| 20110019700 | MODE-LOCKED TWO MICRON FIBER LASERS - A mode-locked fiber laser comprising a multicomponent glass fiber doped with a trivalent rare-earth ion of thulium and/or holmium. | 01-27-2011 |
| 20110058577 | Thulium and/or holmium doped silicated glasses for two micron lasers - A laser glass fiber with a core of the fiber composition, comprising a silicate glass host, one or more glass network modifiers, one or more glass network intermediators, and Thulium ions, Holmium ions, or a combination of Thulium ions and Holmium ions. The fiber emits laser light from 1.7 micron to 2.2 micron. | 03-10-2011 |
| 20110129179 | HIGHLY RARE-EARTH DOPED FIBER - A multicomponent glass fiber having a doping concentration of 55%-85% (wt./wt.) of a rare-earth oxide is presented. The rare-earth oxide is selected from the group comprising: Pr | 06-02-2011 |
| 20110129180 | HIGHLY RARE-EARTH DOPED FIBER ARRAY - An all-fiber Faraday rotator array comprising a plurality of Faraday rotating fibers, each having a doping concentration of 55%-85% (wt./wt.) of a rare-earth oxide, and a magnetic tube surrounding the plurality of Faraday rotating fibers is presented. The rare-earth oxide is selected from the group comprising: Pr | 06-02-2011 |
| 20110222562 | Mode-Locked Two-Micron Fiber Lasers - A mode-locked fiber laser comprising a multicomponent glass fiber doped with a trivalent rare-earth ion of thulium and/or holmium and including a fiber-optic based passive saturable absorber that contains an adhesive material mixed with a saturable absorbing components and is disposed along the length of an optical fiber such as to assure that a mode propagating within the fiber spatially overlaps with the volume occupied by the saturable absorbing components. | 09-15-2011 |
| 20110261454 | All-Fiber Optical Isolator - An all-fiber Faraday rotator including a plurality of optical fibers doped, at unusually high concentrations of at least several tens of percent, with rare-earth oxides, an all-optical-fiber optical isolator employing a polarization-maintaining fiber-optic splitter, and a method of optically-isolating a laser source from unwanted feedback with such an optical isolator. In a case where the doping concentration exceeds 55 weight-%, the length of the Faraday rotator achieving a 45-degree rotation of the polarization vector of light guided by an optical fiber does not exceed approximately 10 cm. | 10-27-2011 |
| Patent application number | Description | Published |
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| 20100026349 | SQUARE TO PSEUDO-SINUSOIDAL CLOCK CONVERSION CIRCUIT AND METHOD - A square wave to pseudo-sinusoidal clock conversion circuit comprises first and second stages. The first stage includes a cross-coupled differential pairs input gain stage having positive and negative input sides. Responsive to a differential square wave clock input, the first stage provides a first pass balanced differential clock with pull-up and pull-down symmetry. The second stage comprises positive and negative output side push-pull with low pass filter circuits, wherein the positive and negative output side push-pull with low pass filter circuits are responsive to the first pass balanced differential clock from the first stage for producing an output pseudo-sinusoidal clock that comprises a nearly sinusoidal output with slew rate controlled and clock waveform pull-up and pull-down symmetry for each of a respective one of the positive and negative output sides. | 02-04-2010 |
| 20100026367 | DOUBLE-BALANCED SINUSOIDAL MIXING PHASE INTERPOLATOR CIRCUIT AND METHOD - A double-balanced sinusoidal mixing phase interpolator circuit comprises: a double-balanced gain stage having a first input for receiving a first phasor clock, a second input for receiving a second phasor clock, and a phase interpolator (PI) output, wherein the double-balance gain stage includes (i) a first gain stage having a positive input side and a negative input side for the first phasor clock and (ii) a second gain stage having a positive input side and a negative input side for the second phasor clock; and a sinusoidal digital-to-analog (DAC) stage coupled to the double-balanced gain stage and configured to implement sinusoidal weighting of positive and negative sides of differential DAC current for the first phasor clock and positive and negative sides of differential DAC current for the second phasor clock, wherein the sinusoidal weighting provides uniformly spaced phase steps in the phase interpolator (PI) output. | 02-04-2010 |
| 20110248787 | VARACTOR CIRCUIT AND VOLTAGE-CONTROLLED OSCILLATION - A varactor circuit and voltage-controlled oscillation are described. The varactor circuit includes a first varactor, a second varactor, a third varactor, and a fourth varactor. A first source-drain node of the first varactor and a second source-drain node of the second varactor are coupled to a first input node. A first gate node for the first varactor is coupled to a first output node. A second gate node for the second varactor is coupled to a second output node. A third gate node for the third varactor and a fourth gate node for the fourth varactor are coupled to a second input node. A third source-drain node of the third varactor is coupled to the first output node. A fourth source-drain node of the fourth varactor is coupled to the second output node. In other embodiments, varactor circuits block and re-center VCO output CML. | 10-13-2011 |
