Patent application number | Description | Published |
20080219620 | Achieving Gaussian Outputs from Large-Mode-Area-Higher-Order Mode Fibers - A mode conversion technique to convert higher-order-mode into a nearly fundamental Gaussian shape by using a beam expander is developed and is particularly useful in high-power lasers and amplifiers. By using a beam expander between a transmitted fiber and a conventional mode conversion system, the strict lateral tolerance requirement can be overcome with high conversion efficiency. | 09-11-2008 |
20080317419 | OPTICAL FIBERS AND OTICAL FIBER DEVICES WITH TOTAL DISPERSION GREATER THAN MATERIAL DISPERSION - Disclosed are optical fiber devices incorporating optical fibers with total dispersion greater than material dispersion, and with preferred dispersion values less than +50 ps/nm-km. The desired dispersion values are obtained when light resides substantially in a single higher order mode (HOM) of the fiber, typically the LP | 12-25-2008 |
20090034562 | Visible continuum generation utilizing a hybrid optical source - An all-fiber supercontinuum source is formed as a hybrid combination of a first section of continuum-generating fiber (such as, for example, highly-nonlinear fiber (HNLF)) spliced to a second section of continuum-extending fiber (such as, for example, photonic crystal fiber (PCF)). The second section of fiber is selected to exhibit an anomalous dispersion value in the region of the short wavelength edge of the continuum generated by the first section of fiber. A femtosecond pulse laser source may be used to supply input pulses to the section of HNLF, and the section of PCF is spliced to the termination of the section of HNLF. A section of single mode fiber (SMF) is preferably inserted between the output of the laser source and the HNLF to compress the femtosecond pulses prior to entering the HNLF. It has been found that the hybrid combination of these two types of fibers allows for extension of the continuum on the short wavelength side—into the visible portion of the spectrum—by virtue of the first section of fiber acting as a “pump” source for the second section of fiber. | 02-05-2009 |
20090034925 | Optical Fibers and Optical Fiber Devices with Total Dispersion Greater than Material Dispersion - Disclosed are optical fiber devices incorporating optical fibers with total dispersion greater than material dispersion, and with preferred dispersion values less than +50 ps/nm-km. The desired dispersion values are obtained when light resides substantially in a single higher order mode (HOM) of the fiber, typically the LP | 02-05-2009 |
20090080470 | Locally perturbed optical fibers for mode transformers - The specification describes optical devices and related methods wherein an input mode is converted by multiple LPG mode transformers to produce an output with multiple predetermined modes. | 03-26-2009 |
20090185171 | Measuring modal content of multi-moded fibers - The output modal content of optical fibers that contain more than one spatial mode may be analyzed and quantified by measuring interference between co-propagating modes in the optical fiber. By spatially resolving the interference, an image of the spatial beat pattern between two modes may be constructed, thereby providing information about the modes supported by the optical fiber. | 07-23-2009 |
20090202191 | Systems and Techniques for Generating Cylindrical Vector Beams - A technique is described for generating a cylindrically polarized beam, e.g., a radially or azimuthally polarized beam. An input optical fiber is provided that supports signal propagation in a fundamental LP | 08-13-2009 |
20090257711 | Systems and Techniques for Generating Bessel Beams - A technique is described for generating a Bessel beam. An input optical fiber is provided that supports propagation in the fundamental mode. The input fiber is connected to a fiber mode converting device that provides phase matching, at a predetermined excitation wavelength, between the fundamental mode and a selected azimuthally symmetric higher-order mode. As an input to the fiber mode converting device, a coherent light beam is fed through the input optical fiber to provide a fundamental mode input at the excitation wavelength. The fiber mode converting device resonantly excites the selected azimuthally symmetric mode. The azimuthally symmetric mode is provided as a beam output from an endface of the fiber mode converting device to approximate a Bessel beam. | 10-15-2009 |
20100014820 | Optical fibers and optical fiber devices with total dispersion greater than material dispersion - Disclosed are optical fiber devices incorporating optical fibers with total dispersion greater than material dispersion, and with preferred dispersion values less than +50 ps/nm-km. The desired dispersion values are obtained when light resides substantially in a single higher order mode (HOM) of the fiber, typically the LP | 01-21-2010 |
20120093461 | Production of Optical Pulses At A Desired Wavelength Utilizing Higher-Order-Mode (HOM) Fiber - An apparatus and method for producing optical pulses of a desired wavelength utilizes a section of higher-order-mode (HOM) fiber to receive input optical pulses at a first wavelength, and thereafter produce output optical pulses at the desired wavelength through soliton self-frequency shifting (SSFS) or Cherenkov radiation. The HOM fiber is configured to exhibit a large positive dispersion and effective area at wavelengths less than 1300 nm. | 04-19-2012 |