| Patent application number | Description | Published |
|---|
| 20080285753 | System for passive scrambling and unscrambling of an optical signal - A system for passively scrambling and unscrambling a, pulse optical signal transmitted through a multi-mode optical fiber is provided. The system includes a scrambling unit connected between a signal receiving end of said transmission fiber and an optical signal source that includes an optical fiber which creates a differential delay between two groups of optical modes of the signal that is at least one bit period long such that said optical signal is passively scrambled, and an unscrambling unit connected to a signal transmitting end of said transmission fiber having an optical fiber that counteracts said differential delay between said two groups of optical modes of the signal such that said optical signal is passively unscrambled. The scrambling unit optical fiber has an alpha profile with a complementary perturbation that creates the differential delay between two groups of optical modes of the signal, and the unscrambling unit optical fiber has an alpha profile with reversal complementary perturbation that counteracts the differential delay between said two groups of optical modes of the signal. Alternatively, the scrambling and unscrambling units may have the combination of a mode splitter that splits the signal into two different groups of optical modes, and a pair of optical fibers that conduct the two groups of optical modes in parallel, the fibers being of different lengths to create or to counteract a differential delay in the two groups of modes. | 11-20-2008 |
| 20090168818 | Systems and methods for polarization modulation of an optical signal - According to one embodiment of the present invention, a method of operating a laser source is provided. The laser source comprises a laser configured to generate an optical signal, and a polarization split and delay unit that is coupled to the optical signal. The polarization split and delay unit is configured to split the optical signal into a first and second orthogonally polarized component, create an optical path difference ΔL between the first and second orthogonally polarized components and combine the first and second orthogonally polarized components into a combined signal. The method comprises modulating the optical signal by applying a wavelength modulation signal to the laser such that the modulated optical signal comprises at least a first wavelength λ | 07-02-2009 |
| 20090185583 | UV and Visible Laser Systems - A laser system comprising: a light source generating light, said light source comprising at least two laser sources of different wavelengths; and a frequency converter operatively coupled to said light source to accept the light provided by said light source and to convert it to higher optical frequency such that said frequency converter is producing light output at the final output wavelength situated in the 150-775 nm range. | 07-23-2009 |
| 20090190618 | System and Methods For Speckle Reduction - A method of operating a laser source comprising is provided. The method reduces speckle contrast in a projected image by creating a plurality of statistically independent speckle patterns. The method comprises generating a plurality of sub-beams that define an optical mode. The method further comprises controlling the phase of selected sub-beams to continuously sequence the laser source through a plurality of orthogonal optical modes. The plurality of orthogonal modes create a corresponding number of statistically independent speckle patterns, thus reducing speckle contrast in a image projected using the laser source by time averaging. | 07-30-2009 |
| 20090323735 | Pulse stretching optical fiber and related systems and methods - An optical fiber for performing pulse stretching, and fiber laser systems and methods using the pulse-stretching fiber are disclosed. The pulse-stretching (PS) fiber has low fourth-order dispersion (dispersion curvature) and a third order dispersion (dispersion slope) with a small negative, nearly zero or small positive value. Two different types of fiber laser systems that use the PS fiber in a manner that achieves optimum performance are described. The PS fiber enables an all-fiber (up to the final pulse compressor) ultra-short pulsed laser systems reaching pulse energies exceeding 100 μJ, average powers exceeding 100 W, and output pulse widths of less than 100 fs. | 12-31-2009 |
| 20100150184 | Alignment and Wavelength Selection In External Cavity Lasers - A method of operating a laser projection system is provided. The projection system comprises an external cavity laser, an optical intensity monitor, laser projection optics, and a controller. The external cavity laser comprises a laser diode, an intra-cavity wavelength conversion device, and a wavelength selective element. According to the method, the position of the wavelength selective element is adjusted relative to an optical axis Z of the external cavity laser to optimize output intensity. Specifically, the position of the wavelength selective element is adjusted by (i) tilting the wavelength selective element about its wavelength selective axis Y to reflect a wavelength of interest along an optimum path in an XZ plane of the external laser cavity and (ii) tipping the wavelength selective element about its wavelength insensitive axis X to reflect the wavelength of interest along an optimum path in a YZ plane of the external laser cavity. Additional embodiments are disclosed and claimed. | 06-17-2010 |
| 20100254412 | Phase Modulation In A Frequency-Converted Laser Source Comprising An External Optical Feedback Component - A method of controlling a frequency-converted laser source is provided where the laser source comprises a laser cavity, an external optical feedback component, a wavelength selective component, and a wavelength conversion device and the method comprises driving a phase section of the laser cavity with a phase control signal that comprises a modulation component having a modulation amplitude φ | 10-07-2010 |
| 20100254417 | Method Of Controlling A Frequency-Converted Laser Source Comprising An External Optical Feedback Component - A method of controlling a frequency-converted laser source is provided where the laser source comprises a laser cavity, an external optical feedback component, a wavelength selective component, and a wavelength conversion device and the method comprises driving a gain section of the laser cavity with a gain signal that comprises a data component and a modulation component. The modulation component of the gain signal comprises a gain modulation amplitude I | 10-07-2010 |
| 20100272135 | Self-Seeded Wavelength Conversion - A method of operating a frequency-converted laser source is provided. According to the method, the gain section of a laser diode is driven such that the pulse repetition frequency ν | 10-28-2010 |
