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| Number | Title | Issue Date |
| 8189257 | Optimized cascaded raman fiber-based laser source for high efficiency mid-infrared spectral generation A laser structure is provided that includes a pulsed source producing a pulsed signal having a low spontaneous noise component to its spectral output and a pulse-shape that is optimally flat. Also, the laser structure includes one or more optical fiber structures re... | 05/29/2012 |
| 8049956 | Apparatus for spectrum-doubled optical parametric chirped pulse amplification (OPCPA) using third-order dispersion chirping The present invention relates to an OPCPA apparatus. The OPCPA of the present invention includes an optical pulse stretcher (100) for outputting chirped laser light using odd-order dispersion (third-order dispersion is mainly used). A pump laser (200) ... | 11/01/2011 |
| 7813035 | Nonlinearity and dispersion management for pulse reshaping in high energy fiber amplifier A short pulse fiber laser amplification system includes a special fiber stretcher, managed preamplifier, managed amplifier chain, and managed compressor to control an increase of a passive dispersion by managing a third order dispersion (TOD) to a group velocity dis... | 10/12/2010 |
| 7688499 | Modular, high energy, widely-tunable ultrafast fiber source A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing eff... | 03/30/2010 |
| 7580184 | Gires-Tournois etalons and dispersion compensators A Gires-Tournois etalon (GTE) (10) comprising an optical fiber (12) in which a primary chirped fiber Bragg grating (FBG) (16) is provided, an RF signal generator (20), a piezoelectric transducer (22), and a glass horn (24), ... | 08/25/2009 |
| 7440173 | All fiber laser solution for spectral broadening and pulse stretching in a chirped pulse amplification fiber system A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of the laser wherein the stretcher further comprising a self-phase modulation (SPM... | 10/21/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7414780 | All-fiber chirped pulse amplification systems By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via ... | 08/19/2008 |
| 7411728 | Devices and methods for raman amplification and dispersion compensation The present invention provides devices and methods for Raman amplification and dispersion compensation. According to one embodiment of the present invention, a dispersion compensating device includes a dispersion compensating fiber having a dispersion more negative ... | 08/12/2008 |
| 7400441 | Optical amplifier, optical amplification repeater and pump light supply control method There is provided an optical amplifier including a Raman amplification medium, a rare earth doped fiber located at a latter stage of the Raman amplification medium, a first pump light outputting unit for outputting pump light with a plurality of wavelengths, a varia... | 07/15/2008 |
| 7379235 | Reducing polarization dependence of a wavelength dispersion variation monitor Reducing polarization dependence of a dispersion variation monitor includes receiving an optical signal. The optical signal is split into a first polarized signal having first photons and a second polarized signal having second photons. The first photons are receive... | 05/27/2008 |
| 7369780 | Remodulating channel selectors for WDM optical communication systems The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the informat... | 05/06/2008 |
| 7357521 | Chromatic dispersion compensation device and method A chromatic dispersion compensator whereby the amount of dispersion and the group delay time can be easily adjusted. A dispersion unit, a transmitting lens and a group delay generation unit are arranged along the optical axis of incident light. The dispersion unit s... | 04/15/2008 |
| 7352970 | Dispersion management system for soliton optical transmission system A dispersion management system for soliton or soliton-like transmission systems comprises a length of optical fiber (L) in which a plurality of sections (I) made up of components (N,A) of opposite sign dispersions are concatenated together. The duration of the dispe... | 04/01/2008 |
| 7342711 | Method and contrivance for applying a Raman amplification in a transmission and/or fibre device Raman amplification is used in optical transmission systems, devices and/or components way of for applying Raman amplification avoiding or suppressing detrimental and hence undesirable non-linear effects is provided. Raman amplification in an optical device is provi... | 03/11/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 7330611 | Method and apparatus for enhancing the extinction ratio in mode converters A method and apparatus for optimizing a non-ideal, real mode converter to substantially achieve the performance of an ideal mode converter. The method consists of optimizing the input linear polarization to the mode converter to balance the power in the principal mo... | 02/12/2008 |
| 7319819 | Suppression of four-wave mixing in ultra dense WDM optical communication systems through optical fibre dispersion map design The invention is the novel use of dispersion compensation in a long haul wavelength division multiplexed high capacity optical transport system which has very many channels packed extremely closely together, in order to greatly reduce the deleterious effects of four... | 01/15/2008 |
| 7280765 | Low total excursion dispersion maps A process optically transports digital data over an all-optical long-haul communication path. The process includes transporting digital optical data signals at a selected bit rate and a selected wavelength over a sequence of transmission spans. The sequence includes... | 10/09/2007 |
| 7274880 | Raman assisted EDFA system and method A system, amplifier and method are provided for amplifying an optical signal in an optical communications system where spans between amplifiers may vary. The system includes a Raman amplifier variable gain portion and an EDFA gain portion. The amount of Raman amplif... | 09/25/2007 |
| 7269349 | Method of and device for performing bi-directional transmission using a single-wire Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line. A Raman pump light source generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first s... | 09/11/2007 |
| 7260279 | Integrated opto-electronic oscillators Integrated opto-electronic oscillators that use micro resonators in the optical section of the opto-electronic feedback loop. ... | 08/21/2007 |
| 7254291 | Optical interferometer One embodiment of an optical interferometer includes a first MMI device coupled to a second MMI device via a waveguide. The first MMI device separates a first signal into a guided portion and a diffused portion. The guided portion is transmitted to the second MMI de... | 08/07/2007 |
| 7231111 | Tunable dispersion compensator A tunable dispersion compensator includes a collimating unit that collimates an incident light to output a parallel light, a parallel shifting unit that spatially shifts the parallel light from the collimating unit within a predetermined range, and an optical-path-l... | 06/12/2007 |
| 7231108 | Lumped raman amplifier for adaptive dispersion compensation An adaptive dispersion compensation system that also achieves optical amplification by inducing Raman amplification effects in dispersion compensating fiber. This amplification/chromatic dispersion compensation architecture may be applied, e.g., at the end of an all... | 06/12/2007 |
| 7224518 | Fiber-optic amplification of light pulses A device for amplifying light pulses has an optical stretcher, in which the light pulses of a pulsed laser light source are temporally stretched, and an optically pumped amplifier fiber, in which the light pulses are amplified and, at the same time, temporally compr... | 05/29/2007 |
| 7221877 | Optical transmission system for high-bit-rate transmission of optical signals with the aid of dispersion compensation units In the high-bit-rate transmission of optical signals in an optical transmission system having N optical fiber link sections with, in each case, one optical fiber and one dispersion compensation unit, the absolute-magnitude compensations of the first to Nth dispersio... | 05/22/2007 |
| 7221827 | Tunable dispersion compensator An optical dispersion compensator including: a spacer element having a top surface and a bottom surface; a thin film, multi-layer mirror formed on the top surface of the spacer element, the thin film mirror having a thermally tunable reflectivity; a highly reflectiv... | 05/22/2007 |
| 7218443 | Generation of tunable light pulses A device for generating tunable light pulses has a non-linear optical fiber. The optical spectrum of femtosecond light pulses can be modified by this optical fiber, taking advantage of solitonic effects. In order to make available such a device, which makes it possi... | 05/15/2007 |
| 7215464 | Optical amplifier Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal li... | 05/08/2007 |
| 7194208 | Wavelength-division multiplexing optical transmission system and optical communication method A wavelength-division multiplexing optical transmission system for providing a compensating-purpose dispersion D2 to a wavelength-division multiplexing optical signal to be transmitted through an optical transmission path from a transmitter terminal to a rece... | 03/20/2007 |
| 7190510 | Metro wavelength division multiplexing network A metro wavelength division multiplexing network is disclosed and includes a plurality of optical repeaters connected to each other through an optical fiber link, wherein each of the optical repeaters includes a Raman gain medium for Raman-amplifying inputted optica... | 03/13/2007 |
| 7190442 | Method of evaluating fiber PMD using POTDR trace A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer is disclosed. A pulse radiation is emitted into an end of the fiber under test, and the backscattered radiation is measured by the POTDR and used to obta... | 03/13/2007 |
| 7180582 | Apparatus and method for measuring characteristics of optical fibers An apparatus and method for accurate measurement of characteristics of optical fibers (distribution of polarization mode dispersion and distribution of magnitude of birefringence). Pulse light is inputted to a subject optical fiber, back scattered light of the pulse... | 02/20/2007 |
| 7173756 | Optical amplification system for variable span length WDM optical communication systems An optical communications system includes a plurality of optical fiber spans. An optical loss of one of the plurality of optical fiber spans is different from an optical loss of another one of the plurality of optical fiber spans. At least one of the plurality of op... | 02/06/2007 |
| 7171068 | Method to improve an extinction ratio of an optical device A method to improve an extinction ratio of an optical device, the method includes positioning at least a majority of a plurality of micro-mirrors in an off-state position. A mirror assembly includes the plurality of micro-mirrors. The method also includes selectivel... | 01/30/2007 |
| 7167300 | Modular, high energy, widely-tunable ultrafast fiber source A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing eff... | 01/23/2007 |
| 7142356 | Fast dynamic gain control in an optical fiber amplifier The present invention provides methods and apparatuses for controlling a gain of an optical fiber amplifier. Gain circuitry operates in an opened loop configuration and uses a predetermined function relating a power variation of at least one wavelength region with a... | 11/28/2006 |
| 7139489 | System and method of dispersion compensation in optical communication systems A method of compensating for chromatic dispersion in an optical signal transmitted on a long-haul terrestrial optical communication system including a plurality of spans, including: allowing chromatic dispersion to accumulate over at least one of the spans to a firs... | 11/21/2006 |
| 7139453 | Variable dispersion compensator utilizing wavelength conversion A dispersion compensator and method of dispersion compensation in which an input light is converted to a selected second wavelength, the converted light beam having the second wavelength is dispersion compensated in an amount dependent upon the second wavelength, an... | 11/21/2006 |
