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| Number | Title | Issue Date |
| 8073336 | Entanglement-based QKD system with active phase tracking Entanglement-based QKD systems and methods with active phase tracking and stabilization are disclosed wherein pairs of coherent photons at a first wavelength are generated. Second harmonic generation and spontaneous parametric downconversion are used to generate fro... | 12/06/2011 |
| 8005368 | Signal equalizer in a coherent optical receiver A signal equalizer for compensating impairments of an optical signal received through a link of a high speed optical communications network. At least one set of compensation vectors are computed for compensating at least two distinct types of impairments. A frequenc... | 08/23/2011 |
| 7558485 | Processes and systems involving optical phase conjugators The desirable effects of an optical phase conjugator are accompanied by a frequency shift with reversal of the frequency order of channels in a multichannel optical communication system. Such effects are rectifiable by employing a sequence involving demultiplexing t... | 07/07/2009 |
| 7379677 | Method of wavelength conversion and wavelength converter The wavelength converter comprises (1) an optical multiplexer for multiplexing an amplitude-modulated first light and reference light, which is continuous light having a wavelength different from the wavelength of the first light, (2) an optical fiber for propagatin... | 05/27/2008 |
| 7366412 | Hybrid fine-coarse carrier switching An optical shell node is provided with an ability to perform time switching on signals received from subtending edge nodes and channel switching on signals received from other shell nodes and destined for the subtending edge nodes. The signals received from the subt... | 04/29/2008 |
| 7349609 | Terahertz radiation generation and methods therefor Terahertz radiation generation systems and methods are implemented using a variety of methods and devices. According to an example embodiment of the present invention, method for generating terahertz radiation is implemented where the wavelength of an optical pulse ... | 03/25/2008 |
| 7327512 | Optical waveform monitor apparatus and oscilloscope A measured optical pulse and a sampling optical pulse having different wavelengths are input to a nonlinear optical effect, that is, (i) a nonlinear optical medium generating four optical wave mixing or three optical wave mixing, and the optical intensity of the wav... | 02/05/2008 |
| 7324567 | Modulation frequency tunable optical oscillator Provided is a millimeter-wave band frequency optical oscillator that can be used as an oscillation frequency signal source for a millimeter-wave forwarded to wireless subscribers from a base station of a millimeter-wave wireless subscriber communication system for a... | 01/29/2008 |
| 7324759 | Method and apparatus for reducing phase jitter in an optical communication system Method and apparatus for transmitting a light signal in an optical transmission system is described. In an example, an optical transmission link includes an input port and an output port. The optical transmission link is configured to propagate optical pulses from t... | 01/29/2008 |
| 7310318 | Method and system for using optical phase conjugation in an optical communications network A optical communications network including at least one optical phase conjugator for compensating for non-linear effects. The optical communications network includes at least one dispersion compensation module before the optical phase conjugator and at least one dis... | 12/18/2007 |
| 7302189 | Optical component provided with demultiplexing function and wavelength dispersion compensator It is an object of the present invention to provide an optical component provided with a demultiplexing function capable of reducing an insertion loss and downsizing, and a wavelength dispersion compensator using such an optical component. In order to achieve the ob... | 11/27/2007 |
| 7248396 | Large bandwidth optical parametric amplifier WDM optical signals are amplified using optical parametric amplification by applying an appropriate separation of those optical signals according to their carrier angular frequencies. These angular frequencies are within the two principal amplification bands defined... | 07/24/2007 |
| 7212746 | Short haul optical communications Short haul optical communication networks using multi longitudinal mode lasers are susceptible to significant degradation from mode partition noise. Losses from such noise in short haul networks are substantially reducible by employing an additional fiber with speci... | 05/01/2007 |
| 7206516 | Apparatus and method for measuring the dispersion of a fiber span 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 and method for measuring dispersion in a fiber span is disclosed. In particul... | 04/17/2007 |
| 7203423 | Methods and systems for polarization mode dispersion compensation Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, ... | 04/10/2007 |
| 7187868 | Wavelength division multiplexing optical transmission system using a spectral inversion device A WDM system includes a transmission station, a receiving station, a first optical path and a second optical path. The first optical path includes a first section and a second section, the second section being capable of compensating at least partially the dispersio... | 03/06/2007 |
| 7184512 | Phase locked loop circuit and optical communications receiving apparatus A clock generator is configured to generate, on the basis of an oscillation frequency clock of a voltage-controlled oscillator, a first signal having a phase the same as the oscillation frequency clock, a second signal having a phase delayed by a first phase amount ... | 02/27/2007 |
| 7184665 | Tunable dispersion compensator A chromatic dispersion compensator in a single-pass and a double-pass version is disclosed. In a single-pass version, the compensator has a diffractive grating for spatially separating an input optical signal into spatially spaced frequency components and a MEMS arr... | 02/27/2007 |
| 7184410 | Method and system for using optical phase conjugation in an optical communications network including an add/drop multiplexer A method and system for using optical phase conjugation in an optical communications network including an add-drop multiplexer. The method includes determining a position for an optical phase conjugator such that channel quality for a channel in improved above a thr... | 02/27/2007 |
| 7177544 | Photonic network packet routing method and packet router for photonic network A photonic network packet routing method includes the steps of optically encoding destination address information attached to an IP packet using light attributes, discriminating the encoded address information of the IP packet by optical correlation processing, swit... | 02/13/2007 |
| 7151898 | Deterministic first and second order polarization mode dispersion compensator A polarization mode dispersion (PMD) feedforward compensator compensates first and second order PMD. An optical signal is provided to a PMD detector that senses first and second order PMD in the optical signal and produces control signals for the PMD compensator. Th... | 12/19/2006 |
| 7119325 | System and method for monitoring environmental effects using optical sensors An apparatus and method for determining a physical parameter affecting an optical sensor or a number of sensors in a network. The apparatus uses a narrow linewidth source at an emission wavelength λe and an arrangement for varying the emission wavelength... | 10/10/2006 |
| 7102813 | Continuous wave pumped parallel fiber optical parametric amplifier A number of nonlinear optical fibers are configured in a parallel configuration. The fibers are pumped with optical pumps having a wavelength slightly longer than the zero dispersion wavelength for each fiber. By a demultiplexer optical signals within a certain wave... | 09/05/2006 |
| 7088495 | Method and apparatus for time-division multiplexing to improve the performance of multi-channel non-linear optical systems The present invention generally provides systems and methods for distribution of radiation among a plurality of optical channels, each of which can include a non-linear optical element. An optical system of the invention can include a source for generating radiation... | 08/08/2006 |
| 7034994 | Dispersion management for long-haul high-speed optical networks The dispersion managed solution for long haul, high speed D/WDM systems according to the invention operates on three closely related aspects of the communication system. One is provision of a new type of dispersion managed (DM) optical cable with improved dispersion... | 04/25/2006 |
| 7031580 | Restoring optical pulses In one embodiment of the present invention, a method includes introducing an optical signal into a first arm and a second arm of an optical device; self-phase modulating the optical signal propagating in the first arm; and outputting a high intensity portion of the ... | 04/18/2006 |
| 7012740 | Optical parametric circuit An optical parametric circuit including an optical coupler including a first output port and a second output port, and a nonlinear loop mirror on which an optical path which connects the first output port and the second output port is formed, in which the nonlinear ... | 03/14/2006 |
| 6980744 | Methods and systems for polarization mode dispersion compensation Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, ... | 12/27/2005 |
| 6963675 | Device and system for phase conjugate conversion and wavelength conversion The device according to the present invention relates to phase conjugate conversion and wavelength conversion. This device includes a polarization beam splitter and a polarization maintaining fiber (PMF). The polarization beam splitter has first, second, and third p... | 11/08/2005 |
| 6947617 | Polarized wave scrambler and optical signal transmission apparatus A polarized wave scrambler and an optical signal transmission apparatus in which polarization mode dispersion is suppressed, and which has first and second polarization maintaining optical fibers, wherein respective constant components of a phase difference characte... | 09/20/2005 |
| 6915081 | PLL circuit and optical communication reception apparatus The invention provides a PLL circuit wherein, even if the duty ratio of an input signal varies, stabilized PLL operation is achieved. The PLL circuit includes a phase detection circuit and a frequency detection circuit. The frequency detection circuit includes a pai... | 07/05/2005 |
| 6823138 | Optical communications terminal station, optical signal transmission method, and optical signal increasing method in wavelength multiplexing system An OPC generates a pump light having the wavelength λs with a power larger than a threshold for generating a nonlinear effect in an optical fiber for a main signal having the wavelengths λ1 through λ4 transmitted from an OS, and wavelength-multiplex... | 11/23/2004 |
| 6823144 | Optical transmission system An optical transmission system is provided which uses optical single-sideband (SSB) modulation and incorporates at least one mid-span analog SSB regenerator arranged to produce a phase conjugation of the transmitted signal. The phase conjugation technique, referred ... | 11/23/2004 |
| 6792168 | Device for compensating polarization dispersion in an optical transmission system A device for compensating the polarization dispersion suffered by an optical signal when it is transmitted by an optical line includes a polarization controller. It generates a differential time delay between two orthogonal polarization modes and controls the polari... | 09/14/2004 |
| 6771853 | Optical fiber communication system using optical phase conjugation as well as apparatus applicable to the system and method of producing the same An optical fiber communication system according to the present invention has, for example, first and second phase conjugators. The first phase conjugator converts a signal beam from a first optical fiber into a first phase conjugate beam. The first phase conjugate b... | 08/03/2004 |
| 6763157 | Self aligning optical interconnect with multiple opto-electronic devices per fiber channel A system to facilitate alignment of an optical connector to respective optical channels of one or more optical arrays. Optical planar arrays having multiple optical emitters and multiple optical detectors of a multi-channel optical link are aligned by employing supp... | 07/13/2004 |
| 6760110 | Low coherent reflectometer A low coherent reflectometer uses low coherent beams for measurement of refletance and refleting positions with respect to a measured optical circuit which includes a reflecting point. The low coherent beams are branched to produce measurement beams (DL) and local b... | 07/06/2004 |
| 6748178 | Optical transmission line An optical fiber (12a) with a large effective core area and a large chromatic dispersion value is disposed on an input side of signal light, and an optical fiber (12b) with a small effective core area and a small chromatic dispersion valu... | 06/08/2004 |
| 6728019 | Optical gate and optical phase modulator An optical gate according to the invention comprises a polarization divider to divide an optical signal into two orthogonal polarization components and to output them as a first polarization component which precedes in the time base and a second polarization compone... | 04/27/2004 |
| 6724997 | Dispersion compensation in optical communication network and optical communication network The invention relates to a method for compensating signal dispersion in an optical communication network and to an optical communication network. The dispersion compensation is carried out by constructing the network in such a way that a route having an even number ... | 04/20/2004 |
