Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 8027588 | Systems and methods for optical carrier recovery In one embodiment a system and method pertain to generating a pump from a received optical signal, inputting the generated pump into a phase-sensitive oscillator, and amplifying a carrier component of the pump to generate an optical carrier having the same phase and... | 09/27/2011 |
| 7941049 | Optical transmission apparatus with optical amplifiers An optical transmission apparatus including an optical amplifier for providing a high-power optical amplifier on the receive side, in which a wavelength of pumping light for an optical amplifier on the transmission side is suitably shifted to be different from a wav... | 05/10/2011 |
| 7920793 | Inline repeater and optical fiber communication system An inline repeater that uses a forward-pumped DRA that can use a pumping light source such as an FBG pumping light source and a fiber laser, which are the most commonly used, and an optical fiber communication system are realized. The optical fiber communication sys... | 04/05/2011 |
| 7773884 | Method and apparatus for automatic shut-down and start-up of optical amplifiers in optical networks A method and apparatus for automatic shut-down and start-up of optical amplifiers in wavelength division multiplexed (WDM) optical networks include use of an optical channel monitor (OCM) to monitor loss and return of an input signal. By using the OCM to separately ... | 08/10/2010 |
| 7444077 | Optical transmission system, and pumping light source stopping device and method to be used in same system An optical transmission system includes an optical signal transmitter to output optical signal, a monitoring light transmitter to generate monitoring light, an optical multiplexer to output a multiplexed signal light by multiplexing the optical signal and monitoring... | 10/28/2008 |
| 7444078 | Transient control solution for optical networks An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node... | 10/28/2008 |
| 7418204 | Passive optical network system providing simultaneously both broadcasting service and data service A passive optical network system is disclosed that simultaneously provides both broadcasting service and data service. The passive optical network (PON) amplifies the optical signals for the broadcasting service in an optical amplifier media of the local office by p... | 08/26/2008 |
| 7408701 | Multi-frequency light source A multi-frequency light producing method and apparatus multiplies the number of optical channels present in an incident wavelength division multiplexed (WDM) signal light source by four-wave mixing (FWM) the WDM signal with at least one pump lightwave at least one t... | 08/05/2008 |
| 7398021 | Optical transmitter and passive optical network using the same An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and a third port, the circulator receiving the injection light at the fi... | 07/08/2008 |
| 7394995 | System and method for a compact optical receiver with wide dynamic range An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA. Optionally, a clock/data regenerator can be coupled to the electrical o... | 07/01/2008 |
| 7379671 | Optical transmitter An optical modulation processing section is provided which, in turn, includes a signal carrier-suppressed pulse modulating unit that performs signal carrier-suppressed pulse modulation on a light source signal to thereby create a CS-RZ signal, a phase modulating uni... | 05/27/2008 |
| 7366416 | Hub for a passive optical network hub A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing opt... | 04/29/2008 |
| 7359638 | Optical source generator for wavelength division multiplexing optical communication systems An optical source generator for wavelength-division-multiplexing optical communication systems includes a wavelength-division multiplexer/demultiplexer, optical amplifiers, and wavelength-dependent reflectors such as optical fiber-Bragg gratings or wavelength-indepe... | 04/15/2008 |
| 7349150 | Optical terminal apparatus An optical terminal apparatus includes a plurality of signal light units that transmits and receives a signal light having a predetermined wavelength; at least one pumping light unit that emits a pumping light having a predetermined wavelength to perform Raman ampli... | 03/25/2008 |
| 7346280 | Bi-directional long haul/ultra long haul optical communication link A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH ba... | 03/18/2008 |
| 7343097 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems including a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of the optical amplifiers are operated to provide net losses or net gain... | 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 |
| 7333686 | System and method for a re-configurable optical channel dropping de-multiplexer A re-configurable channel dropping de-multiplexer comprises an input, an output, a first 1×2 optical switch optically coupled to the input, a second 1×2 optical switch optically coupled to the output, a plurality of 2×2 optical switches optically coupled between ... | 02/19/2008 |
| 7327958 | Transient-based channel growth for optical transmission systems A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control techni... | 02/05/2008 |
| 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 |
| 7301981 | Methods for synchronized pulse shape tailoring A plurality of subresonators (12, 14), having different design configurations, share a common resonator section (18) such that the lasing action can be substantially synchronized to provide coherent laser pulses that merge the different respective puls... | 11/27/2007 |
| 7295252 | Control apparatus of audio-visual display apparatus and the control method A control apparatus of an audio-visual display apparatus is provided, wherein only one remote control unit in a plurality of remote control units has a control right for controlling the audio-visual display apparatus, the control apparatus determines whether a signa... | 11/13/2007 |
| 7289549 | Lasers for synchronized pulse shape tailoring A plurality of subresonators (12, 14), having different design configurations, share a common resonator section (18) such that the lasing action can be substantially synchronized to provide coherent laser pulses that merge the different respective puls... | 10/30/2007 |
| 7289735 | Apparatus for emitting light with controllable degree of polarization A laser apparatus is disclosed combining polarized light beams from two optical emitters into a combined beam of light with controllable degree of polarization (DoP). The laser apparatus includes a polarization combiner for combining the polarized beams into the com... | 10/30/2007 |
| 7280764 | Optical signal multiplexer/demultiplexer employing pseudorandom mode modulation An optical signal multiplexer/demultiplexer using an orthogonal pseudorandom (PRN) coding scheme for optical mode modulation to produce a plurality of independent optical signals that may be combined into one multiplex signal for transmission over an optical fiber t... | 10/09/2007 |
| 7280762 | Optical communication system having dynamic gain equalization An optical communication device, and related method, are provided for providing a tailored, spectrally non-uniform gain over a broad spectrum. In particular, the optical communication device includes an optical amplifier having a dynamic gain equalization (DGE) circ... | 10/09/2007 |
| 7280719 | Wideband optical module and PON using the same A wideband optical module includes a downward wideband light source for generating downward light, an upward wideband light source for generating upward light, a first circulator including a first to a third port for outputting multiplexed downward optical signals t... | 10/09/2007 |
| 7277636 | Optical communication apparatus and methods using pulses having modified propagation speeds An improved apparatus and method for enhancing the performance of optical transmission and network systems (such as SONET or SDH). A magnetically trapped atomic cloud chamber is provided which selectively alters the group velocity of light waves propagating through ... | 10/02/2007 |
| 7272316 | Wavelength-division-multiplexed optical source and passive optical network system employing the same A WDM optical source, in adopting a spectrum-sliced method, advantageously needs neither an optical source with specific generation wavelength nor a wavelength-stabilizing circuit for stabilizing wavelength. Affording high power and a very narrow line width, the WDM... | 09/18/2007 |
| 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 |
| 7266300 | BPSR optical transmission node A bi-directional path switched ring optical transmission node has simple configuration which reduces the influence of a wave reflected by an obstacle on optical line.The BPSR optical transmission node connects to a first optical line through which an odd channel sig... | 09/04/2007 |
| 7260058 | Timer based system for preventing mismatch in automatic protection switching A method for resolving primary section mismatch at a local node coupled to a remote node with two working sections is disclosed. A first working section is initially identified as the primary section and a second working section is initially identified as the second... | 08/21/2007 |
| 7254333 | Low-cost WDM terminal device accommodating plurality of client signal A WDM (Wavelength Division Multiplex) terminal device located in a WDM network includes a multiplexing unit that multiplexes a wavelength of a client signal having a single wavelength or a wavelength of at least one of a first plurality of client signals whose wavel... | 08/07/2007 |
| 7245422 | Raman optical amplifier, optical transmission system using the same, and raman optical amplification method An amplification medium is inputted thereto first lights and second lights, polarizations of which are orthogonal. A pumping means inputs first pump lights coinciding with the polarization of the first lights, and second pump lights coinciding with the polarization ... | 07/17/2007 |
| 7242519 | Raman amplifier and optical transmission system using the same It is an object of the present invention to provide a Raman amplifier capable of easily reducing the wavelength deviation of a Raman gain while suppressing system performance degradation, and an optical transmission system using such a Raman amplifier. To this end, ... | 07/10/2007 |
| 7236708 | Optical communication system with optical output level control function An optical communication system can increase a minimum optical reception level or the number of connectable optical receivers by controlling optical output levels of its optical transmitter. The optical communication system includes the optical transmitter having an... | 06/26/2007 |
| 7233742 | Optical communication system, method for supplying pump light, and distributed Raman amplifying apparatus An optical communication system according to the invention comprises: a transmitting station 11; an optical transmission line 12 for transmitting an optical signal sent from the transmitting station 11; a receiving station 13 for receivin... | 06/19/2007 |
| 7233720 | Devices based on optical waveguides with adjustable Bragg gratings A system for filtering light propagating in a waveguide is described. The system utilizes an adjustable periodic grating which induces mode coupling of predetermined frequencies of light propagating in the waveguide. ... | 06/19/2007 |
| 7228076 | Method for remodulation of a modulated optical signal and device for remodulation and transmission system A method for remodulation of a modulated optical signal is disclosed which uses a disturbed line signal and an optical clock signal derived from the undisturbed original line signal modulated with the bitrate frequency feeding both signals in a Raman amplifying fibe... | 06/05/2007 |
| 7224801 | Wireless secure device A method and apparatus for securely connecting one or more wireless peripheral devices such as keyboards, mice, gamepads, remote controllers, joysticks and one or more host systems such as personal computers or workstations, the secure connection reducing the vulner... | 05/29/2007 |
