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 |
| 7970286 | Optical transmission device In a wavelength-division multiplexing communications system including a plurality of optical transmission devices having an optical amplifier, downstream optical transmission devices transmit gain wavelength characteristic information of an optical amplifier in each... | 06/28/2011 |
| 7903978 | Optical transmission systems and amplifier control apparatuses and methods Optical systems of the present invention generally include an optical signal controller disposed along an optical link between two optical nodes. The optical signal controller is configured to provide a monitoring signal from an optical signal passing between the no... | 03/08/2011 |
| 7729620 | Methods and systems for controlling optical power attenuation Methods and systems for controlling optical power attenuation are provided. A method comprises periodically measuring an optical power of an optical signal received by an optical receiver and periodically measuring a first attenuation control signal voltage. When th... | 06/01/2010 |
| 7509055 | Optical transmission system with automatic signal level adjustment and startup functions An optical transmission system with automatic startup functions to optimize the power level of optical signals entering each optical amplifier and operate those amplifiers in appropriate mode. In the process of starting up an optical transmission system, upstream an... | 03/24/2009 |
| 7436583 | Optical amplification fiber, optical amplifier module, optical communication system and optical amplifying method The present invention relates to an optical amplification fiber and others capable of effectively reducing nonlinear interaction between signal channels even in transmission of multiplexed signal light containing multiple signal channels arranged in high density and... | 10/14/2008 |
| 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 |
| 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 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 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 |
| 7359113 | Semiconductor optical amplifier having a non-uniform injection current density A semiconductor optical amplifier (SOA) with efficient current injection is described. Injection current density is controlled to be higher in some areas and lower in others to provide, e.g., improved saturation power and/or noise figure. Controlled injection curren... | 04/15/2008 |
| 7358818 | Optical receiver for an optical communication The present invention provides an optical receiver operable for optical signals each having different transmission speed. The optical receiver includes a light-receiving device, a pre-amplifier, a main amplifier, and a control circuit. The pre-amplifier, may be a tr... | 04/15/2008 |
| 7343102 | Optical transmission system with automatic signal level adjustment and startup functions An optical transmission system with automatic startup functions to optimize the power level of optical signals entering each optical amplifier and operate those amplifiers in appropriate mode. In the process of starting up an optical transmission system, upstream an... | 03/11/2008 |
| 7339725 | 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... | 03/04/2008 |
| 7319817 | System for transparent node for WDM shared “virtual ring” networks A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on “virtual rings”. All wavelengths are sourc... | 01/15/2008 |
| 7295782 | Control method and optical data transmission path for compensating changes in SRS-induced power exchange Control method and optical data transmission path having a device for determining the tilting of the spectrum, and having a quick control and slow control for compensating the tilting of the spectrum. ... | 11/13/2007 |
| 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 |
| 7277647 | System and method of optical transmission Minimum shift keying (MSK) is used as the coding scheme in a high bit rate optical transmission system, and the signal format is either RZ (return-to-zero) or NRZ (non-return-to-zero). The system can combine multiple individual channels with different wavelengths in... | 10/02/2007 |
| 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 |
| 7272325 | Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio In the WDM systems, the OSNR and the signal loss among the optical signals are substantially minimized at the receiving terminal to combat the SRS effects. An equal amount of the signal loss is expected for every span in the transmission path so that the optical amp... | 09/18/2007 |
| 7263296 | Optical transmission system using in-line amplifiers In a system connecting a transmitter and a receiver using transmission paths and repeaters (in-line amplifiers), red chirping whose α parameter is performed for an optical signal on a transmitting side. Each of the repeaters includes a dispersion-compensator for co... | 08/28/2007 |
| 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 |
| 7254334 | Multiplex optical communication system A multiplex optical communication system transmitting a multiplex optical signal between terminal equipments each including converters producing optical signals combined to the multiplex optical signal, through repeater equipment including an optical amplifier, unde... | 08/07/2007 |
| 7242864 | Technique for power control in optical networks A technique for maintaining a required value of power per optical communication channel in a chain of optical nodes (112, 114, 118, 116) connected by optical fiber spans (111, 119, 121), wherein at least some of the nodes include optical amplifiers ( | 07/10/2007 |
| 7233432 | Pre-emphasized optical communication In one of several embodiments, a method of communicating optical signals comprises communicating a plurality of optical signals over an optical communications medium, wherein each of at least some of the plurality of optical signals comprises a launch power that is ... | 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 |
| 7215463 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems of the present invention include 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 amplifier are operated to provide ... | 05/08/2007 |
| 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 |
| 7209662 | Wavelength multiplex transmission device The wavelength multiplex transmission device of the present invention includes a block band unit (block dispersion compensating unit etc.) for subjecting a plurality of signal lights of different wavelengths to dispersion compensation on a band basis and outputting ... | 04/24/2007 |
| 7206512 | Method of controlling optical wavelength division multiplexing transmission apparatus A method of controlling an optical wavelength division multiplexing transmission apparatus achieves stable wavelength division multiplexing optical transmission by switching a control mode of an optical amplification section in accordance with an input state of opti... | 04/17/2007 |
| 7199920 | Two stage optical amplifier The invention describes a two-stage optical amplifier adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifier in a way suitable for forming unidirectional and bi-directional configurations useful in optical net... | 04/03/2007 |
| 7197245 | System and method for managing system margin An optical communication system is operable to communicate a plurality of wavelength signals at a bit rate of at least 9.5 gigabits per second over a multiple span communication link spanning at least 400 kilometers without optical regenerators. The plurality of wav... | 03/27/2007 |
| 7194210 | Wavelength division multiplexing optical transmission equipment and method of amplifying optical wavelength division multiplexed signals Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration. ... | 03/20/2007 |
| 7177541 | OSNR monitoring method and apparatus for the optical networks It is disclosed that a method and apparatus that automatically monitors each channel's optical signal-to-noise ration (OSNR) using optical filter and polarization extinction method in wavelength division multiplexing (WDM) scheme-based optical transmission systems. ... | 02/13/2007 |
| 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 |
| 7158698 | Module for amplifying signal light with remote excitation-light and optical-fiber communication system including the same A module for amplifying a signal light with a remote excitation-light, includes (a) a first optical input/output line through which a signal light is transmitted, (b) a second optical input/output line through which a signal light is transmitted, (c) an optical ampl... | 01/02/2007 |
| 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 |
| 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 |
| 7133611 | Main signal controlling apparatus and method in a WDM optical communications system If a repeater supervisory control (SV), a pre-emphasis automatic adjustment (PE), a receiving side threshold value automatic adjustment (Vth), a transmitting side dispersion compensation value setting (VDC(T)), and a receiving side dispersion compensation value sett... | 11/07/2006 |
| 7127173 | Method of adjusting power for a wavelength-division multiplexed optical transmission system Adjusting power for a WDM optical transmission system comprising emitter means, an optical transmission line, and receiver means, the method being characterized in that for each wavelength channel, the power emitted for said channel by the emitter means is adjusted ... | 10/24/2006 |
| 7116687 | High repetition rate passively Q-switched laser for blue laser based on interactions in fiber A laser apparatus is disclosed. The apparatus includes a Neodymium-doped lasing material having first and second surfaces and a passive Q-switch optically coupled to the second surface. The first-surface is substantially transparent to a pump radiation and substanti... | 10/03/2006 |
