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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 8135280 | Method and system for power stability control in wavelength division multiplexing networks Methods and systems for controlling power fluctuations in a network including a plurality of nodes are disclosed. A node in the network may be configured to modify power levels in accordance with either an active state or an inactive state. The node may transition t... | 03/13/2012 |
| 8126331 | Wavelength division multiplexing transmission device and wavelength division multiplexing transmission method The power level of a wavelength division multiplexed optical signal is detected by a detection unit. When the power level of the optical signal detected by the detection unit is equal to or lower than a first threshold, the coupling direction of an attenuation unit ... | 02/28/2012 |
| 8064770 | System and method for spectral loading an optical transmission system A system and method for spectral loading unutilized channels of a partially loaded WDM system may be used to suppress spectral hole burning (SHB). Dummy tones may be loaded at different loading wavelengths within the band of system wavelengths such that the loading ... | 11/22/2011 |
| 8064771 | Active control loop for power control of optical channel groups A system, apparatus and method are described for deployment of a control loop between optical or electro-optical modules and a multiplexing module to provide a desired power profile of banded optical channel groups. The power output characteristics of the optical or... | 11/22/2011 |
| 7962039 | Multiple wavelength light source, and generation method for multiple wavelength light It is an object of the present invention to provide a multiple wavelength light source capable of generating lights of more wavelengths, and a generation method for multiple wavelength light using a multiple wavelength light source. A multiple wavelength ligh... | 06/14/2011 |
| 7822345 | Output stage for carrying out WDM message transmission and methods for exchanging full light sources in an output stage of this type An output stage for WDM information transmission transmits a plurality of carrier waves modulated by an information signal and a filling lightwave. A first control circuit controls a desired power signal which determines the power of the filling light source so that... | 10/26/2010 |
| 7738791 | Transmitter and method for transmitting messages on an optical fiber For transmitting information on an optical fiber, a plurality of information carrier channels at different carrier frequencies and a plurality of filling channels are used. The filling channels are transmitted together with the information carrier channels along the... | 06/15/2010 |
| 7672592 | Optical transmitter system An optical transmitter system supplies a plurality of different wavelength optical radiation components to a transmission element which, in operation, is connected to the transmitter system for conveying the different wavelength radiation components to a respective ... | 03/02/2010 |
| 7660530 | Optical transmission apparatus, optical transmission system, and optical transmission control method An optical transmission apparatus includes a transmitting unit for transmitting an optical signal with a specified wavelength, a multiplexing unit for multiplexing the optical signal with the specified wavelength and an optical signal with a wavelength other than th... | 02/09/2010 |
| 7627248 | Method for pre-emphasis of optical signals in a transmission system comprising add-drop-modules A method for pre-emphasising transmitted signals in channels for multiplex signals along a transmission path comprising supply and/or branch points is provided. According to the method, relative degradations of the signal-to-noise intervals between transmitted signa... | 12/01/2009 |
| 7623790 | Signal identification method A signal identification method for efficiently identifying Dense Wavelength Division Multiplexing (DWDM) channel modulation formats, signal powers, and center frequency detuning of signals that may be used in conjunction with telecom-grade monitoring equipment. The ... | 11/24/2009 |
| 7596320 | Preemphasis of an optical wavelength multiplex signal Methods are described for preemphasizing an optical multiplex signal that comprises a plurality of signals having different wavelengths, which are transmitted by a transmitter to a receiver. Power levels for the signals are set at the transmitter and measured at the... | 09/29/2009 |
| 7574138 | Dynamic control of the level of degradation of optical signals in a transparent optical communication network A device (D2) is dedicated to controlling degradation parameters associated with signals on channels with different wavelengths, possibly arranged in bands of channels, and transmitted by transmission lines (Lj) connecting nodes (Ni) of a transparent optical ... | 08/11/2009 |
| 7526205 | Transmission system A wavelength division multiplexing transmission system, the system comprising: a plurality of channels at different wavelengths, each channel comprising a transmitter, a receiver, and one or more amplifiers, the system further comprising an encoder for encoding data... | 04/28/2009 |
| 7515829 | Wavelength division multiplexing optical transmission system A WDM optical transmission system of the invention has a configuration where WDM light generated at a wavelength multiplexing station is transmitted via a plurality of stations such as optical add-drop stations, arranged on an optical transmission line, and control ... | 04/07/2009 |
| 7486892 | Multiport optical amplifier with narrowcast power equalization Apparatus and method for equalizing a multiplicity of amplifier optical output signals comprised of a combined broadcast optical signal and a narrowcast optical signal having different bands of wavelengths of light by adjusting the power output level of at least one... | 02/03/2009 |
| 7444079 | Optical power control monitor for multiple wavelength fiber-optic networks An optical control monitor and a method for adjusting for changes in optical signals transmitted through an optical network. The method comprises the steps of transmitting a set of optical signals through a network, each of the optical signals having a respective wa... | 10/28/2008 |
| 7440698 | Optical transmitter system An optical transmitter system supplies a plurality of different wavelength optical radiation components to a transmission element which, in operation, is connected to the transmitter system for conveying the different wavelength radiation components to a respective ... | 10/21/2008 |
| 7437083 | Wavelength converter A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 7424221 | Optical network terminal with illegal transmission detection circuitry An optical network terminal, which includes an optical transmitter, monitors the status of the optical transmitter, such as the output or the power consumption of the optical transmitter, to determine when the optical transmitter is illegally transmitting. When an i... | 09/09/2008 |
| 7398023 | Method and apparatus for bias and alignment control in an optical signal transmitter A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals m... | 07/08/2008 |
| 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 |
| 7391973 | Two-stage gain equalizer An apparatus for selectively adjusting power levels of component signals of a wavelength division multiplexed signal. The apparatus comprises a first filter and a second filter. The first filter modulates the component signals according to a static attenuation profi... | 06/24/2008 |
| 7389045 | Apparatus and method for monitoring and compensating an optical signal Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate a first signal; a signal generator configured to provide a second si... | 06/17/2008 |
| 7379668 | Optical amplification in photonic switched crossconnect systems An improved photonic switch having optical amplification is described. Signals are amplified before they are switched, after they are switched, or both before and after they are switched. The optical amplification compensates for fixed losses within the switch and t... | 05/27/2008 |
| 7376348 | Optical communication system An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission ... | 05/20/2008 |
| 7366197 | Method and apparatus for adapting GBIC module to coupled Ethernet switch capable of outputting different voltages The present invention is to provide method and apparatus for adapting a GBIC module to an Ethernet switch capable of outputting one of different voltages in which in a case of the GBIC module coupled to the Ethernet switch, a DC converter of the GBIC module is adapt... | 04/29/2008 |
| 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 |
| 7336901 | Reconfigurable optical add-drop multiplexers employing optical multiplex section shared protection A reconfigurable optical add-drop multiplexer is disclosed that enables Optical Multiplex Section (OMS) shared protection rings. The ROADM comprises a first optical supervisory module, coupled to a first amplifier module, which in turn is coupled to a first broadcas... | 02/26/2008 |
| 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 |
| 7321733 | Split-band optical transmission system and optical transmission method used therein An optical transmission system including an optical transmitting device and an optical receiving device. The optical transmitting device includes a data signal splitting section for splitting data signal information into at least two parts and generating at least tw... | 01/22/2008 |
| 7308200 | Pre-emphasis control method in consideration of nonlinear deterioration A pre-emphasis control method automatically and appropriately performs the pre-emphasis of each wavelength in a wavelength division multiplexing communications system. Before instructing pre-emphasis for a transmitting unit, the optical power of an optical signal of... | 12/11/2007 |
| 7289734 | Method and system for multi-level power management in an optical network A method and system for multi-level power management in an optical network is provided. They include three levels of power equalization. The first level of power management equalizes the powers of channels in a band of channels. The second level of power management ... | 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 |
| 7286771 | Multi-channel optical transmitter incorporating a tunable optical signal source and method for transmitting a multi-channel optical signal The multi-channel optical transmitter is composed of a tunable optical signal source, an optical multiplexer and an intensity reducer. The tunable optical signal source includes a tunable laser, and additionally includes an optical signal output through which it out... | 10/23/2007 |
| 7280763 | Terminal apparatus and controlling method for optical output power A terminal apparatus by which, even where BER data, for example, of an optical signal of an existing wavelength cannot be utilized, the optical output powers of the existing wavelength and an extension wavelength can be adjusted in a short period of time while elimi... | 10/09/2007 |
| 7280761 | Device and method for setting add signal level for OADM system An optical level calculator calculates optical powers of individual wavelengths of a through wavelength division multiplexed signal based on an input level monitor, network information, and insertion loss information 5, and obtains an optimum level for an add... | 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 |
| 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 |
