Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7853149 | Transmitter frequency peaking for optical fiber channels Frequency peaking is used in the transmitter to improve link performance. In one example, frequency peaking improves the PIED or TWDP. The frequency peaking can result in pulse shapes that have more electrical energy in the receiver (and therefore higher ... | 12/14/2010 |
| 7660529 | System and method for providing failure protection in optical networks A system and method for transmitting an optical signal. The system includes a first optical transmitter capable of transmitting a first optical signal under one or more first operating conditions, and the first optical signal corresponds to a first wavelength. Addit... | 02/09/2010 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7379672 | Photonic RF distribution system The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for generating optical signals. A first optical source (42) is opera... | 05/27/2008 |
| 7343094 | Transmission characteristics evaluation system and pseudo transmission path apparatus thereof A transmission characteristics evaluation system can measure the dispersion tolerance and the insertion loss gradient tolerance at a high precision with reduced number of working steps for the measurement in evaluating the transmission characteristics of an optical ... | 03/11/2008 |
| 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 |
| 7324569 | Method and system for spectral stitching of tunable semiconductor sources A multi semiconductor source tunable spectroscopy system has two or more semiconductor sources for generating tunable optical signals that are tunable over different spectral bands. The system enables the combination of these tunable signals to form an output signal... | 01/29/2008 |
| 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 |
| 7302182 | Methods and apparatus for sensing multiple wavelengths simultaneously in a single wavelength sensing device A method and system provide for sensing multiple wavelengths simultaneously in a single wavelength sensing device. The system may have a plurality of laser signals and a plurality of identifiable modulation signals. A respective laser signal of the plurality of lase... | 11/27/2007 |
| 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 |
| 7277648 | Network element for use in an optical communication network, in particular a DWDM communication network The present invention relates to an optical communication network and to a network element for use in such a network. The network element comprises a plurality of receivers (70-76) for receiving optical communication signals, a plurality of transmitter... | 10/02/2007 |
| 7254338 | Multi-wavelength light source A multi-wavelength light source unit for optical communication system is disclosed. The light source includes a demultiplexer for demultiplexing a multiplexed light signal into a plurality of lights having different wavelengths and a multiplexer that receives the de... | 08/07/2007 |
| 7251385 | Wavelength multiplexing on-chip optical interconnection circuit, electro-optical device, and electronic apparatus To provide a wavelength multiplexing on-chip optical interconnection circuit, an electro-optical device, and an electronic apparatus, wherein a signal transmission speed can be enhanced, fineness can be easily accomplished, and they can be simply manufactured, the w... | 07/31/2007 |
| 7248799 | Method and an improved device for controlling the power delivered at the output of a node of an optical network that switches bands of wavelengths A device (D) is dedicated to controlling the power of optical signals in a transparent switching node of an optical communication network that switches bands of wavelengths. The device includes, firstly, a controller (12) for comparing input optical power mea... | 07/24/2007 |
| 7233741 | Optical exchange for wavelength division multiplexed (WDM) network, and optical exchange method for WDM network An optical exchange for a wavelength division multiplexed (WDM) network performs a switching operation on a plurality of optical signals, which are input via a plurality of input ports, and outputs the resulting optical signals to a plurality of output ports, which ... | 06/19/2007 |
| 7174098 | Apparatus and method for monitoring optical signal This invention provides a technique for realizing low-cost optical signal waveform monitoring with improved realtimeness to be applied to signal quality monitoring in an actual optical transmission system, and a technique for stably controlling an optical transmitte... | 02/06/2007 |
| 7171127 | Optical transmission controller An optical transmission controller includes a semiconductor-laser, a semiconductor laser driver, a monitor photoreceptor, a waveform detector and a phase relation adjuster. The semiconductor laser driver allows the semiconductor laser to output an optical signal. Th... | 01/30/2007 |
| 7161725 | Frequency locker A method and assembly for frequency stabilization of an optical signal especially from a laser, the assembly (11) comprising beam splitter (15), a passive frequency discriminator (16), and a pair of photodiodes (17 & 18). The beam ... | 01/09/2007 |
| 7146107 | Method and apparatus for adjusting filter device A tunable dispersion compensator whose passband center wavelength changes when the amount of dispersion compensation is changed is suitably adjusted. The relationship between temperature for keeping the center wavelength constant and the amount of dispersion compens... | 12/05/2006 |
| 7113705 | Methods and apparatus for sensing multiple wavelengths simultaneously in a single wavelength sensing device A method and system provide for sensing multiple wavelengths simultaneously in a single wavelength sensing device. The system may have a plurality of laser signals and a plurality of identifiable modulation signals. A respective laser signal of the plurality of lase... | 09/26/2006 |
| 7113709 | Redundant WDM transmission system optical receiver with reduced variable optical attenuators and/or variable dispersion compensation modules An optical receiver including a variable optical attenuator for controlling an optical loss value for each optical transmission line based on a predetermined optical loss value; a variable dispersion compensation module for controlling a wavelength dispersion value ... | 09/26/2006 |
| 7092638 | Optical multiplex communication system, optical transmission apparatus, and control method of optical multiplex communication An optical multiplex communication system includes a transmission part and a receiving part, wherein the transmission part includes a transmission quality detecting part which measures and transmits a transmission quality information for the channels based on a requ... | 08/15/2006 |
| 7085496 | Passive add/drop amplifier for optical networks and method An add/drop node for an optical network comprises a passive splitter to split an ingress signal from the network into a first ingress signal and a second ingress signal. A first amplified splitter stages module is operable to passively split and amplify the first in... | 08/01/2006 |
| 7009705 | Active remote sensing using lock-in amplifiers and beam steering A remote sensing platform for sensing a target may include a source configured to emit optical radiation toward the target. A device may be configured to dither the emitted optical radiation to alternately illuminate a number of locations on the target. A first dete... | 03/07/2006 |
| 6999686 | Wavelength management in an optical network A system for managing signals in an optical network is provided. When a signal is originated by a source node for transmission to a destination node, the source node generates a message. Upon receiving this message, the destination node responds by sending an acknow... | 02/14/2006 |
| 6961522 | Automatic raman gain and tilt control for ultra-long-distance dense WDM optical communication system An approach for automatic Raman gain and tilt control for a WDM (Wavelength Division Multiplexing) optical communication systems is disclosed. An optical fiber carries a plurality of optical signals, in which at least one of the optical signals are reference signals... | 11/01/2005 |
| 6941079 | Optical demultiplexer with multi-channel power control and tilt compensation Systems and methods for controlling power of WDM channels in a WDM receiver. A preamplifier is provided prior to a demultiplexer in the WDM receiver chain. The gain of the preamplifier may be controlled based on power measurements made on individual WDM channels. A ... | 09/06/2005 |
| 6931213 | Regenerator for a wavelength division multiplex transmission system The invention relates to wavelength division multiplex fiber optic transmission systems. It proposes a regenerator including a demultiplexer for separating the signals of various channels, a plurality of optical modulators each receiving signals from the demultiplex... | 08/16/2005 |
| 6917735 | Apparatus for interrogating an optical signal Apparatus (10) for interrogating an optical signal (not shown) propagating in an optical waveguide, such as an optical fiber, having an input section (12) and a second section (14) through which light entering from the input section (12) ... | 07/12/2005 |
| 6907201 | Optical power transient control system and method A system and method for optical power transient control and prevention in communication networks. An optical signal propagating on a network is demultiplexed into individual spectral bands, e.g. at an OADM, and an optical power monitor point is included into each ba... | 06/14/2005 |
| 6895141 | Control method and device for optical filter, and optical node device In the control method for the optical filter according to the present invention, WDM signal light obtained by wavelength division multiplexing a plurality of optical signals having different wavelengths is supplied to an optical filter to obtain output WDM signal li... | 05/17/2005 |
| 6782157 | Bidirectional optical interleaver The abstract is amended to read, “An inventive method and apparatus is provided by a bidirectional optical 1×2 device formed by a cascade of three optical 2×2 devices. Each 2×2 device is bidirectional where optical signals propagate through the 2×2 device in t... | 08/24/2004 |
| 6661946 | Method of controlling optical signal power at an add/drop node in a WDM optical communication system Optical signal power levels for selected optical channels processed within an add/drop node in a wavelength division multiplexed (WDM) system are adjusted as a function of variations in signal power in an incoming WDM signal caused by gain ripple. In part... | 12/09/2003 |
| 6628448 | Optical spectrum slicer An optical spectrum slicer capable of converting and outputting discontinuous spectrum lights having spectral components at a desired wavelength spacing from a broad band continuous spectrum light, with a simple constitution and at a reduced cost, the sli... | 09/30/2003 |
| 6619864 | Optical channel monitor with continuous gas cell calibration The invention includes a method and apparatus for monitoring wavelength of an optical channel. A tunable optical bandpass filter is used to correlate a signal from an optical transmission line with a signal from a reference light source. The signal from t... | 09/16/2003 |
| 6616351 | Bidirectional optical amplifying apparatus and optical gain controlling method in a bidirectional WDM optical communication network A bidirectional optical amplifying apparatus-and method of controlling the optical gain in a bidirectional WDM optical communication network includes a bidirectional optical amplifier for amplifying a forward WDM optical input signal and a reverse WDM opt... | 09/09/2003 |
| 6323976 | Light source device for frequency division multiplexed optical communications The object of the invention is to offer a light source device for frequency division multiplexed optical communications having a compact size and reduced cost. Light source units 100-300 output light having optical frequencies which oscillate at mutually ... | 11/27/2001 |
