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"I hate what they've done to my child...I would never let my own children watch it. "
Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 8433201 | Dynamic gain equalizer-monitor A dynamic gain equalizer-monitor (DGEM) includes a light modulator operable to modulate one or more component wavelengths of an input optical signal. The DGEM also includes a grating operable to receive one or more modulated component wavelengths from the light modu... | 04/30/2013 |
| 8401397 | Optical reception device, optical receiving method, and optical transmission apparatus An optical reception device is provided. The optical reception device includes a filtering unit that receives input light of predetermined power, filters the input light by use of filter characteristics where the degree of attenuation of the power of an optical sign... | 03/19/2013 |
| 8275267 | Method, system, and apparatus for filter implementation using hermitian conjugates Filter implementation using Hermitian conjugates and time division multiplexing (TDM) is disclosed to more efficiently compensate for chromatic dispersion of optical signals transmitted over a fiber optic medium. Embodiments for an input, filter, and output sections... | 09/25/2012 |
| 7983566 | Method for improving the performance of phase-modulated communication systems in an optical network A method and system for improving the performance of a differential-phase modulated optical communication system is disclosed. The system comprises a demodulator having a tunable element to adjust the free-spectral range (FSR) thereof, and a tunable phase shifter to... | 07/19/2011 |
| 7809277 | 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, ... | 10/05/2010 |
| 7747172 | Optical communication system having enhanced spectral efficiency using electronic signal processing An optical communication system combines strong electrical pre-filtering of data at the transmitter and digital feedback equalization (DFE) at the receiver to enhance spectral efficiency. The system can be applied to optical networking and digital communication syst... | 06/29/2010 |
| 7590356 | Variable dispersion compensator The present invention provides: (1) a compensator that compensates a wide range of amount of dispersion of light in a wide bandwidth band; and (2) a variable dispersion slope compensator applicable to the case where a transmission path suitable for a wavelength divi... | 09/15/2009 |
| 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 |
| 7424226 | Optical code division multiplexing communication method and system An optical code division multiplexing communication method includes the steps of: producing a multi-wavelength optical pulse train from wavelength multiplexing pulse; transmitting the multi-wavelength optical pulse train through a transmission line using a time-spre... | 09/09/2008 |
| 7418212 | Electrical detection of optical symbols A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7394986 | Flat top optical filtering component The invention relates to wavelength-selective optical filters for allowing light of a narrow optical spectral band, centered around a wavelength (λc) to pass through them, while reflecting the wavelengths lying outside this band. According to the inventi... | 07/01/2008 |
| 7389047 | Optical ring transmission network The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link “downlink” optical signals carried by respective wavelengths and receives “uplink” optical signals via the other end of the link. The link is divided i... | 06/17/2008 |
| 7385754 | Efficient wavelength referencing in a combined optical amplifier-optical channel monitor apparatus Efficient wavelength calibration in a WDM optical amplifier that includes an optical channel monitor (OCM) is obtained by introducing a notch into the amplified spontaneous emission (ASE) noise spectrum of the amplifier outside a WDM transmission band, and having th... | 06/10/2008 |
| 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 |
| 7369777 | Method and apparatus for automatically adjusting the optical power directed to a dispersion compensating element A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially compensating the WDM optical signal for dispersion that has ac... | 05/06/2008 |
| 7352971 | Broadband control of polarization mode dispersion A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelen... | 04/01/2008 |
| 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 |
| 7340187 | Optical signal monitoring method and apparatus In an optical signal monitoring method in wavelength multiplexing and an optical network, an area corresponding to a characteristic pattern of an eye pattern of an optical signal to be monitored, which characterizes a deterioration, is extracted from a database stor... | 03/04/2008 |
| 7339988 | Channel monitoring and identification and performance monitoring in a flexible high speed signal processor engine Systems and methods are disclosed to provide channel monitoring and/or performance monitoring for a communication channel. For example, in accordance with an embodiment of the present invention, an equalizer is disclosed that equalizes for channel distortions and al... | 03/04/2008 |
| 7333728 | 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, ... | 02/19/2008 |
| 7327956 | Method and apparatus for mitigating intersymbol interference from optical filtering A method and apparatus for mitigating intersymbol interference (ISI) from narrow-band optical filtering and improving transmission performance by filtering multichannel optical signals using an optical filter device that exhibits a desired loss ripple in the transmi... | 02/05/2008 |
| 7324758 | Optical dispersion monitoring apparatus and optical dispersion monitoring method, and optical transmission system using same An optical dispersion monitoring apparatus and an optical dispersion monitoring method are capable of monitoring dispersion accurately with a simple construction in an optical transmission system using the same. To this end, the optical dispersion monitoring apparat... | 01/29/2008 |
| 7319823 | Modulation scheme and transmission system for NRZ signals with left and right side filtering The invention shows a transmission system with a transmitter function, a transmitting fiber and a receiver function where the transmitter function comprising lightsources (1), modulators (2) and a multiplexer (3), and the receiver comprising at ... | 01/15/2008 |
| 7315575 | Equalization strategy for dual-polarization optical transport system A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a secon... | 01/01/2008 |
| 7302192 | Methods of spread-pulse modulation and nonlinear time domain equalization for fiber optic communication channels Methods, apparatus, and systems for an optical communication channel. A data signal is preconditioned prior to transmission over a fiber optic cable to minimize signal distortion and transmitted over a fiber optic cable. Preconditioning may include none, one or more... | 11/27/2007 |
| 7295738 | System and method for performing dispersion compensation An exemplary embodiment of the present invention includes an optical circulator. The circulator may have, for example, a first port, a second port, and a third port. The first port may be configured to introduce light into the optical circulator. The system may also... | 11/13/2007 |
| 7289739 | Polarization mode dispersion controller device and method for its operation A polarization mode dispersion (PMD) controller device for controlling the state of polarization of an optical light wave comprising a dispersion compensation unit (2; 25; 40) and an adaptation control unit (6; 28; 44), wherein the dispersion compensat... | 10/30/2007 |
| 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 |
| 7251396 | Device for tailoring the chromatic dispersion of a light signal A device for tailoring the chromatic dispersion of a multi-channel light signal is proposed. The device includes at least two waveguides coupled in a cascade, each provided with a spatially distributed optical filter. The group delay response of the filters is desig... | 07/31/2007 |
| 7236656 | Optical transport network An optical transport network comprises a monolithic transmitter photonic integrated circuit (TxPIC) InP-based chip and a monolithic receiver photonic integrated circuit (RxPIC) InP-based chip. ... | 06/26/2007 |
| 7221872 | On-line dispersion compensation device for a wavelength division optical transmission system The invention discloses an on-line dispersion compensation device for a wavelength division optical transmission system. The device is consisted of two optical path selectors and at least one chirped grating fiber unit. The chirped grating fiber unit is consisted of... | 05/22/2007 |
| 7218808 | Equalizer circuit for a light source An optical equalizer circuit for a light source, the optical equalizer circuit comprising M optical couplers linked by differential delay lines, wherein coupling ratios for the respective M optical couplers of the equalizer circuit are calculated based on an input s... | 05/15/2007 |
| 7212691 | Polarization-shaped duobinary optical transmission apparatus A polarization-shaped duobinary optical transmission apparatus is disclosed. The apparatus includes a light source that generates light having a continuous wave, an optical intensity modulator that converts the light into an optical intensity signal based upon an in... | 05/01/2007 |
| 7203400 | Dispersion compensating waveguide circuit A dispersion compensator having relatively uniform transmission characteristics over the bandwidth of a communication channel. The compensator is designed to process an optical signal corresponding to the communication channel by decomposing that signal into spectra... | 04/10/2007 |
| 7187873 | Compensation of polarization mode dispersion in single mode fiber for maximum-likelihood sequence estimation An output signal of a single mode fiber (SMF) is spectrally shaped to achieve characteristics of a predefined channel “target” response. The target response is that of a partial-response, maximum-likelihood channel with additive white Gaussian noise. A receiver ... | 03/06/2007 |
| 7184627 | Optical waveguide grating coupler incorporating reflective optical elements and anti-reflection elements An optical wavelength grating coupler incorporating one or more distributed Bragg reflectors (DBR) or other reflective elements to enhance the coupling efficiency thereof. The grating coupler has a grating comprising a plurality of scattering elements adapted to sca... | 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 |
| 7181145 | Optical communication multiplex device for vehicle and communication method using same The optical communication multiplex device for a vehicle comprises optical communication lines connecting a transmitting terminal (Tx) to a receiving terminal (Rx). Contact resistances are disposed near the optical communication line to generate heat for changing th... | 02/20/2007 |
| 7177545 | Optical filter and transmission system incorporating an optical filter The present invention propose an optical filter for filtering out at least a part of one of two spectral side-bands of a coded optical signal spectrum having a carrier wavelength, the first of said side-bands which is to be transmitted by said filter being called tr... | 02/13/2007 |
