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| Number | Title | Issue Date |
| 8064778 | Method and apparatus for controlling tunable transmitter chirp A fiber-optic transmission system includes a transmitter having a designed chirp value. The transmitter has first and second inputs for receiving first and second input signals, respectively, used to produce a modulated output signal. An optical fiber is responsive ... | 11/22/2011 |
| 7756423 | Wavelength division multiplexing optical transmission apparatus, wavelength division multiplexing optical transmission system and wavelength division multiplexing optical transmission method A wavelength division multiplexing optical transmission apparatus for transmitting wavelength division multiplexing optical signals, the apparatus including a plurality of optical transmitting units outputting optical signals having a different wavelength from each ... | 07/13/2010 |
| 7742705 | System and method for chirped light source A system and method for providing chirped light for an optical network. The system includes a light source configured to provide a light. The system additionally includes a driving signal source configured to provide a first driving signal. The system also includes ... | 06/22/2010 |
| 7623795 | Data compression apparatus and method therefor Routers for trunk telecommunication systems currently operate at 2.5 Gb/s. Next generation routers will be required to switch 128 input data streams into 128 output data streams, each data stream being at a data rate of 10 Gb/s. Current routers employ massively para... | 11/24/2009 |
| 7433605 | Adiabatic frequency modulated transmitter with negative chirp The invention, in one form, is a fiber optic system having an optical signal source adapted to produce a frequency and amplitude modulated optical digital signal and a semiconductor optical amplifier adapted to receive the frequency and amplitude modulated optical d... | 10/07/2008 |
| 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 |
| 7391550 | Method and apparatus for optical broadband frequency chirp Techniques for producing an optical broadband frequency sweep or chirp, include generating a narrowband frequency chirp and a frequency-shifted replica. The narrowband chirp has an optical carrier frequency, a pulse duration and a pulse bandwidth. A frequency-shifte... | 06/24/2008 |
| 7352970 | Dispersion management system for soliton optical transmission system A dispersion management system for soliton or soliton-like transmission systems comprises a length of optical fiber (L) in which a plurality of sections (I) made up of components (N,A) of opposite sign dispersions are concatenated together. The duration of the dispe... | 04/01/2008 |
| 7327957 | Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source The present invention relates to a wavelength-tunable light source whose output wavelength can be externally controlled and a wavelength-division multiplexed transmission system using the source. A wavelength-tunable light source in accordance with the presen... | 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 |
| 7305191 | Optical correlator system and supporting method and apparatus Multiple electrical signals (from, for example, multiple signal sources such as antennas) are converted by an electrical signal input (24) into corresponding optical signals. In one embodiment these electrical signals are comprised of temporally separated dat... | 12/04/2007 |
| 7266307 | Method and apparatus for pulse generation and adaptive pulse generation for optical communications One embodiment of the invention relates to producing optical pulses for use on a transmission link. A light source is configured to produce an optical signal. A pulse generator is coupled to the light source. The pulse generator is configured to receive, for a first... | 09/04/2007 |
| 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 |
| 7257332 | Optical transmitter and its control method An optical transmitter comprises an amplitude modulation unit performing amplitude modulation of only a one-side amplitude of a main signal with a low-frequency signal having a predetermined frequency. An optical modulator receives an input signal generated after th... | 08/14/2007 |
| 7254342 | Method and system for transmitting information in an optical communication system with low signal distortion A method is provided for transmitting information in an optical communication system that includes transmitting an optical information signal at a wavelength over an optical link with a first and second end. The optical information signal is pre-distorted for disper... | 08/07/2007 |
| 7245837 | Optical transmitting device A demultiplex unit demultiplexes the optical output of a Mach-Zehnder optical modulator and inputs the demultiplexed optical output to a wavelength detection unit. The wavelength detection unit detects the wavelength deviations in the ascending or descending part of... | 07/17/2007 |
| 7227681 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied An optical amplifier which amplifies a wavelength division multiplexed (WDM) optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes (a) an optical attenua... | 06/05/2007 |
| 7224516 | Multimode fiber optic amplifier and method of amplifying optical signals A multimode fiber receiver includes a multimode collimator, a multimode fiber optic amplifier and a detector. The collimator receives incoming signals and provides the signals to the amplifier. The amplifier includes plural amplification stages, a limiter, a tunable... | 05/29/2007 |
| 7173753 | Optical data receiver systems An optical data receiver for the distribution and demodulation of compressed TDM data packages comprises, optical distributor means to which the data packages are applied for selective distribution to a plurality of AWG optical demultiplexer/detector arrays, so that... | 02/06/2007 |
| 7164862 | Transmitting an optical signal with corresponding WDM and TDM channels An optical signal transmitter is disclosed that transmits an optical signal with corresponding Wavelength Division Multiplexing (WDM) channels and Time Division Multiplexing (TDM) channels. The transmitter is comprised of a laser, a dispersion system, and a modulato... | 01/16/2007 |
| 7149424 | Method and device for evaluating and improving the quality of transmission of a telecommunications signal through an optical fiber A system and method for improving the transmission quality of a WDM optical communications system begins by determining the bit-error rate for an optical channel before forward error correction is performed at a receiver. The pre-corrective bit-error rate is fed bac... | 12/12/2006 |
| 7139478 | Nonlinear device comprising a spectrally broadening fiber Embodiments of the invention include system for monitoring the effectiveness of pulse shaping in a nonlinear optical fiber (40). The spectral content of the pulse, after passing through the nonlinear fiber (40), provides an indication of how effectivel... | 11/21/2006 |
| 7136596 | Optical pulse addition device SC light is generated from the input signal 2, of an OTDM signal light 1 with wavelength λs1 and an input signal 2 with wavelength λs2 using an optical fiber and the like, and the wavelength of the SC light is converted i... | 11/14/2006 |
| 7116918 | 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 positive is performed for an optical signal on a transmitting side. Each of the repeaters includes a dispersion-compen... | 10/03/2006 |
| 7113327 | High power fiber chirped pulse amplification system utilizing telecom-type components An erbium fiber (or erbium-ytterbium) based chirped pulse amplification system is illustrated. The use of fiber amplifiers operating in the telecommunications window enables the implementation of telecommunications components and telecommunications compatible assemb... | 09/26/2006 |
| 7103281 | Communications network A device and method for correcting for timing jitter of an optical data pulse in an optical transmission system. During transmission, a data pulse may suffer jitter. Its arrival time at a node may be temporally offset from its predicted arrival time. Data pulses are... | 09/05/2006 |
| 7099597 | Method of adaptive signal degradation compensation An iterative process is used to set the phase prechirp of a WDM optical transport system to a system's optimal level that maximizes the signal quality. A signal degradation factor takes into account linear and non-linear effects along the optical path and is used as... | 08/29/2006 |
| 7095772 | Extreme chirped/stretched pulsed amplification and laser Methods, devices and systems for generating ultrashort optical linear chirped pulses with very high power by amplifying the pulses so that their temporal duration is longer than the storage time of the amplifying medium. The additional gain factor is related to the ... | 08/22/2006 |
| 7094204 | Coded excitation imaging for use with bipolar, unipolar and other waveforms Sidelobe levels of bipolar and unipolar waveforms are suppressed. Bipolar and unipolar transmit waveforms are generated with a coded excitation, such as a chirp coding, and pulse width modulation. For harmonic, such as second harmonic, imaging, the fundamental trans... | 08/22/2006 |
| 7058314 | Method and system for reducing intra-channel nonlinear effects in highly dispersed optical pulse transmission A system and method for reducing timing and amplitude jitter in trnasmission of Retrun-to-Zero modulated pulses is described. In the reduction of amplitude jitter the modulated pulses must be phase coherent. The method comprises the steps of measuring a total disper... | 06/06/2006 |
| 7016615 | System comprising a single-stage all-pass optical filter A single-stage all-pass optical filter is disclosed that may be applied to generate a large tunable delay of an optical pulse train. The all-pass optical filter includes an input port for receiving an input optical pulse having a regular repetition rate; an output p... | 03/21/2006 |
| 6999678 | Adaptive method for chirping an optical data signal An adaptive method is provided for applying chirp to an optical signal traversing through an optical network. The adaptive method comprises: applying chirp to an optical data signal at a transmitter in the optical network; transmitting the optical data signal throug... | 02/14/2006 |
| 6959031 | Method and system for fast acquisition of pulsed signals A method and system for fast acquisition of pulsed radio signals where said signals comprised uniquely-spaced pulses or symbols. The receiver searches for and detects two ore more symbols, determines the interval or intervals between the symbols, and because the int... | 10/25/2005 |
| 6937108 | Methods and apparatus for offset chirp modulation A method and apparatus for producing a modulation scheme usable in conjunction with information transmission and reception via waveforms, such as electromagnetic waves. The modulation scheme is usable for such purposes as resolving range ambiguities and overcoming f... | 08/30/2005 |
| 6934479 | Wavelength division multiplexing optical communication system and wavelength division multiplexing optical communication method The object of the present invention is to provide a WDM optical communication system and a WDM communication method wherein deviation of transmission characteristics of optical signals of respective wavelengths is reliably controlled, based on reception information ... | 08/23/2005 |
| 6925262 | Method and system for compensating chromatic dispersion Disclosed herein are a method and system for compensating chromatic dispersion. The method includes the steps of generating WDM signal light by wavelength division multiplexing a plurality of optical signals having different wavelengths, transmitting the WDM signal ... | 08/02/2005 |
| 6917764 | Predistortion circuit with combined odd-order and even-order correction An apparatus and associated method for generating predistortion IMD in a predistortion circuit. The method comprising adjusting the bias voltage, adjusting the bias current; adjusting the gain of the amplifier; and adjusting the differential bias current flowing thr... | 07/12/2005 |
| 6876818 | Method and system for transmitting signals with spectrally enriched optical pulses A system and method for transmission of data modulated spectrally enriched optical pulses via an error free propagation region of an optical fiber, in which the optical pulses generated by an optical transmitter have a spectrum that is substantially wider than the s... | 04/05/2005 |
| 6856770 | Method and system for transmitting signals with spectrally enriched optical pulses A system and method for transmitting data modulated spectrally enriched optical pulses with a frequency chirp via an error free propagation region of an optical fiber, in which spectrum of optical pulses gradually depletes from the spectrum that is substantially wid... | 02/15/2005 |
