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| Number | Title | Issue Date |
| 8160455 | Method and apparatus for generating signals with increased dispersion tolerance using a directly modulated laser transmitter An optical transmitter is disclosed wherein a signal processor receives a data stream and outputs a drive signal for a laser, where the drive signal encodes each bit of the data stream according to the values of adjacent bits effective to compensate for spreading of... | 04/17/2012 |
| 8131157 | Method and apparatus for generating signals with increased dispersion tolerance using a directly modulated laser transmitter An optical transmitter is disclosed wherein a modulating signal, such as an NRZ signal, encoding data is combined with a time derivative of the modulating signal and coupled to a directly modulated laser in order to generate artificial transient chirp in the output ... | 03/06/2012 |
| 8036539 | Gigabit ethernet longwave optical transceiver module having amplified bias current An optical transceiver module configured for longwave optical transmission is disclosed. Significantly, the transceiver module utilizes components formerly used only for shortwave optical transmission, thereby reducing new component production and device complexity.... | 10/11/2011 |
| 7970288 | Electronic system with APC An electronic system comprises an automatic power control (APC) unit, an adjustment unit, and a calibration unit. The automatic power control (APC) unit receives a first input signal and a second input signal and generates an output signal. An adjustment unit couple... | 06/28/2011 |
| 7962044 | Temperature stabilizing packaging for optoelectronic components in a transmitter module An optical transmitter is disclosed having a temperature stabilization system for an optical filter for maintaining constant the frequency response of the filter. The filter is mounted within a housing having a substantially higher thermal conductivity. The housing ... | 06/14/2011 |
| 7899335 | Optical transmitter circuit A light emitting element driving differential switch (2) includes first and second transistors (M1, M2). A third transistor (M3) is connected as an auxiliary switch in parallel to the first transistor (M1) whose drain is connected ... | 03/01/2011 |
| 7881621 | Optical transmission system with directly modulated laser and feed forward noise cancellation An optical transmitter for generating a modulated optical signal for transmission over a fiber optic link to a remote receiver including a laser; an input coupled to the laser for directly amplitude modulating the laser with an RF signal to produce an optical signal... | 02/01/2011 |
| 7873285 | Anti clipping circuit for laser transmitters This anti clipping circuit is for a laser transmitter used to transmit sub-carrier multiplexed signals for CATV applications. The circuit design is based on actual clipping measurements showing the specific time and duration of the clipping events is random. The ind... | 01/18/2011 |
| 7853154 | Bias circuit for burst-mode/TDM systems with power save feature An optic signal transmit system and biasing method and apparatus and system is disclosed to reduce power consumption during non-transmit periods. An optic signal generator receives a bias signal and an outgoing signal. A burst/transmit enable signal enables the tran... | 12/14/2010 |
| 7769303 | Apparatus and method for generating return-to-zero signal Provided are an apparatus and a method for generating a return-to-zero (RZ) signal, including: a first modulator receiving a first signal having a predetermined frequency to modulate, compensate for and output a first laser beam; a second modulator receiving a secon... | 08/03/2010 |
| 7734191 | Forward error correction (FEC) enabled photonic integrated circuit (PICs) chips with multiple signal channels A forward error correction (FEC) communication device that includes a transmitter photonic integrated circuit (TxPIC) or a receiver photonic integrated circuit (RxPIC) and a FEC device for FEC coding at least one channel with a first error rate and at least one addi... | 06/08/2010 |
| 7693428 | Optical orthogonal frequency division multiplexed communications with nonlinearity compensation The present invention discloses a transmitter and receiver for optical communications system, which provide compensation of the optical link nonlinearity. M-PSK modulating is used for data embedding in an optical signal in each WDM channel using orthogonal frequency... | 04/06/2010 |
| 7693429 | Optical OFDM transmission with improved efficiency A method of transmitting digital information over a dispersive optical channel includes encoding the digital information into a series of data blocks, wherein each block comprises a plurality of substantially orthogonal frequency domain subcarriers. Each data block ... | 04/06/2010 |
| 7653317 | Semiconductor laser device A first light feedback element is arranged at an optical distance L1 from a front facet of a semiconductor laser from which an output light is emitted on an optical path of the output light. An i-th light feedback element is arranged at an optical distance Li... | 01/26/2010 |
| 7548699 | Channel-length modulation (CLM) compensation method and apparatus A power supply generates a supply voltage that varies from a first voltage level to a second voltage level. A first current source is coupled to the power supply and generates a current that varies due to channel-length modulation. A channel-length modulation (CLM) ... | 06/16/2009 |
| 7460790 | Non-linear compensation of timing jitter Systems and methods for compensating transitions in a data stream to account for jitter including laser jitter. Transitions in the data stream are delayed or advanced depending on the laser jitter and/or whether the previous transition is a rising or falling transit... | 12/02/2008 |
| 7440702 | Method for transmitting digital image signal, digital image transmitting device, digital image sending device and digital image receiver A multiplexer of a transmission section generates a clock signal by multiplying a reference clock signal of a digital image signal by a predetermined number âKâ. A parallel digital image signal is converted into a serial digital signal on the basis of the clock ... | 10/21/2008 |
| 7433602 | Implementation of gradual impedance gradient transmission line for optimized matching in fiber optic transmitter laser drivers A transmitter in a fiber optic system is provided, including a driver circuit, a light emitting source, and transmission lines. The driver circuit is configured to receive a modulated electrical signal and to have a driver circuit output impedance. The light emittin... | 10/07/2008 |
| 7424228 | High dynamic range radio frequency to optical link A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 7421209 | Optical wavelength multiplexing FSK modulation method An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength multiplexing signal. A n optical frequency shift keying modulation unit a... | 09/02/2008 |
| 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 |
| 7412174 | Method and apparatus for distortion control for optical transmitters A method of manufacturing an optical transmitter includes assembling a laser device on a module including a temperature sensor and a temperature controller. An optimum operating temperature of the laser to minimize optical distortion is determined at a temperature w... | 08/12/2008 |
| 7406265 | Fiber optic communication signal link apparatus A fiber optic communication signal link apparatus for performing fiber optic link communication including a transmitter apparatus and a receiver apparatus coupled by a fiber optic cable. The transmitter is capable of detecting and modulating data that includes at le... | 07/29/2008 |
| 7400829 | Transmission apparatus and path selection method of a transmission apparatus A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a plurality of optical signal outputting sections that output the optical s... | 07/15/2008 |
| 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 |
| 7397018 | Amplitude and phase controlled adaptive optics system An adaptive optics system is provided. The system includes a light source, a pair of deformable mirrors and a detection module. The light source is configured to provide an outgoing beam. The outgoing beam has an amplitude and a phase. The first deformable mirror is... | 07/08/2008 |
| 7398022 | Optical return-to-zero phase-shift keying with improved transmitters An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical signal having improved spectral efficiency and performances and bein... | 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 |
| 7389049 | Chromatic dispersion compensation controlling system The dispersion monitoring device of the present invention detects a change in dispersion caused in a system by performing the decision process of a received signal using a data flip-flop in which required decision phase and decision threshold are set, averaging the ... | 06/17/2008 |
| 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 |
| 7376358 | Location specific optical monitoring An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and launching the spike signal into the a transmitter end of the optical l... | 05/20/2008 |
| 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 |
| 7369774 | Optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels Disclosed is an optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels in which center frequencies of optical channels are aligned. An optical frequency controlling device for ultra-dense wavelength-division-multiplexed... | 05/06/2008 |
| 7369771 | Optical network terminator and optical network connection method using it An optical network terminator of the present invention includes an optical wavelength division multiplexer for receiving an optical signal and incoherent light. An optical detection unit converts a downstream high speed and low speed optical signals into electrical ... | 05/06/2008 |
| 7369773 | Methods and systems for polarization control and polarization mode dispersion compensation for wideband optical signals An optical processing method includes: receiving an optical signal from an optical system, wherein the optical signal is distorted by frequency-dependent polarization effects in the optical system; spatially dispersing frequency components of the distorted optical s... | 05/06/2008 |
| 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 |
| 7366426 | Optical add/drop multiplexer using tunable filter and method for feedback controlling the tunable filter A wavelength stabilizing filter has a wavelength transmission characteristic curve that has its peak in a wavelength located between a first continuous set band and a second continuous set band longer in wavelength than the first set band, and that linearly drops fr... | 04/29/2008 |
| 7366428 | Optical receiver An optical receiver includes a light-receiving part and a control part. The light-receiving part includes an APD, a PIN-PD, and a branching optical device. First signal light is incident on the light-receiving part and is divided into second signal light and third s... | 04/29/2008 |
| 7366422 | Dispersion compensating device and optical transmission system A dispersion compensating device having a VIPA plate which is an optical component, a lens, and a mirror includes high reflectivity side monitor means for monitoring the light that is input into the VIPA plate and emitted from the first reflecting surface. By this, ... | 04/29/2008 |
| 7362980 | Duobinary transmission system and method An optical duobinary transmission system and method are provided for transmitting optical duobinary signals across an optical transmission link having residual dispersion. The system includes a transmitter having a low bandwidth modulator, adapted to provide filteri... | 04/22/2008 |
