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| Number | Title | Issue Date |
| 8165474 | Reducing cross modulation in multichannel modulated optical systems with anti-clipping A modulated optical system with anti-clipping reduces or corrects clipping that might occur in the laser as a result of negative spikes or peaks in a multichannel RF signal. The system generally detects an envelope of the RF signal to generate an anti-clipping signa... | 04/24/2012 |
| 8150271 | Active tuning of temporal dispersion in an ultrashort pulse laser system A chirped pulse amplification (CPA) system and method is described wherein the dispersion of the system is tuned by actively tuning one or more system components, for example, using a temperature or strain gradient, or using actinic radiation. In other embodiments, ... | 04/03/2012 |
| 8145066 | Predistortion using FPGA Predistortion logic for an optical communications laser or optical modulator, includes predistortion logic embodied in a field programmable gate array (FPGA). A first analog to digital converter (ADC) provides a representation of an RF signal at an input of the FPGA... | 03/27/2012 |
| 8139954 | System and method for reducing memory requirements for electrical domain compensation of intra-channel nonlinearity in an optical communications system A digital filter is provided for processing an electrical input signal to be conveyed through an optical communications system. The processing generates a predistorted electrical signal using a compensation function that substantially mitigates for intra-channel non... | 03/20/2012 |
| 8107826 | Methods and apparatus for optical transmission of digital signals A method of communicating digital information over a dispersive optical channel includes encoding the digital information into a plurality of data blocks, each of which includes a number of bits of the information. A time-varying electrical signal is generated which... | 01/31/2012 |
| 8073340 | Distortion compensation circuit including one or more phase invertible distortion paths A distortion compensation circuit compensates for distortion generated by one or more non-linear elements such as a laser device and may include a primary signal path for carrying an input signal and one or more secondary signal paths for generating distortion. The ... | 12/06/2011 |
| 8068745 | RF signal power regulation in optical transmitters A circuit controlling the gain of an amplifier in an optical transmitter used for optical communication, including a detection circuit for measuring the power of the RF input to a laser; a gain controller or controlling a gain of an amplifier, and a switch connected... | 11/29/2011 |
| 8064777 | Four quadrant linearizer A system includes a laser generator, and a signal distortion generator circuit inline with the laser generator modulation signal and configured to generate distortion vectors in any of four distortion vector quadrants. ... | 11/22/2011 |
| 8045863 | Byte-interleaving systems and methods for 100G optical transport enabling multi-level optical transmission The present invention provides byte-interleaving systems and methods for Optical Transport Unit N (OTUN) (i.e. Optical Transport Unit 4 (OTU4)) and 100 Gb/s (100 G) optical transport enabling multi-level optical transmission. The byte-interleaving systems and method... | 10/25/2011 |
| 8027593 | Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers The frequency chirp modulation response of a directly modulated laser is described using a small signal model that depends on slow chirp amplitude s and slow chirp time constant τs. The small signal model can be used to derive an inverse response for des... | 09/27/2011 |
| 7983571 | Apparatus and method for very high data rate optical transmission, and the use of said apparatus and said method The apparatus includes a pulse emitter and at least one line fiber for conveying at least one pulse in the line fiber. A spreader module for linearly spreading pulses is provided including a propagation medium that is dispersive and linear. The propagation medium pr... | 07/19/2011 |
| 7962045 | Optical transmitter having a widely tunable directly modulated laser and periodic optical spectrum reshaping element An optical transmitter is disclosed including a widely tunable laser coupled to a periodic optical spectrum reshaper (OSR) to convert frequency modulated pulses from the laser into amplitude modulated pulses. The laser is tuned to generate pulses corresponding to pa... | 06/14/2011 |
| 7962046 | Automated dispersion compensation over a broad wavelength range for coherent optical pulses The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical a... | 06/14/2011 |
| 7945172 | Dispersion compensation circuitry and system for analog video transmission with direct modulated laser An improved precompensation circuit includes a greatly improved differentiator in the dispersion precompensation path, a preprocessor in the dispersion precompensation path for reducing f2−f1 type Composite Second Order (CSO) distortion, and a broadband phase shif... | 05/17/2011 |
| 7941057 | Integral phase rule for reducing dispersion errors in an adiabatically chirped amplitude modulated signal An optical transmitter is disclosed for transmitting a signal along a dispersive medium to a receiver. The optical transmitter generates adiabatically chirped profile having an initial pulse width and frequency excursion chosen such that high frequency data sequence... | 05/10/2011 |
| 7936997 | Method and apparatus for low chirp transmitter for optical fiber communications A directly modulated optical transmitter for use with a fiber optical communications system operating in the 1550 nm wavelength band exhibits very low chirp. The chirp inherently present in a directly modulated laser is cancelled by a phase modulator which optically... | 05/03/2011 |
| 7925170 | Predistortion circuit including distortion generator diodes with adjustable diode bias A predistortion circuit provides a predistorted input signal that compensates for distortion generated by a non-linear amplifier such as a laser device. The predistortion circuit may be used in an optical transmitter designed for broadband applications, such as a la... | 04/12/2011 |
| 7903980 | Amplified wavelength broadband video distribution architectures using a phase modulating waveguide Provided herein are embodiments of a device, method of use and system for a low-cost analog multi-wavelength video distribution transamplifier for CATV and FTTH networks having a broadband overlay. The transamplifier embodiments described herein allow the use of mul... | 03/08/2011 |
| 7840140 | Method and arrangement for forming a transmitter-side transmission signal A transmitter-side transmission signal for compensating disturbances caused by e transmission properties of an optical transmission system is provided. A high-bit-rate-binary signal is serially introduced into an N-level-shift register. A bit pattern whose bit numbe... | 11/23/2010 |
| 7822347 | Active tuning of temporal dispersion in an ultrashort pulse laser system A chirped pulse amplification (CPA) system and method is described wherein the dispersion of the system is tuned by actively tuning one or more system components, for example, using a temperature or strain gradient, or using actinic radiation. In other embodiments, ... | 10/26/2010 |
| 7813653 | Method and apparatus for reducing clipping in an optical transmitter by phase decorrelation A method and apparatus is provided for reducing clipping arising in an optical transmitter. The method begins by generating a frequency multiplexed sub-carrier signal onto which information is modulated at a plurality of different sub-carrier frequencies. The method... | 10/12/2010 |
| 7809282 | Dispersion compensating circuits for optical transmission system Improved dispersion compensating circuits for optical transmission systems are disclosed. According to the improved method, there is provided a compensation circuit comprising a varactor diode network. The network is preferably inserted between a source of laser mod... | 10/05/2010 |
| 7801450 | Optical transmitter and optical communication system An optical transmitter includes an optical modulator, an optical coupler, a crosspoint monitoring unit, a reference-value setting unit, and a bias circuit. The optical coupler splits an optical signal output from the optical modulator into a plurality of optical sig... | 09/21/2010 |
| 7796898 | Methods and apparatus for generation and transmission of optical signals Methods and apparatus (100) for composing, generating and transmitting information-bearing optical signals are provided. An information-bearing electrical signal is composed (108) having desirable spectral properties, preferably configured to ensure th... | 09/14/2010 |
| 7680421 | Multimode optical fibre communication system A multimode optical fibre communications system, and in particular to a system in which non-linearities in the propagation of the signal through a multimode optical communications channel degrade the signal presented to the receiver. The system includes an optical t... | 03/16/2010 |
| 7672599 | Intra-channel nonlinearity compensation for optical data communications An arrangement is described for compensating intra-channel nonlinearities in an optical communications system which combines optical dispersion compensation with electronic pre-distortion (EPD). EPD with moderate lookup table size can effectively suppress intra-chan... | 03/02/2010 |
| 7660537 | Simultaneous electrical pre-compensation of self-phase modulation and chromatic dispersion The present invention includes a fast algorithm to compute the pre-equalized waveform for simultaneous compensation of the self-phase modulation and chromatic dispersion experienced by a high-speed optical signal, e.g., at 10 Gb/s, and shows that it is used for an a... | 02/09/2010 |
| 7606502 | Second order predistortion circuit A predistortion generator for coupling in-line with a non-linear device produces an output predistortion signal of useful amplitude, but with low composite triple beat and cross modulation distortions. The predistortion circuit comprises a distortion circuit which u... | 10/20/2009 |
| 7561809 | Modulated laser with integral pre-distortion circuit An integrated laser device includes a pre-distortion circuit. The pre-distortion circuit receives an electrical modulation signal and generates a pre-distorted modulation signal. A laser is integral with the pre-distortion circuit. The laser includes an electrical m... | 07/14/2009 |
| 7542685 | System and method for automatic chromatic dispersion compensation An apparatus and method for transmitting a signal for optical network applications with automatic chromatic dispersion compensation. The apparatus includes a first optical transmitter. The first optical transmitter includes a first light source configured to generat... | 06/02/2009 |
| 7505694 | Thermal chirp compensation systems for a chirp managed directly modulated laser (CML™) data link A fiber optic communication system for receiving an electronic digital data signal and transmitting the same, comprising an optical signal source adapted to receive the digital data signal and to produce a frequency modulated optical signal from a directly modulated... | 03/17/2009 |
| 7477850 | Optical signal jitter reduction via electrical equalization in optical transmission systems An optical transmission system comprises an electrical source and an electrical-to-optical converter. The electrical source is adapted to provide an electrical signal at an output thereof. The electrical-to-optical converter has an input coupled to the output of the... | 01/13/2009 |
| 7466927 | Electro-absorption modulation of optical signals A signal having positive and negative going transitions drives an electro-absorption modulator. The signal is shaped into a waveform having an average value and first wave segments, each derived in response to a positive going transition. Each first wave segment is ... | 12/16/2008 |
| 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 ‘K’. A parallel digital image signal is converted into a serial digital signal on the basis of the clock ... | 10/21/2008 |
| 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 |
| 7426350 | Hybrid optical and electrical fiber optic link linearizer Techniques and systems for reducing nonlinear distortions in an output optical beam from an optical transmitter by using both electrical pre-distortion compensation and optical compensation. ... | 09/16/2008 |
| 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 |
| 7409163 | Method and apparatus for optical signal transmission A method and apparatus for transmission of optical signals across an optical transmission link wherein duobinary signals or inverse-data signals are transmitted when the chromatic dispersion of the transmission link is above or below a dispersion threshold, respecti... | 08/05/2008 |
