Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 8180228 | Programmable phase detector for sequence equalizer for optical channels In a direct-detection receiver having an analog-to-digital converter (ADC) for sampling a received optical signal and a sequence estimator for recovering data symbols from a multi-bit sample stream generated by the ADC, a method of acquiring a channel lock condition... | 05/15/2012 |
| 8139958 | Frequency-domain equalization of the fiber optic channel Systems and methods for frequency-domain compensation in optical communication systems. In pre-equalization embodiments, the transmitter transforms the data stream into a frequency domain signal and applies a compensation filter before transforming it back into a pr... | 03/20/2012 |
| 8126338 | Method and apparatus for repeaterless high-speed optical transmission over single-mode fiber using coherent receiver and electronic dispersion compensation Repeaterless transmission of differential phase-shift keying (DPSK) at 10.7 Gb/s over at least 304 km of standard single-mode fiber is obtained through use of a coherent optical receiver including electronic dispersion compensation. High receiver sensitivity and hig... | 02/28/2012 |
| 8112004 | Optical receiver implemented with dual electronic dispersion compensators An optical receiver implemented with two electronic dispersion compensators (EDC) is disclosed. The optical receiver selects one of the EDC in an ordinary operation. Once there shaped signal compensated by the selected EDC is degraded due to irregular conditions of ... | 02/07/2012 |
| 8103176 | Frequency offset compensating apparatus and method, and optical coherent receiver The present invention relates to a frequency offset compensating apparatus and method, and an optical coherent receiver. The optical coherent receiver includes a front end processor and a frequency offset estimator, of which said front end processor converts an inpu... | 01/24/2012 |
| 8103177 | Apparatus and method for frequency offset monitoring used in digital coherent optical receiver The present invention discloses a frequency offset detecting apparatus and method for use in a digital coherent optical receiver. The digital coherent optical receiver comprises: a front-end processing section for generating a digital baseband electric signal; an eq... | 01/24/2012 |
| 8095019 | Digital clock and data recovery scheme A method and apparatus providing clock and data recovery within an optical receiver using three CMA FIR filters with different group delays where filter coefficients are adapted to provide for a filter exhibiting a group delay of one sample period from which symbols... | 01/10/2012 |
| 8095020 | Optical receiving device and optical transmission system According to an aspect of an embodiment, an apparatus includes: a wavelength-to-transmission quality characteristic obtaining unit for obtaining a wavelength-to-transmission quality characteristic; a residual dispersion-to-transmission quality characteristic saving ... | 01/10/2012 |
| 8086114 | Filter coefficient changing apparatus and method The present invention discloses filter coefficient changing apparatus and method for use in a dual-polarized optical coherent receiver. The apparatus comprises a controlling unit, a switching unit and a new coefficient obtaining unit. The switching unit is connected... | 12/27/2011 |
| 8078065 | Polarization tracking and signal equalization for optical receivers configured for on-off keying or pulse amplitude modulation signaling According to one embodiment, an optical receiver adapted to recover OOK or PAM data carried by a modulated optical carrier has an optical detector adapted to produce a sequence of vector pairs having first and second digital vectors indicative of complex values of f... | 12/13/2011 |
| 8064780 | Receiving device and receiving method A demodulating unit demodulates a differential M-phase shift keying signal light by causing delay and interference. A phase-error detecting unit detects an error of a control phase amount of the delay and the interference caused by the demodulating unit. A control u... | 11/22/2011 |
| 8059972 | Optical receiver and visible light communication system A data signal to be transmitted is supplied to a modulator of a transmitter, and the modulator modulates the output of a blue light-excited white LED and outputs blue LED light and phosphor light. The modulated blue light enters to a photo-electric converter through... | 11/15/2011 |
| 8041233 | Adaptive equalization in coherent fiber optic communication An embodiment of the invention is a technique to equalize received samples. A coefficient generator generates filter coefficients using a rotated error vector. A filter stage generates equalized samples or slicer input vector from received samples or rotated receive... | 10/18/2011 |
| 8023835 | Optical receiver, optical audio apparatus, optical communication apparatus and optical reception method An optical receiver with a threshold voltage convergence and audio apparatus and communication apparatus using the optical receiver are provided. The optical receiver of the present invention includes an optical detector for converting a received optical signal to a... | 09/20/2011 |
| 8005374 | Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulate... | 08/23/2011 |
| 7995929 | Optical receiver and an optical transmission system incorporating the same An optical data receiver comprises an optical input for receiving optical data signals, an optical sputter for splitting the optical signals into first and second receiver arms, an optical filter in the first receiver arm, means for increasing an intensity ratio of ... | 08/09/2011 |
| 7995930 | Optical receiver using Mach-Zehnder interferometer The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting ... | 08/09/2011 |
| 7991301 | Detecting abnormality in an optical receiver An optical apparatus comprising: a branching unit branching an input light modulated by DQSPK format and thereby outputting a first branched light and a second branched light; a first branch and a second branch inputting the first branched light and the second branc... | 08/02/2011 |
| 7978985 | Clipping correction system and method for correcting clipped signals in a receiver A system and method for restoring a clipped signal may be used in an optical receiver that detects a clipped modulated optical signal. The clipped modulated optical signal is detected to produce a clipped electrical signal including a series of clipped negative peak... | 07/12/2011 |
| 7970291 | Optical-receiving apparatus and bias-voltage-control method used for the optical-receiving apparatus According to an optical-receiving apparatus including an APD converting input light into an electric signal and a bias-voltage-control method used for the optical-receiving apparatus, a multiplication factor appropriate for the APD is predetermined and a multiplicat... | 06/28/2011 |
| 7962049 | Systems and methods for communication system control utilizing corrected forward error correction error location identifiers The present invention provides systems and methods for communication system control utilizing corrected forward error correction (FEC) error location identifiers in multi-level modulation scheme systems. The present invention utilizes precise error correction inform... | 06/14/2011 |
| 7949261 | Partial DPSK (PDPSK) transmission systems An optical receiver includes a demodulator having a delay interferometer comprising an optical input that receives a phase modulated optical signal from a bandwidth limited transmission system. The delay interferometer has a free spectral range that is larger than a... | 05/24/2011 |
| 7912382 | Optical-electrical transmitting device An optical-electrical transmitting device for transmitting a signal includes an electrical signal transmitting circuit which divides a transmission signal into a first transmission signal and a second transmission signal, a switching device which is electrically con... | 03/22/2011 |
| 7903984 | Optical receiver An optical receiver comprising: a photoelectric converting unit converting an input optical signal into an converted electrical signal; a splitting unit splitting the converted electrical signal into a plurality of split electrical signals; an amplifier amplifying o... | 03/08/2011 |
| 7894728 | Sample timing control in an optical receiver A method of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of sk... | 02/22/2011 |
| 7865087 | Bandpass filter circuit, band-elimination filter circuit, infrared signal processing circuit A bandpass filter circuit 10 of the present invention includes: transconductance amplifier circuits 1 to 3; a common-mode feedback circuit 4 which outputs a first control signal to the transconductance amplifier circuit 1 so that a... | 01/04/2011 |
| 7860407 | Pre-emphasis circuit An amplifier stage or circuit for providing pre-emphasis. The circuit includes a first input node configured to receive a first data signal and a second input node configured to receive a second data. The circuit also includes an adjustable delay stage configured to... | 12/28/2010 |
| 7848662 | Delay interferometer and demodulator A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A f... | 12/07/2010 |
| 7840144 | Coherent optical transceiver and coherent communication system and method for satellite communications An optical transceiver is provided for optical communications with additive noise compensation. The system and method are disclosed for the additive noise cancellation, which is typically a vibration noise, caused by moving platform, where the transceiver is located... | 11/23/2010 |
| 7792434 | Optical receiver An optical receiver of the present embodiment has a light-receiving block, a discriminating block, a detecting block, a controlling block, and an adjusting block. The light-receiving block generates complementary signals in accordance with a photo current output fro... | 09/07/2010 |
| 7764886 | Burst mode optical receiver A system, method, and computer readable medium for burst mode optical receiver that enables an optical receiver to receive signals from a plurality of optical network units at different optical power levels comprising, collecting Received Signal Strength Indication ... | 07/27/2010 |
| 7742706 | Dispersion compensation type optical signal receiving apparatus, receiving circuit, receiving method, and receiving program A dispersion compensation type optical signal receiving apparatus includes: an APD element for converting input signal light inputted from a transmission line into an electric signal; an amplifying device constituted with a preamplifier circuit and a limit amplifier... | 06/22/2010 |
| 7734194 | Optical transmission system, optical transmitter for optical transmission system, and optical receiver for optical transmission system An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulate... | 06/08/2010 |
| 7734195 | Method and arrangement for forming reception pulses in an infrared receiver In a method and arrangement for forming reception pulses, output signals of an upstream comparator which recognizes light pulses are used to evaluate a downstream arrangement and are newly formed and emitted as pulses. The aim is to produce a method and an associate... | 06/08/2010 |
| 7734196 | Optical receiver device A DQPSK receiver extracts first and second phase modulation components from an input optical signal, and respectively converts the extracted components into the first and second data signals. The DQPSK receiver extracts a clock signal from one of the data signals, a... | 06/08/2010 |
| 7720394 | Optical reception circuit and identification level controlling method for the same An optical reception circuit and an identification level controlling method for an optical reception circuit are disclosed wherein reception sensitivity degradation arising from transmission waveform degradation by chromatic dispersion can be suppressed. The optical... | 05/18/2010 |
| 7706697 | Optical signal regeneration device and corresponding method The invention relates in particular to an optical regeneration device for a signal carrying an item of information encoded by phase modulation of that signal, that signal being transmitted over an optical network and comprising a temporal succession of optical pulse... | 04/27/2010 |
| 7684713 | Phase control apparatus and optical DQPSK receiver A calculation processing unit controls temperature of a Peltier device based on a slope of a waveform obtained by subtracting a waveform of a B-arm monitoring signal from a waveform of an A-arm monitoring signal and a value obtained by subtracting a value B of the B... | 03/23/2010 |
| 7684712 | Non-linear equalizer in a coherent optical receiver A method of recovering a most likely value of each symbol transmitted through an optical communications network using a high speed optical signal. A stream of multi-bit digital samples of the optical signal is processed to generate a respective multi-bit estimate Xâ... | 03/23/2010 |
| 7636525 | Signal acquisition in a coherent optical receiver A method and system for initializing a coherent optical receiver. Upon detection of an optical signal, a multi-bit digital sample stream of the optical signal is digitally processed to initialize each one of a plurality of adaptive control blocks of the coherent opt... | 12/22/2009 |
