Leven
Andreas Leven, Bietigheim-Bissingen DE
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20130101300 | POWER ADJUSTMENT OF IN-PHASE AND QUADRATURE COMPONENTS AT A COHERENT OPTICAL RECEIVER - It is disclosed an optical coherent receiver for an optical communication network. The optical coherent receiver is configured to receive a modulated optical signal and to process it for generating an in-phase component and a quadrature component. The optical coherent receiver comprises a power adjuster in turn comprising a multiplying unit and a retroactively connected digital circuit. The multiplying unit is configured to multiply the in-phase and quadrature components by in-phase and quadrature gains, respectively, thereby providing power-adjusted in-phase and quadrature components. The digital circuit is configured to compute: a common gain indicative of a sum of the powers of the power-adjusted in-phase and quadrature components; a differential gain indicative of a difference between the powers of the power-adjusted in-phase and quadrature components; and the in-phase and quadrature gains as a product and a ratio, respectively, between the common gain and the differential gain. | 04-25-2013 |
20130287410 | PHASE SKEW COMPENSATION AT A COHERENT OPTICAL RECEIVER - It is disclosed a coherent optical receiver configured to receive a modulated optical signal and to generate an in-phase component and a quadrature component. The optical coherent receiver comprises a phase skew compensator in turn comprising a first digital circuit and a second digital circuit retroactively connected between an output and a control input of the first digital circuit. The first digital circuit provides a compensated in-phase component as a sum of the in-phase component multiplied by a first gain and the quadrature component multiplied by a second gain, and a compensated quadrature component as a sum of the in-phase component multiplied by a third gain and the quadrature component multiplied by a fourth gain. The second digital circuit computes the first, second, third and fourth gain as functions of an estimated cross-correlation between the compensated in-phase component and the compensated quadrature component. | 10-31-2013 |
20140016947 | METHOD OF DECODING OPTICAL DATA SIGNALS - Proposed is a method of deriving differentially decoded data values from a received differentially encoded phase modulated optical signal. The method uses an estimation algorithm in order to find derive a sequence of differentially decoded data values. The algorithm stipulates transition probabilities between hypothetical first states, representing differentially encoded data symbols assuming that no phase slip has occurred, and transition probabilities towards hypothetical second states, which represent differentially encoded data symbols assuming that a phase slip has occurred. The transition probabilities between the first and second states are weighted on the basis of a predetermined phase slip probability value. | 01-16-2014 |
20140086594 | OPTICAL RECEIVER HAVING A SIGNAL-EQUALIZATION CAPABILITY - In one embodiment, an optical receiver has a bulk dispersion compensator and a butterfly equalizer serially connected to one another to perform dispersion-compensation processing and electronic polarization de-multiplexing. The bulk dispersion compensator has a relatively large dispersion-compensation capacity, but is relatively slow and operates in a quasi-static configuration. The butterfly equalizer has a relatively small dispersion-compensation capacity, but can be dynamically reconfigured on a relatively fast time scale to track the changing conditions in the optical-transport link. The optical receiver has a feedback path that enables the configuration of the bulk dispersion compensator to be changed based on the configuration of the butterfly equalizer in a manner that advantageously enables the receiver to tolerate larger amounts of chromatic dispersion and/or polarization-mode dispersion than without the use of the feedback path. | 03-27-2014 |
20140195878 | METHOD OF DECODING A DIFFERENTIALLY ENCODED PHASE MODULATED OPTICAL DATA SIGNAL - Proposed is a method of decoding a differentially encoded PSK modulated optical data signal carrying FEC encoded data values. The optical signal is corrected by an estimated phase offset. From the corrected signal, respective likelihood values for the FEC encoded data values are derived, using an estimation algorithm which accounts for a differential encoding rule used for differentially encoding the optical signal. The derived likelihood values are limited to a predetermined range of values. From the limited likelihood values, FEC decoded data values are derived, using an algorithm which accounts for a FEC encoding rule used for FEC encoding the FEC encoded data values. | 07-10-2014 |
Andreas Leven, Heroldsberg GE
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20100254651 | OPTOELECTRONIC RECEIVER - An optoelectronic receiver and associated method of operation. | 10-07-2010 |
Andreas B. Leven, Heroldsberg DE
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20100247113 | PHASE ERROR CORRECTION IN A COHERENT RECEIVER - A method and apparatus for correcting of phase errors in a coherent optical receiver are disclosed. Embodiments include a method for calculating a phase error between in-phase and quadrature-phase component signals, multiplying the phase error by one of the component signals and subtracting the result from the other component signal to output a corrected signal. | 09-30-2010 |
20100329677 | Symbol Timing Recovery in Polarization Division Multiplexed Coherent Optical Transmission System - A method, apparatus and system for providing clock and data recovery in a receiver for receiving a high speed coherent polarization division multiplexed optical signal using a digital signal processing block including a spectral domain spatial combiner are provided. | 12-30-2010 |
Andreas Bertold Leven, Heroldsberg DE
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20100028011 | 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 for further processing are provided. | 02-04-2010 |
20100054761 | Monolithic coherent optical detectors - An optical receiver has a monolithically integrated electrical and optical circuit that includes a substrate with a planar surface. Along the planar surface, the monolithically integrated electrical and optical circuit has an optical hybrid, one or more variable optical attenuators, and photodetectors. The optical hybrid is connected to receive light beams, to interfere light of said received light beams with a plurality of relative phases and to output said interfered light via optical outputs thereof. Each of the one or more variable optical attenuators connects between a corresponding one of the optical outputs and a corresponding one of the photodetectors. | 03-04-2010 |
Arnaud Leven, Ergue Gaberic FR
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20110006017 | DUAL STAGE FILTRATION WITH BARRIER FOR FUEL WATER SEPARATION - A dual stage filter includes an outer filter with a first media and an inner filter with a second media. A barrier is between the first media and the second media. The barrier directs fluid flow between the first and second media. The barrier creates a flow path between the first and second media, such that a working fluid, which is desired to pass through the first and second media, is directed by the barrier and flows through the second media, and such that another fluid, which is not desired to pass through the second media, is directed by the barrier and separates from the working fluid. Using the barrier, the dual stage filter can employ either or both upward flow and downward flow to achieve efficient fluid separation, for example fuel water separation in an engine fuel filter. | 01-13-2011 |
Arnuad Leven, Ergue Gaberic FR
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20090078631 | Modular fuel filter assembly - A fuel heater module and a water-in-fuel sensor module are disclosed that are configured to be connected to an outside surface of a filter assembly. The fuel heater module includes an inlet port and an outlet port with a heating element positioned in the fluid path between the inlet and outlet. A thermostat is included for controlling operation of the heating element. The water-in-fuel sensor module is configured to detect water in the filter housing that it may be drained from the filter housing. Both modules are configured to be attached to an outside surface of the filter housing thereby being readily replaceable. | 03-26-2009 |
Lesley Leven, Narrabi AU
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20120219392 | METHOD AND ASSEMBLY FOR PROCESSING ROUND SEED COTTON MODULES - An assembly for enabling the release of produce from a module retained by a plastics sleeve. The apparatus comprises a primary support frame including legs fixed to ground surface via feet. A gantry supports a compression assembly capable of receiving and retaining a module. There are means to enable the compression assembly to move between a non working state in which the compression assembly is elevated above a work station and a working state in which the compression assembly is at a work station in which compression arms are capable of retaining a produce module. The compression assembly includes means to enable the arms to apply a radial force to the module sufficient to allow the compression assembly to remove the plastics sleeve and allow the produce to gravitate through a free end of the module as the plastics sleeve is elevated away from the produce. | 08-30-2012 |