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公开(公告)号：US12040834B2
公开(公告)日：2024-07-16
申请号：US17596617
申请日：2020-06-10
IPC分类号： H04B10/2569 , H04B3/06 , H04B10/61
CPC分类号： H04B10/2569 , H04B3/06 , H04B10/61
摘要： An adaptive equalizer (70) according to this invention includes an adaptive equalization filter (71) configured to adaptively compensate for a waveform distortion caused by a polarization fluctuation of a received signal (61) by updating a tap coefficient, a first tap coefficient updater (72) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a variable step size and update the tap coefficient of the adaptive equalization filter (71), a second tap coefficient updater (73) configured to calculate the tap coefficient according to the polarization fluctuation of the received signal (61) using a fixed step size μ0, a polarization state estimator (74) configured to estimate a polarization state of the received signal (61) using the tap coefficient calculated by the second tap coefficient updater (73), and a step size updater (75) configured to obtain the step size corresponding to the polarization state estimated by the polarization state estimator (74) and update the variable step size. According to this invention, it is possible to provide an adaptive equalizer that always implements stable followability to various SOP fluctuations.
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公开(公告)号：US12028109B2
公开(公告)日：2024-07-02
申请号：US17920832
申请日：2021-05-19
IPC分类号： H04B10/61 , H04B3/06 , H04B10/2569
CPC分类号： H04B10/2569 , H04B3/06 , H04B10/6162
摘要： A tap-coefficient control circuit sets the tap coefficient converged by the second tap coefficient updater as an initial value of the tap coefficient in the first digital filter which is to be updated by the first tap coefficient updater, arranges the tap coefficients converged by the second tap coefficient updater in descending order of contribution degree to the convergence operation of tap coefficient update in the first tap coefficient updater, judges the tap coefficient not less than upper specified number to be valid and the tap coefficient less than the specified number to be invalid, and sets the tap coefficient of the first digital filter corresponding to the tap coefficient judged to be invalid to zero not to be used in a calculation of the first tap coefficient updater until a next judgment result is made.
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公开(公告)号：US12007631B2
公开(公告)日：2024-06-11
申请号：US18359678
申请日：2023-07-26
申请人： VIAVI SOLUTIONS INC.
IPC分类号： G02F1/01 , G02B3/00 , G02B6/27 , H04B10/2569 , H04B10/532 , H04J14/06
CPC分类号： G02F1/0136 , G02B3/0087 , G02B6/2786 , H04B10/2569 , H04B10/532 , H04J14/06 , G02F1/0139
摘要： A polarization scrambler using a retardance element (RE) is disclosed. The polarization scrambler may include an optical fiber input to transmit an optical signal, and a beam expander to receive and expand the optical signal to create an expanded optical signal. The polarization scrambler may include a retardance element (RE) to cause a polarization scrambling effect on the expanded optical signal and to create a scrambled expanded optical signal. The polarization scrambler may include a beam reducer to receive and reduce the scrambled expanded optical signal to create a scrambled optical signal. The polarization scrambler may include an optical fiber output to receive scrambled optical signal. The optical fiber output may transmit the scrambled optical signal to one or more downstream optical components.
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公开(公告)号：US20220385365A1
公开(公告)日：2022-12-01
申请号：US17329335
申请日：2021-05-25
申请人： Ciena Corporation
发明人： Sadok Aouini , Robert G. Gibbins , Yalmez Yazaw , Harvey Mah , Naim Ben-Hamida
IPC分类号： H04B10/2513 , H04B10/2569
摘要： An optical Digital Signal Processor (DSP) circuit includes a digital core configured to implement digital signal processing functionality and configured to operate at a plurality of baud rates including a full baud rate and a half-baud rate; and an analog interface including a Digital-to-Analog Converter (DAC) section and an Analog-to-Digital Converter (ADC) section, wherein the analog interface is connected to the digital core and is configured to operate at the full baud rate when the digital core is configured to operate at any of the plurality of baud rates.
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公开(公告)号：US11502758B2
公开(公告)日：2022-11-15
申请号：US17179600
申请日：2021-02-19
IPC分类号： H04B10/69 , H04B10/61 , H04B10/508 , H04B10/2569 , H04B10/079
摘要： A communications system may include a transmitter node, a receiver node, and an optical communications channel coupling the transmitter node and receiver node. The transmitter node may include a pulse transmitter and a pulse divider downstream therefrom. The receiver node may include a pulse recombiner and a pulse receiver downstream therefrom.
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公开(公告)号：US11456805B2
公开(公告)日：2022-09-27
申请号：US17438143
申请日：2019-05-08
发明人： Don Becker , Dmitrios Kalavrouziotis , Paraskevas Bakopoulos , Vladimr Iakolev , Elad Mentovich
摘要： A passive dual polarization unit and coherent transceiver and/or receiver including one or more passive dual polarization units are provided. An example passive dual polarization unit includes a polarization splitter configured to split an input signal into a TE mode and TM mode signals; TE/TM splitters each designed to split the TE/TM mode signals into first TE/TM signals and second TE/TM signals; a first TE signal polarization rotation component for receiving the first TE signal and providing a third TM signal having the same magnitude and time dependence as the first TE signal; a first TM signal polarization rotation component for receiving the first TM signal and providing a third TE signal having the same magnitude and time dependence as the first TM signal; and TE/TM couplers that couple the second TE/TM signals and the third TE/TM signals to generate output TE/TM signals.
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公开(公告)号：US11206085B2
公开(公告)日：2021-12-21
申请号：US16078126
申请日：2017-01-03
IPC分类号： H04B10/2513 , H04B10/2525 , H04B10/2569
摘要： A device (10;150;200) is configured to receive an optical signal. The device comprises a dispersion compensator (210a) comprising a plurality of optical dispersion compensator units (220). Each optical dispersion compensator unit comprises a plurality of delay elements (20;40). The dispersion compensator (210a) is configured to selectively activate one or more of the optical dispersion compensator units (220). The dispersion compensator (210a) is configured to compensate for dispersion of the optical signal with the activated one or more optical dispersion compensator unit (200).
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公开(公告)号：US20210320742A1
公开(公告)日：2021-10-14
申请号：US17357468
申请日：2021-06-24
发明人： Wei Jia , Liangjia Zong , Bing Zou , Lei Mao , Chao Pan
IPC分类号： H04J14/02 , H04B10/61 , H04B10/2569 , H04B10/079
摘要： A polarization-dependent loss (PDL) determining method includes obtaining two groups of optical powers within first duration, selecting at least one group of target optical powers that satisfy a same power constraint from the two groups of optical powers, where each group of target optical powers includes a first target power and a second target power from the two groups of optical powers, and determining a PDL of the optical device based on the at least one group of target optical powers.
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公开(公告)号：US20200350990A1
公开(公告)日：2020-11-05
申请号：US16399906
申请日：2019-04-30
IPC分类号： H04B10/00 , H04B10/2569 , H04B10/079 , H04B10/40 , H04B10/61 , H04B10/70 , H04B10/2513
摘要： Communication of light signals and optical cables can be managed to mitigate error associated with using optical cables to communicate light signals. A communication management component (CMC) can embed respective timing synchronization pulses in respective lights signals having respective wavelengths. The light signals can be typical light signals or can be squeezed and twisted to generate a desired twisted light signal. The light signals can be transmitted via the optical cable to a receiver. A CMC, at the receiver end, can determine error associated with the transmission of the light signals via the optical cable and respective characteristics of the respective light signals, including respective arrival times of the respective timing synchronization pulses and respective light intensity or power levels of the respective light signals. From the respective characteristics, CMC can determine a compensation action to perform mitigate the error with regard to subsequent transmissions of light signals.
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公开(公告)号：US10560199B2
公开(公告)日：2020-02-11
申请号：US16255963
申请日：2019-01-24
申请人： FUJITSU LIMITED
发明人： Yuya Imoto , Kazuhiko Hatae , Nobukazu Koizumi , Yasuo Ohtomo , Masato Oota , Masashi Sato , Daisuke Sasaki
摘要： A signal processing circuit includes: a processor configured to adjust phases of reception samples which is supplied at a supply interval, according to a phase adjustment amount; and a processing circuit including a finite impulse response (FIR) filter with taps and configured to process, by the FIR filter, each of the reception samples and output output symbols at an output interval different from the supply interval, the processor is configured to: derive initial values of tap coefficients for the respective taps; and derive the phase adjustment amount such that a center of centroids of the tap coefficients at respective output time points of the output symbols coincides with a center of a number of taps of the FIR filter, the tap coefficients at respective output time points of the output symbols being set according to a deviation between the supply interval and the output interval and the initial values.
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