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公开(公告)号：US20240333397A1
公开(公告)日：2024-10-03
申请号：US18193322
申请日：2023-03-30
申请人： CIENA CORPORATION
IPC分类号： H04B10/61
CPC分类号： H04B10/615 , H04B10/6163
摘要： Aspects of the subject disclosure may include, for example, obtaining a signal received at a coherent optical receiver, and equalizing the signal using a filter system, wherein the filter system includes a first filter that provides a first filtering characteristic, a second filter that provides a second filtering characteristic, and a third filter that provides a third filtering characteristic, wherein an adjustment rate of the first filter and an adjustment rate of the second filter are each at least ten times an adjustment rate of the third filter, and wherein the adjustment rate of the first filter is at least ten times the adjustment rate of the second filter. Other embodiments are disclosed.
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2.发明授权公开(公告)号：US10805064B1
公开(公告)日：2020-10-13
申请号：US16391527
申请日：2019-04-23
申请人： Ciena Corporation
发明人： Sadok Aouini , Naim Ben-Hamida , Ahmad Abdo , Timothy James Creasy , Lukas Jakober , Yalmez M. A. Yazaw , Shahab Oveis Gharan
IPC分类号： H04B10/50 , H04B10/69 , H04L7/033 , H04B10/071 , H04B10/40 , H04B10/25 , H04B10/079
摘要： A system includes an optical transmitter including a transmitter Phase Lock Loop (PLL) circuit; an optical receiver connected to the optical transmitter and including a receiver PLL circuit; and circuitry configured to inject a test stimulus to a clock causing jitter in one of the transmitter PLL circuitry and the receiver PLL circuit, wherein the test stimulus is set for characterizing the jitter tolerance of optical receiver. As well, a circuit that injects SOP transient at the transmitter is included. It is configured to test the tolerance of optical receiver to handle fast change in the SOP state. The optical receiver is configured to determine if the system is operational at a jitter value due to the test stimulus based on compliance to one or more thresholds including any of a target Bit Error Rate, a Forward-Error-Correction (FEC) hit, and a jitter Root Mean Square (RMS).
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公开(公告)号：US09647769B2
公开(公告)日：2017-05-09
申请号：US15078189
申请日：2016-03-23
申请人： Ciena Corporation
CPC分类号： H04B10/695 , H04B10/612 , H04B10/613 , H04B10/614 , H04B10/616 , H04B10/697 , H04L1/0054
摘要： In a coherent receiver of an optical communication system, a method of processing a detected symbol estimate to determine a most likely value of a corresponding transmitted data word, the transmitted data word comprising one or more data bits encoded in a transmitter using a predetermined constellation of at least two symbols. A set of two or more virtual constellation points are define in a decision region corresponding to a possible value of the data word. The detected symbol estimate is processed to find a most likely virtual constellation point given the detected symbol estimate. The most likely value of the corresponding transmitted data word is determined based on the most likely virtual constellation point.
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4.发明授权公开(公告)号：US11818242B2
公开(公告)日：2023-11-14
申请号：US17016616
申请日：2020-09-10
申请人： Ciena Corporation
发明人： Ahmad Abdo , Shahab Oveis Gharan , Sadok Aouini , Naim Ben-Hamida , Timothy James Creasy , Lukas Jakober , Yalmez M. A. Yazaw
IPC分类号： H04B10/532 , H04L7/033 , H04B10/071 , H04B10/40 , H04B10/25 , H04B10/079
CPC分类号： H04L7/0331 , H04B10/071 , H04B10/0795 , H04B10/25 , H04B10/40 , H04B10/532
摘要： An optical system includes a transmitter including transmitter circuitry configured to cause transmission of a transmitted optical signal over a fiber link on an X polarization and a Y polarization; and a receiver including receiver circuitry configured to receive a received optical signal from the fiber link on the X polarization and the Y polarization, wherein the transmitter circuitry is configured to cause State of Polarization (SOP) changes on the X polarization and the Y polarization for a test of the fiber link. The transmitter circuitry and the receiver circuitry are built-in with the transmitter and the receiver, respectively, for performance of the test.
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5.发明申请公开(公告)号：US20200344038A1
公开(公告)日：2020-10-29
申请号：US16391527
申请日：2019-04-23
申请人： Ciena Corporation
发明人： Sadok Aouini , Naim Ben-Hamida , Ahmad Abdo , Timothy James Creasy , Lukas Jakober , Yalmez M.A. Yazaw , Shahab Oveis Gharan
IPC分类号： H04L7/033 , H04B10/071 , H04B10/079 , H04B10/25 , H04B10/40
摘要： A system includes an optical transmitter including a transmitter Phase Lock Loop (PLL) circuit; an optical receiver connected to the optical transmitter and including a receiver PLL circuit; and circuitry configured to inject a test stimulus to a clock causing jitter in one of the transmitter PLL circuitry and the receiver PLL circuit, wherein the test stimulus is set for characterizing the jitter tolerance of optical receiver. As well, a circuit that injects SOP transient at the transmitter is included. It is configured to test the tolerance of optical receiver to handle fast change in the SOP state. The optical receiver is configured to determine if the system is operational at a jitter value due to the test stimulus based on compliance to one or more thresholds including any of a target Bit Error Rate, a Forward-Error-Correction (FEC) hit, and a jitter Root Mean Square (RMS).
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公开(公告)号：US10735135B2
公开(公告)日：2020-08-04
申请号：US16595709
申请日：2019-10-08
申请人： Ciena Corporation
IPC分类号： H04L1/00 , H04B10/516 , H04L1/20 , H04L27/34 , H04B10/50
摘要： A transmitter of a communications system includes a first encoder configured to apply a shaping operation to a data signal to generate a shaped data signal, a second encoder configured to encode the shaped data signal according to a forward error correction (FEC) scheme to generate an encoded signal, and a constellation mapper configured to modulate the encoded signal to symbol values according to a modulation scheme to generate a corresponding symbol stream for transmission through the communications system. The shaping operation reduces average constellation energy for constellations of the modulation scheme.
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公开(公告)号：US09698939B2
公开(公告)日：2017-07-04
申请号：US13917339
申请日：2013-06-13
申请人： Ciena Corporation
CPC分类号： H04L1/0042 , H04B10/5055 , H04B10/516 , H04L1/0003 , H04L1/206 , H04L27/3405
摘要： A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system.
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公开(公告)号：US11984911B2
公开(公告)日：2024-05-14
申请号：US17952533
申请日：2022-09-26
申请人： Ciena Corporation
CPC分类号： H03M13/1111 , H03M13/098 , H03M13/136 , H03M13/1515 , H03M13/152 , H03M13/6516
摘要： A transmitter generates an encoded vector by encoding a data vector, the encoded vector representing payload information and parity information. The encoding is mathematically equivalent to calculating three or more forward error correction (FEC) codewords from the data vector and then calculating the encoded vector from the codewords, at least one codeword being calculated from at least one recursion of a mathematical operation, and at least one codeword comprising more than 6 terms. The transmitter transmits a signal representing the encoded vector over a communication channel. A receiver determines a vector estimate from the signal and recovers the data vector from the vector estimate by sequentially decoding the codewords, wherein at least one codeword that is decoded earlier in the decoding enhances an estimate of at least one codeword that is decoded later in the decoding.
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公开(公告)号：US11652566B2
公开(公告)日：2023-05-16
申请号：US16603623
申请日：2018-07-30
申请人： Ciena Corporation
CPC分类号： H04L1/00 , G06F17/18 , H03M13/03 , H03M13/1125 , H03M13/253 , H03M13/29 , H03M13/2948 , H04L1/0041 , H04L1/0045 , H04L1/0063 , H04L1/0064 , H04L1/0066 , H04L1/203 , G06F17/156
摘要： In data communications, a suitably designed contrast coding scheme, comprising a process of contrast encoding (108) at a transmitter end (101) and a process of contrast decoding (120) at a receiver end (103), may be used to create contrast between the bit error rates ‘BERs’ experienced by different classes of bits. Contrast coding may be used to tune the BERs experienced by different subsets of bits, relative to each other, to better match a plurality of forward error correction ‘FEC’ schemes (104, 124) used for transmission of information bits (102), which may ultimately provide a communications system (100) having a higher noise tolerance, or greater data capacity, or smaller size, or lower heat.
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公开(公告)号：US11463105B2
公开(公告)日：2022-10-04
申请号：US17425396
申请日：2020-06-30
申请人： Ciena Corporation
摘要： A transmitter (200) generates (602) an encoded vector (404) by encoding (406) a data vector (402), the encoded vector representing payload information and parity information. The encoding is mathematically equivalent to calculating three or more forward error correction (FEC) codewords from the data vector and then calculating the encoded vector from the codewords, at least one codeword being calculated from at least one recursion of a mathematical operation, and at least one codeword comprising more than 6 terms. The transmitter transmits (604) a signal representing the encoded vector over a communication channel. A receiver (300) determines (702) a vector estimate (502) from the signal and recovers (716) the data vector from the vector estimate by sequentially decoding (706, 710, 714) the codewords, wherein at least one codeword that is decoded earlier in the decoding enhances an estimate of at least one codeword that is decoded later in the decoding.
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