公开(公告)号：US20220069974A1

公开(公告)日：2022-03-03

申请号：US17134145

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04L7/00

Abstract: Optical transmitters and receivers for improving synchronization of data transmitted over an optical network are described. The receiver can perform non-linear filtering as part of framer index estimation operations to improve the synchronization. The receiver can determine estimated positions of framer indices in data frames received from the transmitter. Next, using a non-linear filter, the receiver can remove estimated positions that are likely erroneous or are greater than a threshold away from the median or mode estimated framer index position. By removing the likely erroneous estimated positions, the receiver can then determine the estimated position of a framer index position for multiple frames with greater confidence.

公开(公告)号：US20190149389A1

公开(公告)日：2019-05-16

申请号：US16152349

申请日：2018-10-04

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Deyuan Chan ,  Han Henry Sun ,  Sandy Thomson ,  Kuang-Tsan Wu

IPC: H04L27/36 ,  H04L27/34 ,  H04L25/06 ,  H04L1/00

Abstract: Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

公开(公告)号：US20190149388A1

公开(公告)日：2019-05-16

申请号：US16152346

申请日：2018-10-04

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian

IPC: H04L27/36 ,  H04L25/06 ,  H04L27/34 ,  H04L1/00

Abstract: Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

公开(公告)号：US12231175B2

公开(公告)日：2025-02-18

申请号：US17529800

申请日：2021-11-18

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04L27/26 ,  H04B10/079 ,  H04B10/2575 ,  H04B10/516 ,  H04B10/61 ,  H04L1/1607 ,  H04L7/00 ,  H04L25/03 ,  H04L27/00 ,  H04L69/22

Abstract: Joint estimation of the framer index and the frequency offset in an optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. By identifying the beginning of the header portion of a data frame, the receiver can then process data received from the transmitter in a manner synchronous to the manner in which the data was transmitted by the transmitter.

公开(公告)号：US11757535B2

公开(公告)日：2023-09-12

申请号：US17134145

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04L7/00 ,  H04B10/61 ,  H04B10/516 ,  H04L69/22 ,  H04L25/03 ,  H04B10/079 ,  H04B10/2575 ,  H04L27/00 ,  H04L1/16 ,  H04L27/26 ,  H04L1/1607

CPC classification number: H04B10/6164 ,  H04B10/07951 ,  H04B10/25759 ,  H04B10/516 ,  H04B10/616 ,  H04L1/1657 ,  H04L7/0075 ,  H04L25/03305 ,  H04L25/03331 ,  H04L27/0014 ,  H04L27/2662 ,  H04L69/22 ,  H04B10/6161 ,  H04L2027/0026

Abstract: Optical transmitters and receivers for improving synchronization of data transmitted over an optical network are described. The receiver can perform non-linear filtering as part of framer index estimation operations to improve the synchronization. The receiver can determine estimated positions of framer indices in data frames received from the transmitter. Next, using a non-linear filter, the receiver can remove estimated positions that are likely erroneous or are greater than a threshold away from the median or mode estimated framer index position. By removing the likely erroneous estimated positions, the receiver can then determine the estimated position of a framer index position for multiple frames with greater confidence.

公开(公告)号：US20230125343A1

公开(公告)日：2023-04-27

申请号：US17973243

申请日：2022-10-25

Applicant: Infinera Corporation

Inventor： Francisco Javier Vaquero Caballero ,  Mehdi Torbatian ,  Demin Yao ,  Han Henry Sun ,  Jonathan Buset ,  Kuang-Tsan Wu

IPC: H04L25/03 ,  H04B10/61

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for performing asymmetric pulse-shaping filtering. In some implementations, a receiver comprises a detector circuit operable to receive optical signal data from an optical link. The receiver comprises a filter circuit, coupled to the detector circuit, operable to (i) filter the optical signal data according to an asymmetric filtering scheme and (ii) output the filtered optical signal data, wherein the asymmetric filtering scheme comprises utilizing a shaping filter with first criteria, the first criteria including one or more values greater than one or more values of second criteria utilized by a shaping filter at a transmitter, the transmitter communicating with the receiver.

公开(公告)号：US11606150B2

公开(公告)日：2023-03-14

申请号：US17134141

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04B10/61 ,  H04B10/516 ,  H04L7/00 ,  H04L69/22 ,  H04L25/03 ,  H04B10/079 ,  H04B10/2575 ,  H04L27/00 ,  H04L1/1607 ,  H04L27/26

Abstract: Joint estimation of the framer index and the frequency offset in an optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. By identifying the beginning of the header portion of a data frame, the receiver can synchronize, with less error, the data transmitted by the transmitter and the data it received. To further improve the framer index estimation, a lock indicator signal can be generated to signal to other receiver components that the estimated framer indices are reliable. The receiver can determine frequency offset and additional framer index estimations with increased reliability when performed after the lock indicator signal is generated.

公开(公告)号：US20220303166A1

公开(公告)日：2022-09-22

申请号：US17473537

申请日：2021-09-13

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Deyuan Chan ,  Han Henry Sun ,  Sandy Thomson ,  Kuang-Tsan Wu

IPC: H04L27/36 ,  H04L25/06 ,  H04L1/00 ,  H04L27/34 ,  H04L25/49 ,  H04B10/54 ,  H04B10/516 ,  H04B10/077 ,  H04J14/02

Abstract: Consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. Preferably, each symbol of the codeword is generated during a corresponding clock cycle, such that after n clock cycles, a complete codeword corresponding to the input bit sequence is output. On a receive end of the link, a decoder is provided that outputs the k-bit sequence every n clock cycles. Accordingly, buffers need not be provided at the output of the encoder and the input of the decoder, such that processing of the input sequence, codewords, and output sequence may be achieved efficiently without large buffers and complicated circuitry. Moreover, the input sequence, with any binary alphabet may be matched to a desired output distribution with any arbitrary alphabet. Accordingly, probabilistic constellation shaping may be achieved over constellations of arbitrary size. In addition, relatively long codewords, may be encoded and decoded with the apparatus and method disclosed herein. Accordingly, for a fixed SNR a higher SE (more bits per symbol) can be achieved. Alternatively, for a fixed SE, a lower SNR may be sufficient. Moreover, the resulting SE may be finely tailored to a particular optical link SNR to provide data transmission rates that are higher than the low order modulation formats that would otherwise be employed for optical signals carried by such links.

公开(公告)号：US20220094470A1

公开(公告)日：2022-03-24

申请号：US17479747

申请日：2021-09-20

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Alex Nicolescu ,  Han Henry Sun

IPC: H04L1/00 ,  H04W52/02

Abstract: Systems and methods for more efficiently decoding generalized product codes (GPC) are described. A receiving device equipped with a decoder is configured to receive GPC-encoded signals and implement an early termination method to avoid executing multiple operations of the decoding scheme typically used by the receiving device. The receiving device can identify whether a particular condition is satisfied when decoding a signal, and if the condition is satisfied, can omit certain operations of the decoding scheme and thereby reduce power consumption. The particular condition can be satisfied when the syndromes for sign bits in a codeword associated with the received signal are zero.

公开(公告)号：US20210399808A1

公开(公告)日：2021-12-23

申请号：US17134151

申请日：2020-12-24

Applicant: Infinera Corporation

Inventor： Mehdi Torbatian ,  Yuliang Gao ,  Ahmed Morra ,  Han Henry Sun ,  Yeongho Park

IPC: H04B10/61 ,  H04B10/516

Abstract: Joint estimation of the framer index and the frequency offset in a optical communication system are described among various other features. A transmitter can transmit data frames using pilot and framer symbols. A receiver can estimate the framer index and frequency offset using the pilot and framer symbols, and identify the beginning of a header portion of a data frame. The estimation can be performed to compensate for delays such as half-symbol delays and differential group delays. By identifying the beginning of the header portion of a data frame while compensating for certain delays, the receiver can synchronize, with less error, the data transmitted by the transmitter and the data it received.