公开(公告)号：US10720995B1

公开(公告)日：2020-07-21

申请号：US16547389

申请日：2019-08-21

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Christopher R. S. Fludger ,  Alberto Cervasio ,  Matthew J. Traverso

IPC: H04B10/2507 ,  H04B10/524 ,  H04L25/49 ,  H04J14/02 ,  H04B1/04 ,  H04B10/2513 ,  H04B10/516 ,  H04B10/54 ,  H04B10/079

Abstract: The present disclosure provides signal management with unequal eye spacing by: sending, from a local transmitter, first and second signals with different first and second known eye patterns to a remote receiver over a channel; sending temperature data of the local transmitter and operating wavelength data of the first and second signals to the remote receiver over the channel; receiving, from the remote receiver, tuning parameters based on a dispersion of the channel based on a first difference between the first known eye pattern as transmitted and as received and a second difference between the second known eye pattern as transmitted and as received; and adjusting transmission rail values used to encode data for transmission over the channel by the local transmitter based on the tuning parameters to produce a conditioned signal for transmission with an unequally spaced eye pattern.

公开(公告)号：US10135645B1

公开(公告)日：2018-11-20

申请号：US15787239

申请日：2017-10-18

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Alberto Cervasio

IPC: H04B10/00 ,  H04L25/03 ,  H04B10/079 ,  H04B10/40 ,  H04L1/00 ,  H04L1/20 ,  H04B10/54 ,  H04B10/69

Abstract: A method is disclosed for configuring equalization circuitry of a communication device. The method comprises determining, for a predefined first value of a tap weight of a decision feedback equalizer (DFE) of the equalization circuitry, whether a predefined error propagation condition occurs. The method further comprises iteratively updating the tap weight according to a predefined scheme, wherein each update of the tap weight occurs responsive to determining that the predefined error propagation condition occurs for a current value of the tap weight. The method further comprises ceasing the updating of the tap weight responsive to determining a difference between two adjacent values of the tap weight is less than a predefined resolution limit.

公开(公告)号：US11296791B1

公开(公告)日：2022-04-05

申请号：US17062289

申请日：2020-10-02

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Alberto Cervasio

IPC: H04B10/40 ,  G02B6/293

Abstract: Techniques for tuning an optical communication system are disclosed. The system includes a first signal path for transmitting data, including an optical source, a first one or more variable optical attenuators (VOAs), a modulator, and a transmission fiber. The system further includes a second signal path for receiving data, including a receiver fiber and a second one more VOAs. The first one or more VOAs are tuned using the optical source in the first signal path for transmitting data, based on comparing a plurality of optical signal power values in the first path while a first tuning mode is enabled. The second one or more VOAs are tuned, using the optical source in the first signal path for transmitting data, based on comparing a plurality of optical signal power values in the second path while a second tuning mode is enabled.

公开(公告)号：US10439726B1

公开(公告)日：2019-10-08

申请号：US16177737

申请日：2018-11-01

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Alberto Cervasio ,  Tao Ling

IPC: H04B10/572 ,  H04B10/40 ,  H04B10/25 ,  G02B6/42 ,  H04B10/079

Abstract: A local node of an optical network obtains local operating parameters associated with a bi-directional link to a remote node of the optical network, including a nominal local wavelength and a local temperature. The local node also obtains remote operating parameters of the remote node, including a nominal remote wavelength and a remote temperature. The local node further determines a target local wavelength based on a comparison of the local operating parameters and the remote operating parameters, and tunes a local transmitter to generate light at the target local wavelength. The local node also tunes a local filter to transmit light at the target local wavelength and reflect light at a target remote wavelength. This may be done by exchanging a configuration identifier with the remote node. The configuration identifier from the remote node is encoded in pulses of light from a remote transmitter in the remote node.

公开(公告)号：US11374655B1

公开(公告)日：2022-06-28

申请号：US17303934

申请日：2021-06-10

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Alberto Cervasio ,  Jock T. Bovington

IPC: H04B10/40 ,  H01S5/50 ,  H04B10/2513 ,  H04B10/50 ,  H04B10/079 ,  H04B10/43 ,  H04B10/60 ,  H04B10/61 ,  H04B10/2507 ,  H04B10/25

Abstract: A link extender configured to extend a range of an optical transceiver module is provided. The link extender includes an array of semiconductor optical amplifiers (SOAs) configured to amplify an optical signal received from the optical transceiver module, a first plurality of variable optical attenuators (VOAs) configured to control a power output of the amplified optical signal output from the array of SOAs, and a plurality of dispersion compensation and filtering (DC&F) devices configured to compensate for chromatic dispersion of the optical signal.

公开(公告)号：US11249266B2

公开(公告)日：2022-02-15

申请号：US16691342

申请日：2019-11-21

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Alberto Cervasio

IPC: H04B10/00 ,  G02B6/42 ,  G02B6/44 ,  H04B10/80 ,  H04B10/40 ,  H04B10/25

Abstract: Embodiments herein describe an intelligent optical cable that includes an optical assembly disposed between two pluggable connectors. In one embodiment, the optical assembly in the intelligent optical cable are coupled to the pluggable connectors via respective ribbons, where first ends of the ribbons are connected to the optical assembly while second ends of the ribbons are connected to respective pluggable connectors. In one embodiment, the optical assembly includes a photonic chip which performs an optical function on the optical signals propagating in the optical cable.

公开(公告)号：US11101890B2

公开(公告)日：2021-08-24

申请号：US16933837

申请日：2020-07-20

Applicant: Cisco Technology, Inc.

Inventor： Marco Mazzini ,  Christopher R. S. Fludger ,  Alberto Cervasio ,  Matthew J. Traverso

IPC: H04B10/2507 ,  H04B10/524 ,  H04L25/49 ,  H04J14/02 ,  H04B1/04 ,  H04B10/2513 ,  H04B10/516 ,  H04B10/54 ,  H04B10/079

Abstract: The present disclosure provides signal management with unequal eye spacing by: determining a dispersion slope of a channel between a transmitter and a receiver based on a temperature of the transmitter and a wavelength used by the transmitter to transmit signals over the channel; determining maximum and minimum powers for transmission over the channel; assigning a plurality of rails to a corresponding plurality of power levels, wherein amplitude differences between adjacent rails of the plurality of rails are based on the dispersion slope and produce a first eye pattern with a first Ratio of Level Mismatch (RLM) less than one; encoding, by the transmitter, data onto a conditioned signal according to the plurality of rails; and transmitting the conditioned signal over the channel, so that the conditioned signal demonstrates a second eye pattern with a second RLM greater than the first RLM when received at the receiver.