公开(公告)号：US11611398B2

公开(公告)日：2023-03-21

申请号：US17487138

申请日：2021-09-28

Applicant: X DEVELOPMENT LLC

Inventor： Bruce Moision ,  Devin Brinkley ,  Baris Ibrahim Erkmen

IPC: H04B10/80 ,  H04B10/291 ,  H04B10/564

Abstract: An optical communication system includes an optical transmitter and one or more processors. The optical transmitter is configured to output an optical signal, and includes an average-power-limited optical amplifier, such as an erbium-doped fiber amplifier (EDFA). The one or more processors are configured to receive optical signal data related to a received power for a communication link from a remote communication system and determine that the optical signal data is likely to fall below a minimum received power within a time interval. In response to the determination, the one or more processors are configured to determine a duty cycle of the optical transmitter based on a minimum on-cycle length and a predicted EDFA output power and operate the optical transmitter using the determined duty cycle to transmit an on-cycle power that is no less than the minimum required receiver power for error-free operation of the communication link.

公开(公告)号：US10887011B2

公开(公告)日：2021-01-05

申请号：US16867814

申请日：2020-05-06

Applicant: X Development LLC

Inventor： Travis Lantz ,  Paul Csonka ,  Bruce Moision

IPC: H04B10/00 ,  H04B10/079 ,  H04B10/112

Abstract: The disclosure provides for a communication system that includes one or more sensors and one or more processors. The one or more processors are configured to receive, during a first timeframe, a first indication of an error rate of a communication link, a second indication of an amount of received power at a remote communication system, and one or more measurements related to the state of the communication system. The one or more processors are then configured to estimate a plurality of disturbance values to the communication system according to the one or more measurements and the second indication. Each disturbance value is associated with a set of components of the communication system. The one or more processors are configured to adjust a beam divergence of a beacon beam or a communication beam transmitted from the communication system based on the plurality of disturbance values and the first indication.

公开(公告)号：US10594448B2

公开(公告)日：2020-03-17

申请号：US16363020

申请日：2019-03-25

Applicant: X Development LLC

Inventor： Bruce Moision ,  Edward Keyes ,  Oliver Bowen ,  Devin Brinkley ,  Baris Erkmen

IPC: H04B10/00 ,  H04L1/18 ,  H04B10/112

Abstract: Aspects of the disclosure provide techniques for automatic repeat request (ARQ) in a free-space optical communication (FSOC) architecture. These techniques, including block-selective ARQ, adaptive retransmission delay, and random seed scrambling, can be used individually or in combination to combat problems involving frame loss or corruption. These techniques enable the system to rapidly recover by streamlining the retransmission process. For instance, block-selective ARQ acknowledges variable length blocks of frames in the return stream from the receiver to the transmitter. Adaptive retransmission delay allows the retransmission delay to grow in the absence of feedback by the receiver, up to some defined limit. And with random seed sampling, a scrambling sequence is incorporated to aid with frame syncing, which avoids the need for a line code. These aspects of the technology provide a robust communication process, and also reduce overhead costs associated with unnecessary retransmissions.

公开(公告)号：US10992320B2

公开(公告)日：2021-04-27

申请号：US16559985

申请日：2019-09-04

Applicant: X Development LLC

Inventor： Bruce Moision ,  Edward Keyes ,  Baris Erkmen ,  Oliver Bowen

IPC: H03M13/27 ,  H04L1/00

Abstract: The disclosure may provide for a communication method and system. A transmitter of the communication system may include an interleaver and a first encoder for determining parity bits. The transmitter also may include a multiplexer for joining the parity bits with the data. A second encoder may be positioned after the multiplexer for implementing an error correcting code. A receiver of the communication system may include a decoder followed by an interleaver. When errors are detected in received data at the decoder, one or more processors of the receiver may be configured to correct portions of the received data and combine the corrected portions with the received data.

公开(公告)号：US20190222365A1

公开(公告)日：2019-07-18

申请号：US16363020

申请日：2019-03-25

Applicant: X Development LLC

Inventor： Bruce Moision ,  Edward Keyes ,  Oliver Bowen ,  Devin Brinkley ,  Baris Erkmen

IPC: H04L1/18 ,  H04B10/112

Abstract: Aspects of the disclosure provide techniques for automatic repeat request (ARQ) in a free-space optical communication (FSOC) architecture. These techniques, including block-selective ARQ, adaptive retransmission delay, and random seed scrambling, can be used individually or in combination to combat problems involving frame loss or corruption. These techniques enable the system to rapidly recover by streamlining the retransmission process. For instance, block-selective ARQ acknowledges variable length blocks of frames in the return stream from the receiver to the transmitter. Adaptive retransmission delay allows the retransmission delay to grow in the absence of feedback by the receiver, up to some defined limit. And with random seed sampling, a scrambling sequence is incorporated to aid with frame syncing, which avoids the need for a line code. These aspects of the technology provide a robust communication process, and also reduce overhead costs associated with unnecessary retransmissions.

公开(公告)号：US10333617B2

公开(公告)日：2019-06-25

申请号：US15633252

申请日：2017-06-26

Applicant: X Development LLC

Inventor： Bruce Moision ,  Baris Erkmen ,  Devin Brinkley

IPC: H04B10/079 ,  H04B10/112 ,  H04B10/11 ,  H04B10/516 ,  H04L27/36 ,  H04L27/38 ,  H04B10/54

Abstract: A data rate at which data can be transmitted is adapted in real-time to power fluctuations. Bits of data to be sent by a transmitter are mapped to physical symbols, where a first modulation uses a first number of bits per pulse and a second modulation uses a second number of bits per pulse. Both modulations are sent, with one nested inside the other. A receiver decodes one or both bit streams, depending on a signal to noise ratio (SNR). In this regard, the data rate traces the received power, and higher data rates may be used despite periods of power fluctuations. This technique enables rapid, or even instantaneous, changes by using nested modulation. Moreover, a fast feedback mechanism is used to inform the transmitter when to change its modulation and to retransmit bits lost during an initial transmission.

公开(公告)号：US20180183516A1

公开(公告)日：2018-06-28

申请号：US15633252

申请日：2017-06-26

Applicant: X Development LLC

Inventor： Bruce Moision ,  Baris Erkmen ,  Devin Brinkley

IPC: H04B10/079 ,  H04B10/516 ,  H04L27/36 ,  H04L27/38 ,  H04B10/11

CPC classification number: H04B10/07955 ,  H04B10/11 ,  H04B10/5161 ,  H04B10/541 ,  H04L27/36 ,  H04L27/38

Abstract: A data rate at which data can be transmitted is adapted in real-time to power fluctuations. Bits of data to be sent by a transmitter are mapped to physical symbols, where a first modulation uses a first number of bits per pulse and a second modulation uses a second number of bits per pulse. Both modulations are sent, with one nested inside the other. A receiver decodes one or both bit streams, depending on a signal to noise ratio (SNR). In this regard, the data rate traces the received power, and higher data rates may be used despite periods of power fluctuations. This technique enables rapid, or even instantaneous, changes by using nested modulation. Moreover, a fast feedback mechanism is used to inform the transmitter when to change its modulation and to retransmit bits lost during an initial transmission.

公开(公告)号：US20240195500A1

公开(公告)日：2024-06-13

申请号：US18298532

申请日：2023-04-11

Applicant: X Development LLC

Inventor： Ondrej Cierny ,  Paul Epp ,  Jean-Laurent Plateau ,  Bruce Moision ,  Joaquin Matres Abril ,  Devin Brinkley

IPC: H04B10/11

CPC classification number: H04B10/11

Abstract: Aspects of the disclosure provide a method of adjusting a plurality of phase shifters of an OPA. The method may include identifying, by one or more processors, one or more first subsets of phase shifters of the plurality of phase shifters based on an orthogonal set of functions; performing, by the one or more processors, one or more first dithers on the one or more first subsets of phase shifters of the plurality of phase shifters using one or more first frequencies of a predetermined set of frequencies; determining, by the one or more processors, one or more first corrections based on a first power output of the OPA resulting from the one or more first dithers; and adjusting, by the one or more processors, the one or more first subsets using the one or more first corrections, the adjustment resulting in a first set of corrected phase shifter values.

公开(公告)号：US11271645B2

公开(公告)日：2022-03-08

申请号：US17108513

申请日：2020-12-01

Applicant: X Development LLC

Inventor： Travis Lantz ,  Paul Csonka ,  Bruce Moision

IPC: H04B10/00 ,  H04B10/079 ,  H04B10/112

Abstract: The disclosure provides for a communication system that includes one or more sensors and one or more processors. The one or more processors are configured to receive, during a first timeframe, a first indication of an error rate of a communication link, a second indication of an amount of received power at a remote communication system, and one or more measurements related to the state of the communication system. The one or more processors are then configured to estimate a plurality of disturbance values to the communication system according to the one or more measurements and the second indication. Each disturbance value is associated with a set of components of the communication system. The one or more processors are configured to adjust a beam divergence of a beacon beam or a communication beam transmitted from the communication system based on the plurality of disturbance values and the first indication.

公开(公告)号：US20190165815A1

公开(公告)日：2019-05-30

申请号：US15824111

申请日：2017-11-28

Applicant: X Development LLC

Inventor： Bruce Moision ,  Edward Keyes ,  Baris Erkmen ,  Oliver Bowen

IPC: H03M13/27 ,  H04L1/00

CPC classification number: H03M13/2792 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0058 ,  H04L1/0071

Abstract: The disclosure may provide for a communication method and system. A transmitter of the communication system may include an interleaver and a first encoder for determining parity bits. The transmitter also may include a multiplexer for joining the parity bits with the data. A second encoder may be positioned after the multiplexer for implementing an error correcting code. A receiver of the communication system may include a decoder followed by an interleaver. When errors are detected in received data at the decoder, one or more processors of the receiver may be configured to correct portions of the received data and combine the corrected portions with the received data.