公开(公告)号：WO2020150135A1

公开(公告)日：2020-07-23

申请号：PCT/US2020/013314

申请日：2020-01-13

Applicant: X DEVELOPMENT LLC

Inventor： BRINKLEY, Devin ,  MOISION, Bruce ,  CSONKA, Paul ,  ERKMEN, Baris Ibrahim

IPC: H04B10/112 ,  H04B10/118

Abstract: The disclosure provides a communication system (102) that includes sensors (118), a plurality of components (112, 114, 116), and processors (104). The sensors (118) receive measurements related to a state of the communication system (102). The processors (104) receive an indication of an amount of received power at a remote communication system (122) and estimate a state of the plurality of components (112, 114, 116) based on the received one or more measurements and the received indication. Using the indication and the estimated state, the processors (104) determine whether the amount of received power is likely to fall below a minimum received power within a given time interval. When it is likely, the processors (104) select an adjustment technique of a plurality of adjustment techniques for adjusting a data rate of the outbound signal and adjust a given component of the communication system (102) using the selected adjustment technique to change the data rate of the outbound signal.

公开(公告)号：WO2018125751A3

公开(公告)日：2018-07-05

申请号：PCT/US2017/067919

申请日：2017-12-21

Applicant: X DEVELOPMENT LLC

Inventor： MOISION, Bruce ,  KEYES, Edward ,  BOWEN, Oliver ,  BRINKLEY, Devin ,  ERKMEN, Baris

IPC: H04L1/18 ,  H04B10/11

Abstract: Aspects of the disclosure provide techniques for automatic repeat request (ARQ) in a free-space optical communication (FSOC) architecture (Fig. 2). These techniques, including block-selective ARQ (Fig. 10), adaptive retransmission delay (Fig. 11), and random seed scrambling (Fig. 12), 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 (Figs. 5A-B, 10). Adaptive retransmission delay allows the retransmission delay to grow in the absence of feedback by the receiver, up to some defined limit (Fig. 11). And with random seed sampling, a scrambling sequence is incorporated to aid with frame syncing, which avoids the need for a line code (Figs. 8-9, 12). These aspects of the technology provide a robust communication process, and also reduce overhead costs associated with unnecessary retransmissions.

公开(公告)号：WO2021108440A1

公开(公告)日：2021-06-03

申请号：PCT/US2020/062071

申请日：2020-11-24

Applicant: X DEVELOPMENT LLC

Inventor： KIM, Nam-hyong ,  ERKMEN, Baris ,  KAZMIERSKI, Andrei ,  BRINKLEY, Devin ,  MOODY, John ,  DEMARTINI, Markus ,  LAI, Wei-cheng ,  BALCH, Halleh

IPC: H04B10/112

Abstract: Aspects of the disclosure provide an optical communication system 100. The system 100 may include a receiver lens system 142 configured to receive a light beam from a remote optical communication system and direct the light beam to a photodetector 146. The system may also include the photodetector 146. The photodetector 146 may be configured to convert the received light beam into an electrical signal, and the photodetector 146 may be positioned at a focal plane of the receiver lens system 142. The system may also include a phase aberrating element 310 arranged with respect to the receiver lens system 142 and the photodetector 146 such that the phase-aberrating element 310 is configured to provide uniform angular irradiance at the focal plane of the receiver lens system 142.

公开(公告)号：WO2020150145A1

公开(公告)日：2020-07-23

申请号：PCT/US2020/013339

申请日：2020-01-13

Applicant: X DEVELOPMENT LLC

Inventor： KIM, Nam-hyong ,  KAZMIERSKI, Andrei ,  BRINKLEY, Devin

IPC: H04B10/11 ,  G02B19/00 ,  G02B13/14

Abstract: The disclosure provides for a free-space optical communication system (100) that includes a first lens group (310), a field corrector lens (330), and a second lens group (320). The first lens group (310) is configured to receive light received from a remote free-space optical transmitter. The first lens group (310) has a first focal plane (316). The field corrector lens (330) is positioned between the first lens group (310) and the first focal plane (316) of the first lens group and positioned closer to the first focal plane (316) than the first lens group (310). The field corrector lens (330) also is made of material having an index of refraction of at least 2.0, and has a second focal plane (336). The second lens group (320) is positioned at the second focal plane (336) of the field corrector lens and is configured to couple light to a sensor (146). An associated method involves operating, by one or more processors, an optical communication device according to the light received at the sensor, specifically a photodetector.

公开(公告)号：WO2018118381A1

公开(公告)日：2018-06-28

申请号：PCT/US2017/064193

申请日：2017-12-01

Applicant: X DEVELOPMENT LLC

Inventor： MOISION, Bruce ,  ERKMEN, Baris ,  BRINKLEY, Devin

IPC: H04L27/00 ,  H04L27/04

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：WO2023048876A1

公开(公告)日：2023-03-30

申请号：PCT/US2022/041180

申请日：2022-08-23

Applicant: X DEVELOPMENT LLC

Inventor： ERKMEN, Baris, Ibrahim ,  BRINKLEY, Devin ,  EPP, Paul ,  MOODY, John

IPC: H04B10/11

Abstract: A free-space optical communication system includes an optical phased array (OPA) photonic integrated chip (114), a transceiver photonic integrated chip (112), and one or more processors (104). The OPA chip includes a plurality of array elements (120) and a plurality of phase shifters (121). The transceiver chip includes one or more transmitter components (116) and one or more receiver components (118). The one or more processors are configured to transmit a first signal via the OPA chip and the transceiver chip (402), and receive a second signal via the OPA chip and the transceiver chip (410).

公开(公告)号：WO2022072493A1

公开(公告)日：2022-04-07

申请号：PCT/US2021/052647

申请日：2021-09-29

Applicant: X DEVELOPMENT LLC

Inventor： BRINKLEY, Devin ,  CSONKA, Paul ,  MOZAFFARI, Sanam ,  ERKMEN, Baris, Ibrahim

IPC: H04B10/00 ,  G02B6/04

Abstract: A ffee-space optical communication device 102 includes an optical fiber bundle 118 and one or more processors 104. The optical fiber bundle 118 includes a central fiber 202 connected to a first photodetector, and a plurality of surrounding fibers 204, each surrounding fiber connected to a corresponding second photodetector. The one or more processors 104 are in communication with the first photodetector and each second photodetector. The one or more processors 104 are also configured to receive a current or voltage generated at the first photodetector and each second photodetector and to determine a pointing accuracy of a beam received at the optical fiber bundle 118 based on the current or voltage generated at the second photodetectors.

公开(公告)号：WO2020150196A1

公开(公告)日：2020-07-23

申请号：PCT/US2020/013447

申请日：2020-01-14

Applicant: X DEVELOPMENT LLC

Inventor： MOISION, Bruce ,  BRINKLEY, Devin ,  ERKMEN, Baris, Ibrahim

IPC: H04B10/112

Abstract: An optical communication system (102) includes an optical transmitter (112) and one or more processors (104). The optical transmitter (112) is configured to output an optical signal (20a), and includes an average-power-limited optical amplifier (204), such as an erbium-doped fiber amplifier (EDFA). The one or more processors (104) are configured to receive optical signal data related to a received power for a communication link (22) from a remote communication system (122) 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 ( 104) are configured to determine a duty cycle of the optical transmitter (112) based on a minimum on-cycle length and a predicted EDFA output power and operate the optical transmitter (112) 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 (22).

公开(公告)号：WO2018125751A2

公开(公告)日：2018-07-05

申请号：PCT/US2017/067919

申请日：2017-12-21

Applicant: X DEVELOPMENT LLC

Inventor： MOISION, Bruce ,  KEYES, Edward ,  BOWEN, Oliver ,  BRINKLEY, Devin ,  ERKMEN, Baris

IPC: H04L1/18 ,  H04B10/11

Abstract: Aspects of the disclosure provide techniques for automatic repeat request (ARQ) in a free-space optical communication (FSOC) architecture (Fig. 2). These techniques, including block-selective ARQ (Fig. 10), adaptive retransmission delay (Fig. 11), and random seed scrambling (Fig. 12), 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 (Figs. 5A-B, 10). Adaptive retransmission delay allows the retransmission delay to grow in the absence of feedback by the receiver, up to some defined limit (Fig. 11). And with random seed sampling, a scrambling sequence is incorporated to aid with frame syncing, which avoids the need for a line code (Figs. 8-9, 12). These aspects of the technology provide a robust communication process, and also reduce overhead costs associated with unnecessary retransmissions.

公开(公告)号：WO2023048910A1

公开(公告)日：2023-03-30

申请号：PCT/US2022/042025

申请日：2022-08-30

Applicant: X DEVELOPMENT LLC

Inventor： BRINKLEY, Devin ,  ERKMEN, Baris Ibrahim ,  ABRIL, Joaquin Matres ,  EPP, Paul

IPC: H04B10/25

Abstract: An optical phased array (OPA) photonic integrated chip (114) includes a plurality of array elements (120), a plurality of phase shifters (121), a plurality of combiners (230-234), and an edge coupler (236) configured to couple to a single mode waveguide. The plurality of phase shifters includes a layer of phase shifters that has a phase shifter connected to each array element in the plurality of array elements. The plurality of combiners is configured to connect the plurality of phase shifters to the edge coupler. The plurality of combiners includes a first combiner that has a first output that is connected to a second combiner or the edge coupler, and a second output of the first combiner is connected to a photodetector (240). An in-phase light portion at the first combiner is output through the first output, and an out-of-phase light portion at the first combiner is output through the second output.