公开(公告)号：US09647765B2

公开(公告)日：2017-05-09

申请号：US14981175

申请日：2015-12-28

Applicant: Massachusetts Institute of Technology

Inventor： David O. Caplan ,  Neal W. Spellmeyer ,  Bryan S. Robinson ,  Scott A. Hamilton ,  Don M. Boroson ,  Hemonth G. Rao ,  Marc C. Norvig

IPC: H04B10/00 ,  H04B10/556 ,  H04B10/67 ,  H04L27/20 ,  H04L27/22 ,  H04J14/00 ,  H04L27/26

CPC classification number: E21B49/00 ,  E21B47/0002 ,  G01V1/40 ,  H04B10/5561 ,  H04B10/677 ,  H04L27/2075 ,  H04L27/2096 ,  H04L27/223 ,  H04L27/2601

Abstract: A burst-mode phase shift keying (PSK) communications apparatus according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. Embodiments may operate on differential PSK (DPSK) signals. An embodiment of the apparatus includes an average power limited optical transmitter that transmits at a selectable data rate with data transmitted in bursts, the data rate being a function of a burst-on duty cycle. DPSK symbols are transmitted in bursts, and the data rate may be varied by changing the ratio of the burst-on time to the burst-off time. This approach offers a number of advantages over conventional DPSK implementations, including near-optimum photon efficiency over a wide range of data rates, simplified multi-rate transceiver implementation, and relaxed transmit laser line-width requirements at low data rates.

公开(公告)号：US10128949B2

公开(公告)日：2018-11-13

申请号：US15054546

申请日：2016-02-26

Applicant: Massachusetts Institute of Technology

Inventor： Don M. Boroson ,  Bryan S. Robinson ,  Robert J. Menrad ,  John Rush ,  Kenneth Perko

IPC: H04B10/00 ,  H04B10/118 ,  H04B10/60 ,  H04B10/516 ,  H04J14/02 ,  H04B7/19 ,  H04B7/195

Abstract: A wide-field telescope and focal plane array (FPA) that look at Earth and satellites in low- and medium-Earth orbit (LEO and MEO) from a satellite in higher orbit, such as geostationary Earth orbit (GEO), can serve as a node in an on-demand, optical multiple access (OMA) communications network. The FPA receives asynchronous low-rate signals from LEO and MEO satellites and ground stations at a signal rate determined in part by the FPA frame rate (e.g., kHz to MHz). A controller tracks the low-rate signals across the FPA as the signal sources orbit Earth. The node also includes one or more transmitters that relay the received information to other nodes via wavelength-division multiplexed (WDM) free-space optical signals. These other signals may include low-rate telemetry communications, burst transmissions, and continuous data relay links.

公开(公告)号：US20160134377A1

公开(公告)日：2016-05-12

申请号：US14981175

申请日：2015-12-28

Applicant: Massachusetts Institute of Technology

Inventor： David O. Caplan ,  Neal W. Spellmeyer ,  Bryan S. Robinson ,  Scott A. Hamilton ,  Don M. Boroson ,  Hemonth G. Rao ,  Marc C. Norvig

IPC: H04B10/556

CPC classification number: E21B49/00 ,  E21B47/0002 ,  G01V1/40 ,  H04B10/5561 ,  H04B10/677 ,  H04L27/2075 ,  H04L27/2096 ,  H04L27/223 ,  H04L27/2601

Abstract: A burst-mode phase shift keying (PSK) communications apparatus according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. Embodiments may operate on differential PSK (DPSK) signals. An embodiment of the apparatus includes an average power limited optical transmitter that transmits at a selectable data rate with data transmitted in bursts, the data rate being a function of a burst-on duty cycle. DPSK symbols are transmitted in bursts, and the data rate may be varied by changing the ratio of the burst-on time to the burst-off time. This approach offers a number of advantages over conventional DPSK implementations, including near-optimum photon efficiency over a wide range of data rates, simplified multi-rate transceiver implementation, and relaxed transmit laser line-width requirements at low data rates.

Abstract translation: 根据本发明的实施例的突发模式相移键控（PSK）通信装置能够实现光发射机和接收机之间的实际功率效率的多速率通信。 实施例可以在差分PSK（DPSK）信号上操作。 该装置的实施例包括平均功率受限的光发射机，其以可选择的数据速率与以突发方式传输的数据进行发射，数据速率是突发占空比的函数。 DPSK符号以突发方式发送，并且可以通过改变突发打开时间与突发关闭时间的比率来改变数据速率。 与传统的DPSK实现相比，这种方法提供了许多优点，包括在宽范围的数据速率下的近最佳光子效率，简化的多速率收发器实现，以及在低数据速率下宽松的发射激光线宽要求。

公开(公告)号：US20130148983A1

公开(公告)日：2013-06-13

申请号：US13748777

申请日：2013-01-24

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Bryan S. Robinson ,  Don M. Boroson ,  Scott A. Hamilton ,  Shelby J. Savage

IPC: H04B10/04

CPC classification number: H04B10/5563 ,  H04B10/5051 ,  H04B10/548

Abstract: Described are an FSK modulator and a method for large-alphabet FSK modulation. The FSK modulator and the method are based on filtering of a multi-tone optical source such as a mode-locked laser which provides a comb distribution of tones. A frequency-selective component selects for transmission a subset of the tones. In various embodiments the frequency-selective component is a Mach-Zehnder interferometer filter or a microring resonator filter. A second frequency-selective component selects a subset of the tones from the comb distribution provided by the first frequency-selective component. Still more frequency-selective components can be used according to the number of tones supplied by the multi-tone optical source to the FSK modulator. The optical signal exiting the last frequency-selective component includes only a single tone which corresponds to the symbol to be transmitted.

Abstract translation: 描述了FSK调制器和用于大字母FSK调制的方法。 FSK调制器和方法基于滤波多色调光源，例如提供色调的梳状分布的锁模激光器。 频率选择分量选择传输音调的子集。 在各种实施例中，频率选择部件是马赫 - 曾德干涉仪滤波器或微环谐振器滤波器。 第二频率选择分量从由第一频率选择分量提供的梳状分布中选择音调的子集。 根据由多音调光源向FSK调制器提供的音调数量，可以使用更多的频率选择性组件。 离开最后频率选择分量的光信号仅包括对应于待传输的符号的单个音调。

公开(公告)号：US11522607B2

公开(公告)日：2022-12-06

申请号：US17578702

申请日：2022-01-19

Applicant: Massachusetts Institute of Technology

Inventor： Don M. Boroson ,  Bryan S. Robinson ,  Jade Wang ,  Kathleen M. Riesing ,  Jamie W. Burnside ,  Curt Schieler ,  Bryan C. Bilyeu ,  Jessica Chang

IPC: H04B10/112 ,  H04L1/18

Abstract: Communication systems and methods for high-data-rate, high-efficiency, free-space communications are described. High-speed optical modems and automatic repeat request can be employed to transmit large data files without data errors between remote devices, such as an earth-orbiting satellite and ground station. Data rates over 100 Gb/s can be achieved.

公开(公告)号：US08625999B2

公开(公告)日：2014-01-07

申请号：US13748777

申请日：2013-01-24

Applicant: Massachusetts Institute of Technology

Inventor： Bryan S. Robinson ,  Don M. Boroson ,  Scott A. Hamilton ,  Shelby J. Savage

IPC: H04B10/04

CPC classification number: H04B10/5563 ,  H04B10/5051 ,  H04B10/548

Abstract: Described are an FSK modulator and a method for large-alphabet FSK modulation. The FSK modulator and the method are based on filtering of a multi-tone optical source such as a mode-locked laser which provides a comb distribution of tones. A frequency-selective component selects for transmission a subset of the tones. In various embodiments the frequency-selective component is a Mach-Zehnder interferometer filter or a microring resonator filter. A second frequency-selective component selects a subset of the tones from the comb distribution provided by the first frequency-selective component. Still more frequency-selective components can be used according to the number of tones supplied by the multi-tone optical source to the FSK modulator. The optical signal exiting the last frequency-selective component includes only a single tone which corresponds to the symbol to be transmitted.

Abstract translation: 描述了FSK调制器和用于大字母FSK调制的方法。 FSK调制器和方法基于滤波多色调光源，例如提供色调的梳状分布的锁模激光器。 频率选择分量选择传输音调的子集。 在各种实施例中，频率选择部件是马赫 - 曾德干涉仪滤波器或微环谐振器滤波器。 第二频率选择分量从由第一频率选择分量提供的梳状分布中选择音调的子集。 根据由多音调光源向FSK调制器提供的音调数量，可以使用更多的频率选择性组件。 离开最后频率选择分量的光信号仅包括对应于待传输的符号的单个音调。