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公开(公告)号：US10075245B2
公开(公告)日：2018-09-11
申请号：US15148789
申请日：2016-05-06
Applicant: Massachusetts Institute of Technology
Inventor： David O. Caplan , Michael R. Watts , Zhan Su
CPC classification number: H04B10/677 , G02B6/12007 , G02B6/28 , G02B6/2938 , G02B6/29395 , G02F1/011 , G02F1/0147 , G02F2201/16 , G02F2203/055 , G02F2203/15 , G02F2203/58 , G02F2203/585 , H04B10/2575 , H04B10/61 , H04B10/66 , H04B10/67 , H04B10/671 , H04J14/02
Abstract: An optical receiver includes a cascade of optical filtering elements, each of which selects spectral components from incoming optical signals at a wavelengths aligned to filter passbands. The selected spectral components may be optically combined to form k pairs of intermediary signals, where k=log2(M). By comparing the k pairs of intermediary signals, k bits of a digital signal representing the incident signal may be generated. The filtering elements may be configured to perform demultiplexing and demodulation simultaneously, increasing functionality and reducing excess losses. The filtering elements may also be tuned so that the optical receiver may be reconfigured to accommodate different combinations of wavelengths and modulation formats, such as wavelength division multiplexed (WDM) on off keying (OOK), M-ary orthogonal formats including frequency shift keying (FSK) and pulse position modulation (PPM), differential phase shift keying, and hybrid combinations—providing rate and format flexibility and WDM scalability.
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公开(公告)号：US10374723B2
公开(公告)日：2019-08-06
申请号：US15881388
申请日：2018-01-26
Applicant: Massachusetts Institute of Technology
Inventor： David O. Caplan
Abstract: An apparatus for generating a processed optical signal includes a first laser configured to emit a first optical signal in response to a first drive signal. The first optical signal has a first phase shift depending on a first integrated amplitude of the first drive signal. The apparatus also includes a spectral-temporal filter, in optical communication with the first laser, to change a first spectral profile and a first temporal profile of the first optical pulse so as to generate the processed optical signal. Replacing a conventional continuous-wave (CW) laser and external modulation with filter-based modulation can achieve the same or better performance without high-fidelity low-noise input signals.
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公开(公告)号：US20180343066A1
公开(公告)日：2018-11-29
申请号：US15881388
申请日：2018-01-26
Applicant: Massachusetts Institute of Technology
Inventor： David O. Caplan
IPC: H04B10/556 , H04B10/67 , H04B10/50
CPC classification number: H04B10/5561 , H04B10/11 , H04B10/5055 , H04B10/50577 , H04B10/556 , H04B10/677 , H04J14/02
Abstract: An apparatus for generating a processed optical signal includes a first laser configured to emit a first optical signal in response to a first drive signal. The first optical signal has a first phase shift depending on a first integrated amplitude of the first drive signal. The apparatus also includes a spectral-temporal filter, in optical communication with the first laser, to change a first spectral profile and a first temporal profile of the first optical pulse so as to generate the processed optical signal. Replacing a conventional continuous-wave (CW) laser and external modulation with filter-based modulation can achieve the same or better performance without high-fidelity low-noise input signals.
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公开(公告)号：US10917173B2
公开(公告)日：2021-02-09
申请号：US16579914
申请日：2019-09-24
Applicant: Massachusetts Institute of Technology
Inventor： Ryan Wallace Kingsbury , Kathleen Michelle Riesing , Kerri Cahoy , Tam Nguyen Thuc Nguyen , David O. Caplan
IPC: H04B10/00 , H04B10/118 , H04B7/185
Abstract: Communication bottlenecks, particularly in the downlink direction, are a common problem for many CubeSat developers. As described herein, a CubeSat module for a CubeSat comprises an optical transmitter to transmit data to a remote terminal, a receiver to acquire an optical beacon from a remote terminal, and a fine-pointing module operably and directly coupleable to a coarse-pointing module of the CubeSat. The fine-pointing module is configured to point the optical transmitter toward the remote terminal with an accuracy range that overlaps with an accuracy range of the coarse-pointing module of the CubeSat so as to establish a communications link between the CubeSat and the remote terminal over a low-Earth-orbit (LEO) distance.
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Patent Agency Ranking
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
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.
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6.发明申请公开(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。
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公开(公告)号：US10530478B2
公开(公告)日：2020-01-07
申请号：US15805094
申请日：2017-11-06
Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventor： Ryan Wallace Kingsbury , Kathleen Michelle Riesing , Kerri Lynn Cahoy , Tam Nguyen Thuc Nguyen , David O. Caplan
IPC: H04B10/00 , H04B10/118 , H04B7/185
Abstract: Communication bottlenecks, particularly in the downlink direction, are a common problem for many CubeSat developers. As described herein, a CubeSat module for a CubeSat comprises an optical transmitter to transmit data to a remote terminal, a receiver to acquire an optical beacon from a remote terminal, and a fine-pointing module operably and directly coupleable to a coarse-pointing module of the CubeSat. The fine-pointing module is configured to point the optical transmitter toward the remote terminal with an accuracy range that overlaps with an accuracy range of the coarse-pointing module of the CubeSat so as to establish a communications link between the CubeSat and the remote terminal over a low-Earth-orbit (LEO) distance.
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公开(公告)号：US08886049B2
公开(公告)日：2014-11-11
申请号：US13934097
申请日：2013-07-02
Applicant: Massachusetts Institute of Technology
Inventor： David O. Caplan , Mark L. Stevens
CPC classification number: H04B10/677
Abstract: A filter-based method of demodulating differentially encoded phase shift keyed (DPSK) optical signals, such as commonly used binary-DPSK (DBDPSK) and quadrature DPSK (DQPSK) signals, that can achieve optimal receiver sensitivity is described. This approach, which combines filtering and differential phase comparison, can reduce the complexity and cost of DPSK receivers by obviating delay-line interferometer-based demodulation. This can improve receiver stability and reduce size, weight, and power, while maintaining the ability to achieve optimal communications performance.
Abstract translation: 描述了一种基于滤波器的解调差分编码的相移键控（DPSK）光信号，例如可以实现最佳接收机灵敏度的通常使用的二进制DPSK（DBDPSK）和正交DPSK（DQPSK）信号。 这种组合滤波和差分相位比较的方法可以通过消除基于延迟线干涉仪的解调来降低DPSK接收机的复杂性和成本。 这可以提高接收机的稳定性并减小尺寸，重量和功率，同时保持实现最佳通信性能的能力。
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公开(公告)号：US20140016943A1
公开(公告)日：2014-01-16
申请号：US13934097
申请日：2013-07-02
Applicant: Massachusetts Institute Of Technology
Inventor： David O. Caplan , Mark L. Stevens
IPC: H04B10/67
CPC classification number: H04B10/677
Abstract: A filter-based method of demodulating differentially encoded phase shift keyed (DPSK) optical signals, such as commonly used binary-DPSK (DBDPSK) and quadrature DPSK (DQPSK) signals, that can achieve optimal receiver sensitivity is described. This approach, which combines filtering and differential phase comparison, can reduce the complexity and cost of DPSK receivers by obviating delay-line interferometer-based demodulation. This can improve receiver stability and reduce size, weight, and power, while maintaining the ability to achieve optimal communications performance.
Abstract translation: 描述了一种基于滤波器的解调差分编码的相移键控（DPSK）光信号，例如可以实现最佳接收机灵敏度的常用二进制DPSK（DBDPSK）和正交DPSK（DQPSK）信号。 这种组合滤波和差分相位比较的方法可以通过消除基于延迟线干涉仪的解调来降低DPSK接收机的复杂性和成本。 这可以提高接收机的稳定性并减小尺寸，重量和功率，同时保持实现最佳通信性能的能力。
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