公开(公告)号：US09813151B2

公开(公告)日：2017-11-07

申请号：US14817985

申请日：2015-08-04

申请人： Ryan Wallace Kingsbury ,  Kathleen Michelle Riesing ,  Kerri Lynn Cahoy ,  Tam Nguyen Thuc Nguyen ,  David O. Caplan

发明人： Ryan Wallace Kingsbury ,  Kathleen Michelle Riesing ,  Kerri Lynn Cahoy ,  Tam Nguyen Thuc Nguyen ,  David O. Caplan

IPC分类号： H04B10/00 ,  H04B10/118

CPC分类号： H04B10/118

摘要： 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.

公开(公告)号：US10009115B2

公开(公告)日：2018-06-26

申请号：US13462555

申请日：2012-05-02

申请人： David O. Caplan

发明人： David O. Caplan

IPC分类号： H04B10/04 ,  H04B10/12 ,  H04B10/67

CPC分类号： H04B10/67

摘要： The present invention provides a simple means of demodulating optical signals, e.g. wideband M-ary orthogonal. The demodulator comprises an optical processor and a comparison module. The optical processor transforms M input optical signals into 2 log2(M) intermediary optical signals and the comparison module determines the logical representation of the input data based on log2(M) binary comparisons of the optical power of the intermediary signals. Example embodiments may be reconfigurable to receive optical signals using M-FSK, M-PPM, M-PolSK, and hybrid M-ary orthogonal modulation formats. Example embodiments also offer small size, weight and power consumption for both free-space and fiber optic environments as well as improved receiver sensitivity and reduced electron bandwidth requirements.

公开(公告)号：US20080285977A1

公开(公告)日：2008-11-20

申请号：US12151284

申请日：2008-05-05

申请人： David O. Caplan

发明人： David O. Caplan

IPC分类号： H04B10/00

CPC分类号： H04B10/504 ,  H04B10/564

摘要： The present invention addresses the problem of transmitting optical signals with high extinction ratios using low-power drive signals. At present, low-power optical transmitters typically operate with modulation extinction ratios of, at best, about 10 dB. Embodiments of the present invention may achieve extinction ratios exceeding 20 dB using low-power drive signals of under 20 mW at data rates on the order of Gbits/sec. In addition, the modulation may be achieved with both low-power and low-fidelity drive waveforms, enabling conventional and often noisy high-speed, low-power electronics to generate high-extinction, high-fidelity optical waveforms.

摘要翻译： 本发明解决了使用低功率驱动信号传输具有高消光比的光信号的问题。 目前，低功率光发射机通常以最大约10dB的调制消光比工作。 本发明的实施例可以使用低于20mW的低功率驱动信号，以Gbits / sec量级的数据速率实现超过20dB的消光比。 此外，可以通过低功耗和低保真驱动波形来实现调制，从而使传统的和经常嘈杂的高速，低功率电子产生高消光，高保真的光波形。

公开(公告)号：US08073342B2

公开(公告)日：2011-12-06

申请号：US12151284

申请日：2008-05-05

申请人： David O. Caplan

发明人： David O. Caplan

IPC分类号： H04B10/04

CPC分类号： H04B10/504 ,  H04B10/564

摘要： The present invention addresses the problem of transmitting optical signals with high extinction ratios using low-power drive signals. At present, low-power optical transmitters typically operate with modulation extinction ratios of, at best, about 10 dB. Embodiments of the present invention may achieve extinction ratios exceeding 20 dB using low-power drive signals of under 20 mW at data rates on the order of Gbits/sec. In addition, the modulation may be achieved with both low-power and low-fidelity drive waveforms, enabling conventional and often noisy high-speed, low-power electronics to generate high-extinction, high-fidelity optical waveforms.

摘要翻译： 本发明解决了使用低功率驱动信号传输具有高消光比的光信号的问题。 目前，低功率光发射机通常以最大约10dB的调制消光比工作。 本发明的实施例可以使用低于20mW的低功率驱动信号，以Gbits / sec量级的数据速率实现超过20dB的消光比。 此外，可以通过低功耗和低保真驱动波形来实现调制，从而使传统的和经常嘈杂的高速，低功率电子产生高消光，高保真的光波形。

公开(公告)号：US20100111540A1

公开(公告)日：2010-05-06

申请号：US12532560

申请日：2008-03-24

申请人： David O. Caplan ,  Mark L. Stevens

发明人： David O. Caplan ,  Mark L. Stevens

IPC分类号： H04B10/00 ,  H04L27/22 ,  H04B10/06

CPC分类号： H04B10/677

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20120281990A1

公开(公告)日：2012-11-08

申请号：US13462555

申请日：2012-05-02

申请人： David O. Caplan

发明人： David O. Caplan

IPC分类号： H04B10/06

CPC分类号： H04B10/67

摘要： The present invention provides a simple means of demodulating optical signals, e.g. wideband M-ary orthogonal. The demodulator comprises an optical processor and a comparison module. The optical processor transforms M input optical signals into 2 log2(M) intermediary optical signals and the comparison module determines the logical representation of the input data based on log2(M) binary comparisons of the optical power of the intermediary signals. Example embodiments may be reconfigurable to receive optical signals using M-FSK, M-PPM, M-PolSK, and hybrid M-ary orthogonal modulation formats. Example embodiments also offer small size, weight and power consumption for both free-space and fiber optic environments as well as improved receiver sensitivity and reduced electron bandwidth requirements.

摘要翻译： 本发明提供了解调光信号的简单方法，例如， 宽带M相正交。 解调器包括光学处理器和比较模块。 光学处理器将M个输入光信号变换为2个log2（M）中间光信号，并且比较模块基于中间信号光功率的log2（M）二进制比较来确定输入数据的逻辑表示。 示例性实施例可以是可重构的，以使用M-FSK，M-PPM，M-POLSK和混合M进制正交调制格式接收光信号。 示例性实施例还为自由空间和光纤环境提供小尺寸，重量和功率消耗以及改善的接收机灵敏度和减少的电子带宽要求。

公开(公告)号：US07181097B2

公开(公告)日：2007-02-20

申请号：US10097187

申请日：2002-03-13

申请人： David O. Caplan ,  Walid A. Atia

发明人： David O. Caplan ,  Walid A. Atia

IPC分类号： G02B6/12

CPC分类号： H04B10/25137 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/508

摘要： A system includes an optical transmitter that outputs an optical signal having a substantially Gaussian waveform and an optical receiver that is optically coupled to the optical transmitter and has an impulse response essentially matching the waveform. The impulse response and waveform preferably match in the time domain. The transmitter and receiver may be average-power-limited, using, for example, an erbium-doped fiber amplifier. To achieve a high signal-to-noise ratio, the waveform may be designed to minimize jitter, sample duration, matching parasitics, and inter-symbol interference (ISI). Such a waveform may be a return-to-zero (RZ) Gaussian or Gaussian-like waveform and may be transmitted in a variety of modulation formats. Further, the system may be used in WDM or TDM systems. A method for characterizing the time domain impulse response of an optical element used in the optical receiver is provided, where the method is optionally optimized using deconvolution and/or cross-correlation techniques.

摘要翻译： 一种系统包括：光发射机，其输出具有基本高斯波形的光信号和光接收器，光接收器光学耦合到光发射机并具有基本上与波形匹配的脉冲响应。 脉冲响应和波形优选在时域中匹配。 发射机和接收机可以是平均功率限制的，例如使用掺铒光纤放大器。 为了实现高信噪比，可以设计波形以最小化抖动，采样持续时间，匹配寄生效应和符号间干扰（ISI）。 这样的波形可以是归零（RZ）高斯或类似高斯波形的波形，并且可以以各种调制格式发送。 此外，该系统可以在WDM或TDM系统中使用。 提供了一种用于表征在光接收机中使用的光学元件的时域脉冲响应的方法，其中该方法可选地使用去卷积和/或互相关技术优化。

公开(公告)号：US20170214472A1

公开(公告)日：2017-07-27

申请号：US15148789

申请日：2016-05-06

申请人： David O. Caplan ,  Michael R. Watts ,  Zhan Su

发明人： David O. Caplan ,  Michael R. Watts ,  Zhan Su

IPC分类号： H04B10/67 ,  H04J14/02

CPC分类号： 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

摘要： 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.

公开(公告)号：US08958666B2

公开(公告)日：2015-02-17

申请号：US11649337

申请日：2007-01-03

申请人： David O. Caplan ,  Walid A. Atia

发明人： David O. Caplan ,  Walid A. Atia

IPC分类号： G02B6/12 ,  H04B10/2513 ,  H04B10/50 ,  H04B10/508 ,  G02B6/36

CPC分类号： H04B10/25137 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/508

摘要： A system includes an optical transmitter that outputs an optical signal having a substantially Gaussian waveform and an optical receiver that is optically coupled to the optical transmitter and has an impulse response essentially matching the waveform. The impulse response and waveform preferably match in the time domain. The transmitter and receiver may be average-power-limited, using, for example, an erbium-doped fiber amplifier. To achieve a high signal-to-noise ratio, the waveform may be designed to minimize jitter, sample duration, matching parasitics, and inter-symbol interference (ISI). Such a waveform may be a return-to-zero (RZ) Gaussian or Gaussian-like waveform and may be transmitted in a variety of modulation formats. Further, the system may be used in WDM or TDM systems. A method for characterizing the time domain impulse response of an optical element used in the optical receiver is provided, where the method is optionally optimized using deconvolution and/or cross-correlation techniques.

公开(公告)号：US20110274429A1

公开(公告)日：2011-11-10

申请号：US13071460

申请日：2011-03-24

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

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

IPC分类号： H04B10/00 ,  H04J14/06 ,  H04J14/02 ,  H04B10/30 ,  H04B10/12

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

摘要： A burst-mode differential phase shift keying (DPSK) communications system according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. An embodiment of the system utilizes a single interferometer in the receiver with a relative path delay that is matched to the DPSK symbol rate of the link. 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.

摘要翻译： 根据本发明的实施例的突发模式差分相移键控（DPSK）通信系统实现了光发射机和接收机之间的实际功率效率的多速率通信。 该系统的一个实施例利用与该链路的DPSK符号率匹配的相对路径延迟的接收机中的单个干涉仪。 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。