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    • 1. 发明授权
    • Bandwidth efficient phase shift keyed modulation over nonlinear distortion limited optical fiber links
    • 带宽有效的相移键控调制在非线性失真限制光纤链路上
    • US06590683B1
    • 2003-07-08
    • US09245160
    • 1999-02-04
    • Ralph Spickermann
    • Ralph Spickermann
    • H04B1000
    • H04B10/505H04B10/506H04B10/5165H04B10/5561H04B10/58
    • Systems and methods that increase the data transmission rate through a given length of optical fiber, or increase the distortion-limited distance for an optical fiber link at a given data rate using band efficient modulation. This is achieved by modulating data for transmission onto a carrier signal. The modulated signal is predistorted and an optical carrier is amplitude modulated using the predistorted signal. The amplitude modulated optical carrier is transmitted over the optical fiber link. The original modulated microwave signal is reproduced at a receiver. The original signal is demodulated to generate the originally transmitted data. In addition, to reduce the bandwidth required by the modulated carrier, it may be single-sideband modulated. By increasing the number of bits per symbol and keeping the symbol rate constant, the data rate for a given length of optical fiber may be increased using the present invention without introducing additional distortion in the fiber.
    • 通过给定长度的光纤增加数据传输速率的系统和方法,或者使用频带有效调制在给定数据速率下增加光纤链路的失真限制距离。 这通过调制用于传输到载波信号上的数据来实现。 调制信号是预失真的,并且使用预失真信号对光载波进行幅度调制。 幅度调制光载波通过光纤链路传输。 原始调制的微波信号在接收机处被再现。 原始信号被解调以产生原始传输的数据。 此外,为了减小调制载波所需的带宽,可以进行单边带调制。 通过增加每符号的比特数并保持符号率恒定,可以使用本发明增加给定长度的光纤的数据速率,而不会在光纤中引入额外的失真。
    • 6. 发明授权
    • Underwater load-carrier
    • 水下负载载体
    • US08997678B2
    • 2015-04-07
    • US13370816
    • 2012-02-10
    • Ralph SpickermannSteve N. Persall
    • Ralph SpickermannSteve N. Persall
    • B63G8/40B63G8/14B63G8/24E02F7/00
    • B63G8/24B63C7/08B63C7/10E02F7/005
    • An underwater load-carrier is disclosed that includes an underwater-balloon detachably attached to a container that is loaded with ballast. The underwater load-carrier is lowered into the water of an ocean and allowed to descend to the ocean bottom and there connected a mining-vehicle. The mining-vehicle loads mined nodules into the container while the container ejects ballast to maintain the container at a specified altitude above the ocean bottom. When nodule loading is complete, nodules and/or ballast is ejected to allow underwater load-carrier to rise to the ocean surface where mined nodules is unloaded from the container.
    • 公开了一种水下负载载体,其包括可拆卸地附接到装载有镇流器的容器的水下气囊。 水下负载载体下降到海洋的水中,允许下降到海底,并连接采矿车辆。 采矿车辆将开采的结节装载到集装箱中,同时容器弹出镇流器以将容器保持在海底以上的特定高度。 当结节加载完成时,弹出结节和/或镇流器,以允许水下负载载体上升到海洋表面,其中从容器卸载开采的结节。
    • 7. 发明授权
    • Programmable optical vector modulator and method for use in coherent optical communications
    • US07085500B2
    • 2006-08-01
    • US09845557
    • 2001-04-30
    • Ralph Spickermann
    • Ralph Spickermann
    • H04B10/04
    • H04B10/50
    • A transmitter comprising a programmable optical vector modulator and method for coherent optical signal communication. The transmitter includes a transmitter laser whose output is coupled by way of an optical fiber to an amplitude modulator. The output of the amplitude modulator is coupled by way of a length of optical fiber to a phase modulator. The phase modulator generates a modulated light output from the transmitter. Amplitude modulation is achieved by inputting data and a data clock signal to amplitude symbol mapping logic whose outputs are selectively weighted, summed, amplified and input to the amplitude modulator to amplitude modulate the output of the transmitter laser. Phase modulation is achieved by inputting the modulating data and the data clock signal to phase angle symbol mapping logic whose outputs are selectively weighted, summed, amplified, delayed to synchronize with the arrival of the light from the amplitude modulator, and input to the phase modulator to phase modulate the amplitude modulated output of the transmitter laser. The programmability of the vector modulator allows the transmission of an M-ary modulation format that maximizes the data transmission for a given optical dynamic range and bit error rate target. Also, the programmability allows for rapid change in modulation format to maximize data transmission for changes in optical dynamic range and bit error rate target. The M-ary constellation may be predistorted to compensate for equipment piece part variation and fiber nonlinear effects; in particular the effect commonly known as “self-phase modulation”.
    • 10. 发明授权
    • Use of bandwidth efficient modulation techniques in a wavelength division multiplexed optical link
    • 在波分复用光链路中使用带宽有效的调制技术
    • US06407837B1
    • 2002-06-18
    • US09200029
    • 1998-11-25
    • Ralph Spickermann
    • Ralph Spickermann
    • H04J1402
    • H04J14/0298
    • Systems and methods that improve data transmission over a wavelength division multiplexed optical link. First and second wavelength division multiplexed modulators modulate data for transmission onto a microwave carrier signal to produce first and second carrier signals having a first carrier frequency. A downconverter downconverts the first carrier signal to a lower carrier frequency. A combiner combines the downconverted and second carrier signals to provide a composite microwave signal. A wavelength division multiplexed transmitter transmits the composite microwave signal on a wavelength division multiplexed channel over an optical fiber. A wavelength division multiplexed receiver reproduces the composite microwave signal transmitted over the optical fiber. A splitter and filters separate out the downconverted and second carrier signals from the composite microwave signal. An upconverter upconverts the downconverted carrier signal from the lower carrier frequency to the first carrier frequency. Demodulators demodulates the upconverted and second carrier signals to generate the originally transmitted data. The systems and methods use higher order modulated microwave carriers (M-ary ASK, PSK, QAM, etc.) to intensity modulate the optical carrier. As a result, more than 1 bit/Hz of optical channel can be transmitted.
    • 通过波分复用光链路改善数据传输的系统和方法。 第一和第二波分复用调制器调制用于传输到微波载波信号上的数据,以产生具有第一载波频率的第一和第二载波信号。 下变频器将第一载波信号下变频到较低的载波频率。 组合器组合下变频和第二载波信号以提供复合微波信号。 波分复用发射机通过光纤在波分复用信道上发送复合微波信号。 波分复用接收机再现通过光纤传输的复合微波信号。 分路器和滤波器从复合微波信号中分离下变频和第二载波信号。 上变频器将下变频载波信号从较低载波频率上变频到第一载波频率。 解调器解调上变频和第二载波信号以产生原始传输的数据。 系统和方法使用高阶调制微波载波(M-ary ASK,PSK,QAM等)来强调光载波。 因此,可以传输超过1位/ Hz的光通道。