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    • 1. 发明授权
    • Correlated photon pair optical communications system
    • 相关光子对光通信系统
    • US5418905A
    • 1995-05-23
    • US975542
    • 1993-02-18
    • John G. RarityPaul R. Tapster
    • John G. RarityPaul R. Tapster
    • H04B10/70H04B10/00
    • H04B10/70
    • An optical communications system (10) comprises a transmitter (12) and a receiver (14). A source (16) of correlated pairs of photons of conjugate energies provides first and second photon beams (38, 36). The first photon beam (38) passes through a modulated filter (50) to which a communications signal (52) is applied. A variable spectrum beam (54) is produced which is converted to a timing signal (68) of macroscopic optical pulses (66). The second photon beam (36) and timing signal (68) are transmitted to the receiver (14). The received timing signal (84) is converted to a series of electrical timing pulses (90). The received second photon beam (82) passes through an unmodulated filter (94) matched to the modulated filter (50) when the signal (52) is not applied. The unmodulated filter splits the beam (82) into two conjugate spectra photon beams (96, 98) which are then converted to first and second series of electrical pulses (108, 110) respectively. The pulses (90, 108, 110) enter a coincidence counter (92) which records coincidences between the timing pulses (90) and the first series of pulses (108) and between the timing pulses (90) and the second series of pulses (110). Two coincidence rates are obtained and subtraction of one from the other yields an output communications signal (112).
    • PCT No.PCT / GB91 / 01352 Sec。 371日期:1993年2月18日 102(e)日期1993年2月18日PCT 1991年8月8日PCT PCT。 公开号WO92 / 04785 日期:1992年3月19日。光通信系统(10)包括发射器(12)和接收器(14)。 共轭能量的光子的相关对的源(16)提供第一和第二光子束(38,36)。 第一光子束(38)通过被施加通信信号(52)的调制滤波器(50)。 产生可变光谱束(54),其被转换成宏观光脉冲(66)的定时信号(68)。 第二光子束(36)和定时信号(68)被发送到接收器(14)。 所接收的定时信号(84)被转换成一系列电定时脉冲(90)。 当不施加信号(52)时,所接收的第二光子束(82)通过与调制滤波器(50)匹配的未调制滤波器(94)。 未调制的滤波器将光束(82)分裂成两个共轭光谱光子束(96,98),然后将它们分别转换成第一和第二串联的电脉冲(108,110)。 脉冲(90,108,110)进入符合计数器(92),其记录定时脉冲(90)和第一系列脉冲(108)之间以及定时脉冲(90)和第二脉冲串( 110)。 获得两个符合率,并从另一个中减去一个产生输出通信信号(112)。
    • 3. 发明授权
    • Cryptographic receiver
    • 加密接收机
    • US06028935A
    • 2000-02-22
    • US624499
    • 1996-04-10
    • John G RarityPaul R Tapster
    • John G RarityPaul R Tapster
    • G01J9/00G02F1/01G09C1/00H04B10/00H04L9/08H04L9/38H04L9/12
    • H04L9/0858
    • A cryptographic receiver (10) includes photon detectors (52, 54, 56, 58) arranged to detect photons arriving from filters (22) and (24). A fiber coupler (14) randomly distributes each received photon (16) from an optical fiber toone of two photon channels (18, 20). The filters (22, 24) are each unbalanced Mach-Zehner interferometers with a phase modulator (34, 44) in one arm (28, 38). The filters (22, 24) impose non-orthogonal measurement bases on photons within the respective channels (18, 20). A signal processor (60) derives a cryptographic key-code by analysis of signals received from the photon detectors (52, 54, 46, 58).
    • PCT No.PCT / GB94 / 02067 Sec。 371日期:1996年4月10日 102(e)日期1996年4月10日PCT 1994年9月23日PCT公布。 第WO95 / 10907号公报 日期1995年04月20日密码接收器(10)包括被布置成检测从滤波器(22)和(24)到达的光子的光子检测器(52,54,56,58)。 光纤耦合器(14)将每个接收的光子(16)从光纤通道(18,20)的光纤随机分配。 滤波器(22,24)是在一个臂(28,38)中具有相位调制器(34,44)的每个不平衡的马赫 - 泽纳(Hammer-Zehner)干涉仪。 滤波器(22,24)对相应通道(18,20)内的光子施加非正交测量基。 信号处理器(60)通过分析从光子检测器(52,54,46,58)接收的信号来导出密码密钥码。