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    Light-sensitive gunn-effect device
    3.
    发明授权
    Light-sensitive gunn-effect device 失效
    灵敏的GUNN效应装置

    公开(公告)号：US3651426A

    公开(公告)日：1972-03-21

    申请号：US3651426D

    申请日：1970-06-24

    Applicant: ADVANCED TECHNOLOGY CENTER INC

    Inventor： BOATNER LYNN A ,  SEWELL KENNETH G

    IPC: H01L47/02 ,  H03B9/12 ,  H03C3/36 ,  H03C7/00 ,  H03M1/00 ,  H03B7/06

    CPC classification number: H03C7/00 ,  H01L47/023 ,  H03B9/12 ,  H03C3/36 ,  H03M1/60

    Abstract: Disclosed is a Gunn-effect device comprising, for example, a crystal of n-type gallium arsenide having alloyed contacts (e.g., indium and gold) which is switched from one frequency of oscillation to another by controlling the incident light while maintaining an appropriate temperature and bias voltage. It is believed that trap zones which are localized within the crystal by virtue of introducing acceptor impurities account for a frequency of oscillation different from the usual transit-time frequency. The Gunn domains and the incident light are made to dynamically perturb the trap system so as to achieve a nonequilibrium condition.

    Abstract translation: 公开了一种耿氏效应器件，其包括例如具有合金触点（例如，铟和金）的n型砷化镓的晶体，其通过控制入射光而从一个振荡频率切换到另一个频率，同时保持适当的温度 和偏置电压。 据信通过引入受体杂质而定位在晶体内的陷阱区域占据了与通常时间频率不同的振荡频率。 使得Gunn域和入射光动态扰动陷阱系统，以达到非平衡条件。

    Phase modulation laser communication system
    5.
    发明授权
    Phase modulation laser communication system 失效
    相位调制激光通信系统

    公开(公告)号：US3654473A

    公开(公告)日：1972-04-04

    申请号：US3654473D

    申请日：1969-04-28

    Applicant: HUGHES AIRCRAFT CO

    Inventor： NUSSMEIER THOMAS A

    IPC: H03C3/36 ,  H04B10/142 ,  H04B9/00

    CPC classification number: H03C3/36 ,  H04B10/548 ,  H04B10/671

    Abstract: In the disclosed laser communication system, at a transmitter a linearly polarized laser carrier beam is phase modulated with an informational signal such that when the resultant beam is resolved into two linearly polarized component beams in mutually perpendicular planes the respective component beams are shifted forwardly and backwardly in phase by an amount proportional to the informational signal. In a receiver the received phase modulated beam is combined with a local oscillator laser beam which is linearly polarized in a plane parallel to the plane of polarization of the carrier beam, and the resultant beam is separated into a pair of linearly polarized laser beams in respective planes parallel to the planes of the aforementioned transmitter component beams. These linearly polarized laser beams are converted into respective intermediate frequency electrical signals, and a reproduction of the informational signal is obtained by phase comparing these electrical signals.

    Abstract translation: 在所公开的激光通信系统中，在发射机处，线偏振激光载波波束用信号信号进行相位调制，使得当所得到的光束在相互垂直的平面中被分解为两个线性偏振分量波束时，各分量光束向前和向后移动 与信号信号成比例的数量的同相。 在接收机中，接收的相位调制光束与在平行于载波束的偏振平面的平面中线偏振的本地振荡器激光束组合，并且所得到的光束分成一对线性偏振激光束 平行于上述发射机部件光束的平面的平面。 这些线性偏振激光束被转换成各自的中频电信号，通过对这些电信号进行相位比较来获得信息信号的再现。

    FM modulation device
    9.
    发明授权
    FM modulation device 失效
    FM调制装置

    公开(公告)号：US5973820A

    公开(公告)日：1999-10-26

    申请号：US080312

    申请日：1998-05-18

    Applicant: Masaru Fuse ,  Kuniaki Utsumi ,  Seiichiro Kawashima ,  Koji Kikushima

    Inventor： Masaru Fuse ,  Kuniaki Utsumi ,  Seiichiro Kawashima ,  Koji Kikushima

    IPC: G02F2/00 ,  H03C3/36 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/54 ,  H04B10/548 ,  H04B10/564 ,  H04B10/572 ,  H04B10/61 ,  G02F1/23

    CPC classification number: H03C3/36

    Abstract: A branch portion 107 branches a modulating signal into two signals in opposite phases. One of them is inputted to an FM laser element 102. The other one is adjusted in propagation delay and in amplitude and then is inputted to an IM suppressing laser element 110. The FM laser element 102 outputs an optical-frequency-modulated signal around a wavelength .lambda.1, whose optical intensity is also modulated. A local light source 104 outputs light at a wavelength .lambda.0, which is different from the oscillation wavelength .lambda.1 of the FM laser element 102 by .DELTA..lambda.. The IM suppressing laser element 110 outputs an optical-intensity-modulated signal. The three lights are combined and inputted to a photodetection portion 106. The photodetection portion 106 applies a heterodyne detection to inputted lights to output an FM modulated signal corresponding to a beat signal of the outputted optical signal from the FM laser element 102 and the outputted light from the local light source 104 at frequency corresponding to the difference .DELTA..lambda. between the original two wavelengths, and also cancels the average-value variation component in the FM modulated signal with an electrical signal produced by square-law detecting the optical-intensity-modulated signal from the IM suppressing laser element 110, thereby producing an ideal FM modulated signal.

    Abstract translation: 分支部分107将调制信号分成相反相位的两个信号。 其中一个被输入到FM激光元件102.另一个被调整为传播延迟和幅度，然后被输入到IM抑制激光元件110.MF激光元件102输出一个光频调制信号 波长λ1，其光强度也被调制。 局部光源104输出波长λ0的光，其与FM激光元件102的振荡波长λ1不同，通过DELTAλ。 IM抑制激光元件110输出光强度调制信号。 三个光被组合并输入到光检测部分106.光检测部分106对输入的光进行外差检测，以输出对应于来自FM激光元件102的输出光信号的拍频信号的FM调制信号和输出的光 从本地光源104以与原始两个波长之间的差ΔTAλ相对应的频率，并且还利用通过检测光强度调制的平方律产生的电信号来消除FM调制信号中的平均值变化分量 来自IM抑制激光元件110的信号，从而产生理想的FM调制信号。

    Apparatus for modulating the output signal of a converter
    10.
    发明授权
    Apparatus for modulating the output signal of a converter 失效
    用于调制转换器的输出信号的装置

    公开(公告)号：US4450564A

    公开(公告)日：1984-05-22

    申请号：US299436

    申请日：1981-09-04

    Applicant: Lambertus J. Meuleman ,  Abram van de Grijp ,  Engel Roza

    Inventor： Lambertus J. Meuleman ,  Abram van de Grijp ,  Engel Roza

    IPC: H04B10/00 ,  H01S5/042 ,  H01S5/0683 ,  H03C3/36 ,  H04B10/02 ,  H04B10/155 ,  H04B10/18 ,  H04B14/02 ,  H01S3/10

    CPC classification number: H04B14/026 ,  H01S5/06835 ,  H03C3/36 ,  H04B10/504 ,  H04B10/564

    Abstract: Apparatus for modulating the output signal of a converter for converting electric signals into other signals, for example optical signals. An analog signal is applied to a subtraction device (6) the output signal of which controls a limiter (7). The binary output signal thereof controls the semiconductor laser diode (1) which is coupled to a photo-sensitive detector (3) for producing a feedback signal. After being amplified in a broad-band amplifier (9) and integrated in an integrator (13), this feedback signal is applied to the subtraction device (6), so that the feedback signal is subtracted from the analog signal. Variations in the optical output signal due to a non-linear conversion characteristic of the laser diode (1) and due to an optical retroaction of the fibre (2) on the laser diode, as well as output noise and signal-dependent amplitude variations, are reduced by the negative feedback.

    Abstract translation: 用于调制转换器的输出信号以将电信号转换为其它信号（例如光信号）的装置。 模拟信号被施加到其输出信号控制限幅器（7）的减法装置（6）。 其二进制输出信号控制耦合到光敏检测器（3）的半导体激光二极管（1）以产生反馈信号。 在宽带放大器（9）中放大并积分在积分器（13）中之后，该反馈信号被施加到减法器件（6），从而从模拟信号中减去反馈信号。 由于激光二极管（1）的非线性转换特性以及由于光纤（2）在激光二极管上的光学逆变而导致的光输出信号的变化以及输出噪声和信号相关幅度变化， 被负反馈减少。

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