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    • 21. 发明授权
    • Method for encoding and decoding digital data in holographic storage
media
    • US5450218A
    • 1995-09-12
    • US286480
    • 1994-08-04
    • John F. HeanueMatthew C. BashawLambertus Hesselink
    • John F. HeanueMatthew C. BashawLambertus Hesselink
    • G03H1/04G11B13/04G02B5/32
    • G03H1/0248G11B13/045
    • A method for encoding and decoding digital data for storage in a holographic medium (12). Digital data, consisting of binary data (B.sub.i) or grey scale data (A.sub.i), is encoded in bit groups or digit groups (B.sub.k, A.sub.k) containing at least k=1 bits or digits, respectively, by assigning to each bit group (B.sub.k) one reference bit (B.sub.r) and to each digit group (A.sub.k) two reference digits (A.sub.r1, A.sub.r2), assigning the bits of group (B.sub.k) to information bits (B.sub.j), assigning the digits of group (A.sub.k) to information digits (A.sub.j), assigning the reference bit (B.sub.r) and information digits (B.sub.j) to a reference pixel (P.sub.r) and information pixels (P.sub.j) chosen from pixels (24) of a holographic signal modulator (18), and assigning the reference digits (A.sub.r1, A.sub.r2) and information digits (A.sub.j) to reference pixels (P.sub.r1, P.sub.r2) and information pixels (P.sub.j) chosen from pixels (24) of the holographic signal modulator (18). Storing all pixels (24) by illuminating the holographic signal modulator (18) with a signal beam (22) which impresses upon the signal beam (29) pixels (24), guiding the signal beam (22) to the holographic medium (12) and storing the pixels (24) by directing a reference beam (26) at the holographic medium (12) from a predetermined angle .beta. and at a predetermined part of the holographic medium (12). Decoding the encoded binary data (B.sub.i) and encoded grey scale data (A.sub.i) by aiming the reference beam (26) at the holographic medium (12) at the same angle .beta. and location as during storage, recovering pixels (24) and recovering from them using a decoding unit (38) reference bits (B.sub.r) and information bits (B.sub.j) for each bit group (B.sub.k), and recovering reference digits (A.sub.r1, A.sub.r2) and information digits (A.sub.j) for each digit group (A.sub.k). Reconstructing the original binary data (B.sub.i) by differentiating the binary values of bits (B.sub.r) and (B.sub.j). Reconstructing the grey scale data (A.sub.i) by differentiating the reference digits (A.sub.r1, A.sub.r2) to obtain a benchmark (D.sub.r) and applying a binary operation on the benchmark (D.sub.r) and each of the information digits (A.sub.j).
    • 24. 发明授权
    • Differential video image compression in holographic media
    • 全息介质中的差分视频图像压缩
    • US5877873A
    • 1999-03-02
    • US685623
    • 1996-07-24
    • Matthew C. BashawJohn F. HeanueLambertus Hesselink
    • Matthew C. BashawJohn F. HeanueLambertus Hesselink
    • G03H1/10G11B7/0065G11C13/04G03H1/28
    • G03H1/10G11B7/0065G11C13/042G03H2001/2675G03H2210/11G03H2210/12G03H2210/22G03H2260/54
    • A video image F�k! is identified as a basis image and stored as a basis page S�k! in a holographic storage medium. A subsequent image F�k+n! is stored by recording in the medium a page S�k+n!=F�k+n!-a�k!F�k!, where a�k!.noteq.0 and preferably a�k!=1. The page S�k! is recorded with a reference beam R�k!, while S�k+n! is recorded with a reference beam R�k+n! orthogonal to R�k!. The basis page is reset whenever the average intensity of a page to be stored exceeds a predetermined threshold. An image F'�k! is retrieved by reading basis page S�k! and letting F'�k!=S�k!. Subsequent images F'�k+n! are retrieved as S�k+n!+b�k!S�k!, where b�k!.noteq.0 and preferably b�k!=a�k!=1. The page addition step is performed coherently, i.e. by accessing the medium with a reference wave function R�k+n!+b�k!R�k!. The coherent addition is achieved by using a compound phase-and-amplitude modulator in a phase-code-multiplexed system, and by simultaneously accessing the storage medium at two different angles in an angle-multiplexed system. Differential video compression leads to a reduction in interpage crosstalk and to a capacity increase in crosstalk-limited memories. Optical page-by-page addition allows fast readout and eliminates the need for a time-consuming electronic decompression step.
    • 视频图像F [k]被识别为基础图像并作为基本页S [k]存储在全息存储介质中。 通过在介质中记录S [k + n] = F [k + n] -a [k] F [k]来存储后续图像F [k + n],其中a [k] a [k] = 1。 以参考光束R [k]记录页S [k],而用与R [k]正交的参考光束R [k + n]记录S [k + n]。 每当要存储的页面的平均强度超过预定阈值时,基页被重置。 通过读取基本页S [k]并使F'[k] = S [k]来检索图像F'[k]。 随后的图像F'[k + n]被检索为S [k + n] + b [k] S [k],其中b [k] NOTEQUAL 0并且优选地b [k] = a [k] = 1。 相干地执行页面添加步骤,即通过访问具有参考波函数R [k + n] + b [k] R [k]的介质。 通过在相位码复用系统中使用复合相位和幅度调制器,并且在角度多路复用系统中以两个不同的角度同时访问存储介质来实现相干相加。 差分视频压缩导致分组串扰的减少和串扰限制存储器的容量增加。 光学逐页添加允许快速读出,并且不需要耗时的电子减压步骤。
    • 26. 发明申请
    • Thermally controlled spatial light modulator using phase modulation
    • 使用相位调制的热控空间光调制器
    • US20080088906A1
    • 2008-04-17
    • US11803044
    • 2007-05-11
    • Matthias WagnerShuyun WuCharles M. MarshallEugene Y. MaJohn F. Heanue
    • Matthias WagnerShuyun WuCharles M. MarshallEugene Y. MaJohn F. Heanue
    • G02F1/00
    • G02F1/0147G02B5/284G02F1/21G02F2001/213
    • An apparatus includes a thin-film interference filter structure having a generally wavelength-dependent resonant response to incident optical energy in a predetermined range of wavelengths. The thin-film interference filter structure includes a thermally tunable layer having a thermally tunable optical characteristic such that a range of wavelength-dependent resonant optical responses of the thermally tunable layer are induced by a corresponding range of thermal conditions of the thermally tunable layer. The thin-film interference filter structure is configured to (1) receive a spatially varying pattern of thermal energy at the thermally tunable layer to impart a corresponding spatially varying pattern to the thermally tunable characteristic of the thermally tunable layer, and (2) receive the incident optical energy into the thermally tunable layer and output optical energy having spatial modulation corresponding to the spatially varying pattern of the thermally tunable characteristic.
    • 一种装置包括对预定波长范围内的入射光能具有大致波长依赖的谐振响应的薄膜干涉滤波器结构。 薄膜干涉滤光器结构包括具有热可调谐光学特性的热可调谐层,使得热可调谐层的波长依赖性共振光学响应的​​范围由热可调谐层的相应热条件范围引起。 薄膜干涉滤光器结构被配置为(1)在热可调层处接收空间上变化的热能图案,以向热可调谐层的热可调谐特性赋予相应的空间变化图案,以及(2) 入射到光可调谐层中的光能,并且输出具有与热可调谐特性的空间变化图案相对应的空间调制的光能。
    • 27. 发明授权
    • Variable attenuation of free-space light beams
    • 自由空间光束的可变衰减
    • US06961506B2
    • 2005-11-01
    • US10221867
    • 2001-03-16
    • Armand P. NeukermansRajiv RamaswamiJohn F. HeanueBrian P. TremaineMarc Schuman
    • Armand P. NeukermansRajiv RamaswamiJohn F. HeanueBrian P. TremaineMarc Schuman
    • G02B6/26G02B6/35G02B26/08G02B6/00G02B26/02
    • G02B6/359G02B6/266G02B6/352G02B6/3556G02B6/356G02B6/357G02B6/3588G02B6/3594
    • One aspect is a method for controllably attenuating the beam of light (108) coupled between incoming and outgoing optical fibers (106) by misaligning minor surfaces (116a, 116b) included of an optical switching module (100). Misalignment of the mirror surfaces (116a and 116b) causes only a portion of the beam of light (108) propagating along the incoming optical fiber (106), which is less than when the light beam deflectors' mirror surfaces (116) are precisely aligned, to propagate along the outgoing optical fiber (108). Thus, the optical switching module (100) controllably attenuates the beam of light (108) coupled between the incoming and the outgoing optical fibers (106). Another aspect is a variable-optical-attenuator (“VOA”) (212) that includes an optically reflective membrane (222) upon which the beam of light (108) impinges. Application of an electrostatic field between an adjacent electrode (228) and the membrane (222) deforms the membrane (222) thereby attenuating an impinging beam of light (108).
    • 一个方面是通过使包括光开关模块(100)的小面(116a,116b)不对准来可控地衰减耦合在进入和输出光纤(106)之间的光束(108)的方法。 镜面(116a和116b)的不对准仅使得沿着入射光纤(106)传播的光束(108)的一部分小于当光束偏转器的镜面(116)为 精确对准,以沿着输出光纤(108)传播。 因此,光学开关模块(100)可控制地衰减耦合在输入和输出光纤(106)之间的光束(108)。 另一方面是可变光衰减器(“VOA”)(212),其包括光束(108)撞击在其上的光学反射膜。 相邻电极(228)和膜(222)之间的静电场的施加使膜(222)变形,从而衰减入射光束(108)。
    • 28. 发明授权
    • Tunable laser with microactuator
    • 微调激光可调激光器
    • US06847661B2
    • 2005-01-25
    • US09728212
    • 2000-11-29
    • John H. JermanJohn D. GradeJill D. BergerJohn F. Heanue
    • John H. JermanJohn D. GradeJill D. BergerJohn F. Heanue
    • G02B26/08H01S3/00H01S3/08H01S3/10H01S5/02H01S5/022H01S5/026H01S5/0683H01S5/0687H01S5/14H01S5/40
    • G02B26/0841H01S5/02248H01S5/0654H01S5/0683H01S5/0687H01S5/143
    • A tunable laser comprising a laser source for providing light with a wavelength along an optical path. A diffractive element is positioned in the optical path and spaced from the laser source for redirecting the light received from the laser source. A reflective element is positioned in the optical path and spaced from the diffractive element for receiving the light redirected by the diffractive element and for further redirecting the light back along the optical path to the reflective element. The diffractive element receives the light further redirected by the reflective element and returns the light along the optical path to the laser source. The optical path created by the laser source, the diffractive element and the reflective element causes the light to lase at the wavelength. At least one microactuator is coupled to one of the diffractive element and the reflective element for moving such element to select the wavelength of the light. A variety of microactuators that can be used with the tunable laser are provided.
    • 一种可调激光器,包括用于提供沿着光路的波长的光的激光源。 衍射元件位于光路中并且与激光源间隔开,以重定向从激光源接收的光。 反射元件位于光路中并与衍射元件间隔开,用于接收由衍射元件重定向的光,并且用于将光沿着光路再次重定向到反射元件。 衍射元件接收由反射元件进一步重定向的光并将光沿光路返回到激光源。 由激光源,衍射元件和反射元件产生的光路使光线以波长发光。 至少一个微致动器耦合到衍射元件和反射元件中的一个,用于移动该元件以选择光的波长。 提供了可与可调激光器一起使用的各种微型致动器。