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    • 42. 发明授权
    • Receiver for an optical communications system and method for operating such a system
    • 用于光通信系统的接收机和用于操作这种系统的方法
    • US06404528B1
    • 2002-06-11
    • US09085517
    • 1998-05-27
    • Thomas Pfeiffer
    • Thomas Pfeiffer
    • H04B1000
    • H04J14/005
    • A receiver is disclosed for receiving coded optical a signals in an optical asynchronous communications system using a CDMA method based on periodic spectrum encoding. It has a first optical detector unit (PD1) and a second optical detector unit (PD2) which are preceded by a first periodic optical filter (Rx1) and a second periodic optical filter (Rx2), respectively. The roundtrip time of the second filter (Rx2) is shifted by approximately one quarter of the lightwave period of the received signal with respect to the roundtrip time of the first filter (Rx1). The inputs of the filters (Rx1, Rx2) are connected to the communications system through an optical splitter (KOP). The amplitudes of the outputs of the two filters are squared by means of two squarers (Q1, Q2) and added by means of an adder (AD). This makes the receiver (R) less sensitive to any drift of the filter transfer function.
    • 公开了一种用于在使用基于周期性频谱编码的CDMA方法的光学异步通信系统中接收编码光信号的接收机。 它具有分别在第一周期性滤光器(Rx1)和第二周期性滤光器(Rx2)之前的第一光学检测器单元(PD1)和第二光学检测器单元(PD2)。 第二滤波器(Rx2)的往返时间相对于第一滤波器(Rx1)的往返时间被移位接收信号的光波周期的大约四分之一。 滤波器(Rx1,Rx2)的输入通过光分路器(KOP)连接到通信系统。 两个滤波器的输出的幅度通过两个平方(Q1,Q2)平方,并通过加法器(AD)相加。 这使得接收器(R)对于滤波器传递函数的任何漂移较不敏感。
    • 43. 发明授权
    • Receiver for an optical communications system, filter device, and method for operating such a system
    • 用于光通信系统的接收器,滤波器装置以及用于操作这种系统的方法
    • US06215573B1
    • 2001-04-10
    • US09085859
    • 1998-05-28
    • Thomas Pfeiffer
    • Thomas Pfeiffer
    • H04B1000
    • H04B10/671
    • A receiver (R) is disclosed for receiving coded optical signals in an asynchronous optical transmission system using a CDMA method based on periodic spectrum encoding. The receiver (R) has a filter device (Rx) for decoding received signals as well as an optical detector unit (PD). The filter device (Rx) consists of a periodic filter (PRx) and a prefilter (VOR) whose transfer function causes the cosine transform of the optical frequency spectrum of the signal to be limited to a predeterminable range of a tuning curve. This reduces crosstalk between adjacent channels in the tuning range, and increases the maximum permissible number of transmitters.
    • 公开了一种用于在使用基于周期性频谱编码的CDMA方法的异步光传输系统中接收编码光信号的接收机(R)。 接收器(R)具有用于解码接收信号的滤波器装置(Rx)以及光学检测器单元(PD)。 滤波器装置(Rx)由周期滤波器(PRx)和预滤波器(VOR)组成,其传递函数使信号的光频谱的余弦变换被限制在调谐曲线的可预定范围。 这减少了调谐范围内相邻通道之间的串扰,并增加了发射机的最大允许数量。
    • 46. 发明授权
    • Positionable support head
    • 可定位支撑头
    • US5806821A
    • 1998-09-15
    • US634157
    • 1996-03-28
    • Edward PhillipsThomas Pfeiffer
    • Edward PhillipsThomas Pfeiffer
    • F16C11/10F16M11/00F16M11/14A47F5/00
    • F16M11/14F16C11/106F16M2200/022Y10T403/32311Y10T403/32631
    • A coupling for mounting and positioning photographic, motion picture and video accessories and the like. A receiving base couples the positioning head to an equipment stand shaft, the receiving base being rotatable about the axis of the stand shaft. A first terminus of the receiving base incorporates an axially oriented beveled surface which is disposed within a cylindrical bore disposed through the head housing. The receiving base is maintained within the cylindrical bore in the housing through the engagement of and the force imposed thereon by an impinging stud bearing upon the beveled surface. A support post is mounted within the cylindrical bore of the housing extending outwardly in opposition to the receiving base. The end of the support shaft extending from the housing is fully rotatable about its interface with the housing. The engagement of the impinging stud against the beveled surface of the receiving base places the adjacent ends of the receiving base and support shaft in frictional engagement permitting the support shaft to be secured in a desired position.
    • 一种用于安装和定位摄影,电影和视频配件等的耦合器。 接收基座将定位头连接到设备支架轴,所述接收基座可围绕支架轴的轴线旋转。 接收基座的第一端部包括轴向定向的倾斜表面,其设置在通过头部壳体设置的圆柱形孔内。 接收基座通过接合和其上施加的撞击柱塞轴承在斜面上的力而保持在壳体中的圆柱形孔内。 支撑柱安装在壳体的圆柱形孔内,与接收基座相反地向外延伸。 从壳体延伸的支撑轴的端部可以围绕其与壳体的界面完全旋转。 碰撞螺柱抵靠接收基座的斜面的接合将接收基座和支撑轴的相邻端部摩擦接合,允许支撑轴固定在期望的位置。
    • 48. 发明授权
    • Grip head
    • 握头
    • US5735499A
    • 1998-04-07
    • US627703
    • 1996-03-29
    • Edward PhillipsThomas Pfeiffer
    • Edward PhillipsThomas Pfeiffer
    • F16M13/02A47B96/06
    • F16M13/02F16M11/24
    • A coupling for mounting and positioning photographic, motion picture and video accessories and the like. A mounting sleeve is adapted to be secured to an equipment supporting member. A fixed positioning disc depends from and is integral with the mounting sleeve. A cylindrical shaft is axially coupled to and extends from the fixed positioning disc. A first rotatable positioning disc is disposed about the cylindrical shaft, a frictional stabilizing member being disposed between the fixed positioning disc and the first rotatable positioning disc. A second rotatable positioning disc is annularly disposed about the cylindrical shaft in proximity to the first rotatable positioning disc. The adjacent surfaces of the first and second rotatable positioning discs have disposed therein reciprocally aligned pairs of linear channels of varying width and depth, each pair of linear channels being adapted to receive and secure equipment supporting shafts of differing cross section. A securing handle is coupled to the cylindrical shaft and is adapted to impose an axial force to engage the rotatable discs and thereby securely position each pair of aligned, linear channels at any position along a 360.degree. arc relative to the axis of the mounting sleeve.
    • 一种用于安装和定位摄影,电影和视频配件等的耦合器。 安装套筒适于固定到设备支撑构件上。 固定的定位盘由安装套筒组成并与其成一体。 圆柱形轴轴向联接到固定定位盘并从固定定位盘延伸。 第一可旋转定位盘围绕圆柱形轴设置,摩擦稳定构件设置在固定定位盘和第一可旋转定位盘之间。 第二可旋转定位盘环绕圆柱形轴设置在靠近第一可旋转定位盘的位置。 第一和第二可旋转定位盘的相邻表面在其中布置成具有不同宽度和深度的往复对齐的线性通道对,每对线性通道适于接收和固定不同横截面的支撑轴的设备。 固定手柄联接到圆柱形轴上,并且适于施加轴向力以接合可旋转盘,从而在相对于安装套筒的轴线的360°弧的任何位置处可靠地定位每对对齐的线性通道。
    • 49. 发明授权
    • Mode-locked fiber laser having an optical path length controller for a
fiber resonator
    • 具有用于光纤谐振器的光路长度控制器的锁模光纤激光器
    • US5708670A
    • 1998-01-13
    • US558834
    • 1995-11-15
    • Thomas Pfeiffer
    • Thomas Pfeiffer
    • H01S3/07H01S3/06H01S3/067H01S3/083H01S3/098H01S3/17
    • H01S3/06791H01S3/107H01S3/1109
    • The pulse repetition frequency of an optical pulse generator built with a fiber laser (LAS) is synchronized to a fixed clock frequency (fc). The synchronization is accomplished via means (M) for changing the optical path length of the resonator (RES), which is controlled by a signal from a control device (RE). The criterion for the synchronization is the effective value of an interference signal superimposed on the signal light, which increases with increasing deviation of the pulse repetition frequency from the clock frequency. A portion of the output signal (A) of fiber laser (LAS) is optically/electrically converted by the control device (RE), and the effective value of the interference signal is determined by filtering and rectifying the electrical signal obtained in this manner. After subsequent amplification and regulation, the control signal for the means (M) to change the optical wavelength is obtained. The control signal is additionally modulated with a wobble signal, so that the pulse repetition frequency always varies around the optimum value and is synchronized in this way.
    • 用光纤激光器(LAS)构建的光脉冲发生器的脉冲重复频率与固定时钟频率(fc)同步。 通过用于改变由来自控制装置(RE)的信号控制的谐振器(RES)的光路长度的装置(M)来实现同步。 同步的标准是叠加在信号光上的干扰信号的有效值,随着脉冲重复频率与时钟频率的偏差的增加而增加。 通过控制装置(RE)对光纤激光器(LAS)的输出信号(A)的一部分进行光/电转换,并且通过对以这种方式获得的电信号进行滤波和整流来确定干扰信号的有效值。 在随后的放大和调节之后,获得用于改变光学波长的装置(M)的控制信号。 控制信号用摆动信号附加调制,使得脉冲重复频率总是在最佳值附近变化并且以这种方式同步。
    • 50. 发明授权
    • Mode-locked fiber ring laser
    • 锁模光纤环激光
    • US5546414A
    • 1996-08-13
    • US483545
    • 1995-06-07
    • Thomas Pfeiffer
    • Thomas Pfeiffer
    • H01S3/07H01S3/06H01S3/067H01S3/083H01S3/091H01S3/098H01S3/136
    • H01S3/136H01S3/06791H01S3/107H01S3/1109Y10S372/703
    • A passively mode-locked fiber ring laser (LAS) is disclosed for generating optical pulses whose repetition frequency is settable. The mode-locked fiber ring laser (LAS) contains an erbium-doped fiber (ER), a ring resonator (RES), a pump-light source (PUMP), an optical modulator (MOD), and a feedback loop (RS). A portion of the signal light, which is produced by stimulated emission and is composed of a plurality of pulse repetition frequencies, is processed in the feedback loop (RS) into a drive signal which is coupled to the control input of the optical modulator (MOD). The feedback loop (RS) includes an adjustable filter which filters the desired pulse repetition frequency from the signal light. Thus, optical pulses of a given repetition frequency are developed in the ring resonator (RES) and at the output (OUT) of the passively mode-locked fiber ring laser (LAS).
    • 公开了一种用于产生其重复频率可设定的光脉冲的被动锁模光纤环形激光器(LAS)。 锁模光纤环激光器(LAS)包含掺铒光纤(ER),环形谐振器(RES),泵浦光源(PUMP),光调制器(MOD)和反馈环路(RS) 。 通过受激发射产生并且由多个脉冲重复频率组成的信号光的一部分在反馈回路(RS)中被处理成驱动信号,该驱动信号耦合到光调制器的控制输入(MOD )。 反馈回路(RS)包括可调滤波器,其从信号光中滤出所需的脉冲重复频率。 因此,给定重复频率的光脉冲在环形谐振器(RES)和被动锁模光纤环形激光器(LAS)的输出(OUT)处产生。