Division multiplexing and demultiplexing means lightwave communication
system comprising optical time
    1.
    发明授权
    Division multiplexing and demultiplexing means lightwave communication system comprising optical time 失效
    分路复用和解复用是指包括光时间的光波通信系统

    公开(公告)号:US4991975A

    公开(公告)日:1991-02-12

    申请号:US275454

    申请日:1988-11-22

    IPC分类号: H04J14/08 H04L7/033

    CPC分类号: H04J14/08 H04L7/0337

    摘要: Disclosed is a time division multiplexed optical communication system that is capable of operation at relatively high bit rates and that is relatively stable and immune to crosstalk and noise. The system comprises receiver means wherein the timing signal for demultiplexing is derived from the fully multiplexed optical pulse stream by means that comprise a narrow band receiver and timing means that produce a lower-frequency timing signal from the output of the narrow band receiver. The timing signal is used to drive one or more optical switches. In one embodiment of the invention the receiver means have a binary-tree architecture and the timing signals are substantially sinusoidal. In another embodiment the receiver means have a linear-bus architecture and the timing signals are pulse-like.

    摘要翻译: 公开了一种时分复用光通信系统,其能够以相对高的比特率操作并且相对稳定并且不受串扰和噪声的影响。 该系统包括接收机装置,其中用于解复用的定时信号通过包括窄带接收机和从窄带接收机的输出产生较低频定时信号的定时装置从全复用光脉冲流导出。 定时信号用于驱动一个或多个光开关。 在本发明的一个实施例中,接收机装置具有二进制树结构,并且定时信号基本上是正弦的。 在另一个实施例中,接收器装置具有线性总线架构,并且定时信号是类似脉冲的。

    Wavelength tunable composite cavity laser
    4.
    发明授权
    Wavelength tunable composite cavity laser 失效
    波长可调谐复合腔激光器

    公开(公告)号:US4955028A

    公开(公告)日:1990-09-04

    申请号:US173488

    申请日:1988-03-25

    摘要: Wavelength tunability and single frequency output are achieved in a coherent light source employing an adjustably controllable reflector. The light source includes a gain medium coupled to a single-mode fiber having a partially reduced cladding region at a predetermined distance from the gain medium. A Bragg reflector is either formed on the reduced cladding region of the single-mode fiber or formed on an external element in close proximity to the reduced cladding region. A single resonant optical cavity is formed by placing another reflector on the side of the gain medium opposite the gain medium-to-fiber coupling. Wavelength tuning of the light source is accomplished by controllably adjusting the period or the Bragg reflector element.

    摘要翻译: 波长可调性和单频输出在采用可调节可控反射器的相干光源中实现。 光源包括耦合到单模光纤的增益介质,其具有距离增益介质预定距离的部分减小的包层区域。 布拉格反射器或者形成在单模光纤的还原包层区域上,或者形成在紧邻还原包层区域的外部元件上。 通过在增益介质的相对于增益介质到光纤耦合的一侧放置另一个反射器来形成单个谐振光学腔。 通过可控地调节周期或布拉格反射器元件来实现光源的波长调谐。

    Traveling wave electrooptic devices
    5.
    发明授权
    Traveling wave electrooptic devices 失效
    行波电光装置

    公开(公告)号:US4553810A

    公开(公告)日:1985-11-19

    申请号:US487249

    申请日:1983-04-21

    CPC分类号: G02F1/0356

    摘要: Prior art techniques for velocity matching the optical wave and the modulating electrical wave in traveling wave, electrooptic devices includes the use of phase reversals and intermittent interaction. This results in a device whose frequency response includes a single peak. It has been discovered that by reducing the length of the interaction intervals between the electrical and optical systems, a multiplicity of harmonically related frequency peaks can be obtained. Furthermore, by combining the phase reversal and intermittent interaction techniques in a common device, the available bandwidth can be doubled.

    摘要翻译: 用于速度匹配光波和行波中调制电波的现有技术技术,电光装置包括使用相位反转和间歇相互作用。 这导致频率响应包括单个峰值的装置。 已经发现,通过减小电和光学系统之间的相互作用间隔的长度,可以获得多个谐波相关的频率峰值。 此外,通过将相位反转和间歇相互作用技术组合在通用设备中,可用带宽可以加倍。

    Polarization-independent optical wavelength selective coupler
    6.
    发明授权
    Polarization-independent optical wavelength selective coupler 失效
    偏振无关光波长选择耦合器

    公开(公告)号:US5495543A

    公开(公告)日:1996-02-27

    申请号:US372253

    申请日:1995-01-13

    摘要: A double-periodic grating is described for obtaining polarization-independent filtering and coupling. The grating may be viewed as a combination of two gratings with slightly different grating periods. The two periods are carefully chosen to match the difference in propagation constants of the TE and TM polarization modes such that both modes are coupled at the same wavelength.A novel method of obtaining a double-periodic grating is described.

    摘要翻译: 描述了用于获得偏振无关滤波和耦合的双周期光栅。 光栅可以被视为具有稍微不同的光栅周期的两个光栅的组合。 仔细选择两个周期以匹配TE和TM偏振模式的传播常数的差异,使得两种模式在相同波长下耦合。 描述了一种获得双周期光栅的新方法。

    Tunable polarization independent wavelength filter
    9.
    发明授权
    Tunable polarization independent wavelength filter 失效
    可调谐偏振独立波长滤波器

    公开(公告)号:US4390236A

    公开(公告)日:1983-06-28

    申请号:US245626

    申请日:1981-03-19

    摘要: Tunable, polarization independent wavelength filtering is obtained in a circuit configuration comprising an input polarization selective coupler which separates the TM and TE mode waves. A first, wavelength selective mode converter, in the TE mode wavepath, converts the TE mode wave energy at the selected wavelength to the TM mode. Similarly, a second wavelength selective mode converter, located in the TM mode wavepath, converts the TM mode wave energy at the selected wavelength to the TE mode. An output polarization selective coupler combines the TE and TM mode wave energy at the selected wavelength in one output wavepath and combines the balance of the input signal in a second wavepath. By cascading a plurality of such circuits, each tuned to a different wavelength, a wavelength multiplexed signal can be demultiplexed.

    摘要翻译: 在包括分离TM和TE模式波的输入偏振选择耦合器的电路配置中获得可调谐的偏振独立波长滤波。 在TE模式波导路径中的第一个波长选择模式转换器将所选波长的TE模式波能转换成TM模式。 类似地,位于TM模式波导路径中的第二波长选择模式转换器将所选波长的TM模波能转换为TE模式。 输出偏振选择耦合器在一个输出波形路径中将TE和TM模式波能量组合在所选波长处,并将输入信号的平衡组合在第二波形路径中。 通过级联多个这样的电路,每个调谐到不同的波长,波分复用信号可以被解复用。

    Velocity mismatched modulator
    10.
    发明授权
    Velocity mismatched modulator 失效
    速度失配调制器

    公开(公告)号:US4381139A

    公开(公告)日:1983-04-26

    申请号:US182432

    申请日:1980-08-29

    IPC分类号: G02F1/313 G02B5/14

    CPC分类号: G02F1/3134

    摘要: The coupling efficiency between a pair of identical optical waveguides (11, 12) is modulated by a traveling electrical wave (14, 15). Because the propagating constants of the optical and modulating systems are not equal, the interaction between them is limited to periodic intervals along the optical wavepaths. By the appropriate selection of this spatial period, a velocity match between the modulating and optical systems is simulated.

    摘要翻译: 一对相同光波导(11,12)之间的耦合效率由行进电波(14,15)调制。 由于光学和调制系统的传播常数不相等,它们之间的相互作用被限制在沿着光波路径的周期性间隔。 通过对该空间周期的适当选择,模拟调制和光学系统之间的速度匹配。