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    • 5. 发明申请
    • OPTICAL CODE GENERATION AND DETECTION BY MEANS OF FIBER BRAGG GRATINGS
    • 光纤代码生成和检测方法
    • WO0167643A3
    • 2001-12-27
    • PCT/GB0101076
    • 2001-03-09
    • UNIV SOUTHAMPTONRICHARDSON DAVID JOHNPETROPOULOS PERIKLISIBSEN MORTENTEH PEH CHIONG
    • RICHARDSON DAVID JOHNPETROPOULOS PERIKLISIBSEN MORTENTEH PEH CHIONG
    • G02B6/02G02F1/35H04J14/00G02B6/16G02B6/34
    • H04J14/005G02B6/02085G02B6/02152G02F1/3519
    • Optical code division multiple access (OCDMA) coder: decoder gratings have been fabricated. The modulated refractive index profile that makes up the OCDMA coder: decoder grating incorporates changes in polarity between OCDMA chips by discrete phase shifts, thereby to provide bipolar coding through phase modulation. (In another embodiment quadrupolar coding is achieved). For NRZ modulation, each grating section is either in phase with, or has a predetermined phase shift relative to, the preceding grating section, depending on whether the OCDMA signature has a change in polarity between chips. RZ modulation is also possible. Results are presented from specific examples of bipolar OCDMA with NRZ modulation, which show higher data rates (10 Gbit/s), shorter chip-lengths (6.4ps) and far longer code sequences (63 bits) than previously demonstrated. Other embodiments relate to optical packet switching, for example using the Internet Protocol (IP) or Asynchronous Transfer Mode (ATM).
    • 光码分多址(OCDMA)编码器:解码器光栅已经被制造出来。 组成OCDMA编码器的调制折射率分布:解码器光栅通过离散相移包含OCDMA芯片之间极性的变化,从而通过相位调制提供双极性编码。 (在另一实施例中,实现了四极编码)。 对于NRZ调制,取决于OCDMA签名是否具有芯片之间的极性变化,每个光栅部分与之前的光栅部分同相或具有预定的相移。 RZ调制也是可能的。 具有NRZ调制的双极性OCDMA的具体示例显示了结果,其显示出比以前演示的更高的数据速率(10Gbit / s),较短的码片长度(6.4ps)和更长的码序列(63位)。 其他实施例涉及光分组交换,例如使用因特网协议(IP)或异步传输模式(ATM)。
    • 7. 发明申请
    • APPARATUS FOR PROVIDING TIMING JITTER TOLERANT OPTICAL MODULATION OF A FIRST SIGNAL BY A SECOND SIGNAL
    • 用于提供第二信号的第一信号的时序抖动光学调制的装置
    • WO02075446A2
    • 2002-09-26
    • PCT/GB0201199
    • 2002-03-15
    • UNIV SOUTHAMPTONRICHARDSON DAVID JOHNLEE JU HANIBSEN MORTENPETROPOULOS PERIKLISTEH PEH CHIONG
    • RICHARDSON DAVID JOHNLEE JU HANIBSEN MORTENPETROPOULOS PERIKLISTEH PEH CHIONG
    • G02F1/35H04B10/2507H04B10/18H04J14/02
    • H04B10/2507G02F1/3515G02F2201/02G02F2201/307
    • Apparatus for providing timing jitter tolerant optical modulation of a first signal (1) by a second signal (2), the first signal having a first wavelength (3), the second signal comprising a plurality of second signal pulses (4) having a second pulse shape (5) and a second wavelength (6), and the apparatus comprising a first signal input port (8), a second signal input port (9), a coupler (10), a grating (11) and a non-linear optical device (12), the apparatus being configured to direct the second signal (2) at the second signal input port (9) to the non-linear optical device (12) via the coupler (10) and the grating (11), and to direct the first signal (1) at the first signal input port (8) to the non-linear optical device (12); the grating (11) being a superstructured fibre Bragg grating that converts the second signal pulses (4) into intermediary pulses (13) each having an intermediary pulse shape (14); the intermediary pulse shape (14) being such that it provides a switching window (19) within the non-linear optical device (12).
    • 用于通过第二信号(2)提供第一信号(1)的定时抖动容忍光调制的装置,所述第一信号具有第一波长(3),所述第二信号包括多个第二信号脉冲(4),所述第二信号脉冲具有第二信号 脉冲形状(5)和第二波长(6),并且所述装置包括第一信号输入端口(8),第二信号输入端口(9),耦合器(10),光栅(11) 线性光学装置(12),该装置被配置为经由耦合器(10)和光栅(11)将第二信号输入端口(9)处的第二信号(2)引导到非线性光学装置(12) 并且将第一信号输入端口(8)处的第一信号(1)引导到非线性光学装置(12); 光栅(11)是将第二信号脉冲(4)转换成具有中间脉冲形状(14)的中间脉冲(13)的超结构光纤布拉格光栅; 中间脉冲形状(14)使得其在非线性光学装置(12)内提供开关窗口(19)。