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    • 5. 发明授权
    • Apparatus for receiving optical signal and method of controlling phase offset for differential quadrature phase shift keying
    • 用于接收光信号的装置和用于差分正交相移键控的相位偏移控制方法
    • US08565620B2
    • 2013-10-22
    • US12912870
    • 2010-10-27
    • Hwan-Seok ChungSun-Hyok ChangJyung-Chan LeeKwang-Joon Kim
    • Hwan-Seok ChungSun-Hyok ChangJyung-Chan LeeKwang-Joon Kim
    • H04B10/06
    • H04B10/677
    • An apparatus for receiving optical signals in DQPSK and method of controlling a phase offset in receiving optical signals for DQPSK is provided. An original optical signal modulated in DQPSK is received. The original optical signal is delayed by one bit to make a delay optical signal such that an interference on the original optical signal and the delay optical signal is performed. A control signal is generated by use of an interference result between the original optical signal and the delay optical signal. A phase offset for the interference between the original optical signal and the delay optical signal is controlled by use of the generated control signal. In receiving optical signals, the phase offset between the delay optical signal and the original optical signal is precisely controlled, thereby optimizing the transfer characteristics of an optical delay interferometer.
    • 提供一种用于接收DQPSK中的光信号的装置以及控制接收用于DQPSK的光信号的相位偏移的方法。 接收以DQPSK调制的原始光信号。 原始光信号被延迟一位以产生延迟光信号,使得对原始光信号和延迟光信号的干扰被执行。 通过使用原始光信号和延迟光信号之间的干扰结果来产生控制信号。 通过使用所生成的控制信号来控制原始光信号与延迟光信号之间的干扰的相位偏移。 在接收光信号时,精确控制延迟光信号与原始光信号之间的相位偏移,从而优化光延迟干涉仪的传输特性。
    • 9. 发明授权
    • Multi-degree cross-connector system, operating method and optical communication network using the same
    • 多度交叉连接器系统,操作方法和光通信网使用相同
    • US08155521B2
    • 2012-04-10
    • US12514977
    • 2006-12-06
    • Hwan-Seok ChungKwangloon KimSang-Soo LeeSun-Hyok Chang
    • Hwan-Seok ChungKwangloon KimSang-Soo LeeSun-Hyok Chang
    • H04J14/00
    • H04Q11/0005H04J14/0204H04J14/0212H04J14/0213H04J14/0217H04J14/0219H04Q2011/0015H04Q2011/0016H04Q2011/0039H04Q2011/0052
    • Provided are a network node which has a wavelength switching cross-connection function and can thus interconnect paths of a wavelength-division-multiplexed optical signal and convert wavelengths, and an operating method of the network node. Accordingly, it is possible to provide a multi-degree cross-connection system having a simple structure at lower cost by allowing transmission of optical signals supposed not to be added/dropped at a network node without converting them into electrical signals and performing O/E conversion or E/O conversion only on optical signals supposed to be added/dropped at a network node. In addition, it is possible to increase the expandability of networks by regenerating degraded signals and which can effectively utilize bandwidths by grooming low-speed electrical digital hierarchy signals and transmitting them as high-speed optical signals. Moreover, it is possible to increase the availability of network resources by performing wavelength conversion without the need of additional wavelength converters. Furthermore, it is possible to prevent multiplexed optical signals from being degraded by filtering even when the multiplexed optical signals are not demultiplexed into wavelengths. Still furthermore, it is possible to perform a multicast operation on input wavelengths.
    • 提供了具有波长切换交叉连接功能并且因此可以互连波分复用光信号的路径并转换波长的网络节点以及网络节点的操作方法。 因此,可以通过允许在网络节点处不被添加/丢弃的光信号的传输而不将它们转换成电信号并执行O / E来提供具有简单结构的多级交叉连接系统,其具有较低的成本 转换或E / O转换仅在光网络节点上被添加/删除的信号上。 此外,可以通过再生劣化信号来增加网络的可扩展性,并且可以通过梳理低速电子数字分层信号并将其作为高速光信号传输来有效地利用带宽。 此外,可以通过执行波长转换来增加网络资源的可用性,而不需要额外的波长转换器。 此外,即使当复用的光信号未被解复用为波长时,也可以防止多路复用的光信号被滤波劣化。 此外,可以对输入波长执行多播操作。
    • 10. 发明申请
    • MULTI-DEGREE CROSS-CONNECTOR SYSTEM, OPERATING METHOD AND OPTICAL COMMUNICATION NETWORK USING THE SAME
    • 多级交叉连接器系统,使用该方法的操作方法和光通信网络
    • US20100027996A1
    • 2010-02-04
    • US12514977
    • 2006-12-06
    • Hwan-Seok ChungKwangloon KimSang-Soo LeeSun-Hyok Chang
    • Hwan-Seok ChungKwangloon KimSang-Soo LeeSun-Hyok Chang
    • H04J14/00
    • H04Q11/0005H04J14/0204H04J14/0212H04J14/0213H04J14/0217H04J14/0219H04Q2011/0015H04Q2011/0016H04Q2011/0039H04Q2011/0052
    • Provided are a network node which has a wavelength switching cross-connection function and can thus interconnect paths of a wavelength-division-multiplexed optical signal and convert wavelengths, and an operating method of the network node. Accordingly, it is possible to provide a multi-degree cross-connection system having a simple structure at lower cost by allowing transmission of optical signals supposed not to be added/dropped at a network node without converting them into electrical signals and performing O/E conversion or E/O conversion only on optical signals supposed to be added/dropped at a network node. In addition, it is possible to increase the expandability of networks by regenerating degraded signals and which can effectively utilize bandwidths by grooming low-speed electrical digital hierarchy signals and transmitting them as high-speed optical signals. Moreover, it is possible to increase the availability of network resources by performing wavelength conversion without the need of additional wavelength converters. Furthermore, it is possible to prevent multiplexed optical signals from being degraded by filtering even when the multiplexed optical signals are not demultiplexed into wavelengths. Still furthermore, it is possible to perform a multicast operation on input wavelengths.
    • 提供了具有波长切换交叉连接功能并且因此可以互连波分复用光信号的路径并转换波长的网络节点以及网络节点的操作方法。 因此,可以通过允许在网络节点处不被添加/丢弃的光信号的传输而不将它们转换成电信号并执行O / E来提供具有简单结构的多级交叉连接系统,其具有较低的成本 转换或E / O转换仅在光网络节点上被添加/删除的信号上。 此外,可以通过再生劣化信号来增加网络的可扩展性,并且可以通过梳理低速电子数字分层信号并将其作为高速光信号传输来有效地利用带宽。 此外,可以通过执行波长转换来增加网络资源的可用性,而不需要额外的波长转换器。 此外,即使当复用的光信号未被解复用为波长时,也可以防止多路复用的光信号被滤波劣化。 此外,可以对输入波长执行多播操作。