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2. 发明申请

WO2015079400A1 POLARISATION-INDEPENDENT COHERENT OPTICAL RECEIVER 审中-公开
标题翻译：极化独立相干光接收器
公开(公告)号：WO2015079400A1
公开(公告)日：2015-06-04
申请号：PCT/IB2014/066387
申请日：2014-11-27
申请人： SCUOLA SUPERIORE DI STUDI UNIVERSITARI E DI PERFEZIONAMENTO SANT'ANNA
发明人： CIARAMELLA, Ernesto , PRESI, Marco
IPC分类号： H04B10/61
CPC分类号： H04B10/614 , H04B10/611 , H04B10/6166
摘要： In a coherent optical receiver, the received signal and the signal generated by a local oscillator (3), having a frequency difference, with respect to the received signal, such that the receiver operates under intradyne conditions, are made to beat in a 3 x 3 optical coupler (2). A polarising beam splitter (5) is located on the path of one out of the received signal and the signal generated by the local oscillator, splits the signal applied thereto into two components with orthogonal polarisation and sends such components to two inputs of the coupler (2), which receives at the third input the other out of the received signal and the signal generated by the local oscillator. After photoelectric conversion, the signals outgoing from the coupler (2) are fed to analogue processing devices (7) generating an electrical signal representing the received signal, and that electrical signal is fed to a low pass filter (12) before being demodulated. The frequency difference between the signal from the local oscillator (3) and the received signal and the passband of the low pass filter (12) are such that a component of the electrical signal representing the received signal, oscillating at a frequency depending on the frequency difference and having amplitude and phase depending on the instant state of polarisation of the received signal, is substantially suppressed. A method for coherent reception of optical signals is also provided.
摘要翻译：在相干光接收机中，接收信号和本地振荡器（3）产生的相对于接收信号具有频差的信号，使得接收机在条件下工作，使其以3× 3光耦合器（2）。偏振分束器（5）位于接收信号之一的路径上，由本地振荡器产生的信号，将施加到其上的信号分离成具有正交极化的两个分量，并将这些分量发送到耦合器的两个输入端 2），其在第三输入端接收来自接收信号的另一个信号和由本地振荡器产生的信号。在光电转换之后，从耦合器（2）输出的信号被馈送到产生表示接收信号的电信号的模拟处理设备（7），并且在解调之前将电信号馈送到低通滤波器（12）。来自本地振荡器（3）的信号与接收信号之间的频率差和低通滤波器（12）的通带使得表示接收信号的电信号的分量以取决于频率的频率振荡基本上抑制了差分并且具有取决于接收信号的瞬时极化状态的幅度和相位。还提供了一种用于相干接收光信号的方法。

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