Loop-assisted coherent matched detector for parallel time-frequency sampling
Loop-assisted coherent matched detector for parallel time-frequency sampling
复制标题
用于并行时频采样的环路辅助相干匹配检测器
DOI：
10.1109/jlt.2016.2645224
复制
发表时间：
2017
影响因子：
4.7
通讯作者：
Naokatsu Yamamto
中科院分区：
文献类型：
--
作者：
Takahide Sakamoto;Guo-Wei Lu;Naokatsu Yamamto
光学采样主要在时域或频域中执行。在前一种方法中，通过将接收到的信号与本地生成的超短脉冲进行光混合来临时获取采样点。在后一种方法中，对接收信号进行频谱切片和分解，将其作为频域中的采样点。在本文中，作为一种替代方法，我们提出并研究了一种称为光学时频域采样的光学采样技术，其中通过光电相干匹配探测器以光电方式在时频域中获取采样点。使用这种技术，可以解复用和检测超宽带多载波信号的子信道，例如在100、400 Gb/s、1 Tb/s 或更高，无需依赖传统时域或频域采样方法所需的超短脉冲或高分辨率光学滤波器。此外，在本文中，我们提出并演示了一种环路辅助相干匹配检测器，该检测器简单实用地将时频采样扩展到仅使用单个相干匹配检测器的并行采样配置。提供了一些实验证明，重点关注正交时频域复用 (OTFDM) 信号（一种超宽带多载波信号）的解复用和检测。使用单组低速 10 Gbaud 光接收器的环路辅助相干匹配检测器可同时检测和测量 160 Gb/s QPSK-OTFDM 信号的所有子通道。
Optical sampling is performed mostly in either time or frequency domain. In the former approach, sampling points are temporally taken by photo-mixing of received signals with locally generated ultrashort pulses. In the latter approach, the received signal is spectrally sliced and decomposed, which are taken as sampling points in the frequency domain. In this paper, as an alternative way, we propose and investigate an optical sampling technique called optical time-frequency-domain sampling, in which sampling points are taken in the time-frequency domain in an optoelectronic manner, by means of optoelectronic coherent matched detectors. Using this technique, it is possible to demultiplex and detect subchannels of ultrawideband multi-carrier signals at e.g. 100, 400 Gb/s, 1 Tb/s or higher, without relying on either ultrashort pulses or high-resolution optical filters necessary in the conventional time- or frequency-domain sampling approaches. Moreover, in this paper, we propose and demonstrate a loop-assisted coherent matched detector that simply and practically extends the time-frequency sampling to parallel sampling configuration just using a single coherent matched detector. Provided are some experimental proof focusing on demultiplexing and detection of orthogonal time-frequency-domain multipelxed (OTFDM) signals, a sort of ultrawideband multicarrier signals. All subchannels of 160-Gb/s QPSK-OTFDM signals are simultaneously detected and measured with the loop-assisted coherent matched detector employing a single set of low-speed 10-Gbaud photo-receivers.