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Improvement of carrier-to-noise ratio in subcarrier multiple access optical networks in the presence of multiple optical beat interference

机译：在存在多个光学节拍干扰的情况下，提高子载波多址光网络中的载波信噪比

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Summary form only given. The subcarrier multiple access (SCMA) systems using distributed feedback laser diodes (DFB-LDs) without wavelength control are very suitable for the upstream in passive optical networks (PON) from the point of view of realizing cost-effective and high-performance systems. However, it is well known that optical beat interference (OBI) is one of the serious problems. We have already proposed a method to greatly reduce the OBI which we have named the "LSM" method. This method employs multiplying the subcarrier signals and an additional signal. We experimentally and theoretically investigated the carrier-to-noise ratio (CNR) characteristics of frequency-modulated (FM) video signals by using the LSM method in the worst case that all of the OBI between any two LDs appeared in the subcarrier band. In this paper, the experimental result shows that the CNR values of the FM video signals can reach the available level by using the LSM method even if three OBIs exist in the subcarrier band, and the theoretical result shows that the acceptable number of OBI increases to ten by using DFB-LDs with an optical linewidth of 100 MHz.
机译：摘要表格仅给出。使用分布式反馈激光二极管（DFB-LD）的没有波长控制的副载波多址（SCMA）系统非常适合于从视图实现成本效益和高性能系统的点在无源光网络中的上游（PON）。然而，众所周知，光拍干扰（OBI）是严重的问题之一。我们已经提出了一种方法，大大减少我们有一个名为“LSM”方法OBI。该方法采用的副载波信号和附加信号相乘。通过使用在最坏情况下的LSM方法，所有的OBI的任何两者之间的激光二极管出现在副载波的频带，我们从实验和理论研究频率调制（FM）的视频信号的载波 - 噪声比（CNR）特性。在本文中，实验结果表明，该FM视频信号的CNR值可以通过使用LSM方法达到可用的水平，即使在副载波的频带中存在3个OBIS，和理论结果表明，OBI增加可接受的编号，以10，通过使用DFB-LD的100 MHz的光学线宽。

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