Author: Jing Du Source: Wuhan National Laboratory for Optoelectronics
Optical fiber can be seen as an ideal medium for analog signal links due to the following characteristics: very high bandwidth, low loss, light weight, small cross section, low cost, and high flexibility. Analog link over fiber has been applied in distributed antenna system, picocellular network, and remote areas. Moreover, few mode fiber (FMF) is able to support higher-order and orbital angular momentum (OAM) modes and further improve transmission capacity, having attracted increasing interest. Hence, a laudable goal would be to study the analog signal transmission performance in an FMF using high-order LP modes and OAM modes.
Jian Wang’s group at Wuhan National Laboratory for Optoelectronics (WNLO), Multi-Dimensional Photonics Laboratory (MDPL), has been devoted to the research of analog links over FMF. Directed by Prof. Jian Wang, PhD candidate Jing Du experimentally investigates analog links using LP01, LP11a, LP11b, OAM+1, and OAM-1 modes in a 5-km FMF, utilizing spurious free dynamic range (SFDR) of the second-order harmonic distortion (SHD) to evaluate the analog link performance. The obtained results indicate that the analog link performance through FMF is mainly affected by mode relative loss. Mode features, such as average differential mode delays, have less influence on the link performance. The work has been published on Optics Express (Vol. 25, PP. 3613-3620, 2017) with title “Demonstration of analog links using spatial modes in km-scale few mode fiber”.
Figure 1 Experiment results of analog links using LP and OAM modes in FMF.
These works are partially supported by the National Basic Research Program of China (973Program) (2014CB340004), the National Natural Science Foundation of China (NSFC) (11274131, 11574001, 61222502), the Program for New Century Excellent Talents in University (NCET-11-0182), and the Wuhan Science and Technology Plan Project (2014070404010201).
Links of the published papers:
Jing Du, Dequan Xie, Chen Yang, and Jian Wang, "Demonstration of analog links using spatial modes in km-scale few mode fiber," Opt. Express 25, 3613-3620 (2017).