弱耦合多芯少模光纤的声波导布里渊散射特性

Characteristics of Guided Acoustic Wave Brillouin Scattering in Uncoupled Seven-core Few-mode Fiber

光纤中的声波导布里渊散射(GAWBS)可在较低光功率水平激发,该散射噪声对大容量空分复用光纤通信、数字相干传输及光量子传输影响较大。针对空分复用光纤通信系统,文章对自制弱耦合7芯4模光纤的GAWBS特性进行了理论和实验研究。结果表明,由于不同纤芯与光纤中心的距离差异,弱耦合7芯4模光纤中不同纤芯具有明显的GAWBS分布差异。未来需要在不同的纤芯中采取不同的GAWBS噪声补偿方法以实现高信噪比和低误码率的空分复用传输。

The Guided Acoustic Wave Brillouin Scattering(GAWBS)in fibers will be excited at a low optical power level,which can cause large impairments on high-capacity spatial division multiplexing optical fiber communication,digital coherent transmission and optical quantum transmission.For spatial division multiplexing optical fiber communication system,we theoretically and experimentally investigate the characteristics of GAWBS in the self-made uncoupled seven-core four-mode fiber.The results indicate that,the cores exhibit the significant differences of GAWBS characteristics depending on their distances from the fiber center.In future,the disparate GAWBS noise compensation method for each core can be utilized to achieve a high signal-to-noise ratio for spatial division multiplexing transmission with low error rate.