光纤水下动态信号传输系统技术研究

Research on the Transmission System of Dynamic Signal for Underwater Optical Fiber

针对光纤在水下实际工程环境中动态损耗较大,会影响水下光纤动态传输系统可靠性的特点,使用了模场直径较小即弯曲损耗较小的1.3μm传输窗口,在光纤动态损耗估计的基础上,设计了基于光循环器的单波长1 310 nm双向传输系统和蝶形大功率光发射机,并验证了单波长双向传输系统性能,在长光缆信道衰减模拟装置衰减不小于数十分贝时,系统误码率小于10-9,试验结果表明,系统性能优良,水下远程单波长光缆双向动态传输的工程应用是可行的。

To enhance the reliability of underwater optical cable dynamic transmission system, which is reduced by higher dynamic loss of the commonly used fiber cable in actual underwater environment, a 1.3 μm transmission window with less bending loss is used. On the basis of the optical fiber＇s dynamic loss estimation, a optical circulator based hi-directional transmission system with single wavelength of 1 310 nm and a butterfly-shape high power optical transmitter are designed, and the performance of the bi-directional transmission system is verified. The results indicate that the system＇s bit error rate （BER） is less than 10^-9 when the attenuation of channel simulator for long optical fiber cable is decades of decibel, which proves the fiber cable feasible in engineering.