高增益、低DMG少模掺铒光纤及其放大性能研究

Study on Few-Mode Erbium-Doped Fiber with High Gain,Low DMG and its Amplification Performance

空分复用技术是大幅提高单根光纤数据传输容量的重要技术之一。对于长距离模分复用传输系统而言,少模掺铒光纤放大器是补偿光纤传输损耗必不可少的器件。因此,在少模掺铒光纤支持的所有模式中获得均衡增益至关重要,高差分模态增益会降低系统的传输性能。本文通过改进的化学气相沉积技术制备了18μm/124μm少模掺铒光纤,实验演示了基于该光纤的两模掺铒光纤放大器。当使用LP11b模式泵浦时,该放大器所支持的LP01和LP11a模式可以在1535~1560 nm波段获得19.4 dB以上的增益,差分模态增益最大为0.66 dB。

Space division multiplexing is one of the main technologies to greatly improve the data transmission capacity of a single optical fiber.Fewmode erbiumdoped fiber amplifier is essential to compensate for the transmission loss in long distance mode division multiplexing transmission systems.Therefore,obtaining equalization gain in all modes supported by fewmode erbiumdoped fiber is vitally important,and the high differential modal gain will reduce the transmission performance of the system.In this study,18μm/124μm fewmode erbiumdoped fiber was fabricated by modified chemical vapor deposition technique,and a twomode erbiumdoped fiber amplifier based on the fiber was demonstrated experimentally.The gain is above 19.4 dB for LP01 and LP11a modes and its differential modal gain is lower than 0.66 dB between 1535 nm and 1560 nm when the LP11b mode is pumped.