【摘要】 提出一种基于超连续谱梳状切割方案的多通道光载射频传输(ROF)系统光源全光生成方法.实验利用飞秒光脉冲经过2段长5 m、色散符号相反的高非线性光子晶体光纤,在1 550 nm的通信波段产生了带宽超过170 nm的超连续谱.使用本实验室自行设计、制作的取样光纤光栅对所得超连续谱进行滤波,产生了20个波长、峰值波动为±0.3 dBm的多波长梳状光谱,将每2个相邻波长滤出,即可作为ROF系统的一路光载毫米波,共可产生10路.结果表明,所产生的10路光载毫米波峰值波动小,调制深度大,每波长线宽窄,而且整个系统结构简单,插入损耗小,易于集成.更多还原

【Abstract】 A millimeter-wave-band multi-channel source generating method for wavelength-division-multiplexed(WDM) radio-on-fiber(ROF) systems is proposed.Firstly,the combined use of a femto-second semiconductor mode-locked laser and two 5m-long high nonlinear photonic crystal fibers with opposite dispersion values is demonstrated experimentally to implement a super-continuum with width of more than 170 nm around 1 550 nm.Secondly,a sampled fiber Bragg grating is used to filter spectrum.It is shown that the spectrum is sliced into 20 channels with ±0.3 dB peak fluctuation.Each two adjacent channels can be filtered out as one channel radio-frequency carrier.10-channel carriers are successfully obtained for WDM-ROF system.These ten-channel carriers have some advantages such as small gain fluctuation,large modulation depth and narrow width,etc..Besides,the whole system can be easily integrated for its simple structure and small insertion loss.更多还原