双泵浦光子晶体光纤参量放大研究

利用光子晶体光纤在不同零色散波长附近具有不同色散的特性，研究了在零色散波长为780 nm和1550 nm附近的双泵浦光子晶体光纤参量放大过程.在780 nm附近，讨论了零色散波长变化对双泵浦光子晶体光纤参量放大的影响.数值模拟结果表明:当零色散波长发生微小的变化时，信号增益谱带宽会发生很大的变化.当两泵浦光之间的波长差值减小时，零色散波长的变化对参量放大的影响在很大程度上可以得到抑制，但是增益带宽会有一定的减小.依据这一原理，在1550 nm附近设计光子晶体光纤中的色散平坦光纤参量放大，在5 m长的光子晶体光纤中，当峰值功率为10 W时，得到了增益为65 dB，带宽达到420 nm且极为平坦的增益谱.

Research of Two-pump Optical Parametric Amplification Using Photonic Crystal Fiber

Using the different dispersion characteristic of the photonic crystal fiber around different zero dispersion wavelength,the photonic crystal fiber optical parametric amplification was researched with two-pump lasers around 780 nm and 1550 nm.Near 780 nm,the impacts of zero dispersion wavelength fluctuations on two-pump photonic crystal fiber optical parametric amplification were investigated,and numerical simulations show that the signal gain bandwidth will vary greatly as the zero dispersion wavelength has a very little change.When the wavelength separation between the two pumps decreased,the impacts of zero dispersion wavelength fluctuations on two-pump photonic crystal fiber optical parametric amplification were restrained to a large extent,but the amplifier bandwidth will have some reduction.Based on this principle,the dispersion flattening optical parametric amplification was designed around 1550 nm.With pump power of 10 W,the gain of fiber optical parametric amplification can reach 65 dB in only 5 m photonic crystal fiber,meanwhile the bandwidth reaches 420 nm,and the gain spectrum is very flattened.