半导体光放大器的非简并时延四波混合理论

Theory of Delayed-Time Non-Degenerate Four-Wave Mixing Semiconductor Optical Amplifier

用二能级宽带模型研究了半导体光放大器 (SOA)中非简并相共轭四波混合信号强度随时间延迟的变化规律。结果表明 ,对这种情形的非简并四波混合共轭信号强度随时间延迟τ变化表明为载流子脉动 ,且脉动信号以退相速率衰减。鉴于目前用简并四波混合对半导体光放大器超快过程的测量需要大功率激光器作激发源、大光学实验平台和复杂的探测设备的情况下 ,提出了基于全光通信器件构成非简并四波混合观测半导体光放大器载流子脉动、退相时间新方法 ,这不仅便于选取抽运与探测光源波长 (光通信窗口波长 ) 。

The signal intensity of phase-conjugation-ty pe delayed-time four-wave mixing (TDFWM) with incoherent light is studied based on the two-level broad band model of semiconductor optical amplifier (SOA). Th e theoretical results show that the signal intensity not only decays with the de phasing rate of SOA but also pulsates with the delay time. Since the experimenta l investigation of both the carrier pulsation and the dephasing time using degen erate four wave mixing are limited only in the application cases of high-power laser, large optical experimental platform and sophisticated detection devices at present, a novel scheme composed of all-optical communication devices is pro posed based on non-degenerate four-wave mixing. This means that both pump wave length and probe wavelength not only are easily selected but also an experimenta l setup can be minimized.