Theoretical Research On The Gain And Noise Characteristics In Optical Parametric Amplifier

The optical amplifier is an indispensable key component in the optical fiber communication system. For the past decades, the Optical Parametric Amplifier (OPA) has attracted worldwide attention because of the potential for achieving high gain, low noise and large bandwidth. According to the different nonlinear medium, the OPA can be divided into two categories, namely, Fiber Optical Parametric Amplifier (FOPA) and Silicon Optical Parametric Amplifier (SOPA), which are all based on the nonlinear effects in the medium. By utilizing the phenomenon of Four-Wave Mixing (FWM) and achieving the phase-matching condition, the signal can be amplified by the pump constantly, while generating a new wavelength which is named idler. In addition, OP As can be also divided into the Phase Insensitive OPA (PIA) and Phase Sensitive OPA (PSA) according to whether there is an idler in the input port. This paper mainly researches the gain and noise characteristics of the PSA and dual-pumped SOPA and the details are as follow.1. Starting from the OPA’s researching background, researching significance as well as the researching status in domestic and foreign and taking the FOPA for example to describes the basic theory and analysis method of OPA.2. The PSA amplification process is mainly analyzed by simulating, what’more, the non-degenerate distributed PSA system with DSF+SMF+DSF is described. According to the gain simulation, we know that the gain is related to the relative phase among the input light beams, and parts of them exhibit a positive gain, and the others exhibit a negative gain. Besides, according to the simulation results about the Amplified Quantum Noise (AQN) and Pumping Transfer Noise (PTN), we know that the noise figure is below the3dB (quantum noise limiting), and sometimes can even be less than0dB.3. The theoretical knowledge and simulation results of SOP A amplification process based on SOI rib waveguide are introduced to obtain a conclusion that the length, width and height of the SOI rib waveguide have a great impact on the gain and noise. Additionally, the influence of Raman effect on the gain and Relative Intensity Noise (RIN) in dual-pump SOPA is numerically investigated. When the Raman effect is considered, how the gain and RIN transfer value vary with the relevant parameters is also described.