| In recent years, with the development of optical fiber communication technology, fiber optical parametric amplifier (FOPA) has attracted wide attention in the field of optical communication for its excellent performance. FOPA with ultra-high gain, wide bandwidth and low noise figure, has attracted more and more attention in lightwave systems for several signal-processing applications including optical signal amplification, phase conjugation, wavelength conversion and all-optical regeneration. With the increasingly deepening research on FOPA in optical communication systems, its power efficiency has become an issue of utmost importance.Taking into account the fiber optic parametric amplifier energy conversion efficiency, this paper deeply studies the FOPA theory. We put forward a new kind of FOPA model with a cascaded structure which can achieve the best power conversion. This model greatly improves the level of power efficiency of fiber optic parametric amplifier. The detailed work is as follows:(1)First, the background and application field of FOPA are introduced, and the advantages of FOPA compared to other amplifiers are analyzed. After, starting from the basic principle of FOPA, we research the various factors influencing the optical parametric amplifier power conversion.(2)According to the Schrodinger equation, the coupling equation between the four waves is derived to describe the four wave mixing (FWM) process of pump wave, signal wave and idler wave. We focus on the phase-matched of the parametric amplifier process, and then use the Hamiltonian operator to derive the best power conversion of the single and double-pumped FOPA in the case of different input conditions. Then, we use the simulations to prove that the best power conversion of the single and double-pumped FOPA is correct. We study and analyze the factors that affecting the FOPA best power conversion, which verified by software simulation.(3)We put forward a new type of cascaded fiber optical parametric amplifier with best power conversion (BPC-CFOPA) design model, which is based on FOPA best power conversion theory. We introduce the basic principle of BPC-CFOPA, and use the simulation to prove the model. A new kind of BPC-CFOPA operating at low pump power and low nonlinear coefficient of fiber is proposed to improve the amplifier performance, and verified by software simulation. Finally, we analyze the optical fiber loss and insertion loss that affect the performance of BPC-CFOPA. The solution to reduce the impact is given, that makes the BPC-CFOPA closely achieve the best power conversion (BPC). |
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