Factors Affecting Dual Pump Fiber Optical Parametric Amplification Gain

Abstract

The transmission performance of an optical transport system requires that optical fiber amplifiers be designed to amplify the signal along the fiber, the more the gain, the more span distance between amplifiers and the higher the data rate, as long as the signal is not distorted due to high optical power. Transmitting several wavelengths results in an increase in total optical power, this causes nonlinear interactions to be very effective. The transmission performance of the system can then be seriously degenerated via nonlinear signal distortion and power transfer between different wavelength channels. When two or more optical waves copropagate inside a birefringent single-mode fiber they can differ in their wavelengths and also in their states of polarization. The optical pulses can further couple with each other through fiber nonlinearity and the polarization of each field can change during propagation as a result of optically induced nonlinear birefringence. The coupling of two waves with the same frequency but different polarizations gives rise to a number of interesting nonlinear effects in optical fibers. We have theoretically studied the fiber nonlinear effects on the gain of fiber optical parametric amplifier (FOPA) using matlab and optism. Our results show that different channels interact giving varied degrees of polarization (DOP) at different channel spacing. It is also found out that the parametric gain increase with the increase in nonlinear parameter and fiber length. This study is of great significance in improving the transmission capacity of a long haul system and dense wavelength division multiplexing.