I. Introduction
Picosecond optical pulse sources have been playing an important role in the study of ultrafast processes and there is a growing demand of short pulse generation in non-conventional wavelengths in ultrafast optical communications. However, high-quality picosecond laser is generally not available at some non-conventional wavelengths due to the lack of efficient gain medium. Fiber optical parametric amplifier [1], offers ultra-fast response, wide-gain bandwidth [2], high gain [3] and large wavelength detune from the pump [2], allows efficient short pulse generation at non-conventional wavelengths via idler generation.