Abstract
A novel asymmetrical twin-core photonic crystal fiber was proposed, whose effective overlap core area Aeff can be designed to synchronize the variation of Raman gain coefficient with respect to frequency. This fiber possesses a higher and flatter Raman gain efficiency coefficient curve rR=gR/Aeff over a specified band of wavelength than a conventional fiber. Therefore, it is a good candidate of gain medium for a flat, broad gain band fiber Raman amplifier. It was numerically demonstrated that for the Raman gain efficiency rR, relative fluctuations of less than 2.2% and 5.7% are achievable in the C (1530−1565 nm) band and L (1565−1625 nm) band, respectively.
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