摘要： Silicon core ?bers (SCFs) are emerging as a robust and ?exible waveguide platform that can exploit the high nonlinear coef?cients of silicon to perform compact nonlinear processing within an integrated ?ber geometry. Optical parametric ampli?cation (OPA) based on four-wave mixing (FWM) has been studied intensively over the past decade using chip-based silicon waveguides for a variety of telecommunication applications such as all-optical signal sampling, time-demultiplexing, pulse generation, and wavelength conversion. However, due to the strong nonlinear absorption associated with two photon and free carrier effects in silicon at telecom wavelengths, net on/off parametric gain has not been observed using a continuous-wave (CW) signal, and even when using pulses the gain has been limited to be 5.2 dB. Here, by tapering the SCF to tailor the dimensions such that we can achieve high coupling ef?ciency into a core with a sub-micron-sized diameter, required to access the anomalous dispersion region, we demonstrate OPA with a positive on/off gain up to 6.6 dB and bandwidth of more than 220 nm. Eventually, when fully integrated with conventional ?bers and components to improve the robustness of the system, we expect these tapered SCFs will ?nd wide-ranging applications in areas that require ef?cient wavelength conversion across a broad spectral band.