In a first aspect of the invention there is provided a broadband radiation source device. being configured for generating broadband output radiation upon receiving substantially linearly polarized input radiation based on a modulation instability mechanism, comprising: a hollow-core photonic crystal fiber; and at least a first polarization element operable to impose a substantially circular or elliptical polarization on said input radiation prior to being received by said hollow-core photonic crystal fiber. In a second aspect of the invention there is provided a method of generating broadband output radiation, the method comprising: exciting a working medium comprised within a hollow-core photonic crystal fiber with input radiation to generate said broadband output radiation via a modulation instability mechanism; wherein said input radiation comprises a substantially circular or elliptical polarization.
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