Abstract
Abstract In this work it is proposed a novel all-fiber circular polarization beam splitter (CPBS). The design is based on helically twisted twin-core photonic crystal fiber coupler (HTTC-PCF). The main characteristic of the proposed CPBS device is the capacity to spatially split circularly polarized optical modes with opposite handedness at the twin-cores. For the CPBS to work, a single arbitrary rotated linearly polarized optical mode can be used as an input signal as well as a combination of two circularly polarized modes with opposite handedness. The coupling characteristics of HTTC-PCF were analyzed as function of the photonic crystal fiber (PCF) structural parameters, helical twist-rate, wavelength and temperature. The analyses were performed using a full vector finite element method with helical space mapping formalism and the supermode theory. An all-fiber CPBS with 24.76 mm length, extinction ratio ( ER ) of ~50 dB and spectral bandwidth of ~36.79 nm (for ER > 10 dB) and ~ 11.43 nm (for ER > 20 dB) was obtained at 1550 nm central wavelength for a twist-rate of 15.70 rad/mm.
Published Version
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