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Single polarization operation is ensured by high differential leakage loss between fundamental TE and TM modes.
Nevertheless, such an ability generally comes at the cost of a limited set of operating conditions, i.e., a small frequency bandwidth, a narrow acceptance angle range, and a single polarization operation.
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The original single-polarization operation range in the long-wavelength region extends to the short wavelength caused by introducing chirality.
Besides single-polarization operation, single-mode operation of the structure is ensured by high leakage loss of all the other higher-order modes.
By optimizing the structure, an ultra-wide single-circular-polarization operation range from 0.5 μm to 1.67 μm for chiral PCF can be realized with moderate chirality strength.
The simulation demonstrates that the chiral photonic crystal fiber compared to its achiral counterpart possesses another single-circular-polarization operation range, which is located in the short-wavelength region.
Each wavelength only transmits a single polarization in the wavelength-dependent polarization absorber, and the loss of unwanted polarized mode is more than 95 dB/cm.
By contrast, the accuracy is relatively low for the method of using single polarization sensor.
Among these, data obtained in (1) Stripmap Ultra-Fine mode with single polarization (2) high-sensitive dual model polarization (HH and HV) and (3) Fine mode full/dual polarization (HH and HV) were used for further investigation.
From the numerical analysis it is shown that single-polarization single-mode operation wavelength region can be tuned by adjusting the diameters of two defect air holes.
The single-polarization single-mode operation region of the fiber is achieved in a certain wavelength range with low confinement loss include the wavelength of 1.55 μm.
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