Article

Polarization-maintaining optical microfiber

Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK.
Optics Letters (Impact Factor: 3.29). 06/2010; 35(12):2034-6. DOI: 10.1364/OL.35.002034
Source: PubMed

ABSTRACT

We have successfully demonstrated a polarization-maintaining (PM) fused silica microfiber by adiabatically tapering a conventional PM fiber. Compared to standard single-mode microfibers, the proposed PM microfibers exhibit robust polarization, preserving characteristics under the presence of external perturbations, such as bending. A polarization-extinction ratio of 16 dB is typically obtained through the device with a corresponding excess loss of 0.2 dB.

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    • "It would require a perturbation capable for making a significant change in the velocity of the transmitted light along the fast and slow axes. The increase of the applied stress to the core leads to an increase of the difference in the propagation constant (light velocity) between the two axes and the increase of the birefringence [1] [2] [3] [4]. When light is launched into a PM fiber with a linear component along each of its two birefringent axes, the difference in velocities of these two components causes the resultant polarization state to vary along the length of the fiber. "

    Full-text · Dataset · Aug 2014
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    • "It would require a perturbation capable for making a significant change in the velocity of the transmitted light along the fast and slow axes. The increase of the applied stress to the core leads to an increase of the difference in the propagation constant (light velocity) between the two axes and the increase of the birefringence [1] [2] [3] [4]. When light is launched into a PM fiber with a linear component along each of its two birefringent axes, the difference in velocities of these two components causes the resultant polarization state to vary along the length of the fiber. "
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    ABSTRACT: Abstract In this paper, the refractive indices distributions on the two birefringent axes of polarization maintaining (PM) PANDA type optical fiber are reconstructed. The local refraction of the incident rays crossing the PM optical fiber is considered. Off-axis digital holographic interferometric phase shifting arrangement is employed in this investigation. The recorded mutual phase shifted holograms, starts with 0° with steps of π/4, are combined and numerically reconstructed in the image plane to obtain the optical interference phase map. Consequently, the optical phase differences due to the PM optical fiber are extracted after unwrapping and background subtraction of the enhanced optical interference phase map. The birefringence and the beat length in the two directions, fast and slow axes of PM optical fiber, of polarizations in the core region are calculated. This holographic technique and the advanced analysis of the phase shifting permit the calculation of the 3D refractive index distributions for PM PANDA optical fiber.
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    • "It is a fiberized slot waveguide [10] and the light field can be enhanced and confined in the nanometer-wide low index slot. Simulation results show that the birefringence reaches a high level of 4 , which is much higher than previous works [7]–[9]. By controlling the shape of the slot, light can be confined in the slot or not. "
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    ABSTRACT: We propose a possible approach to realize a highly birefringent slot microfiber by postprocessing a circular microfiber (CMF). The shape can be fabricated with very high repeatability, reliability, and accuracy. Light field can be enhanced and confined in the nanometer-wide low index slot, and the birefringence achieves as high as 4 × 10<sup>-2</sup>. The slot-microfiber has the advantages both of a microfiber and a slot waveguide. It is perfect for miniature fiberized polarization manipulation devices and its unique geometry can also greatly enhance the refractive index sensitivity (nearly ten times higher than that of CMFs) for evanescent-field-based gas sensors.
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