The realism of an ocular prosthesis is limited by the immobility of the pupil. Our method to solve this problem is to use a
liquid crystal display (LCD) to control the pupil size as a function of the ambient light. This study demonstrates the first
LCD to our knowledge surviving the ocular prosthetic manufacturing steps. The dynamic pupil is controlled by a novel,
entirely autonomous and self-powered passive electronic circuit using photodiodes in a high voltage configuration.
Future work for a complete prosthesis with a dynamic pupil is discussed. Finally, a standard device for the mass
production of ocular prostheses is presented.
A novel Mach-Zehnder interferometer based on a multimode fiber combined with a twin-core fiber is
proposed. The section of twin-core fiber is spliced between a section of multimode fiber and a single mode
fiber. The curvature induced wavelength shifts on the interference fringes is experimentally monitored. A
blue shift is observed. This device is simple to fabricate, and is used as a bend sensor with good sensitivity.
Complex concatenated channel waveguides and multimode interference devices have been fabricated by laser ablation of
silica-on-silicon substrates for the first time to our knowledge. The technique is based on a tightly focused carbon
dioxide laser beam that modifies the refractive index of the area sorrounding the optical waveguide; the process is fast (a
few seconds) without any subsequent mechanical or chemical treatment, and the writing speed is about 500 times faster
than with UV or femtosecond writing. The results are encouraging for prototyping for the development of an optical sixport
device, the equivalent of the widely known microwave technique for amplitude and phase measurements.
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