Lens system to enhance optical coupling efficiency of collimated beam to optical waveguide
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United States of America Patent
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Feb 6, 2018
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Oct 24, 2014
filing date -
Oct 24, 2014
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Abstract
An optical coupling system to couple a collimated beam with a waveguide made of semiconductor materials is disclosed. The waveguide is implemented in an optical modulator and/or an optical hybrid, and has a core with a restricted cross section because of the enhanced refractive index of the semiconductor materials. The collimated beam is focused on the core by the two-lens system including first and second lenses. The first lens, having a focal length shorter than a focal length of the second lens, is first aligned with the core, then, the second lens is aligned with the core as compensating deviations of the first lens induced during the fixation thereof.
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