Optical alignment of an optical subassembly to an optoelectronic device using pairs of alignment reflective surfaces
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United States of America Patent
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Jul 17, 2018
Grant Date -
Oct 19, 2017
app pub date -
Mar 15, 2017
filing date -
Mar 15, 2016
priority date (Note) -
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Abstract
Optical alignment of optical subassembly and optoelectronic device is achieved using an external source and an external receiver, passing optical signal through a passive waveguide in the optoelectronic device, via alignment reflective surface features provided on the optical subassembly. The optical subassembly is provided with a first alignment reflective surface directing alignment signal from the source to a grating coupler at the input of the waveguide, and a second alignment reflective surface directing to the receiver the alignment signal directed from a grating coupler at the output of the waveguide after the alignment signal has been transmitted from the input to the output through the waveguide. By adjusting the relative position between the optical subassembly and the optoelectronic device, and detecting the maximum optical power of the alignment signal reflected from the second alignment reflective surface, the position of best optical alignment of the optical subassembly and the optoelectronic device can be determined.
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