Method of reducing insertion loss in a transition region between a plurality of input or output waveguides to a free space coupler region
AssigneeInfinera Corporation
InventorsCharles Joyner, Mark Missey, Radhakrishnan Nagarajan, Fred Kish
Life of this patent
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Abstract
A method for reducing insertion loss in a transition region between a plurality of input or output waveguides to a free space coupler region in a photonic integrated circuit (PIC) includes the steps of forming a passivation layer over the waveguides and region and forming the passivation overlayer such that it monotonically increases in thickness through the transition region to the free space coupler region.
Claims5
A method of reducing insertion loss in a transition region between a plurality of input or output ridge waveguides coupled to and terminating at a free space coupler region comprising the steps of:
- forming a first dielectric layer over the waveguides and free space coupler region;
- and
- carrying out the formation of the first dielectric layer such that the first dielectric layer monotonically increases in cross-sectional thickness along a length of the ridge waveguides to their termini at the free space coupler region.
Dependencies are inferred from the claim text.