Optical coupling with passive alignment
An optical coupling joins an optical component (9), e.g. a semiconductor optical amplifier, and a waveguide, such as a silica on silicon waveguide. The waveguide has a core (3) and cladding layer (4) of a first material (SiO2) supported on a first substrate (1) of a second material (Si). The core (3...
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Zusammenfassung: | An optical coupling joins an optical component (9), e.g. a semiconductor optical amplifier, and a waveguide, such as a silica on silicon waveguide. The waveguide has a core (3) and cladding layer (4) of a first material (SiO2) supported on a first substrate (1) of a second material (Si). The core (3) is spaced from the first substrate (1) by a known distance and recesses (5) are formed through the cladding layer (4) to the first substrate (1) and the optical component (9) has or is mounted on a second substrate (7) which has projections (8) of known length, each projection (8) being located in contact with the first substrate (1) within a respective recess (5) so that the optical component (9) is positioned in a known location relative to the first substrate (1) and hence to the waveguide core (3). Projections (8) and interface (6) of first substrate (1) are preferably micro-machined to sub-micron accuracy to provide good alignment of the component and waveguide. |
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