Abstract:
An optical device comprising a waveguide with a heating element (25) thereon that is formed on a silicon substrate (20) is disclosed. The waveguide (10) is formed on a region of porous silicon (15) formed in the silicon substrate. The porous silicon region provides greater resistance to the flow of heat than the silicon substrate on which the device is formed. Optionally, the porous silicon region also provides greater resistance to the flow of heat than the waveguide.
Abstract:
In a time-division-multiplex system, a relatively high-rate optical signal stream comprising multiple interleaved signal sequences is applied to one end of an elongated waveguide that includes multiple photodetectors disposed along the longitudinal extent of the waveguide. Probe pulses at a relatively low rate are applied to the other end of the waveguide in a synchronized fashion to cause two-photon non-linear absorption in successive respective photodetectors as each propagating probe pulse overlaps successive different signals of each sequence. In that way, electrical output signals are provided from each photodetector at the relatively low probe-pulse rate.
Abstract:
A process for fabricating a silica-based optical device on a silicon substrate (15) is disclosed. The device has a cladding (12) formed in a silicon substrate. The device also has an active region (10) and that active region is formed on the cladding. The cladding is fabricated by forming a region of porous silicon in the silicon substrate. The porous silicon is then oxidized and densified. After densification, the active region of the device is formed on the cladding.
Abstract:
In a planar optical waveguide amplifier according to our invention, a first and a second planar waveguide are in contact with each other, with the second planar waveguide comprising a rare earth doped planar waveguide. The second planar waveguide is tapered to facilitate substantially adiabatic coupling of electromagnetic radiation of a first wavelength, e.g., signal radiation of about 1.5µm, from the first planar waveguide to the second planar waveguide. Adiabatic coupling of pump radiation from the first to the second planar waveguide is also contemplated. The tapers typically have 100:1 or more length-to-thickness ratio. The planar optical waveguide amplifier is advantageously used in optical waveguide communication systems.
Abstract:
In accordance with a specific deposition/etching sequence, a multi-layer metallization system is formed on the non-planar top surface of a semiconductor wafer. In an electrophoretic deposition step, a conformal uniform-thickness layer of a resist material is then formed on the top surface of the metallization system. In turn, the layer of resist material is lithographically patterned to provide an etch-mask for defining features in the underlying metallization system.
Abstract:
In a time-division-multiplex system, a relatively high-rate optical signal stream comprising multiple interleaved signal sequences is applied to one end of an elongated waveguide that includes multiple photodetectors disposed along the longitudinal extent of the waveguide. Probe pulses at a relatively low rate are applied to the other end of the waveguide in a synchronized fashion to cause two-photon non-linear absorption in successive respective photodetectors as each propagating probe pulse overlaps successive different signals of each sequence. In that way, electrical output signals are provided from each photodetector at the relatively low probe-pulse rate.