Abstract:
A packaged fiber-coupled optical device comprises an alignment housing with a fiber retainer, optical fiber segment(s), and optical component(s) (on substrate(s) with fiber groove(s)). Upon assembly the protruding end(s) of the fiber segment(s) is/are positioned against the fiber retainer, and the fiber groove(s) is/are aligned with the protruding end(s) of the fiber segment(s). The fiber retainer urges the protruding end(s) of the fiber segment(s) into the fiber groove(s). The fiber groove(s) position the protruding end(s) of the optical fiber(s) seated therein for optical coupling with optical component(s). The alignment housing and/or a fiber subassembly may be configured for engaging a mating fiber-optic connector.
Abstract:
A grating-stabilized semiconductor laser comprises a semiconductor laser gain medium, an integrated low-index waveguide, and a waveguide grating segment providing optical feedback for laser oscillation. The laser may be adapted for multi-mode or single-mode operation. A multiple-mode laser may oscillate with reduced power and/or wavelength fluctuations associated with longitudinal mode wavelength shifts, relative to Fabry-Perot lasers lacking gratings. A single-mode laser may include a compensator, wavelength reference, and detector for generating an error signal, and a feedback mechanism for controlling the compensator for maintaining the laser wavelength locked to the reference. The laser may include means for altering, enhancing, tuning, and/or stabilizing the waveguide grating reflectivity spectral profile. The laser may be adapted for optical transverse-coupling to another waveguide.
Abstract:
An apparatus comprises: a substrate; a photodetector formed on an area of a surface of the substrate; an electrical contact formed on a portion of the photodetector; and a reflector formed over a portion of the photodetector distinct from the portion of the photodetector having the electrical contact formed thereon. The substrate, the photodetector, and the reflector are arranged so that an optical signal to be detected is incident on the photodetector from within the substrate, and at least a portion of the optical signal incident on the photodetector and transmitted thereby on a first pass is reflected by the reflector to propagate through the photodetector for a second pass.
Abstract:
An optical component may comprise a horizontal member (101) with two side walls (108) and a substantially transparent end wall (100) protruding from the horizontal member. The end wall, side walls and horizontal member may partially enclose an interior volume (106), and optical functionality is imparted in any suitable manner on at least a portion of the end wall. An optical assembly may comprise such an optical component mounted on a waveguide substrate (200) along with a planar waveguide (250) and a second waveguide (210, 230), which are end-coupled by either reflection from the optical component end wall or transmission through the optical component end wall. An end portion of a planar waveguide may be received within the interior volume of the mounted component. Proper positioning of the optical component relative to the waveguides may be facilitated by alignment surfaces and/or alignment marks (124, 224) on the component and/or waveguide substrate.
Abstract:
An optical device assembly comprises a substrate with a component and fiber groove thereon. A segment of optical fiber is engaged with the fiber groove, which positions the fiber segment for optical coupling with a component on the substrate. A fiber retainer maintains the fiber segment in engagement with the groove. The fiber retainer may be secured to the substrate with adhesive means. Recessed regions formed on the substrate/retainer are filled with adhesive means, forming retaining members. Alternatively, the fiber retainer comprises a resilient member engaged with the device substrate and biased so as to urge the fiber segment into the groove. The resilient member may be variously configured and/or adapted for enhancing engagement of the fiber segment with the fiber groove. Either embodiment may include a housing, which may be variously configured and/or adapted for engaging a mating fiber-optic connector, providing fiber pigtail(s), mechanical splicing, and so forth.
Abstract:
A multiple-core planar optical waveguide comprises: a substantially planar waveguide substrate (802); a lower waveguide core (811); an upper waveguide core (812); lower cladding (820a) between the substrate (802) and the lower waveguide core (811); and upper cladding (820c) aobe the upper waveguide core (812). At least a portion the upper waveguide (812) core is positioned above and substantially parallel to at least a portion of the lower waveguide core (811). The lower and upper claddings have refractive indices less than refractive indices of the lower and upper waveguide cores. The width of the lower waveguide core is substantially larger than its thickness along at least a portion of its length, and is substantially flat along that portion of its length, thereby yielding a substantially flat surface for forming at least a portion of the upper waveguide core (812).
Abstract:
An optical apparatus comprises a semiconductor optical device waveguide (100) and an integrated end-coupled waveguide (200) formed on the semiconductor substrate (102). The integrated waveguide (200) may comprise material differing from those of the device waveguide (100) and the substrate (102). Spatially selective material processing may be employed for first forming the optical device waveguide (100) on the substrate (102), and for subsequently depositing and forming the integrated end-coupled waveguide (200) on the substrate (102). Spatially selective material processing enables accurate spatial mode matching and transverse alignment of the waveguides. Multiple device waveguides and corresponding integrated end-coupled waveguides may be fabricated concurrently on a common substrate on a wafer scale. The integrated end-coupled waveguide (200) may be adapted for fulfilling one or more functions, and the device waveguide (100), integrated waveguide (200) and/or spatially selective material processing steps may be adapted for achieving the needed/desired degree of end-coupling.
Abstract:
An optical apparatus comprises a substrate (921), first and second transmission optical elements (920a, 920b) on the substrate, and an optical component (300) and focusing optical elements (220a, b) on the substrate between the transmission elements.