Abstract:
An apparatus comprising an optical filter located on a substrate. The optical filter including an optical splitter configured to receive an input light and an interferometer having two waveguide arms having different optical path-lengths from each other. The waveguide arms configured to receive the input light from the optical splitter. At least a portion of one of the two waveguide arms has a narrower core width than a wider core width of the other waveguide arm. The waveguide arm with the longest waveguide portion having the narrower core width has the longest total physical path-length of the two waveguide arms. At least one of the two waveguide arms having a set of discrete waveguide portions, the discrete waveguide portions of the set being connected by optical switches which are configured to tunably select from a plurality of different physical path-lengths through the discrete waveguide portions of the at least one waveguide arm.
Abstract:
Polarization-insensitive, trichromatic resonant waveguide (RWG) optical filters can be used for super anaglyph stereoscopic vision. An RWG filter can be centered on three wavelengths (e.g., red, green, and blue wavelengths) and formed of a grating disposed on a waveguide that supports at least one propagation mode. The grating can be formed in or on the surface of the first waveguide with one- or two-dimensional periodicity. For example, the grating may have 2D tiling that is triangular, with each leg of the triangle having a length to a different wavelength. The RWG filter may be stacked on a second RWG filter with another grating formed in or on the surface of the second waveguide, with the second grating have a periodicity identical to that of the first grating, but rotated about the optical axis to filter both transverse electric (TE) and transverse magnetic (TM) polarizations.
Abstract:
Demultiplexing systems and methods are discussed which may be small and accurate without moving parts. In some cases, demultiplexing embodiments may include optical filter cavities that include filter baffles and support baffles which may be configured to minimize stray light signal detection and crosstalk. Some of the demultiplexing assembly embodiments may also be configured to efficiently detect U.V. light signals and at least partially compensate for variations in detector responsivity as a function of light signal wavelength.
Abstract:
A two-dimensional photonic crystal resonator apparatus (100, 300, 400) in which the power of light coupled out of the apparatus in one direction is greater than the power of light coupled out of the apparatus in the opposite direction The apparatus (100, 300, 400) has a photonic crystal slab waveguide structure (102, 302, 402) having a waveguide (110, 310) and a resonator (116, 316) in the vicinity of the waveguide (110, 310) such that light propagated through the waveguide (110, 310) is extracted from the waveguide (110, 310) through the resonator (116, 316) and is coupled out of the plane of the apparatus. The apparatus (100, 300, 400) has upper and lower cladding layers (404, 406) on the photonic crystal slab waveguide structure (102, 302, 402) having different indices of refraction, and the power of light coupled out of the apparatus in the direction of the cladding layer (404, 406) having the higher index of refraction is greater than the power of the light coupled out of the apparatus in the direction of the cladding layer (404, 406) having the lower index of refraction.
Abstract:
A photonic band gap micro-resonator device. The device comprises an array of regular elements in a surrounding matrix arranged in a grid. In at least one of a plurality of selected element positions an irregularity is presented in the form of two or more elements replacing a single regular element of the array.
Abstract:
The index of refraction of waveguide structures can be varied by altering carrier concentration. The waveguides (100, 102) preferably comprise semiconductors (106) like silicon that are substantially optically transmissive at certain wavelengths. Variation of the carrier density in these semiconductors may be effectuated by inducing an electric field within the semiconductor. For example, by applying a voltage (114) to electrodes (110) associated with the semiconductor. Variable control of the index of refraction may be used to implement a variety of functionalites including, but not limited to, tunable waveguide gratings and resonant cavities, switchable couplers, modulators, and optical switches.
Abstract:
L'invention concerne un composant en optique intégrée comprenant dans un substrat (7) au moins un cœur (11) de guide optique et au moins une gaine optique (9), le cœur et la gaine étant indépendants l'un de l'autre dans le substrat, au moins une portion de ladite gaine entourant au moins une portion dudit cœur de façon à définir au moins une zone dite d'interaction (20) entre le cœur et la gaine, l'indice de réfraction de la gaine étant différent de l'indice de réfraction du substrat et inférieur à l'indice de réfraction du cœur au moins dans la partie de la gaine voisine du cœur et au moins dans la zone d'interaction, une onde lumineuse étant introduite dans la dite zone par le guide et/ou par la gaine. L'invention trouve des applications en particulier dans le domaine des télécommunications optiques pour réaliser par exemple un filtre spectrale ou spatial, ou encore un interféromètre de type Mach-Zehnder ou un capteur de température.
Abstract:
An optical device for filtering an optical signal is described. The optical filtering device comprises an optical input receiving the optical signal; an elongated waveguide connected to the input and having a modified transverse dimension to create a series of partially reflective segments having predetermined effective indices of refraction (neff) with a distribution within the waveguide to provide the filtering of the optical signal, wherein the segments are designed for single mode operation and wherein a reflected filtered output optical signal is generated, wherein the transverse dimension varies within a narrow range over which a transverse size of the mode remains close to its minimum value; an optical output connected to the waveguide for providing the filtered optical signal.