Abstract:
The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.
Abstract:
A wavelength tunable laser which includes a first mirror, a diffraction grating to diffract a laser beam into a plurality of diffracted laser beams, at least one feedback waveguide, at least one second mirror. Each feedback waveguide precedes one of the second mirrors, and a phase detector to detect an error in a wavelength of a received laser beam with respect to a desired wavelength.
Abstract:
An apparatus for coupling light between input and output waveguides includes a substrate, an input waveguide disposed on the substrate and comprising a first optical axis, and an output waveguide disposed on the substrate and comprising a second optical axis vertically offset from the first optical axis. A superlens is disposed on the substrate between the input waveguide and the output waveguide. The superlens has a middle optical axis and comprises a vertically graded refractive index film having a refractive index distribution n(y), where y is a vertical direction substantially perpendicular to the middle optical axis.
Abstract:
An electronic-integration compatible photonic integrated circuit (EIC-PIC) for achieving high-performance computing and signal processing is provided. The electronic-integration compatible photonic integrated circuit comprises a plurality of electronic circuit structures and a plurality of photonic circuit structures. The electronic and photonic circuit structures are integrated by a process referred to as monolithic integration. An electronic circuit structure includes one or more electronic devices and a photonic circuit structure includes one or more photonic devices. The integration steps of electronic and photonic devices are further inserted into standard CMOS process. The photonic circuit structures and the electronic circuit structures are integrated to form the electronic-integration compatible photonic integrated circuit device.
Abstract:
The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.
Abstract:
According to embodiments of the present invention, a lens comprising a refractive index profile configured such that rays of light propagating in the lens form an at least substantially plane wavefront at an at least substantially vertical plane of the lens, is provided. The profile is configured to vary in an at least substantially bell curve shape along a radial direction of the lens. The lens includes a plurality of layers configured to generate the profile, wherein each layer of the plurality of layers comprises at least a first film and a second film arranged one above the other.
Abstract:
According to embodiments of the present invention, a lens comprising a refractive index profile configured such that rays of light propagating in the lens form an at least substantially plane wavefront at an at least substantially vertical plane of the lens, is provided. The profile is configured to vary in an at least substantially bell curve shape along a radial direction of the lens. The lens includes a plurality of layers configured to generate the profile, wherein each layer of the plurality of layers comprises at least a first film and a second film arranged one above the other.
Abstract:
The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.
Abstract:
An optical tip for a Near-field Scanning Optical Microscope (NSOM) is provided. The optical tip includes a waveguide with a semiconductor or metal core and a cladding. The refractive-index-square-ratio contrast between the core and the cladding is at least 0.3. The optical tip may also include a light detector and a light source. The waveguide, the light source and the light detector may be integrated to form a single chip.
Abstract:
The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.