View source for 20240045146. Grating coupler with high efficiency simplified abstract (Apple Inc.)

=Grating coupler with high efficiency=


==Organization Name==

[[:Category:Apple Inc.|Apple Inc.]]


[[Category:Apple Inc.]]

==Inventor(s)==

[[:Category:Nurul Taimur Islam of Cupertino CA (US)|Nurul Taimur Islam of Cupertino CA (US)]][[Category:Nurul Taimur Islam of Cupertino CA (US)]]

[[:Category:Helen H. Liang of Los Gatos CA (US)|Helen H. Liang of Los Gatos CA (US)]][[Category:Helen H. Liang of Los Gatos CA (US)]]

[[:Category:Malcolm J. Northcott of Santa Cruz CA (US)|Malcolm J. Northcott of Santa Cruz CA (US)]][[Category:Malcolm J. Northcott of Santa Cruz CA (US)]]

[[:Category:Ariel Lipson of Tel Aviv (IL)|Ariel Lipson of Tel Aviv (IL)]][[Category:Ariel Lipson of Tel Aviv (IL)]]

==Grating coupler with high efficiency - A simplified explanation of the abstract==


This abstract first appeared for US patent application 20240045146 titled 'Grating coupler with high efficiency

==Simplified Explanation==

The abstract describes an optical coupling device that consists of multiple layers, including waveguide layers and a dielectric intermediate layer. The device utilizes diffraction gratings to manipulate the propagation of light at specific wavelengths and coupling angles.

* The device includes a first waveguide layer made of a semiconductor material, placed over a dielectric substrate layer.
* A dielectric intermediate layer is positioned above the first waveguide layer.
* A second waveguide layer, made of a different semiconductor material, is placed over the dielectric intermediate layer and patterned to define a waveguide.
* A first grating in the second waveguide layer diffracts light of a specific wavelength from the waveguide into a designated diffraction order at a given coupling angle.
* A portion of the diffracted light exits the device, while another portion is diffracted into the intermediate dielectric layer in a conjugate diffraction order.
* A second grating in the first waveguide layer further diffracts the second portion of light into a second diffraction order, allowing it to propagate out of the device at the given coupling angle.

Potential applications of this technology:

* Optical communication systems
* Photonic integrated circuits
* Optical sensors
* Optical computing

Problems solved by this technology:

* Efficient coupling of light between different waveguide layers
* Precise control of light propagation and diffraction
* Reduction of signal loss and crosstalk in optical devices

Benefits of this technology:

* Improved optical coupling efficiency
* Enhanced performance and functionality of optical devices
* Compact and integrated design for space-saving applications
* Increased data transmission rates and bandwidth


==Original Abstract Submitted==

an optical coupling device includes a first waveguide layer, including a first semiconductor material, which is disposed over a dielectric substrate layer. a dielectric intermediate layer overlies the first waveguide layer. a second waveguide layer, which includes a different, second semiconductor material, is disposed over the dielectric intermediate layer and is patterned to define a waveguide. a first grating in the second waveguide layer diffracts light of a given wavelength from the waveguide into a specified diffraction order at a given coupling angle, whereby a first fraction of the light propagates out of the device while a second fraction of the light is diffracted into the intermediate dielectric layer in a conjugate diffraction order. a second grating in the first waveguide layer diffracts the second fraction of the light into a second diffraction order, propagating out of the device at the given coupling angle.



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