Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Optical apparatus using wavelength selective photocoupler










Image Number 4 for United States Patent #5140149.

The present invention relates to optical apparatus such as a photosensor, a semiconductor laser, an optical amplifier in which a wavelength selective photocoupler is used so as to couple two waveguides through a diffraction grating.A photosensor which is one of the optical apparatus according to the present invention comprises a substrate, a first waveguide layer formed on the substrate, a second waveguide layer formed on the first waveguide layer to be stacked in a direction of thickness and which has a guided mode difference from that of the first waveguide layer, a diffraction grating formed on an overlapping region of the guided modes of the first and second waveguide layers and which couples light components of a specific wavelength range of light propagating through the first waveguide layer to the second waveguide layer, a light absorption layer for absorbing at least some light components of the light components coupled to the second waveguide layer, and an electrode for converting the light components absorbed by the light absorption layer into an electrical signal and outputting the electrical signal.








 
 
  Recently Added Patents
Reducing voltage stress in a flyback converter design
SONOS stack with split nitride memory layer
Vehicle lamp component
Method, apparatus and article for detection of transponder tagged objects, for example during surgery
Method of sheet alignment and method of post-processing comprising the same and method of image formation
Protein purification
Hanger
  Randomly Featured Patents
Transfer system
Medical line anchoring system
Coupler for plumbing fixtures
Center-pull type calliper brake for a bicycle
High-density low-power circuit for sustaining a precharge level
Molecular jet growth of carbon nanotubes and dense vertically aligned nanotube arrays
Sulfur-containing animal-feed additives
Method for supporting coexistence considering while subchannel allocation in a broadband wireless access system
Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomena
Inserter for a rotatable storage structure