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










Image Number 14 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
Thin film switch and press key/keyboard using the same
Managing personal information on a network
Methods and apparatus for monitoring communication through identification of priority-ranked keywords
System and method for distributing emergency data messages to public safety answering points in a balanced manner
Deflection device for a scanner with Lissajous scanning
Method and apparatus for transcoding and transrating in distributed video systems
Analysis device and an analysis apparatus using the analysis device
  Randomly Featured Patents
Substrate for manufacturing cutting elements
Refuse collecting device
Proportional mix system and method for applying a thixotropic de-icing fluid to an aircraft
Device for holding articles
Cross-technology coverage mapping system and method for modulating scanning behavior of a wireless user equipment (UE) device
Producing SOI structure using high-purity ion shower
Sequestered imaging agents
Liquid crystal cell having a glass fiber frame
Continuous tone color imaging using laser or light emitting diode sources
Wall mounted adhesive melter