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
Organic light-emitting display and method of manufacturing the same
Double diffused metal oxide semiconductor device and manufacturing method thereof
Memory with separate read and write paths
Dyes and methods of marking biological material
Gestures for presentation of different views of a system diagram
Client-managed group communication sessions within a wireless communications system
Method and apparatus for executing load distributed printing
  Randomly Featured Patents
Linkage drive mechanism for a reciprocating tool
Pledget-handling system and method for delivering hemostasis promoting material to a blood vessel puncture site by fluid pressure
Data compression and decompression using relative and absolute delta values
Computer system with selectively available immutable boot block code
Fishing lure-and-line snap swivel
Navigation system for transmitting real-time information allowing instant judgement of next action
Device for measuring pressure comprising a membrane moulded into a cassette
Distributed network traffic load balancing technique implemented without gateway router
Recessive plant viral resistance results from mutations in translation initiation factor eIF4E
Shoe outsole