Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Article comprising an optional waveguide tap










Image Number 5 for United States Patent #6002822.

A dispersive optical waveguide tap comprises a blazed refractive index grating in the core of the waveguide, coupling means, focusing means and utilization means. The grating is selected such that guided mode light of predetermined wavelength will, in the absence of the coupling means, be directed into one or more cladding modes of the waveguide. The presence of the coupling means, in optical co-operation with the waveguide, changes the guiding conditions such that the cladding modes are substantially eliminated from a portion of the waveguide that includes the cladding, whereby the grating directs the guided mode light into one or more radiation modes. The blaze angle typically is .ltoreq.15.degree.. The focusing means serve to bring the radiation mode light substantially to a focus in at least one dimension, the focal point (or line) depending on the wavelength of the light. The utilization means exemplarily comprise an array of photodetectors, and the coupling means exemplarily comprise an appropriately shaped glass member and index matching means. Dispersive waveguide taps are advantageously used in WDM optical communication systems, e.g., to provide status information (e.g., channel wavelength, channel power, including presence or absence of a channel) to, e.g., a system maintenance unit. The status information facilitates maintenance of operating conditions by conventional feedback control. Any optical element that can bring the tapped radiation to a focus on the utilization means can serve as a focusing element. Exemplary focusing elements are optical lenses (cylindrical or non-cylindrical), diffraction gratings, volume gratings (holograms), and combinations thereof.








 
 
  Recently Added Patents
System and method to obtain signal acquisition assistance data
Electric power supply system and electric power supply system for motor vehicle
Provision of downlink packet access services to user equipment in spread spectrum communication network
Method and system for reciprocal mixing cancellation of wideband modulated blockers
Bath
System and method for multi-threaded MIMO OFDM channel equalizer
Auto-aligning spectroscopy system
  Randomly Featured Patents
Molecules of the AIP-related protein family and uses thereof
Golf chipping game apparatus
Method and/or apparatus for stabilizing the frequency of digitally synthesized waveforms
Semiconductor device and manufacturing method therefor
Faucet handle
Device for attaching one-way pouring nozzle
Method of measuring flexure value of wire electrode
Light expanding system for producing a linear or planar light beam from a point-like light source
Memory and method for charging a word line thereof
Method and system for transmitting authentication context information