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
Illumination apparatus
Establishing a social network
Liposomal nanoparticles and other formulations of fenretinide for use in therapy and drug delivery
Semiconductor device
Assay for the diagnosis of flaviviral infection using antibodies with high affinity for NS1 protein of flavivirusi in hexameric form
Block copolymer nanoparticle compositions
Dynamic trunk distribution on egress
  Randomly Featured Patents
Magnetic tape recording and reproducing machines
Dynamic credit card with magnetic stripe and embedded encoder and methods for using the same to provide a copy-proof credit card
Packaging container and method of manufacturing the same
Flying disk game
Both-side recording apparatus and control apparatus for controlling the same
Process for determining the stability of asphaltenes in live oil
Protection/restoration of MPLS networks
Hybrid maize plant and seed 38P05
Image processing apparatus, image processing method and recording medium for storing program to execute the method
Internal mix air atomizing spray nozzle