Optical equalizer having variable transmittance versus wavelengt

Details Optical equalizer having variable transmittance versus wavelengt Optical equalizer having variable transmittance versus wavelengt

1997-01-17

1998-09-08

Ngo, John

Optical waveguides

Accessories

Attenuator

385 37, 385 25, 385 42, 359889, G02B 626

Patent

active

058057595

ABSTRACT:
An apparatus, such as an optical equalizer, having variable wavelength characteristics. More specifically, the apparatus attenuates an input light, and includes a beam expander, a beam condenser and an attenuator positioned between the beam expander and the beam condenser. The beam expander converts the input light into a spectral beam propagating in a first direction and having wavelength components spatially separated in a second direction perpendicular to the first direction. The attenuator intersects the spectral beam and has a planer distribution of transmittance so that the spectral beam passes through the attenuator and is attenuated in accordance with the planer distribution of transmittance. The beam expander converts the attenuated spectral beam into an output light. The attenuator is movable in a plane which is not parallel to the first direction. For example, the attenuator can be movable in a plane which is substantially perpendicular to the first direction. Further, the attenuator can include a plurality of individual attenuators, wherein each individual attenuator intersects the spectral beam and has a corresponding planer distribution of transmittance for attenuating the spectral beam in accordance with the corresponding planer distribution of transmittance.

REFERENCES:
patent: 4197008 (1980-04-01), Pinnow et al.
patent: 4575193 (1986-03-01), Greivenkamp, Jr.
patent: 5317661 (1994-05-01), Szentesi et al.
patent: 5481381 (1996-01-01), Fujimoto

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