Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2005-07-12
2005-07-12
Palmer, Phan T. H. (Department: 2874)
Optical waveguides
Accessories
Attenuator
C385S002000, C385S014000, C385S131000
Reexamination Certificate
active
06917748
ABSTRACT:
The intensity of signals in optical networks can be controlled using a variable optical attenuator (VOA). The present invention is a VOA that is particularly well suited for optical networks, for example to provide channel-by-channel normalization of gain control of wavelength division multiplexed signals. The inventive VOA includes a waveguide having an electro-optical material and electrodes that produce an electric field within the electro-optical material when a voltage difference is applied to the electrodes. The electro-optical material can either be a substrate or can be a layer deposited on a substrate. In an alternative embodiment, a polarization independent VOA is formed from a waveguide that includes two, end-to-end waveguides. In one embodiment, a 90 degree polarization rotator is provided between the two waveguides. In another embodiment, each of the two waveguides has a different electro-optical material selected to selectively pass one of two 90 degree polarizations.
REFERENCES:
patent: 6441955 (2002-08-01), Takatsu et al.
patent: 6546163 (2003-04-01), Thackara
patent: 6553175 (2003-04-01), Jaspan
Aoki Shigenori
Glebov Alexei
Fujitsu Limited
Palmer Phan T. H.
Sheppard Mullin Richter & Hampton LLP
LandOfFree
Variable optical attenuator on an electro-optical layer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable optical attenuator on an electro-optical layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable optical attenuator on an electro-optical layer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3421365