Quasi-hitless tunable add-drop filters
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 30, 2004
Grant Date -
N/A
app pub date -
Nov 1, 2002
filing date -
Nov 1, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In tunable systems, during a tuning cycle, express channels or wavelengths are dropped as the system sweeps through its free spectral range (FSR) before stopping at the desired wavelength to be dropped. This is disadvantageous as the data information in the express wavelengths suffers a hit or momentary increase in bit error rate (BER). Techniques for eliminating or at least minimizing interference to those channels or wavelengths are disclosed. According to one aspect of the present invention, the wavelength selection to be dropped is done 'off-line' and does not affect the express channels. An optical reference source is used to set up and tune a drop filter. Once the filter is set to the appropriate dropping wavelength, a secondary filter is scanned to cause the channels to be shunted to the drop filter. If the wavelength of a signal and the drop filter matches, the signal is dropped. If the wavelength of the signal and the drop filter wavelength do not matches, the signal passes and is recombined with the other express channels.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully