Circuits and methods for achieving high signal-to-noise ratios and obtaining stabilized laser signals in dense wavelength division multiplexing systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 2003
Grant Date -
N/A
app pub date -
Oct 18, 1999
filing date -
Oct 18, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A circuit for increasing the signal-to-noise ratio in an optical communication system and for stabilizing a laser wavelength. The circuit includes an impedance element disposed in parallel relation with the input capacitance of the circuit to increase the input capacitance for filtering out noise in the circuit to thereby achieve a high signal-to-noise ratio. The bandwidth of the noise signal is kept low to achieve high signal-to-noise ratios and efficient wavelength stabilization. By operating at low bandwidths, the input capacitance of the circuit does not dominate the shunt voltage and associated current due to the noise; rather, a feedback resistance associated with an operational amplifier dominates the magnitude of the noise current. Thus, the input capacitance can be increased without increasing noise current, which effectively filters the noise from the total current in the circuit and advantageously insures that the bandwidth of the noise is low and the signal-to-noise ratio of the circuit remains high.
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