Optical receiver particularly useful for a multi-wavelength receiver array
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 23, 2001
Grant Date -
N/A
app pub date -
Jan 21, 1998
filing date -
Jan 28, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-wavelength optical receiver including multiple photodetectors receiving different ones of a multi-wavelength signal. For each wavelength-dedicated photodetector, a separate electronic receiver circuitry is provided including a current-to-voltage converting input transistor and an emitter-follower output transistor arranged as an operational amplifier with a feedback resistor. The circuit is improved by a cascode connection to the input transistor, by a reference to an analog ground rather than to a power supply line in both the photodiode and the cascode transistor, by the addition of capacitive shunts and a clamping transistor parallel to the feedback resistor in the feedback loop from the output transistor to the input transistor, by including positive and negative power supplies for the input and the output stages, by including multiple emitter followers in the output, by use of a differential second stage referenced to the analog ground, and by use of an output matching network that makes use of parasitic packaging inductances. Thereby, noise is reduce and inter-channel interference is minimized.
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