The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 2000
Filed:
Dec. 04, 1997
Applicant:
Inventor:
John Kenneth Severn, Totnes, GB;
Assignee:
Nortel Networks Limited, Montreal, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ; H04B / ;
U.S. Cl.
CPC ...
359110 ; 359177 ; 385 48 ;
Abstract
An optical arrangement for full duplexed PON outstation transceivers (single fibber operation) which improves control of optical output power during marshalling by reducing the light level at which closed loop control can be used. The arrangement uses a beam-expanded region incorporating a bulk-optics beam-splitter with a reflective field stop that will tap a higher proportion of the basestation transmitter power when it is operating below lasing threshold and hence has a larger beam size than when operating above threshold.