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:
Apr. 30, 2002
Filed:
Sep. 22, 1997
Applicant:
Inventor:
Andrew D Ellis, Suffolk, GB;
Assignee:
British Telecommunications public limited company, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/004 ; H04J 1/408 ;
U.S. Cl.
CPC ...
H04B 1/004 ; H04J 1/408 ;
Abstract
A number of optically cascaded electroabsorption modulators (EAM) are electrically biased to provide an optical time division multiplexed (OTDM) signal. The optical input into the first of the cascaded EAMs is a substantially cw light beam In operation, each EAM is normally biased to allow transmission of light, and data is represented by blocking transmission of light for a short period, thereby imposing dark pulses onto the light. Thus, light between dark pulses remains unperturbed and is available for further modulation by subsequent EAMs. In this way, each EAM can be arranged to rpovide a single data channel of the overall OTDM signal.