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:
Aug. 23, 2005
Filed:
Jan. 26, 2004
Roger W Brown, Nottingham, GB;
Earl a Dennis, Nottingham, GB;
Darren W Vass, Nottingham, GB;
Graham Butler, Chilwell Nottingham, GB;
Michael J Leach, Awsworth Nottingham, GB;
Roger W Brown, Nottingham, GB;
Earl A Dennis, Nottingham, GB;
Darren W Vass, Nottingham, GB;
Graham Butler, Chilwell Nottingham, GB;
Michael J Leach, Awsworth Nottingham, GB;
Marconi UK International Property Ltd., Coventry, GB;
Abstract
A method of generating a pulse width modulated (PWM) signal receives digital demand data comprising at least one more significant bit and at least one less significant bit. The PWM signal comprises a sequence of one or more frames, each frame comprising a plurality of PWM pulses whose duty cycle is substantially governed by the at least one more significant bit. At least one of its PWM pulses is selected to have its duty cycle modified in response to the at least one less significant bit. Each of the at least one less significant bit uniquely mapping onto the at least one selected PWM pulse of the frame. An apparatus operable according to this method includes an optical attenuator whose optical attenuation is dependent upon its temperature and in which the temperature and, hence, the attenuation is controlled using the above PWM signal.
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