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:
Dec. 19, 2017
Filed:
Apr. 30, 2013
Bae Systems Plc, London, GB;
Andrew James Smith, Chelmsford, GB;
Mohammed Nawaz, Chelmsford, GB;
BAE SYSTEMS plc, London, GB;
Abstract
Methods and apparatus for controlling a bias voltage () supplied to an optical modulator that comprises a biasable component configurable to be biased by application of the bias voltage (), the method comprising: providing a target for the modulator output power; applying, to the biasable component, a bias voltage () that biases the biasable component so that the output power is within a pre-defined range of the target; monitoring the output power and, if the output power of the modulator is determined to be outside the pre-defined range, varying the value of the bias voltage () to bring the output power back within the pre-defined range; and monitoring the optical input to the modulator and, if it has been disabled, maintaining the bias voltage () at its current level for a pre-determined length of time that is dependent upon how long the modulator has been operating at quadrature.