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:
Mar. 22, 2016
Filed:
Apr. 30, 2013
Bae Systems Plc, London, GB;
Andrew James Smith, Chelmsford, GB;
Mohammed Nawaz, Chelmsford, GB;
Simon Charles Giles, Chelmsford, GB;
BAE SYSTEMS Plc, London, GB;
Abstract
Methods and apparatus for finding a bias voltage () corresponding to a quadrature point of an optical modulator, the modulator comprising a biasable component which is configurable to be biased by application of the bias voltage () such that the modulator operates at quadrature, the method comprising: providing a target for the output power of the modulator which corresponds to quadrature; applying, to the biasable component, a bias voltage () having an initial value; thereafter, finding a value for the bias voltage () that biases the biasable component such that the output power of the modulator is within a pre-defined range of the target by, starting at the initial value, alternately increasing and decreasing (or decreasing and increasing) the bias voltage () with gradually increasing amplitude; and identifying the found value for the bias voltage () as a bias voltage corresponding to a quadrature point of the optical modulator.