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:
Oct. 27, 2015
Filed:
Oct. 03, 2013
Meredith N. Hutchinson, Washington, DC (US);
Joseph M. Singley, Elysburg, PA (US);
Vincent J Urick, Alexandria, VA (US);
Jason D. Mckinney, Bowie, MD (US);
Keith J Williams, Dunkirk, MD (US);
Meredith N. Hutchinson, Washington, DC (US);
Joseph M. Singley, Elysburg, PA (US);
Vincent J Urick, Alexandria, VA (US);
Jason D. McKinney, Bowie, MD (US);
Keith J Williams, Dunkirk, MD (US);
The United States of America, as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A system for suppressing even-order distortion in a photonic link includes a laser for providing laser light to a first input of a Mach-Zehnder modulator (MZM), where the MZM has a second input for receiving an RF input signal, a third input for applying a DC bias voltage to the MZM, and an optical signal output. A dc-voltage-biased photodiode has an input, coupled to the MZM optical signal output, and a modulated RF signal output. The MZM DC bias voltage is set at a value to generate an even-order distortion amplitude substantially equal to an even-order distortion amplitude from the photodiode and 180 degrees out of phase so as to substantially cancel the photodiode even-order distortion. The invention provides the cancellation of photodiode even-order distortion via predisortion linearization with a MZM biased slightly away from quadrature, employing a single fiber run and a single photodiode. The invention provides an improvement in carrier-to-intermodulation ratio (CIR) upwards of 40 dB.