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:
Jan. 14, 2014
Filed:
Jul. 12, 2011
Michael Margraf, Berlin, DE;
Christoph Clemens Leonhardt, Berlin, DE;
Andreas Matiss, Berlin, DE;
u2t Photonics AG, Berlin, DE;
Abstract
An embodiment of the invention relates to a system comprising an optical device () and an evaluation device () for characterizing the optical device. The optical device comprising a 90° optical hybrid unit () having a first and second optical input (EE) and at least two optical outputs (A-A) wherein optical output signals (So-So) leaving the optical outputs have optical phase differences between each other of 90° or multiple thereof; a first photodetector (P) connected to a first optical output (A) and a second photodetector (P) connected to a second optical output (A), wherein the first optical output emits a first optical output signal (So) and the second optical output emits a second optical output signal (So), said second optical output signal having an optical phase difference of 180° relative to the first optical output signal; and a first transimpedance amplifier (Tr) connected to the first and second photodetectors (P, P). The evaluation device () is characterized by a signal source () configured to generate a first and second intensity-modulated optical input signal (Sin, Sin); an optical phase shifter () adapted to phase-shift the optical phase of the second intensity-modulated optical input signal relative to the optical phase of the first intensity-modulated optical input signal; a measurement unit () adapted to measure the electrical output signal of the first transimpedance amplifier (Tr); and a control unit () adapted to control the optical phase shifter.