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. 09, 2004
Filed:
Jul. 28, 1999
Christoph Peter Serbe, Huettlingen, CH;
Contraves Space AG, Zurich, CH;
Abstract
The device for the homodyne reception of optical phase-keyed signals comprises a heterodyne receiver ( ), a data discriminator ( ), a frequency acquisition circuit ( ) and a local oscillator laser ( ). In addition, the device has a window discriminator circuit consisting of a window comparator ( ) and a feedback unit ( ), whose output is connected with the input of a reversing switch ( ). The window comparator ( ) has been inserted between the output of the heterodyne receiver ( ) and the one input of the feedback unit ( ), whose other input is supplied with the output signal (Si) of the discriminator ( ). The output of the frequency acquisition circuit ( ) is connected with the other connector of the reversing switch ( ), whose output signals supplied to the control input of the local oscillator laser ( ). The window comparator ( ) has two or more thresholds. The feedback unit ( ) can have a control input for a quadrature channel (Sq). Use of the window comparator ( ) permits the determination of the phase of the optical carrier signal, and therefore the phase regulation of the local oscillator laser ( ).