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:
May. 14, 2002
Filed:
Mar. 30, 1999
Mathias Bischoff, München, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A first optical signal is generated via a first laser diode on which a low-frequency signal of small amplitude is superimposed. The first optical signal is conducted through a gas-filled galvanotron and the low-frequency signal emerges at two terminals of the galvanotron. The low-frequency signal is fed to a synchronous detector and emits a first output signal for generating a control signal. The first laser diode is controlled via the control signal and the low-frequency signal, the first optical signal passes through the gas-filled galvanotron and represents a first frequency reference signal. A second optical signal is generated via a second laser diode and emits the second optical signal via a first fiber-optic directing coupler to a signal output and to a second fiber-optic directing coupler. A microwave signal is generated by combining the second optical signal and the first frequency reference signal via an opto-electronic converter. The microwave signal is fed to a frequency control loop subsequent to opto-electric conversion and mixes the microwave signal with a quartz-based frequency synthesizer signal for generating a difference low-frequency signal. A phase comparison is provided of a signal of the quartz oscillator and the difference low-frequency signal resulting in a second output signal for generating a control signal for the second laser diode.