Electrooptic measurement systems for frequency analysis of very wide range signals

US5041778A · kind A · utility

Assignee

• Etat Francais, Represente par le Ministre des Pos Tes, Destelecommunicati ons et de l'Space-Centre National d'Etudes des Telecommunications (C.N.E.T.) · FR

Inventors

• Slimane Loualiche · Lannion, FR
• Francois Salin · Muret, FR

Key dates

• Filing date: Jul 17, 1989
• Grant date: Aug 20, 1991
• Expiry date: Jul 17, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R23/17
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A spectrum analyzer for a variable amplitude and frequency electric signal includes an optical modulator responsive to the signal that derives a first optical wave having intensity and frequency components corresponding to the signal amplitude and frequency components. An optical analyzer responds to the first optical wave to derive a second optical wave having intensity variations at frequency components corresponding to the amplitude of the electric signal at the frequencies in the spectrum of the signal. The optical analyzer includes a tunable optical cavity responsive to the first optical wave to derive the second optical wave.