Back to results
US 5,497,385 AGranted
Optical microwave generator
AssigneeAlcatel SEL Aktiengesellschaft
InventorHarald Schmuck
Life of this patent
Estimating the term…
Abstract
The invention relates to a microwave generator which is characterized by a multimode fiber ring laser (1) having associated with it an intermediate-frequency device (22) which generates the microwave frequency by forming the difference of the frequencies assigned to the modes.
Claims25
A microwave generator, characterized by:
- a fiber ring laser (1) which generates light of a plurality of optical frequencies and
- an intermediate-frequency device (22), optically connected to said fiber ring laser, said intermediate-frequency device including:
- means responsive to said light of a plurality of optical frequencies for selecting light of at least two of said plurality of optical frequencies, and
- means for generating an intermediate frequency (.DELTA.f) optical signal having a frequency which is the difference between said at least two of said plurality of optical frequencies, the frequency of said intermediate frequency optical signal being a microwave frequency.
1 more element
An optical transmitter comprising:
- a pump laser;
- and
- a fiber ring, including:
- a first coupler for coupling light emitted by the pump laser into the fiber ring;
- a second coupler for coupling light out of the fiber ring;
- a rare earth doped fiber positioned between the first and second couplers;
- an optical filter arrangement positioned between the first and second couplers, said optical filter arrangement being adapted to pass light having two selective bands for light of two different optical frequencies;
- and
- polarization-sensitive means for generating two orthogonal natural modes which are assigned different optical frequencies, the difference between the different optical frequencies being an intermediate frequency (.DELTA.f) optical signal.
6 more elements
Dependencies are inferred from the claim text.