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A German research institute has developed a receiver system for fibre-guided ultra-precise frequency signals. The system enables the transmission of the signal of an ultra-stable single-frequency laser over long distances in regular telecommunications optical fibres, solves the problem of the connection of a large number of customers to a single fibre link and represents a significant step in the transmission of the time signal of an optical clock. The institute is searching for licensees.
A research Institute active in metrology in Germany has developed a receiver system for fibre-guided ultra-precise frequency signals. The system enables the transmission of the signal of an ultra-stable single-frequency laser over long distances in regular telecommunications optical fibres. The invention solves the problem of the connection of a large number of customers to a single fibre link. Additionally the invention represents a significant step in the transmission of the time signal of an optical clock (atomic clock from the socket).
An optical frequency is transmitted over a long optical fibre line and can now be sampled at any point on the line - despite the expected interference in phase, centre frequency and polarization - and traced back to the original frequency of a German standard. This is achieved by a combination of two signals, the forward and the backward signal, to a beat signal. A simple analog algorithm generates a correction frequency. An acousto-optical modulator (AOM) superimposes the disturbed signal with this correction frequency and regenerates the desired original frequency signal with high precision. Simple standard components of telecommunications technology are used in the receiver. Subsequent receiving stations are not disturbed by the decoupling at the fiber coupler of a single station. In point-to-point experiments, the transmission technology has been proven over distances of more than 100 km.
Receivers of this type are required in the field of laser technology for the calibration of high-resolution spectrometers and the fine tuning of local reference lasers on the receiver side. Combined with a local frequency comb generator, further precise frequencies can be generated, even in the microwave range. In the field of chemical analysis with high-precision lasers, the system can be used indirectly for verification of detection sensitivity and quality assurance.
The research institute is searching for licensees.
The offered system has the following advantages:
- provision of the frequency signal with a bandwidth of around 1 Hz in a normal fibre-optic cable over long distances
- Traceable to a normal
- Multiple sampling at any location
- Distribution of the frequency signal in local networks over several hundred metres with low quality losses
Patent granted in Germany
The institute looks for licensees and partners for research cooperations, interested in the commercial use of the system as licensee.