Detection of changes in the time gap of signals - DESY -...
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DESY Technology Transfer Katharina Kull Notkestraße 85 D-22607 Hamburg [email protected] Tel: +49 40 8998-5342 Electronics Accelerators I Photon Science I Particle Physics Deutsches Elektronen-Synchrotron A Research Centre of the Helmholtz Association Technology Portfolio Detection of changes in the time gap of signals. Technology A femto-second accurate measurement of the temporal relation between two optical signals and of an optical and a microwave signal provides a variety of applica- tion possibilities. A highly precise synchronisation of various optical and electrical signals and high-resolu- tion applications in metrology are some examples for that. Fields of Application > Telecommunication > Navigation systems > Data transfer > Surveying
Transcript of Detection of changes in the time gap of signals - DESY -...
DESYTechnology Transfer
Katharina KullNotkestraße 85D-22607 Hamburg
[email protected]: +49 40 8998-5342
Electronics
Accelerators I Photon Science I Particle Physics
Deutsches Elektronen-SynchrotronA Research Centre of the Helmholtz Association
Technology Portfolio
Detection of changes in the time gap of signals.
Technology A femto-second accurate measurement of the temporal relation between two optical signals and of an optical and a microwave signal provides a variety of applica-tion possibilities. A highly precise synchronisation of various optical and electrical signals and high-resolu-tion applications in metrology are some examples for that.
Fields of Application > Telecommunication
> Navigation systems
> Data transfer
> Surveying
© 2015, Deutsches Elektronen-Synchrotron DESY
InnovationThe developed method significantly reduces the dependen-cy of the measurement results on the temperature and on the optical output. This method uses only one instead of two photo detectors for measuring the temporal relation between two optical signals so that the changes on the performance of the detector remain the same for both signals. Instead of a temperature-sensitive phase measurement, the performance of one or several laser harmonics (which change along with the temporal offset of both optical signals in this newly develo-ped method) are being measured. As a result, changes in the performance of the optical signals can be distinguished from the changes in the temporal offset.
The developed method utilises an electro-optical amplitude modulator in order to convert changes in the temporal offset into a change in the frequency spectrum when measuring the time offset of an optical and a microwave signal. The temporal offset of the signals results from a performance measurement of the modulated laser spectrum. The temporal measurement resolution is better than 10 fs.
Service & IP statusReady for licensing. Patented technology: EP 2 172 817, JP 5543742 und US 8,242,767.
Requests of potential licensees regarding regional or international property rights can be considered.
ProblemThe main problems of the previously used methods for measu-ring the temporal relation between two pulsed optical signals or a pulsed optical signal and a microwave signal are the low long-term stability on one hand and a very complicated test setup on the other hand.
Presently, each of the optical signals is detected with a photo detector in order to measure the temporal relation between these two pulsed optical signals. A high harmonic of the basic laser frequency is being selected with a band-pass filter from the frequency spectrum and then a phase detector determi-nes the temporal relation between the two signals afterwards. Temperature alteration in each of the three utilized compo-nents (photo detector, filter, phase detector) as well as a change of the optical output at the photo detector falsifies the measurement of the time offset.
This problem remains even when measuring the time offset of an optical and a microwave signal is done through a photo detector with a microwave oscillator replacing the filter.
Electronics
Detection of changes in the time gap of signals.
