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We present a preliminary study of bidirectional ultra-stable optical frequency and precise time transmission over 406 km long path in the telecom-grade fiber optic infrastructure of dense wavelength division multiplexing. The main challenge in this application is the need of bidirectional amplification to compensate for signal loss. Directional non-reciprocities of the time transfer are evaluated...
High speed optical data networks are ubiquitous today. Data transmissions are based on coherent detection principles and use multilevel phase modulations. But another area of new applications is for example fiber-optic sensing. Such non-data signals present new challenges when designing networks. National research and educational network are at the forefront of such new developments.
We experimentally verified the resilience of the semiconductor optical amplifier with holding beam injection to reflections from transmission line in bidirectional operation over 200 km single fiber path together with influence of the temperature. The experiments show possible positive effects of such configurations with potential to improve bit error rate of transmitted signals.
Nowadays, fiber-optic sensors are widely used in many areas of an industry. To confirm increasing interest in these sensors we performed a short survey of market analysis not only for recent years but also market prediction for a near future. We performed also a short survey of current trends in fiber-optic sensors based on latest published results. For special applications we designed two possible...
We present implementation of a pilot bidirectional line IPE-VUGKT for precise time transmission. Directional non-reciprocities are evaluated together with uncertainties. Emphasis is given to the evaluation of the Sagnac effect. Our approach improves significantly the uncertainty.
Optical and photonic networks are a subject of renewed interest among the research and engineering communities. In order to provide fertile ground for disruptive experiments, researchers must have access to a testing environment. This article describes a remote-accessible Photonic Testbed deployed at CESNET's laboratories in Prague. The majority of the testbed's features are controlled over the network,...
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