|
| |
|
| |
|
|
Zařízení pro výrobu kónicky zúžených optických vláken
Martan, Tomáš ; Novotný, K. ; Honzátko, Pavel ; Kaňka, Jiří
The paper deals with technology of manufacturing fiber tapers that are made by heating and stretching a standard optical fiber (e.g. SMF, PCS or MOF) in a heat source. For fabrication of the fiber tapers have been designed and assembled the apparatus that is propelled with motors and controlled by a PC and other electronic equipments. Manufactured tapered optical fibers can be used e.g. in nonlinear optics, for various types of fiber evanescence chemical sensors and holography. 482
|
|
| |
|
|
Measurement of short pulses using fiber frequency-resolved optical fating
Vraný, Boleslav ; Honzátko, Pavel ; Kaňka, Jiří
We have reviewed and implemented the method of frequency-resolved optical gating. We discuss the fiber FROG experimental setup and several algorithms for pulse retrieval. These include the basic algorithm, the generalized projections and the genetic algorithm. We have developed new variants of the pulse retrieval algorithms by combining the generalized projections and the genetic algorithm and are experimenting with them to get optimal performance.
|
|
|
Er: Yb fibre-optic laser excited by a diode
Zavadilová, A. ; Kubeček, V. ; Honzátko, Pavel ; Kašík, Ivan ; Matějec, Vlastimil
The paper deals with the employment of special optical fiber doped in the core with ytterbium and erbium ions in a fiber laser emitting at 1540 nm. The fiber was drawn from a preform prepared by the MCVD method at it was coated with a polysiloxane polymer coating with a refractive index lower than of silica. This coating makes possible to launch light from a laser diode directly into a silica jacket of the fiber. An output power of 47 mW was measured with an excitation diode power of 860 mW.
|
|
|
Microstructure optical fibres
Kaňka, Jiří ; Honzátko, Pavel ; Matějec, Vlastimil ; Kašík, Ivan ; Martan, Tomáš
A review of microstructure optical fibers, their use and methods of preparation is presented. Two classes of microstructure optical fibers in accordance with wave guiding mechanism are introduced. Unique dispersion properties and their structure dependence are discussed. Highly nonliner fibers, large mode area fibers and highly birefringent fibers are reported. Finally, the research carried out IREE Prague is summarized.
|
|
|
Measurement of intermodal dispersion in a twin-core optical fibre
Peterka, Pavel ; Kaňka, Jiří ; Honzátko, Pavel
The intermodal dispersion (IMD), that arises from the difference of group delays of the two fundamental modes of the twin-core fibre (TCF), could have a detrimental effect for usage of TCF in high-speed applications. Therefore, its accurate determination is of a high interest. We have estimated the IMD from the fibre refractive index profile and we have determined it from the interference pattern in spectral domain and from the repetition rate of passively mode-locked fibre laser incorporating TCF.
|
|
| |
|
| |
guest ::
