Browsing by Author "Bradu, Adrian"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Algorithm for Excitation Optimization of Fabry–Pérot Filters Used in Swept SourcesPublication . Avanaki, Mohammad R. N.; Bradu, Adrian; Trifanov, Irina; Lobo Ribeiro, Antonio B.; Hojjatoleslami, Ali; Podoleanu, A. G.We investigate the improvement in the nonlinearity of a conventional wavelength swept laser source on the basis of a fiber Fabry-Pérot tunable filter using a well-established optimization method, simulated annealing (SA). The signal driving the filter is constructed from many short ramps of different slopes that are interconnected. The values of the slopes are optimized through the SA algorithm to achieve maximum amplitude for the Fourier transformed peaks of the photodetected interferometric signal.
- Characterization of a fibre optic swept laser source at 1 μm for optical coherence tomography imaging systemsPublication . Trifanov, Irina; Neagu, Liviu; Bradu, Adrian; Lobo Ribeiro, Antonio B.; Podoleanu, Adrian Gh.We report the development of a swept wavelength laser at 1 micron based on a linear cavity fibre configuration with an intra-cavity half symmetrical confocal Fabry-Perot tunable filter and a semiconductor optical amplifier as a gain medium. The performances of the source in terms of parameters like: sweep repetition rate (1-20 kHz), center wavelength (1065 nm), wavelength scanning range (max. 50nm), instantaneous line-width (<0.1nm) and a boosted output power of around 40 mW are demonstrated. The new source tested on an OCT system is exhibiting sufficient linearity in wave-number (k-space) at 1 kHz repetition rate; therefore no k-trigger, or wavelength rescaling process was needed.