Pules Compression Using Nested Hybrid Sagnac Etched PM Interferometer

Narrow laser pulses have been essential sources in an optical communication system. A high data rate optical communication network system demands a compressed laser source. Pules laser source was obtained in this experiment after using a pulse duration of 9 ns, 1.2297 mW peak power, full width half maximum (FWHM) 286 pm, and a central wavelength of 1546.7 nm. This paper will study tunable FWHM using 10cm polarization-maintaining fibers (PMF) with different cladding diameters formed by etching 125μm PMF after immersing these with the Hydrofluoric acid HF of 40% concentration. Nested hybrid Sagnac etched polarization-maintaining fiber – Mach Zander interferometer was structured in three different arms, that are parallel to each other. The first arm consists of 10 cm PMFs with an etching time of10 min, and a (112.3) μm fiber diameter. The second arm has a PMF length of 10 cm, an etching time of 20 min, and (an 88.3) μm fiber diameter. The third arm consists of a PMF length of 10 cm, etching time of 30 min, and (72.8) μm fiber diameter. This system was studied in the application of (UOCS)with four samples of water seawater, shallow water, coastal water, and distilled water. The minimum specially FWHM in the coastal water, distilled water is 149 pm, and the FC = 1.9. It was found that the hybrid sagnac interferometer can be used efficiently as a narrow optical communication system since it has high sensitivity in the pm range.
Keywords: pulse compressor, Etched PMF, hybrid Sagnac interferometer (HSI), Mach -Zander interferometer, samples water