A New Design of the Passively Multi-Mode Fiber MZ Interferometer for Compressing Pulse Application
Abstract
Nowadays high data rates optical fiber communication system demanding and consolidating the use of compact and tunable pulse laser sources with narrow temporal Full Width at Half Maximum (FWHM). In this work narrow pulsed and compressed laser source that works in c- band region which is suitable window in optical fiber communication system. Compression factor (Fc) is figure of merit of this work which is grantee the performance of compression process. This approach was done after designing inline cascaded Multimode fiber Mazh-Zehnder Interferometers (CMMF-MZIs) pulse compressor. This type of fiber interferometer has cascaded seven MZIs with controlled there Fee Spectral Range (FSR). Tenability of pulsed compressed c- band laser source was done after manipulating the Vernier effect that produced after applying mechanical forces to the cascaded MMF-MZIs that have been investigated after splicing seven multi-mode fibers (50/125) μm with single mode fibers (SMF-28), all these segments of fibers have equally length with 10 cm. In this work 1546.7 nm and 1.32 mW pulsed laser source was propagated with 7 cascaded MMF-MZIs with different free spectral range that varied after applying mechanical forces on seven cross sectional areas of multimode fiber and also on the eighth micro cavity splicing regions between the single and multimode fibers. Two minima compression factors were obtained one is 1.15 when 5g weight was applied on the two splicing regions (7, 8) that related to the forth spliced multimode fiber lead 144 pm blue shift laser central wavelength while 1.11 was obtained with 100g applied at the third 10 cm multimode fiber cross sectional area with 71 pm red shift the central wavelength. Also the central wavelength of the out coming pulsed laser source was located in the range (1546.032-1547.260) nm when the two mechanical weights 5 and 100 g are applied on the two micro- cavity splicing regions (3,4) and (1,3) respectively.