Development of an Effective Optical Amplifier and Performance Evaluation in Communication Systems

The Doctoral Thesis investigates and analyses several scientific studies regarding the use of EDFA, Raman, FOPA, and hybrid optical amplifiers in wavelength-division multiplexed (WDM) communication systems. Computer simulation software – specifically RSoft OptSim and VPIphotonics Design Suite – was employed. Particular attention is paid to optical amplifiers utilising dual rare-earth-doped fibers and an in-fiber cladding-pumping technique. The Thesis also evaluates a method for broadening 50 ps electrical pulses using a high-precision event timer, Bessel and Butterworth filters, and various custom-built cascaded low-pass filters (LPF). Bit Error Rate (BER) performance was analysed for both optical back-to-back (B2B) configurations and configurations involving 20 km transmission over single-mode fiber (SMF), utilising a pulse duration (τ) of 50 ps and varying pulse width values (∆) – 50 ps, 100 ps un 200 ps. The fabrication of spherical lenses – or microspheres – was demonstrated using the commercially available Fujikura-100P+ arc fusion splicer, a device employed for integrated photonic devices.