We evaluate the three Mach–Zehnder interferometer (MZI) techniques of optical add drop multiplexer for dense wavelength-division-multiplexing (DWDM) system and investigate the impact of crosstalk obtained at 8×10 Gbps with 0.1 nm channel spacing. The DWDM transmission with optical add drop multiplexer (OADM) placed at the 35 km point of a 70 km link has been demonstrated. It is also observed that Mach–Zehnder interferometer-fiber Bragg grating (MZI–FBG)-based OADM and MZI-based OADM provide better results with maximum covered distance (150 km) at channel spacing of 0.1 nm and bit rate of 10 Gbps without using dispersion compensating fiber (DCF) and amplifier and the worst case is found with the Mach–Zehnder interferometer-semiconductor optical amplifier (MZI–SOA)-based OADM. It is also found that the MZI-based OADM is cost effective as compared to MZI–SOA and MZI–FBG-based OADM.
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