Abstract
The objective of this work is to implement differential phase shift keying (DPSK) encoded multiple data channels and local oscillator frequency over a common optical fiber with wavelength conversion using semiconductor optical amplifier Mach–Zehnder interferometer (SOA-MZI) and to recover the data signals by using different recovery schemes. The crosstalk penalties are kept at minimum value. One frequency up-converter is used in the system to reduce the complexity and cost of the system. An error free transmission of 1 Gbps differential phase-shift keying (DPSK) data at 2.5GHz to an optical radio frequency (RF) signal having the frequency of 30GHz is achieved through the designed system. The conversion efficiency at fRF+fIF is found to be maximum when the optical local oscillator power is approximately −2.5dBm. Further, the electric power has also been measured for the upconverted and downconverted signal which clearly indicates that crosstalk is not being imposed on the signals by SOA-MZI.
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