This paper focuses on the impact of different
parameters on the performance of the Subcarrier Multiplexed
Optical Transmission System for the application on radio link via
optical fiber. Performance results are evaluated for QPSK data
format for ODSB and OSSB modulation of Microwave
subcarriers with digital NRZ coded random data patterns. The
four subsystems of QPSK modulators are at 400, 500, 600, 700
MHz subcarrier frequencies with frequency spacing of 100 MHz.
The power of subcarriers is decreasing with increasing the link
distance due to dispersion and attenuation. By using dispersion
compensation fiber, the link distance has been enhanced from 100
km to 240 km successfully. The impact of chromatic dispersion
has been reduced in OSSB by using dual-electrode MZM. The
constellation diagram also confirms that the phase of the signal
after traveling through the link is changing due to dispersion. The
phase is the same for subcarrier 600 MHz & 700 MHz for ODSB
and OSSB in QPSK SCM. The impact of linewidth and
responsivity on SNR has also analyzed to evaluate the
performance. It is concluded that the maximum SNR is decreasing
with increase in the linewidth of laser source and increasing with
the increase in responsivity of PIN diode for the same fiber length
in SCM transmission.
The Role of Electrical Pulse Shapes in Electrical and Optical Chromatic Dispersion Compensation
