Abstract
Radio over fiber is becoming an increasingly important technology for the wireless market since it introduces a higher data transmission rate and large bandwidth. In this paper, we have compared OQPSK and DPSK bidirectional radio over fiber ROF systems, where an offset quadrature phase shift keying (OQPSK) or differential phase shift keying (DPSK) signals are used for down-link and an on-off keying (OOK) signal re-modulated for up-link. Several measurements were performed including Bit Error Rate (BER) curves for uplink and downlink, RSOA gain curve and noise figure with the variation of input power and temperature for each system.
Highlights
The proliferation of wireless devices coupled with increased demand for broadband services are putting pressure on wireless systems to increase capacity
OQPSK and DPSK bidirectional radio over fiber ROF systems have been compared, where an offset quadrature phase shift keying (OQPSK) or differential phase shift keying (DPSK) signals are used for down-link and an on-off keying (OOK) signal re-modulated for up-link
The Bit Error Rate (BER) versus input optical power Pin curves for the downlink and uplink are shown in Fig.8.It is noted from the figure that the BER for the uplink goes down slowly with increasing Pinfrom -2 dBm to 10 dBm
Summary
The proliferation of wireless devices coupled with increased demand for broadband services are putting pressure on wireless systems to increase capacity. The raising of the carrier frequency would limit propagation characteristics; as a consequence, small cell sizes are formed This leads to a large number of cells in a certain area, and large number of remote antenna base stations (BSs) is required to cover an operational geographical area. These BSs provide wireless connectivity to users via millimeter-wave and are connected with a central office (CO) via an optical fiber access network. The functionality of RoF application technology exceeds modulation and frequency conversion to include signal processing such as filtering and attenuation control at high frequencies which referred to as microwave functions Many of these functions are difficult to achieve in the electrical domain due to limited bandwidth and other electromagnetic wave propagation limitations.
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