Catherine Algani

VCSEL-SSMF-based Radio-over-Fiber link for low cost and low consumption wireless dense networks

This paper presents a possible Radio-over-Fiber (RoF) system which can be implemented in current and next generations of cellular networks such as LTE or future 5G. The system proposed is based on low cost and low consumption optical components such as 850 nm Single Mode Vertical Cavity Surface Emitting Lasers (VCSELs) and Standard Single Mode Fiber (SSMF) of G.652 type. The performances are evaluated through the computation of the Error Vector Magnitude (EVM) for an entire LTE frame of 10 ms for 20 MHz band signal in band 20 of the standard. Appropriate countermeasures were adopted against the bandwidth reduction due to the behavior of the G.652 fiber, which in the first optical window stops to exhibit monomodality. This allowed to achieve high modulation format transmission is done for various input RF powers and for distances stretching up to 1.5 Km.

Design of a V-Band Buffer Amplifier for WPAN Applications

This paper presents a V-band buffer amplifier based on 0.15 µm pHEMT from UMS foundry for WPAN applications. This amplifier will be used as a part of a frequency quadrupler in the millimeter wave band at 60 GHz. The amplifier circuit can deliver a gain up to 13 dB at 60 GHz with a low noise figure of 2.4 dB. An input return loss of 18 dB and an output return loss of 10 dB are also achieved by this amplifier. The input P1 dB and IP3 are 0.3 and 27 dBm respectively.