2 research outputs found
Testbed Verification of New Fronthaul Technology for 5G Systems
The fronthaul for 5th generation mobile systems (and beyond) has evolved with new splits for the radio access network functions defined, and the transport for these split interfaces having very different requirements. Testing of the transport for such split interfaces is reported, and it is shown that an Ethernet fronthaul transport network, which is capable of bringing efficiency gains through statistical multiplexing, can meet stringent latency and latency variation requirements, assuming buffering and playout of the radio waveforms and that timing/synchronization signals are prioritized. An aggregation technique for a 100 Gb/s Ethernet trunk which provides for such timing signals is demonstrated. Real-time monitoring of the Ethernet fronthaul for software-defined networking control and performance optimization is also shown
Impact of Chirp in High-Capacity Optical Metro Networks Employing Directly-Modulated VCSELs
Directly modulated long-wavelength vertical cavity surface emitting lasers (VCSELs) are
considered for the implementation of sliceable bandwidth/bitrate variable transceivers for very
high capacity transmission (higher than 50 Gb/s per wavelength) in metropolitan area systems
characterized by reduced cost, power consumption, and footprint. The impact of the frequency
chirp measured for InP VCSELs with different kinds of design (high-bandwidth very short cavity
and widely-tunable with micro electro-mechanical systems (MEMS) top mirror) is analyzed in case
of discrete multitone (DMT) direct modulation in combination with 25-GHz wavelength selective
switch (WSS) filtering. The maximum transmitted capacity for both dual side- and single side-band
DMT modulation is evaluated as a function of the number of crossed nodes in a mesh metro network,
comparing VCSEL based transmitters performance also with the case of external electro-absorption
modulator use. Finally, the maximum reach achieved based on the received optical signal to noise
ratio (OSNR) and the fiber span length is discussed. The results confirm the possibility to use
directly-modulated long-wavelength VCSELs for the realization of sliceable bandwidth/bitrate
variable transmitters targeting 50-Gb/s capacity per polarization, also in the presence of 5 crossed
WSSs for reaches of hundreds of kilometers in multi-span Erbium-doped fiber amplified (EDFA)
metro links supported by coherent detection