Deployment of 1610 nm InAs/InP Quantum-dash Laser Diode in 28-50 GHz Hybrid RoF-RoFSO-Wireless Transmission System

In this paper, we report on our recent demonstrations on deploying mid L-band ~1610 nm quantum-dash (Qdash) laser diode (LD) in millimeter-wave (MMW) applications. 28 and 30 GHz MMW beat-tones are generated using a self-injection-locked (SIL) Qdash LD-based comb source (QDCS) with phase noise of ~120 dBc/Hz at 1MHz offset frequency. Moreover, we demonstrated transmission of these MMWs over various channels comprising of single-mod-fiber (SMF), generally known as radio-over-fiber (RoF), freespace-optics (FSO), known as radio-over-FSO (RoFSO), and wireless (WL) links, which are attractive solutions for future flexible next-generation access networks (NGANs). In particular, we demonstrated successful transmission of 28 and 30 GHz MMW modulated with analog 2 Gb/s quadrature-phase-shiftkeying (QPSK) data over hybrid 20 km SMF – 5 m FSO and 06 m WL channel. Moreover, we also discussed our very recent preliminary results of 50 GHz high-frequency generation and transmission utilizing QDCS. In this case, we showed error-free transmission of 2 Gb/s QPSK data over 50 GHz carrier and 11.6 km SMF – 6 m FSO and 0-1 m WL channel. This rule-changing broad multi-wavelength lasing spectrum from Qdash LD and emission covering Sto U-band has made it a prime contender for NGANs.