Design of a dual LG modal 4 × 50Gbps OFDM-FSO system using backhaul fiber and fronthaul FSO link under severe climate scenarios
摘要
The continued growth of data traffic is challenging existing optical access systems. Besides this, demands for high-capacity and long-reach data communication links are extending to meet the explosive internet activities. In this work, a 4 × 50Gbps orthogonal frequency division multiplexing (OFDM) system based on mode division multiplexing (MDM) is realised over integrated fiber and free space optics (FSO) links. Two Laguerre-Gaussian (LG) beams at [0,0] and [1,0] index are transmitted under the impact of diverse climate scenarios. Results shows that the maximum FSO range of 1490 m is achieved with 40 km fiber range at aggregate data rate of 200Gbps at 200 and 30 °C temperature. Also, acceptable beam divergence of 2.9mrad at 5-10 mA bias current is achieved at 1000 km FSO with 40 km fiber range. Under haze and rain climates, the system can sustain maximum 5.5dB/km attenuation at 500 m FSO distance. Besides, fiber range can be extended to 100 km with 50 m FSO range at -10dBm to -25dBm received power. Compared to existing works, the proposed system offers optimum performance.