Inter-satellite links are crucial for covering the entire globe for information transmission. Traditional space communication
systems are based on microwave links, which have high deployment and maintenance cost and high latency. Recently, the
application of laser-based optical wireless communication links for inter-satellite applications has gained significant attention
due to its many advantages including low deployment and maintenance cost, high modulation bandwidth, secure
transmission, low latency networks, and high-speed transmission. In previous works reported on inter-satellite optical
wireless communication (IsOWC) links, single-channel links employing conventional modulation formats are demonstrated.
Future space technology demands inter-satellite links that permit high-speed information transmission between two or more
satellites. In this work, to enhance the spectral-efficiency and transmission speed of IsOWC systems, mode division
multiplexing technique is incorporated. Further, to transmit high-speed data without inter-symbol interference, orthogonal
frequency division multiplexing with coherent detection is employed. Distinct Hermite Gaussian spatial modes are used to
transport two independent 50 Gbit/s information signals at 20500 km. Also, the link performance is investigated for different
modulation schemes and operating wavelengths. Further, the impact of space turbulence, including transmitter and receiver
pointing errors on the received signal quality is analyzed. We also discuss a square root device-based detection for nonlinearity compensation at the receiver for improved transmission range.
IsOWC, CO-OFDM, MDM, BER, Space turbulence, Non-linearity compensation.
KARAMJEET SINGH, MEHTAB SINGH, JYOTEESH MALHOTRA, AMIT GROVER, Long-reach cost-effective 100 Gbit/s CO-OFDM-MDM-based inter-satellite optical wireless communication (IsOWC) system, Optoelectronics and Advanced Materials - Rapid Communications, 15, 5-6, May-June 2021, pp.245-253 (2021).
Submitted at: June 29, 2020
Accepted at: June 11, 2021