A single laser source based free space optical link for transmission of bidirectional data of three different channels between modular data centers, where each channel has a data rate of 20 Gbps.
The downlink channels are transmitted using a combination of differential quadrature phase shift keying (DQPSK)and pulse amplitude modulation (PAM). The uplink channels are transmitted using On-Off keying (OOK).
The simulation implements the technique presented in the following journal paper:
https://link.springer.com/article/10.1007/s13369-022-06975-3.