Abstract
Free Space Optical (FSO) communications are a promising alternative over conventional fiber-based wired systems. The unobstructed employment of this technology critically depends on its robustness against atmospheric impairments, such as scintillation. A semiconductor optical amplifier (SOA) in conjunction with optical filtering can act as amplitude equalizer to restore the quality of the impaired FSO signal. In this paper we propose to exploit as hard limiter a SOA whose current is directly modulated by non-return-to-zero (NRZ) electrical data pulses that correspond to the distorted FSO signal components. Moreover, we employ after the SOA two microring resonators (MRRs), which are configured as notch filters and are detuned toward opposite sidebands to mutually compensate for the SOA bandwidth-limited modulation response. The simulation results demonstrate the capability of the SOA-dual MRR-based scheme to efficiently compensate for the scintillation-induced amplitude deviations with enhanced performance.
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