Abstract
To overcome the frequency-dependent nonlinear characteristics of a directly modulated laser (DML) in a multi-level optical transmission, the spectrum-split digital pre-distortion (SS-DPD) is proposed and experimentally demonstrated to mitigate the frequency-dependent nonlinear impairments. The SS-DPD is employed in a 5 Gb/s PAM-4 optical transmission using a DML over a 5 km standard single-mode fiber at 1550 nm. We experimentally compared the SS-DPD with the DPDs based on the Volterra series and the memory polynomial (MP). The results demonstrate that the SS-DPD improved approximately 1 dB in terms of the receiver sensitivity compared with the MP-DPD. Moreover, the SS-DPD achieves 0.4 dB receiver sensitivity gain compared with the Volterra DPD.
Highlights
Due to the increase in the demand for 5G, Internet of things, artificial intelligence, AR/VR, cloud computing, and multimedia services, the signal bandwidth requirements for short-reach optical communications is rapidly increasing
This study proposed and experimentally demonstrated a novel Digital pre-distortion (DPD) method using a spectrum split model to mitigate the frequency-dependent nonlinear impairments of the multi-level optical transmission link
The proposed spectrum-split digital pre-distortion (SS-DPD) is effective to compensate for the frequencydependent nonlinear distortion
Summary
Due to the increase in the demand for 5G, Internet of things, artificial intelligence, AR/VR, cloud computing, and multimedia services, the signal bandwidth requirements for short-reach optical communications is rapidly increasing. In the short-reach optical communication, the intensity modulation and direct detection (IM/DD) is the typical method because of their cost effectiveness and simple implementation. Directly modulated lasers (DMLs) have some challenges to employ, a DML is preferred for its cost effectiveness, high optical output power, and less energy consumption [1]. The modulation bandwidth can be limited by the frequency response of electrical devices, optical devices, and transceivers sampling performance. For a short-reach optical transmission system, PAM is more promising than other modulation formats because of its simple structure and low power consumption [5].
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