Linearisation Method of DML-based Transmitters for Optical Communications Part II: Experimental Demonstration and Implementation Methods

• Main Authors: Bamiedakis, N, Cunningham, DG, Penty, RV
• Format: Article in Journal/Newspaper
• Language: English
• Published: Institute of Electrical and Electronics Engineers (IEEE) 2021
• Subjects: Vertical cavity surface emitting lasers; Mathematical model; Current measurement; Data communication; Optical transmitters; Optical modulation; Optical fiber communication; Directly-modulated lasers; linearization method; non-linearity; optical links; DML
• Online Access: https://www.repository.cam.ac.uk/handle/1810/325186; https://doi.org/10.17863/CAM.72640

In this paper, we report the first experimental demonstration of the Stretched A linearisation method. The theoretical framework of the method and related simulation studies have been presented in Part I of this work. Here, we apply the method on an 850 nm multimode vertical-cavity surface-emitting laser (VCSEL) specified for operation at 10 Gb/s and demonstrate good quality optical output waveforms with little non-linear distortion at 16 Gb/s using non-return-to-zero (NRZ) modulation. An experimental sensitivity analysis on the generation of the required modulating current components demonstrates large tolerance to parameter mismatch. In addition, it is shown that an adaptive gain scheme can improve the tolerance to the timing offset between the current components. Potential hardware implementations using either analog or digital electronics are also discussed.