Aditya Kakkar

TL;DR: This manuscript discusses the motivations for jointly utilizing transmission techniques such as probabilistic shaping and digital sub-carrier multiplexing in digital coherent optical transmissions systems and describes the key-building blocks of modern high-speed DSP-based transponders working at up to 800G per wave.

TL;DR: In this article, a 116 Gb/s on-off keying (OOK), four PAM and 8 PAM optical transmitter using an InP-based integrated and packaged externally modulated laser for high-speed optical interconnects with up to 30dB static extinction ratio and over 100-GHz 3dB bandwidth with 2 dB ripple.

TL;DR: Gigabit free-space transmissions are experimentally demonstrated with a quantum cascaded laser emitting at mid-wavelength infrared of 4.65 μm, and a commercial infrared photovoltaic detector, and the proposed transmission link shows a stable operational performance in the lab environment.

TL;DR: A thorough analysis of equalization-enhanced phase noise (EEPN) and its impact on the coherent optical system is presented and it is shown that in coherent optical systems utilizing electronic dispersion compensation, this noise corresponds to multipath fading in wireless communication systems.

TL;DR: It is established that different regimes of the laser FN-spectrum cause a different set of impairments, and the influence of the impairments due to some regimes can be reduced by optimizing the corresponding mitigation algorithms, while other regimes cause irretrievable impairments.