This tutorial reviews the Holevo capacity limit as a universal tool to analyze the ultimate
transmission rates in a variety of optical communication scenarios, ranging from …

Deep-space optical communication links operate under severely limited signal power,
approaching the photon-starved regime that requires a receiver capable of measuring …

Optical links can achieve spectral efficiencies beyond the Shannon limit by employing
quantum joint detection receivers that decode messages collectively. We introduce a novel …

The optimal discrimination of coherent states of light with current technology is a key
problem in classical and quantum communication, whose solution would enable the …

We report on a novel phase-locking technique for fiber-based Mach–Zehnder
interferometers based on discrete single-photon detections, and demonstrate this in a setup …

The information capacity of an optical channel under power constraints is ultimately limited
by the quantum nature of transmitted signals. We discuss currently available and emerging …

In optical communication, the transmitter encodes information into a set of light states
defined by the modulation format, selected to accommodate specific channel conditions and …

Deep space optical communication (DSOC) is becoming a hot topic. Pulse position
modulation (PPM) is an effective tool to realize DSOC benefiting from the feature of high …

Differential pulse-position modulation (DPPM) shows significant power and bandwidth
efficiency, but suffers from serious insertion/deletion and substitution errors if the DPPM soft …

We identify the maximum attainable transmission rate of a noisy optical link employing the
pulse position modulation (PPM) format with direct detection. We show that for a fixed …