# Demonstration of an LO-less, DSP-free QPSK Receiver for Data Center Interconnects

## TL;DR

This paper demonstrates a novel LO-less, DSP-free QPSK receiver suitable for high-capacity, short-distance optical data center links, emphasizing low power consumption and simplified design.

## Contribution

It introduces the first experimental demonstration of an all-analog, LO-less coherent receiver for SH-QPSK, eliminating the need for digital signal processing.

## Key findings

- Successful experimental validation of the LO-less receiver
- Effective use of an analog CMA-based equalizer chip
- Potential for low-power, high-capacity optical interconnects

## Abstract

We present the first demonstration of a local oscillator (LO)-less digital signal processing (DSP)-free coherent receiver for high-capacity short distance optical links. Experimental results with an analog domain constant modulous algorithm (CMA)-based equalizer chip for the self-homodyne quadrature phase shift keying (SH-QPSK) system validate the employability of an all-analog and LO-less receiver for low-power interconnects.