# O-Band Differential Phase-Shift Quantum Key Distribution in 52-Channel C/L-Band Loaded Passive Optical Network

## TL;DR

This paper evaluates a cost-effective quantum key distribution transmitter in a passive optical network, demonstrating secure key rates and coexistence with classical channels over a 16km reach with minimal degradation.

## Contribution

It introduces a practical QKD transmitter implementation compatible with existing PON infrastructure and assesses its performance and coexistence capabilities.

## Key findings

- Secure bits per pulse: 5.10^-7
- QBER degradation: below 1.1%
- Supports coexistence with classical channels

## Abstract

A cost-effective QKD transmitter is evaluated in a 16km reach, 2:16-split PON and yields 5.10-7secure bits/pulse. Co-existence with 20 down-and 1 upstream channel is possible at low QBER degradation of 0.93% and 1.1%.

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Source: https://tomesphere.com/paper/1904.02188