Demonstration of Auxiliary Management and Control Channel Signal Transmission for FDM Coherent Passive Optical Network

For the first time, we proposed and demonstrated auxiliary management and control channel (AMCC) in frequency division multiplexing coherent passive optical network (FDM-PON) based on digital subcarriers (DCM) to transmit control information and reduce the latency of signal transmission. We propose an extraction algorithm to detect AMCC signals. A 4-band FDM QPSK coherent PON system of a total 100-Gbps data rate with a 24-Mbps non-return-to-zero (NRZ) signal was demonstrated and the system performance at different modulation index (MI) was analyzed.

I. Introduction

In recent years, with the rapid development of fifth-generation (5G) mobile communication network, cloud services, virtual reality (VR) applications and edge computing, user data traffic is increasing at a tremendous rate, so higher requirements are required on passive optical network (PON), such as higher data transmission rates, wider coverage and lower latency [1]. Traditional PONs are based on intensity modulation and direct detection (IM/DD) in the physical layer, but the sensitivity, power prediction, and limited transmission rate of O-band IM/DD PON cannot meet the needs. Therefore, the C-band coherent PON can be most favorable candidate for the challenges [2]. Compared with the IM/DD system, the coherent PON provides faster data rate, gains adequate power budget with a modest transmitting power and enables the efficient utilization of digital signal processing (DSP) algorithms [3]. Additionally, more flexibilities are enabled by coherent PON, i.e., frequency division multiplexing (FDM), for multi-user access [4].