First demonstration of C + L band CDCROADM with simple node configuration using multiband switching devices

TL;DR

This paper demonstrates a C + L band CDC-ROADM node using multiband switching devices, addressing bandwidth and configuration challenges in high-capacity optical networks through experimental validation.

Contribution

It introduces a simplified C + L band CDC-ROADM node with multiband switches and reduced optical amplifiers, enhancing flexibility and ease of operation.

Findings

Successful experimental validation of the proposed node design.

Reduction in optical amplifiers is feasible for loss compensation.

Multiband switches effectively address bandwidth and configuration challenges.

Abstract

While ultrahigh-baud-rate optical signals are effective for extending the transmission distance of large capacity signals, they also reduce the number of wavelengths that can be arranged in a band because of their wider bandwidth. This reduces the flexibility of optical path configuration in reconfigurable optical add/drop multiplexing (ROADM) networks. In colorless, directionless and contentionless (CDC)-ROADM in particular, the effect reduces the add/drop ratio at a node. Multiband ROADM systems are an effective countermeasure for overcoming this issue, but they make the node configuration more complicated and its operation more difficult. In this paper, we analyze the challenges of C + L band CDC-ROADM and show that optical switch devices that operate over multiple bands are effective in meeting them. For this purpose, we built a C + L band CDC-ROADM node based on C + L band wavelength selective switches (WSSs) and multicast switches (MCSs) and confirmed its effectiveness experimentally. In particular, to simplify the node configuration, we propose a reduction in the number of optical amplifiers used for node loss compensation and experimentally verify its feasibility.