Abstract
At the lowest layer of today's communication networks is an optical line system (OLS), a physical network of equipment, which carries high-frequency analog light signals over thousands of kilometers. Traditionally, an OLS was delivered as a turn-key solution by a single vendor. Within an OLS, reconfigurable optical add/drop multiplexers (ROADMs) are active devices responsible for routing spectral chunks between input and output ports. ROADMs are arguably the most complex physical component of an OLS. In this paper, we describe an open design of a Czech Light ROADM, including the optical hardware, electronics, software, and the northbound communication interface. The performance of the ROADMs is evaluated in two test scenarios.
Highlights
O PTICAL Line Systems (OLS) provide infrastructure which carries optical signals over long distances and build the core of today’s Internet
This paper presents a comprehensive description of how one possible reconfigurable optical add/drop multiplexers (ROADMs) design can be built in an open manner using components which are available for procurement in small-quantities
The Device portion of OpenROADM YANG models focuses on ROADMs with a local controller, something which is hard to support in a disaggregated design of the ROADM node itself which consists of separate ROADM units, each with its own instance of a local operating system
Summary
O PTICAL Line Systems (OLS) provide infrastructure which carries optical signals over long distances and build the core of today’s Internet. Reconfigurable Optical Add-Drop Multiplexers (ROADM) are a key building block [1]. These devices are located within the network nodes, and they route chunks of optical spectrum among fiber directions, filtering, attenuating and amplifying the optical signals as they travel through. This paper presents a comprehensive description of how one possible ROADM design can be built in an open manner using components which are available for procurement in small-quantities. CESNET, a Czech research and education network, has been working on individual components of an OLS system under the Manuscript received December 13, 2018; revised March 4, 2019 and March 18, 2019; accepted March 18, 2019. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org.
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