Сообщение

Application of Reconfigurable Optical Add / Drop Multiplexers in DWDM Networks

 
 orcid Maria Bylina, orcid Alexandra Shevtsova

The Bonch-Bruevich Saint Petersburg State University of Telecommunications,
St. Petersburg, 193232, Russian Federation

DOI 10.31854/2307-1303-2026-14-1-68-85

EDN MQPIJB

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Abstract

Background. Modern OTN-DWDM optical transport networks have complex topologies, with more than one route between any two network nodes. Dynamic optical routing of spectral channels is required for flexible network management and to ensure reliable and uninterrupted operation. Spectral channel routes in OTN-DWDM networks are created using optical add / drop multiplexers (OADMs). Passive OADMs, based on optical filters, do not allow route changes without physical equipment replacement. Therefore, reconfigurable OADMs (ROADMs) are used in modern networks, enabling dynamic channel rerouting. Purpose. To qualitatively assess the effectiveness and feasibility of using ROADMs in OTN-DWDM networks based on a comparative analysis of their structural diagrams and architectures. Results. The operating principles and structural diagrams of ROADMs and their main components--wavelength-selective switches (WSS)--for DWDM networks using fixed and flexible spectral channel grids are examined. A comparative analysis of ROADM architectures (Colored, Colorless, Directionless, Contentionless, Broadcast-and-Select, Route-and-Select) is conducted. Recommendations for selecting a ROADM architecture for an OTN-DWDM transport network are provided. Practical relevance. The proposed recommendations for selecting a ROADM architecture can be used in the design and modernization of OTN-DWDM networks to reduce operating costs and improve network resilience.

Keywords

dense wavelength division multiplexing DWDM, optical transport network OTN, reconfigurable optical add / drop multiplexer ROADM, wavelength-selective switch WSS, Colorless Directionless Contentionless ROADM, broadcast-and-select architecture, Route-and-Select architecture

Reference for citation

Bylina M., Shevtsova A. Application of Reconfigurable Optical Add / Drop Multiplexers in DWDM Networks // Telecom IT. 2026. Vol. 14. Iss. 1. PP. 68‒85. (in Russian). DOI: 10.31854/2307-1303-2026-14-1-68-85. EDN: MQPIJB
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