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First demonstration of a C + L band CDC-ROADM with a simple node configuration using multiband switching devices
Optics Express
|November 23, 2021
Summary
Ultrahigh-baud-rate signals in colorless, directionless, and contentionless (CDC)-ROADM networks limit wavelength capacity. This study demonstrates C+L band CDC-ROADM using multi-band switches simplifies node configuration and improves performance.
Area of Science:
- Optical communication networks
- Telecommunications engineering
- Photonics
Background:
- Ultrahigh-baud-rate optical signals increase transmission distance but reduce wavelength capacity due to wider bandwidth.
- This bandwidth limitation impacts flexibility in reconfigurable optical add/drop multiplexing (ROADM) networks, especially in colorless, directionless, and contentionless (CDC)-ROADM architectures, reducing the add/drop ratio.
- Multiband ROADM systems address capacity issues but increase node complexity and operational difficulty.
Purpose of the Study:
- To analyze the challenges of C+L band CDC-ROADM systems.
- To demonstrate the effectiveness of multi-band optical switch devices for C+L band CDC-ROADM.
- To propose and verify a simplified node configuration for C+L band CDC-ROADM by reducing optical amplifiers.
Main Methods:
- Analysis of C+L band CDC-ROADM challenges.
- Development of a C+L band CDC-ROADM node utilizing C+L band wavelength-selective switches and multicast switches.
- Experimental validation of the proposed node design and simplified configuration.
Main Results:
- Optical switch devices operating over multiple bands are effective for C+L band CDC-ROADM.
- A C+L band CDC-ROADM node was successfully built and experimentally verified.
- A reduction in the number of optical amplifiers for node loss compensation was proposed and its feasibility confirmed, simplifying node configuration.
Conclusions:
- Multi-band optical switches are crucial for overcoming bandwidth limitations in advanced ROADM networks.
- The developed C+L band CDC-ROADM node effectively addresses capacity and flexibility challenges.
- Simplified node configurations, including reduced optical amplifier usage, are feasible and beneficial for future ROADM deployments.
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