Abstract

Colorless, directionless, and contentionless reconfigurable optical add/drop multiplexing (CDC-ROADM) provides highly flexible physical layer network configuration. Such CDC-ROADM must operate in multiple wavelength bands which are being increasingly implemented in optical transmission systems. The operation in C+L bands requires switch devices used in CDC-ROADM to also be capable of multiband operation. Recent studies on wavelength division multiplexing (WDM) systems have pointed out the impact of amplified spontaneous emission (ASE) noise generated by signals of different wavelengths, which causes OSNR degradation. Therefore, it is desirable to filter out the ASE noise from different transponders when multiplexing multiple wavelengths at the transmitter side, especially in a system with non-wavelength selective combiners such as directional couplers and multicast switches. The use of transponder aggregators with filtering functions, such as the M × N wavelength selective switch (WSS), is preferable for this filtering. However, the downside of these devices is that it is difficult to provide economical multiband support. Therefore, we propose an economical transponder aggregator configuration by allowing a certain amount of ASE superposition and reducing the number of filtering functions. In this paper, we fabricated a prototype of the proposed transponder aggregator by combining silica-based planar lightwave circuit technology and C+L band WSS, both commercially available, and verified its feasibility through transmission experiments. The novel transponder aggregator is a practical solution for a multiband CDC-ROADM system with improved OSNR performance.

First demonstration of a C + L band CDC-ROADM with a simple node configuration using multiband switching devices

Shuto Yamamoto, Hiroki Taniguchi, Yoshiaki Kisaka, Stefano Camatel, Yiran Ma, Daisuke Ogawa, Koichi Hadama, Mitsunori Fukutoku, Takashi Goh, and Kenya Suzuki
Opt. Express 29(22) 36353-36365 (2021)

Low-Cost CDC ROADM Architecture Based on Stacked Wavelength Selective Switches

Haining Yang, Brian Robertson, Peter Wilkinson, and Daping Chu
J. Opt. Commun. Netw. 9(5) 375-384 (2017)

Demonstration of Quasi-Contentionless Flexible ROADM Based on a Multiport WXC

Liangjia Zong, Han Zhao, Yunfei Yan, and Zhiyong Feng
J. Opt. Commun. Netw. 8(7) A141-A151 (2016)

Experimental demonstration of multi-degree colorless, directionless, contentionless ROADM for 127-Gbit/s PDM-QPSK transmission system

Yohei Sakamaki, Takeshi Kawai, Tetsuro Komukai, Mitsunori Fukutoku, Tomoyoshi Kataoka, Toshio Watanabe, and Yuzo Ishii
Opt. Express 19(26) B1-B11 (2011)

Colorless, partially directionless, and contentionless architecture for high-degree ROADMs

Yongcheng Li, Jieming Lin, Liangjia Zong, Sanjay K. Bose, Biswanath Mukherjee, and Gangxiang Shen
J. Opt. Commun. Netw. 14(6) 481-492 (2022)