1. Mina Paik, "4 Things we learned at #OFC17", March 30, 2017, http://www.ciena.com/insights/articles/4-Things-We-Learned-at-OFC17.html
2. Fujitsu Network Communications Inc.,"CDC ROADM applications and cost comparison", whitepaper, 2014, https://www.ofcconference.org/getattachment/188d14da-88ba-4a63-91d6-1cc14b335d8b/CDC-ROADM-Applications-and-Cost-Comparison.aspx
3. Nokia, "Benefits of CDC-F ROADMs", whitepaper, 2017, https://knect365.com/ngon/article/e081ea00-9bc9-433d-ae21-94617299be41/whitepaper-benefits-of-cdc-f-roadms
4. Huawei Technologies Co., Ltd., "white paper on technological developments of optical networks", whitepaper, 2016, http://www-file.huawei.com/-/media/CORPORATE/PDF/white%20paper/White-Paper-on-Technological-Developments-of-Optical-Networks.pdf
5. Sterling Perrin, "Building a fully flexible optical layer with next-generation ROADMs", heavy reading whitepaper, 2011, http://www-file.huawei.com/-/media/CORPORATE/PDF/white%20paper/White-Paper-on-Technological-Developments-of-Optical-Networks.pdf