Coherent optics have been the go-to solution for high-end optical transport systems for years. Eventually these optics were modularized and with recent advances in DSP design and optics manufacturing, this technology is now available in small form factor pluggable modules. Cisco recognized the importance of this technology and acquired the industry’s leader in this space, Acacia Communications in March of 2021. In Episode 23, we continue our conversation with Tom Williams, Director of Technical Marketing, who joined Cisco via the Acacia acquisition. We talk about fundamental limits of communication and then get into standards. – Pat Chou, Cisco Optics Product Manager Tom Williams leads marketing efforts for the Acacia coherent optics team that was acquired by Cisco in March 2021. Tom has spent over 20 years developing optical transmission equipment ranging from 10G to 1.2T. He participates in a variety of coherent standardization activities in OIF, IEEE and Open ROADM and is co-chair of the OpenZR+ MSA. Tom spent nearly 15 years in various management roles at Optium, where he participated in the company’s 2006 IPO and 2008 acquisition by Finisar. Tom joined Acacia in 2015, where his role has included corporate and product marketing responsibility, as well as contributing to product roadmap definitions. Related links Cisco Optics-to-Device Compatibility Matrix: https://tmgmatrix.cisco.com/ Cisco Optics-to-Optics Interoperability Matrix: https://tmgmatrix.cisco.com/iop Cisco Optics Product Information: https://copi.cisco.com/ Additional resources Cisco Optics Podcast: https://blogs.cisco.com/tag/ciscoopticspodcast Cisco Optics blogs: https://blogs.cisco.com/tag/ciscoopticsblog (subscribe at https://feedburner.google.com/fb/a/mailverify?uri=CiscoOpticsBlog ) Cisco Optics YouTube playlist: http://cs.co/9008BlQen Cisco Optics landing page: cisco.com/go/optics Timestamps 2:24 Addressing upper limits in data rate 3:45 The Shannon limit 4:11 Maximizing capacity within channel bandwidth 8:33 Application dependent trade-offs 9:32 Standards for coherent optics (e.g. 400G ZR) 14:18 Standardizing pluggable coherent optics Music credits Sunny Morning by FSM Team | https://www.free-stock-music.com/artist.fsm-team.html Upbeat by Mixaund | https://mixaund.bandcamp.com