- 강사 : 조준호 박사(Nokia Bell Labs)
- 일시 : 2017년 08월 16일 (수) 오전 10시30분
- 장소 : 서울대학교 뉴미디어통신공동연구소 1층 대회의실
Coding and modulation are two key elements to approach the Shannon limit. As forward-error correction has become indispensable for communications, probabilistic constellation shaping (PCS) is becoming the next essential element. We review the recent advances in rate-adaptable optical fiber communications based on probabilistic constellation shaping. We then report the transmission of probabilistically shaped (PS) 64-ary quadrature amplitude modulation at 7.46 b/s/Hz over a 5,523-km in-service trans-Atlantic fiber-optic cable. Using a looped-back system configuration, we achieve 5.68 b/s/Hz over a trans-Pacific-equivalent distance of 11,046 km. Net spectral efficiencies are increased by 18% and 80% by using PS, at 5,523 km and 11,046 km, respectively, compared to uniform square QAM.
Junho cho received the B.S.(2004), M.S.(2006), and Ph.D.(2010) in electrical engineering and computer science from seoul National Univ., Seoul, Korea. He was a Member of Technical Staff at Bell Labs, Alcatel-Lucent, Seoul, Korea from 2010 to 2014, and has been with Bell Labs, Nokia, Holmdel, NJ, USA since 2014. Dr. Junho Cho has published over 41 papers in international journals and conferences. He holds or filed 3 Korean patents and 4 US patents. He set record capacity-distance results using probabilistic constellation shaping (2016), and record capacities in a submarine field trial together with Facebook (2017)
https://www.engadget.com/2017/03/21/facebook-and-nokia-speed-up-undersea-fiber/]. While at Seoul National University, he received the 2009 Outstanding Research Award under the Brain Korea 21 Project. He received the Outstanding Reviewer Award, IEEE/OSA Journal of Lightwave Technology, 2017.