Two books providing specialized knowledge on optical fiber communication and optical devices: - Title: Introduction to Optical Fiber Communication (Revised 3rd Edition) - Authors: Yasuharu Suematsu, Kenichi Iga - Publisher: Ohmsha - Title: Optical Devices - Author: Yasuharu Suematsu - Publisher: Corona Publishing Co., Ltd. Both books have some minor scuff marks on the covers, but the contents are in good condition. Please check the photos. We are looking forward to your purchase if you understand that these are used items stored by a private individual.