Time and reference frequency transfer over 850 nm VCSEL for digital telecommunication network synchronization

作     者：G.M.Isoe S.Wassin A.W.R.Leitch T.B.Gibbon 

作者机构：Centre for Broadband CommunicationNelson Mandela University 

出 版 物：《Optoelectronics Letters》 (光电子快报（英文版）)

年 卷 期：2019年第15卷第3期

页      面：209-212页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 081001[工学-通信与信息系统] 0702[理学-物理学] 

主　　题：VCSEL 

摘      要：Accurate time transfer and synchronization between different network nodes is a key functional requirement in digital communication. Developments in optical fiber-based frequency dissemination techniques have improved optical frequency stability over time to much lower levels. In this work, we experimentally present the reference frequency transfer employing 850 nm vertical cavity surface emitting laser(VCSEL) over 100.3 m OM3 multimode fiber for synchronization of clocks on networked devices such as servers and racks/pod at different data center network nodes. A low-cost power-efficient multimode VCSEL with central wavelength at 844.26 nm is directly modulated with a 2 GHz reference frequency(RF) clock signal, and transferred over 100.3 m of OM3 multimode fiber. The single side band(SSB) phase noise of-104.62 dBc/Hz and-100.70 dBc/Hz is experimentally measured at back-to-back(B2 B) and 100.3 m OM3 multimode fiber transmission respectively at a 1 kHz frequency offset. The jitter stability of 0.14 ps and 0.15 ps is experimentally achieved at B2 B and 100.3 m fiber transmission, respectively. This work provides an alternative viable approach for the development of time keeping devices in high-speed short-reach optical communication systems.