Optical Phased Array Using Multi Dither Heterodyning Technique for Receiving Optical Beam Former

Eisuke HARAGUCHI  Hitomi ONO  Junya NISHIOKA  Toshiyuki ANDO  Masateru NAGASE  Akira AKAISHI  Takashi TAKAHASHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E99-B    No.10    pp.2128-2135
Publication Date: 2016/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016ATP0006
Type of Manuscript: Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2015)
Category: 
Keyword: 
OBF,  optical phase locked loop,  optical down-conversion,  satellite communications,  

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Summary: 
To provide a satellite communication system with high reliability for social infrastructure, building flexible beam adapting to change of communication traffic is necessary. Optical Beam Forming Network has the capability of broadband transmission and small light construction. However, in space environment, there are concerns that the reception efficiency is reduced by the relative phase error of receiving signal among antenna elements with temperature fluctuation. To prevent this, we control relative phase among received signals with optical phase locked loop. In this paper, we propose the active optical phased array system using multi dither heterodyning technique for receiving OBF, and present experimental results under temperature fluctuation. We evaluated the stability of relative phase among 3 elements for temperature fluctuation at multiplexer from -15 to 45℃, and checked the stability of PLL among 3 elements.