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A half\u2010duplex, decode\u2010and\u2010forward, two\u2010way, optical relay is considered, which establishes communication between two terminals, when direct communication is not possible because of non line\u2010of\u2010sight propagation or large distance. For the presented system and channel models and considering heterodyne detection at the receiver, we formulate the statistics of the instantaneous signal\u2010to\u2010noise ratio, followed by calculation of exact analytical expressions of capacity and BER. The mathematical expressions are formulated in terms of easily computable Meijer's G\u2010function. This mathematical analysis is accompanied with several numerical examples to illustrate the effect of the key system parameters. Copyright \u00a9 2015 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/dac.3027","type":"journal-article","created":{"date-parts":[[2015,7,30]],"date-time":"2015-07-30T10:44:46Z","timestamp":1438253086000},"source":"Crossref","is-referenced-by-count":5,"title":["Bi\u2010directional relay\u2010assisted FSO communication systems over strong turbulence channels with pointing errors"],"prefix":"10.1002","volume":"30","author":[{"given":"Parul","family":"Puri","sequence":"first","affiliation":[{"name":"Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology  New Delhi, India"}]},{"given":"Parul","family":"Garg","sequence":"additional","affiliation":[{"name":"Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology  New Delhi, India"}]},{"given":"Mona","family":"Aggarwal","sequence":"additional","affiliation":[{"name":"Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology  New Delhi, India"}]}],"member":"311","published-online":{"date-parts":[[2015,7,30]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/MCOM.2004.1299334"},{"issue":"11","key":"e_1_2_7_3_1","doi-asserted-by":"crossref","first-page":"3416","DOI":"10.1002\/dac.2550","article-title":"High efficiency wireless optical links in high transmission speed wireless optical communication networks","volume":"27","author":"Rashed ANZ","year":"2013","journal-title":"Wiley International Journal of Communication Systems"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2006.885252"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1364\/OL.28.000129"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2009.2022771"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1364\/OE.20.012550"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1117\/1.1386641"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2002.800829"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2014.2330594"},{"issue":"11","key":"e_1_2_7_11_1","first-page":"1149","article-title":"Outage performance of DF relay\u2010assisted FSO communications using time diversity","volume":"27","author":"Castillo\u2010Vazquez C","year":"2015","journal-title":"IEEE Photonics Technology Letters"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1109\/JPHOT.2015.2417867"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1109\/JLT.2007.899174"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1109\/98.799621"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1109\/T-WC.2008.071352"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1049\/iet-com.2009.0335"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1109\/TCOMM.2011.121410.100032"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1364\/JOCN.5.001032"},{"key":"e_1_2_7_19_1","article-title":"Analysis of spectrally efficient two\u2010way relay assisted free space optical systems in atmospheric turbulence with path loss","author":"Puri P","year":"2014","journal-title":"Wiley International Journal of Communication Systems"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1109\/LPT.2014.2333032"},{"key":"e_1_2_7_21_1","unstructured":"PuriP ChatzidiamantisND GargP AggarwalM KaragiannidisGK.Maximizing the achievable sum\u2010rate of FSO networks via two\u2010way relay selection. 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