1. H.Masuda E.Yamazaki A.Sano T.Yoshimatsu T.Kobayashi E.Yoshida Y.Miyamoto S.Matsuoka Y.Takatori M.Mizoguchi K.Okada K.Hagimoto T.Yamada andS.Kamei in:Tech. Digest of OFC/NFOEC 2009 paper PDPB5 San Diego March 2009.
2. K.Yonenaga F.Inuzuka S.Yamamoto H.Takara B.Kozicki T.Yoshimatsu A.Takada andM.Jinno in:Tech. Digest of OFC/NFOEC 2009 paper OWM1 San Diego March 2009.
3. Y.Miyamoto in:Proceedings of ECOC 2009 paper 10.3.3 Vienna Sept. 2009.
4. X.Zhou J.Yu M.‐F.Huang Y.Shao T.Wang L.Nelson P.Magill M.Birk P. I.Borel D. W.Peckham andR.Lingle in:Tech. Digest of OFC/NFOEC 2010 PDPB9 San Diego March 2010.
5. A.Sano H.Masuda T.Kobayashi M.Fujiwara K.Horikoshi E.Yoshida Y.Miyamoto M.Matsui M.Mizoguchi H.Yamazaki Y.Sakamaki andH.Ishii in:Tech. Digest of OFC/NFOEC 2010 Paper PDPB7 San Diego March 2010.