LCOS-based flexible grid 1 exttimes40 wavelength selective switch using planar lightwave circuit as spot size converter - Masaki Iwama; Masanori Takahashi; Masayoshi Kimura; Yasuyoshi Uchida; Junichi Hasegawa; Ryo Kawahara; Nobuvuki Kagi (Optical Fiber Communications Conference and Exhibition, OFC 2015, Los Angeles, CA, USA, March 22-26, 2015, 2015)