10.1364/OE.22.004692.m002 Yasushi Takahashi Yasushi Takahashi Takashi Asano Takashi Asano Daiki Yamashita Daiki Yamashita Susumu Noda Susumu Noda Media 2: Ultra-compact 32-channel drop filter with 100 GHz spacing Optica Publishing Group 2014 100 GHz spacing media oe 24 February 2014 32- filter Optics Express Ultra-compact 2014-02-24 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_2_Ultra-compact_32-channel_drop_filter_with_100_GHz_spacing/4947854 Originally published in Optics Express on 24 February 2014 (oe-22-4-4692)