Crosstalk reducing variable optical attenuator based on cosine s - bend waveguide / by Ian Yulianti, author, Sevia Mahdaliza Idrus Sutan Nameh, author, Abu Samah M. Supa'at, author, Abdulaziz Mohammed Ali Al-Hetar, author, International Conference on Science and Technology : Application in Industry and Education (2008 : Pulau Pinang)