Low-PDL 16-channel variable optical attenuator array using silica-based PLC

@article{Hashizume2004LowPDL1V,
  title={Low-PDL 16-channel variable optical attenuator array using silica-based PLC},
  author={Yasuaki Hashizume and Yasuyuki Inoue and Toshimi Kominato and Tomohiro Shibata and Masayuki Okuno},
  journal={Optical Fiber Communication Conference, 2004. OFC 2004},
  year={2004},
  volume={1},
  pages={609-}
}
We successfully reduced the PDL of a silica-based PLC-VOA array at an attenuation of 15 dB to 0.3 dB by forming stress-releasing grooves and by employing a cross-path in an asymmetric Mach-Zehnder interferometer.