1. 1）IEEE Standard for Ethernet, IEEE Standard 802.3-2018, 2018.
2. 2）10-Gigabit-Capable Passive Optical Networks (XG-PON)，
ITU-T Recommendation G.987 Series, 2010.
3. 3）10-Gigabit-Capable Symmetric Passive Optical Networks (XGSPON),
ITU-T Recommendation G.9807 Series, 2017.
4. 4）M. Fujiwara, T. Imai, K. Taguchi, K. Suzuki, H. Ishii, and N.
Yoshimoto: J. Lightwave Technol. 31 (2013) 634.
5. 5）I. Yang, N. Suzuki, T. Suehiro, J. Nakagawa, and T. Mizuochi:
Proc. Opt. Fiber Commun. Conf./Nat. Fiber Opt. Eng. Conf.
(2012) OM3I.2.