Since the receiver sensitivity of 100GBASE-ER is not satisfied with the existing APD technology, the SOA size is too large for the QSFP28 series.
ນັບຕັ້ງແຕ່ຄວາມໄວ sensitivity ຂອງ 100GBASE-ER ບໍ່ພໍໃຈກັບເຕັກໂນໂລຢີ APD ທີ່ມີຢູ່, ຂະຫນາດ SOA ແມ່ນຂະຫນາດໃຫຍ່ເກີນໄປສໍາລັບຊຸດ QSFP28.