SC-SC Type: Known as square to square tail fiber, often used for interconnecting optical boards between devices. Utilized in Huawei OSN series, ZTE S series devices, and earlier Lucent. Bynet Square Tail Fiber Pigtail is a precision-engineered optical component designed for high-accuracy light coupling, micro-optical device integration, and fiber-optic sensing systems. They are. FS fiber optic pigtails offer a fast way to make fiber optic communication devices in the field by fiber splicing, fully manufactured and tested by industrial standards. The differences between LC, ST, and SC connectors are crucial for various applications in networking.