The single-fiber optical module has only one optical fiber port, and only one optical fiber can be inserted to transmit and receive optical signals at the same time. Let's explore it in details as follows: 1. Structure and Interface Single fiber SFP module: It is also called bidi sfp module. Choosing between a 100G single-fiber (BiDi) and a dual-fiber optical module is a critical decision in network design, directly impacting cost, fiber resource utilization, and application suitability. How do we choose, and what are their differences and advantages? Let's learn about this! What is a Single-Fiber (BiDi) Transceiver? Single fiber module also called BiDi transceiver or WDM module. The dual type has two ports, while the single type has just one.