A single fiber optical transceiver, known as Bidi transceiver, allows bidirectional communication over a single optical fiber. This design uses two different wavelengths for transmitting and receiving signals. It offers high bandwidth, low signal loss, and resistance to electromagnetic interference (EMI), making it ideal for modern high-speed networks. FTTH has grown since the 1980s to. The single-mode optical fiber is designed and engineered to carry one single light mode in a minimal core diameter. One of the greatest advantages is its bandwidth. Because of the wavelength of light, it is possible to transmit a signal that contains considerably more information than is possible with a metallic. Fiber optics has revolutionized the way we transmit data.