Bidirectional traffic on a single fiber, commonly referred to as BiDi, is a technology that enables data transmission in both directions using a single fiber optic cable. These devices are present in telephone and intercom systems. An example is this device which provides two zero-latency analog audio channels plus a 10/100 Ethernet port over. In contrast, bidirectional transmission enables simultaneous data exchange in both directions within a single optical fiber, using different wavelengths to separate the two directions of communication. Bidirectional communication has emerged as an effective solution for reducing fiber usage while. I've always thought of a fiber connection as two strands going in either direction, but just learned that you can also have bidirectional traffic over a signal strand by shooting 1550nm one way and 1310 the other. Multimode fiber transmits multiple light modes, suitable for shorter distances due to dispersion and attenuation. Together, the two fibers form a full-duplex channel, but each fiber itself is strictly one-way.
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