It is one of the most commonly used and cost-effective line-side protection solutions in Optical Transport Networks (OTN), DWDM, PTN/SDH, and other optical networks. OLP is widely regarded as the “automatic fuse” for optical fibers. OLP systems provide monitoring of primary and secondary optical fibers in real-time, effectively avoiding the simultaneous blocking of two optical fibers. A single fiber break, equipment fault or significant attenuation can interrupt services and erode business continuity. Yet, outdoors, they face temperature swings, moisture, UV exposure, rodents, and human interference. When the fiber attenuation of the transmission line becomes large or the fiber accidentally breaks, leading to communication quality degradation or communication. To achieve “zero interruption” or “sub-second recovery” for optical lines, the industry has introduced OLP (Optical Line Protection) technology.
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