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Under the influence of the "Internet+" strategy, the internet has become the infrastructure of various industries, and the issue of data transmission reliability is increasingly getting attention. With the rapid expansion of the internet, the protection of fiber optic lines has become a top priority. In recent years, accidents caused by municipal road construction digging up fiber optic cables have been frequent, resulting in large-scale network failures. For example, in 2013, a certain instant messaging service experienced a seven-hour outage due to a fiber optic cable break. Similarly, a recent payment platform also faced widespread payment service interruptions because of municipal construction accidentally cutting the fiber optic cable. These incidents all warn us that the protection of fiber optic lines must be sufficiently emphasized.
To address the issue of fiber optic line interruptions, multiple fiber optic line protection technologies are currently in place. Common ones include optical multiplex section protection, optical self-healing ring protection, and optical line automatic protection (OLP) technology. However, the first two have certain limitations. Optical multiplex section protection can protect the entire optical multiplex section, but it cannot protect each segment of the optical line (such as from the terminal station to OA station, from OA station to OA station). Additionally, using 1+1 protection generally incurs high insertion loss, affecting system performance. Optical self-healing ring protection, though capable of rerouting through the ring structure of the network, requires a large amount of reserved bandwidth, leading to high investment costs and compatibility issues between different manufacturers' equipment.
In contrast, OLP protection technology is simpler and more efficient. OLP protection devices can quickly switch from the primary route to the backup route in case of an optical cable break, preventing network failures caused by optical cable interruptions. In the field of fiber optic line protection, the application of OLP protection is becoming increasingly widespread, becoming an important means to ensure stable network operation.
OLP protection devices's greatest advantage lies in its efficient switching capability. By connecting to two different routes via an optical switch, OLP devices can switch to the backup route within 30 milliseconds when the primary optical cable deteriorates, ensuring uninterrupted network service. The OLP network also features independent network management functions, enabling real-time monitoring of the optical cable's attenuation as well as the device's transmission and reception power. They can send SMS notifications to the relevant personnel if anomalies are detected, facilitating a timely response.
Additionally, OLP protection technology incurs low insertion losses on the original line, generally less than 3dB, with high-quality OLP achieving insertion losses below 1dB. This means that when optical cable issues arise, OLP devices can not only switch quickly but also minimize impact on the system. Since OLP protection technology has no special requirements for equipment manufacturers or system rates, it boasts high compatibility and can protect systems with different rates and from different manufacturers, such as SDH/PTN, DWDM/OTN, etc. Whether it's a GE, 10G, 40G, or 100G system, OLP protection can provide stable and reliable protection.
In today's era of increasing data transmission demands, the protection of fiber optic lines is crucial. OLP protection technology, with its fast switching, low insertion loss, and high compatibility, has already become the "guardian" of fiber optic line protection. As the internet continues to develop, OLP protection will play an increasingly important role in future optical communication networks, ensuring the reliability and stability of data transmission.
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