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01 Apr 2016

With the rapid development of fiber optic communications, fiber optic cables have become an indispensable component for each data center. They’re playing an important part in transmitting data at fast and reliable speed. Yet many router jockeys don’t get enough exposure to fiber cabling, which leads to a wide variety of confusion, misconceptions, and errors when working with fiber optic networks. The purpose of this post is to help you get an in-depth understanding of these topics related to data center fiber cabling.

Data Centers

Basic Knowledge About Fiber

Fiber cables are internally composed of two layers, the “core” and the “cladding”. They can be classified into two main types: single mode fiber (SMF) and multimode fiber...

31 Mar 2016
What is Mode Conditioning Patch Cable?

Mode conditioning patch cable, also called mode conditioning patch cord (MCP), is a duplex multimode patch cable that has a small length of single mode fiber at the start of the transmission length. Designed to "condition" the laser launch and obtain an effective bandwidth closer to that measured by the overfilled launch method, the MCP allows for laser transmitters to operate at gigabit rates over multimode fiber without being limited by Differential Mode Delay (DMD). The point is to excite a large number of modes in the fiber, weighted in the mode groups that are highly excited by overfill launch conditions, and to avoid exciting widely separated mode groups with similar power levels. This is...

23 Mar 2016

With the deployment of 40G systems in the data center, a lot of confusion occurred like: can the switches support such a high speed Ethernet? Can the optical transceivers be compatible with the switches? Which kind of optical transceiver is more cost-efficient? In order to solve these questions, the first and foremost thing is to know the most appropriate kind of fiber optic patch cable for the 40G QSFP+ transceiver (Quad Small Form-factor Pluggable transceiver) in the 40G connections.

As we all know, to accomplish the connections between these switches, fiber optic patch cord is usually linked to fiber optic transceivers which are plugged in Ethernet switches (as shown in the following picture). The quality of these connections has...

23 Sep 2015

As the use of fiber in premise networks continues to grow, so do the requirements for testing and certifying it. An optical time-domain reflectometer (OTDR) is an optoelectronic instrument in the characterization and certification of fiber-optic links (multi-mode and single-mode LAN/Ethernet). When choosing an OTDR, it is important to select the specific OTDR performance and features according to the required specification to qualify these links accurately. This article describes the key specifications that should be considered when choosing an OTDR.


Dynamic Range

This specification determines the total optical loss that the OTDR can analyze, that is to say, the overall length of fiber link can be measured by the OTDR. The higher...