Ultra high quality mode conditioning patch cables for Gigabit Ethernet applications are required where Gigabit 1000 Base-LX routers and switches are installed into existing multimode cable plants. We offer Mode Conditioning cables in all varieties and combinations of SC, ST, MT-RJ and LC in 62.5/125 and 50/125.
All our mode conditioning cables are proudly made in the USA and come with individual test results! Lead times vary, but are usually about 2-3 business days for production. Click on the configurations below for pricing and to purchase.
The launch of the light coming out of the equipment begins on a Singlemode fiber. The Singlemode fiber is precision fusion spliced to the multimode fiber to a precise core alignment (see fig. 1). The light is launched on to the multimode fiber at a precise angle, giving the cable its mode conditioning properties. Looking at the mode conditioning cable assembly in figure 2, we can see that the fusion splice this protected by a black over-wrap. notice that on the right side there is an orange and a yellow cable. This is the side of the cable that connects to the gigabit equipment with the yellow Singlemode leg connecting to the transmit side.
All of our mode conditioning cables are custom made to order . By industry standards, our lead times are very short . The lead time will vary according to the quantity desired , and the production load at the time of the order. Average lead times are as follows:
1 - 2 days for orders of 1 to 12 cables,
3 - 5 days for orders of 12 to 40 cables,
1 week for orders of 40 to 100+ cables.
Note: MT-RJ and MU cables may have higher lead times.
The great demand for increased bandwidth has prompted the release of the 802.3z standard (IEEE) for Gigabit Ethernet over optical fiber. 1000Base-LX requires the use of a launch conditioning patch cord to allow for proper propagation of the laser VCSEL light along the multimode fiber.
The Mode Conditioning Patch Cord is designed for long wave (-LX) multimode applications of Gigabit Ethernet. It is compliant with this IEEE 802.3z application standard. This patch cord consists of duplex SC connectors on each end of a cable assembly with a single-mode fiber offset to a multimode fiber connection point in between.
The need for this patch cord is due to the single-mode launch nature of the -LX or long-wave (1300 nm) transceiver modules used for Gigabit Ethernet. These modules have to operate for both single-mode and multimode fibers. Launching a single-mode laser into the center of a multimode fiber can cause multiple signals to be generated that confuse the receiver at the other end of the fiber. These multiple signals, caused by Differential Mode Delay (DMD) effects, severely limit the cable distance lengths for operating Gigabit Ethernet. A mode conditioning patch cord eliminates these multiple signals by allowing the single-mode launch to be offset away from the center of a multimode fiber. This offset point creates a launch that is similar to typical multimode LED launches.
Disclaimer: We have provided this article as general installation advice to our customers. We make no claims about the completeness or the accuracy of the information as it may apply to an infinite amount of field conditions. It is the responsibility of the person or persons using this information to check with all concerned parties, owners and local authorities, etc. before doing an installation. Users of this information agree to hold Atcom Inc. harmless form liabilities of any kind relating to the use of this information.