Dispersion management solves a light problem

Both system vendors and carriers have struggled with the performance limitations created by chromatic dispersion. Now, they have a solution.

In migrating to advanced optical networks, both system vendors and carriers have struggled with the performance limitations created by chromatic dispersion.

One solution is to use Hi-Mode dispersion management devices (DMDs), from US-based LaserComm which will be demonstrated for the first time at the Optical Fiber Conference (OFC) held from March 17-22 in Anaheim, CA. LaserComm will be showing both its C-band and L-band versions.

Chromatic dispersion is the natural broadening of light pulses as they travel through optical fibre. As the pulses spread, they begin to overlap, causing bit errors when the receiver is unable to differentiate between pulses.

This presents a major barrier to expanding network capacity as it drastically limits the speed, distance and channel density of optical networks. Because the rate of dispersion is unique for every channel, managing dispersion slope is key to transmitting data in multi-channel DWDM systems.

Any increase in the DWDM channel count or data rate greatly magnifies the effects of chromatic dispersion. Therefore, precise chromatic dispersion and dispersion slope management is needed by system manufacturers and carriers to increase bit rates to 10 and 40 Gb/s, expand to 160 channels or more and boost optical link distances to thousands of kilometres.

Measurements taken throughout the event will demonstrate the Hi-Mode DMD’s precise chromatic dispersion and dispersion slope management for typical spans of NZDSF – the fibre type currently deployed in new advanced long-haul and ultra long-haul optical networks.

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