Infinera (News - Alert), a provider of digital optical communications systems, announced the release of a published paper showing the results of achievement for real-time polarization mode dispersion (PMD) performance, with Infinera's coherent optical transmission based on 500 Gigabit per second (Gb/s) photonic integrated circuits (PICs).

By surmounting the problems of PMD, coherent transmission will allow higher communication rates without penalty from the common fiber impairment. Infinera and Verizon (News - Alert) report on the real-time PMD tolerance measurement results of Infinera's coherent transmission technology. With the signal processing built into the modem, performance can be analyzed for both first-order and second-order PMD.

"Our team, with Verizon, was able to demonstrate a coherent optical transmission that can handle large PMD values with our commercially available 500 Gb/s PIC," stated Dave Welch, Infinera co-founder, EVP and CSO of Infinera.

"System vendors in the industry today are having a difficult time achieving this. Not all coherent systems are the same. This paper illustrates the robustness of our optical solution and is a tribute to our brilliant teams here in Sunnyvale and in our Ottawa Design Center, developing the algorithms to make this possible," Welch added.

The company presents real-time polarization mode dispersion (PMD) tolerance measurement results with a commercially available 500 Gb/s coherent modem. The first- and second-order PMD space is explored, showing that peak values of 500 ps of static, first-order PMD (differential group delay) have small penalties. The system was stressed using fast scrambling, with polarization change of over 10 000 rad/s, along with high mean PMD. Penalties were small with sufficient equalization.

Infinera was founded for the purpose of bringing the advantages of digital networking to the optical layer.

Also, the Infinera Digital Optical Network is the first switched WDM system, utilizing its breakthrough Photonic Integration Circuits to provide unrivaled flexibility, capacity, and manageability. It's raising standards on a technical level, and lowering barriers from an economic perspective.

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