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Home Semiconductor News

Infinera Sets Two Milestones For Optical Transport

Semiconductor For You by Semiconductor For You
October 27, 2017
in Semiconductor News
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Network company Infinera has announced that it has achieved two industry-first milestones for coherent technologies that increase the capacity and reach of optical transport networks to the next level.
The first milestone drives optical transmission technologies to 100 gigabaud (GBaud), and the second milestone enhances modulation technology to 1024QAM (quadrature amplitude modulation). These new technologies are designed to deliver the highest possible capacity on a single wavelength for varied distances.

New PIC-based technologies are designed to deliver the highest possible capacity on a single wavelength for varied distances
New PIC-based technologies are designed to deliver the highest possible capacity on a single wavelength for varied distances

The typical deployed baud rate is 32 GBaud with the quadrature phase shift keying modulation carrying 4 bits per baud, resulting in 100 gigabits per second of transmission. While industry optoelectronics are moving to 66 GBaud development demonstrations, Infinera claims to be the first to showcase 100 GBaud using 32QAM to achieve a single-wavelength 1 terabit per second (Tb/s) data rate. It is using multi-channel InP-based PICs integrated with electronic driver and amplifier application-specific integrated circuits. This result was presented at the 2017 European Conference on Optical Communications (ECOC) in September.

At ECOC, Infinera also showcased the higher-order modulation scheme of 1024QAM using advanced constellation shaping algorithms and Nyquist subcarriers, allowing wavelengths to be spaced close to each other to maximise the data rate for a certain reach.

The Infinera test bed used 66 GBaud at 1024QAM to reach 1.32 Tb/s, yielding spectral efficiency of 9.35 bits per second per hertz over 400 kilometers (km), an industry first.

Infinera also says that its PIC technology uniquely enables high-channel-count coherent super-channels. These innovative technologies indicate the next level of capacity and reach achievable in the years to come.

“Infinera is delivering optical engines at a faster cadence to help operators achieve exceptional capacity and reach performance on their transport network infrastructures,” said Dave Welch, Infinera co-founder and president. “As 5G wireless and cable video services take off, Infinera offers significant value to transport network operators by designing industry-first solutions.”

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