US provider of Intelligent Transport Networks Infinera has announced it has achieved two industry-first milestones for advanced coherent technologies that increase the capacity and reach of optical transport networks.US provider of Intelligent Transport Networks Infinera has announced it has achieved two industry-first milestones for advanced coherent technologies that increase the capacity and reach of optical transport networks.
The first milestone drives optical transmission technologies to 100 Gbaud and the second enhances modulation technology to 1024QAM. The company says these new technologies, showcased at the recent ECOC 2017 event, are designed to deliver the highest possible capacity on a single wavelength for varied distances, helping operators extract the best performance from their optical transport networks.
“Infinera uniquely uses vertical optical integration to extract maximum performance from the optical transport network,” claims Andrew Schmitt, Lead Analyst at Cignal AI. “The new levels of performance in baud rate and modulation schemes for Terabit wavelengths exhibited at ECOC are a good example of how this approach can eventually result in production solutions with greater capacity and reach.”
Optical transport networks are a critical component of the global communications infrastructure, and rely on three axes for increasing transmission performance:
- Baud rate: The typical deployed baud rate is 32 Gbaud with the quadrature phase shift keying modulation carrying 4 bits per baud, resulting in 100 Gbits/s of transmission. While industry optoelectronics are moving to 66 Gbaud development demonstrations, Infinera is the first to showcase 100 Gbaud with 32QAM to achieve a single-wavelength 1 Tbits/s data rate using multi-channel Indium Phosphide-based Photonic Integrated Circuits (PICs) integrated with electronic driver and amplifier application-specific integrated circuits.
- Modulation scheme: At ECOC, Infinera 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 Tbits/s, yielding spectral efficiency of 9.35 bits per second per Hertz over 400 km, an industry first.3.
- Channel count: Implements multiple parallel wavelengths on a single module to create a coherent super-channel. As baud rates increase, placing optical components closer together on an integrated chip reduces component size and power while increasing reliability.
“Infinera is delivering optical engines at a faster cadence to help operators achieve exceptional capacity and reach performance on their transport network infrastructures,” said Dr. 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.”