50Gbit/s PAM4 clock recovery for 5G front haul and data centres

50Gbit/s PAM4 clock recovery for 5G front haul and data centres

New Products |
By Nick Flaherty

Semtech has started production of several PAM4 clock data recovery (CDR) chips for 5G front haul and data centre applications.

The GN2256 is a bidirectional analog PAM4 CDR with an integrated differential driver offering ultra-low latency, low power and use of low cost 25Gbit/s bandwidth optics to operate at 50Gbit/s PAM4.

As 5G deployment continues to increase around the globe, different architectures based on geographic region and carrier preferences are needed to enable expansion in all areas. A use for the parts will be 50Gbit/s PAM4 deployments will be Wavelength Division Multiplexing of several wavelengths on a single fibre in both front haul telecom sand data centre datacoms applications.

The GN2256 has a proprietary driver architecture that is suitable to enable such 50Gbit/s WDM optical solutions using EML (electro-absorption modulated lasers) and future silicon photonics optics. The GN2256 combines Semtech’s proprietary analog Tri-Edge technology with enhanced laser driver compensation to enable IEEE and Open Eye MSA compliant optical modules over industrial temperature ranges.

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“We are ready to enable volume shipments for our optical module partners and system vendors,” said Raza Khan, senior market manager for Semtech’s Signal Integrity Products Group. “Semtech is now the one stop shop for our optical module partners and system vendors to enable worldwide 5G front haul deployments for all regions and all architectures.”

The GN2255 is a bidirectional 50Gbit/s PAM4 CDR with Integrated DML (directly modulated laser) driver while the GN2256 adds an integrated EML/MZM driver.

Meanwhile the GN2559S is aimed at data centre short-reach (SR) and long-reach (LR) optical links. This is a PAM4 receiver with quad PAM4 clock data recover (CDR) blocks and integrated linear transimpedance amplifiers (TIAs) offering ultra-low power and low latency receiver performance that meets the needs of high-performance computing (HPC), artificial intelligence (AI) and Cloud data centre networks.

“The initial production availability of the next generation Tri-Edge GN2559S receiver is moving the needle for the strong and fast growing PAM4 data centre market. Building upon the Tri-Edge PAM4 SR CDR chipset, which was successfully developed for major Cloud data centres, the GN2559S will offer more power saving and enhanced receiver performance,” said Tim Vang, vice president, marketing and applications for Semtech’s Signal Integrity Products Group.

“With 400mW power reduction from the previous generation receiver, the GN2559S enables industry best in class power consumption for both SR and LR data centre optical interconnects.” The Tri-Edge GN2559S is now in initial production and Semtech will also offer a complete Reference Design Kit (RDK) for SR and LR applications to enable rapid adoption of Semtech’s solution.

Semtech’s Tri-Edge CDR portfolio for data centres includes dual and quad PAM4 56Gbit/s CDR + TIA devices, added VCSEL laser drivers and DML driver.

The Tri-Edge GN 2256 and GN2559S will be demonstrated at the European Conference on Optical Communication (ECOC) this week.

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