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OIF unveils PAM4 and NRZ modulations in the same app

Posted: 31 Mar 2016 ?? ?Print Version ?Bookmark and Share

Keywords:optoelectronics? ofc2016? serial communications? fibre optics? optical transceiver manufacturing?

The Optical Internetworking Forum, or OFC 2016, held annually, demonstrates the latest in high-speed serial communications. The serial links either use fibre optics or entirely copper based. But those with optical links must have some copper content in the signal path. The following demonstrations reveal how the connector, cable, IC, and optical transceiver manufacturers work together.

The OIF assembled demonstrations showing how both PAM4 and NRZ modulations can be used in the same application. One such application is a 56Gbps PAM4 (4-level Pulse Amplitude Modulation) VSR (very short reach) serial link.

This demonstration consists of Inphi transceivers connected to QSFP28 compliance boards by Yamaichi and Amphenol.

CEI-56G-VSR-PAM4

Figure 1: Yamaichi and Amphenol Module and Compliance Board.

A Multilane ML4004-PAM time-domain analyser generates the 28Gbaud (56Gbit/s) test signal, then analyses the received signal. In the video below, Hani Daou of Multilane explains the setup.

Adjacent to the 56Gbit/s VSR PAM4 demo was an NRZ (non-return-to-zero version). This demonstration used QSFP28 transceivers from Molex and Multilane with SerDes from Credo Semiconductor. Other demonstrations included medium reach and long-reach applications.

Imphi transceiver

Figure 2: A board with Imphi tranceiver is connected to a PAM4 analyzer and optical transceivers.

-Martin Rowe
EDN





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