Several test announcements came out of the annual conference in Los Angeles. High-speed Ethernet for datacenters and the underlying technologies were featured.
The Optical Fiber Communications (OFC) conference took place last week in Los Angeles, California. As is typical, several test announcements came about as datacenter communications exceeding 200 Gbits/s and 400 Gbits/s are emerging. There are also several demonstrations of new communications technologies.
Anritsu showcased a 100-Gbit/s Shortwave Wavelength Division Multiplexing (SWDM) transmission over wideband multimode fiber (OM5). The demonstration included the Anritsu Network Master Flex MT1100A field optical transport tester, CommScope LazrSPEED OM5 WideBand multimode fiber connectivity products, and Finisar 100-Gbit/s SWDM4 QSFP28 optical modules.
Anritsu, Finisar, and CommScope demonstrated 100-Gbit/s Shortwave Wavelength Division Multiplexing (SWDM) transmission. Source: Anritsu
The 200-Gbit/s and 400-Gbit/s optical technologies are based on two or four 56-Gbit/s data lanes, respectively. A demonstration of a 56-Gbit/s modulated with four-level quadrature-amplitude modulation (QAM-64) took place in the Teledyne LeCroy booth, where a Coherent Solutions IQTransmitter with 40-GHz RF bandwidth generated the signals. A Teledyne LeCroy 65-GHz LabMaster 10-65Zi-A real-time oscilloscope lets engineers view signals using eye and constellation diagrams.
56-Gbit/s QAM-64 signals are on display at OFC 2017. Source: Teledyne LeCroy
Keysight Technologies featured numerous demonstrations of test equipment for optical communications. One such demonstration included the M8040A 64-Gbaud high-performance BERT (bit-error-ratio tester). The BERT supports four-level pulse-amplitude modulation (PAM4) and non-return-to-zero (NRZ) signals. Using PAM4 modulation, 64 Gbaud yields 128-Gbits/s data rates. The M8040A can, therefore, generate test patterns for the 200-Gbit/s and 499-Bit/s communications standards.
Keysight Technologies demonstrated the M8040A BERT (lower left), capable of generating a 64-Gbaud signal, at OFC 2017. Source: Keysight Technologies
Acacia Communications, Optelian, Precise-ITC, Spirent, and Xilinx came together to demonstrate 200-Gbit/s and-400 Gbit/s Ethernet links. Spirent, the first company to offer 200-Gbit/s Ethernet testing capabilities, provided the test equipment that generated native 200- and 400-GbE client signals. Precise-ITC provided the technology needed to map the signals into 2x100 and 4x100 OTU4 encapsulated signals, respectively, using a Xilinx UltraScale FPGA VCU140 design platform. Optelian provided the dense wavelength division multiplexing (DWDM) transport by multiplexing the OTU4 signals into 1x200-Gbit/s or 2x200-Gbit/s DP-16QAM using Acacia's coherent technology. Optelianís TMX-2200 200-Gbit/s muxponder, scheduled for release later this year, will use Acacia Communications' CFP2-DCO coherent pluggable transceiver.
The Spirent 200G tester was used to demonstrate 200-Gbit/s and 400-Gbit/s Ethernet over a fiber-optic link. Source: Spirent
Silicon photonics keeps making slow but steady headway into what might replace copper on PCBs. At OFC 2017, Luxtera announced that the company is now sampling its 100G-CWDM2 QSFP optical transceiver module. Scheduled for full release in the second half of 2017, the LUX45202 will be a 100-Gbit/s optical transceiver on a QSFP28 package. It will operate at 10.30125 Gbit/s, 20.625 Gbits/s, or 25.78125 Gbit/s with a reach of over 2,000 m.
A Luxtera optical module is based on Silicon Protonics. Source: Luxtera
OFC 2018 will take place in San Diego, California from March 11 to March 15.
—Martin Rowe covers test and measurement for EE Times and EDN. Contact him at email@example.com