NeoPhotonics demonstrates 90 km 400ZR transmission in 75 GHz DWDM channels enabling 25.6 Tbps per fiber

NeoPhotonics completed experimental verification of the transmission of 400Gbps data over data center interconnect (DCI) link in a 75 GHz spaced Dense Wavelength Division Multiplexing (DWDM) channel.

NeoPhotonics achieved two milestones using its interoperable pluggable 400ZR [1.] coherent modules and its specially designed athermal arrayed waveguide grating (AWG) multiplexers (MUX) and de-multiplexers (DMUX).

Note 1. ZR stands for Extended Reach which can transmit 10G data rate and 80km distance over single mode fiber and use 1550nm lasers.

  • Data rate per channel increases from today’s non-interoperable 100Gbps direct-detect transceivers to 400Gbps interoperable coherent 400ZR modules.
  • The current DWDM infrastructure can be increased from 32 channels of 100 GHz-spaced DWDM signals to 64 channels of 75 GHz-spaced DWDM signals.
  • The total DCI fiber capacity can thus be increased from 3.2 Tbps (100Gbps/ch. x 40 ch.) to 25.6 Tbps (400Gbps/ch. x 64 ch.), which is a total capacity increase of 800 percent.

NeoPhotonics said its technology overcomes multiple challenges in transporting 400ZR signals within 75 GHz-spaced DWDM channels.

The filters used in NeoPhotonics MUX and DMUX units are designed to limit ACI [2.] while at the same time having a stable center frequency against extreme temperatures and aging.

Note 2.  ACI stands for Adjacent Channel Interface; it also can refer to Application Centric Infrastructure.

What is 400ZR? - Ciena

NeoPhotonics has demonstrated 90km DCI links using three in-house 400ZR pluggable transceivers with their tunable laser frequencies tuned to 75GHz spaced channels, and a pair of passive 75GHz-spaced DWDM MUX and DMUX modules designed specifically for this application. The optical signal-to-noise ratio (OSNR) penalty due to the presence of the MUX and DMUX and the worst-case frequency drifts of the lasers, as well as the MUX and DMUX filters, is less than 1dB. The worst-case component frequency drifts were applied to emulate the operating conditions for aging and extreme temperatures, the company said in a press release.

“The combination of compact 400ZR silicon photonics-based pluggable coherent transceiver modules with specially designed 75 GHz channel spaced multiplexers and de-multiplexers can greatly increase the bandwidth capacity of optical fibers in a DCI application and consequently greatly decrease the cost per bit,” said Tim Jenks, Chairman and CEO of NeoPhotonics. “These 400ZR coherent techniques pack 400Gbps of data into a 75 GHz wide spectral channel, placing stringent requirements on the multiplexers and de-multiplexers. We are uniquely able to meet these requirements because we do both design and fabrication of planar lightwave circuits and we have 20 years of experience addressing the most challenging MUX/DMUX applications,” concluded Mr. Jenks.

About NeoPhotonics

NeoPhotonics is a leading developer and manufacturer of lasers and optoelectronic solutions that transmit, receive and switch high-speed digital optical signals for Cloud and hyper-scale data center internet content provider and telecom networks. The Company’s products enable cost-effective, high-speed over distance data transmission and efficient allocation of bandwidth in optical networks. NeoPhotonics maintains headquarters in San Jose, California and ISO 9001:2015 certified engineering and manufacturing facilities in Silicon Valley (USA), Japan and China. For additional information visit www.neophotonics.com.

References:

https://www.neophotonics.com/press-releases/?newsId=11856

https://www.telecompaper.com/news/neophotonics-demonstrates-90-km-400zr-transmission-in-75-ghz-dwdm-channels-enabling-256-tbps-per-fibre-capacity–1343096

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