Nice, France here we come! The Acacia team is excited to attend NGON & DCI Europe 2018 this month for the fifth year in a row. There is always something fun to do in Nice, from attending NGON and the annual beach party at le galet to taking in the some of the local architecture designed by Buzzi, Bernasconi, and Baptiste.

We, of course, most look forward to hearing updates from industry luminaries about the future of optical networking and discussing Acacia Communications’ optical interconnect solutions and how they help meet the demands of today and tomorrow’s optical networks. We think some of this year’s hot topics will be:

• Addressing the need to grow capacity in access and edge networks with coherent ZR optics solutions
• Optimizing multi-haul network capacity
• Expanding data center interconnect bandwidth to 400G and beyond
• Leveraging coherent pluggable modules for applications including access, metro, and DCI to help reduce CapEX and OpEx and accelerate time to market
• Using coherent optics in wireless backhaul for 4G/5G

We look forward to connecting with our peers to discuss these topics. To schedule a meeting with Acacia Communications, please submit a request through our contact form.

You can follow our updates from the show on Twitter @AcaciaComms or #NGON2018.

We look forward to seeing you in Nice!

Transmission reaches for metro applications have to be above 50 km for metro/access and below 1000 km for metro/regional applications. This requires compact, scalable, cost-efficient, and easy-to-use digital coherent transport solutions such as the Acacia CFP2 module.

Figure 1: CFP2 coherent module

Acacia’s engineering team led by Hongbin Zhang recently demonstrated real-time transmission of 16 Tb/s (80x200Gb/s) over 1020km TeraWave ULL fiber with 170km span length using the 200Gb/s CFP2 module. The length, while much longer than typical metro/regional spans, was chosen to stress the OSNR budget while showing achievable amplifier spacing with ultra-low loss fiber. The results showed a record low power consumption less than 0.1W/Gbps. This is the lowest reported power consumption per bit for coherent optical transceivers.

Figure 2: Circulating loop setup for transmission experiments.

For the purpose of this experiment the CFP2 module was implemented in multi-source agreement (MSA) 107.5 mm x 41.5 mm form factor. Test specifics include:

• To test the 200Gb/s transmission performance as a function of OSNR for PM-8QAM on a 50GHz grid (4 bits/s/Hz SE) and PM-16QAM on a 37.5GHz grid (5.33 bits/s/Hz SE), we placed the 4 CFP2 channels next to each other in the middle of the C-band. One of the middle CFP2 channels was selected by a 50GHz optical demux in front of the coherent receiver and the real-time BER was measured as a function of received OSNR by varying the EDFA output power and subsequently converted into Q2-factor.
• To test the transmission performance as a function of the wavelength, we determined the Q2-factor from the measured real-time BER of the two middle channels among 4 consecutive CFP2 50GHz-spaced channels as they are moved across the C-band.

Relying on pluggable CFP2 transceiver modules, we were able to demonstrate successful 200Gb/s real-time transmission of 80 PM-8QAM and PM-16QAM channels at 4 bits/s/Hz spectral efficiency over 1020 km distance using very long 170km spans of TeraWave ULL fiber showing 2.8dB and 1.2dB Q²-margin, respectively. We were also able to prove an increase in system capacity as well as a decrease in power consumption per bit for coherent optical transceivers.

The research paper, published by Optics EXPRESS, is available to read or download here.