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Proceedings Article

112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity

[+] Author Affiliations
Paraskevas Bakopoulos, Stefanos Dris, Nikolaos Argyris, Christos Spatharakis, Hercules Avramopoulos

National Technical Univ. of Athens (Greece)

Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750A (March 7, 2016); doi:10.1117/12.2211639
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From Conference Volume 9775

  • Next-Generation Optical Networks for Data Centers and Short-Reach Links III
  • Atul K. Srivastava
  • San Francisco, California, United States | February 13, 2016

abstract

Datacenter traffic is exploding. Ongoing advancements in network infrastructure that ride on Moore’s law are unable to keep up, necessitating the introduction of multiplexing and advanced modulation formats for optical interconnects in order to overcome bandwidth limitations, and scale lane speeds with energy- and cost-efficiency to 100 Gb/s and beyond. While the jury is still out as to how this will be achieved, schemes relying on intensity modulation with direct detection (IM/DD) are regarded as particularly attractive, due to their inherent implementation simplicity. Moreover, the scaling-out of datacenters calls for longer transmission reach exceeding 300 m, requiring single-mode solutions. In this work we advocate using 16-QAM sub-cycle Nyquist-SCM as a simpler alternative to discrete multitone (DMT), but which is still more bandwidth-efficient than PAM-4. The proposed optical interconnect is demonstrated at 112 Gb/s, which, to the best of our knowledge, is the highest rate achieved in a single-polarization implementation of SCM. Off-the-shelf components are used: A DFB laser, a 24.3 GHz electro-absorption modulator (EAM) and a limiting photoreceiver, combined with equalization through digital signal processing (DSP) at the receiver. The EAM is driven by a low-swing (<1 V) arbitrary waveform generator (AWG), which produces a 28 Gbaud 16-QAM electrical signal with carrier frequency at ~15 GHz. Tight spectral shaping is leveraged as a means of maintaining signal fidelity when using low-bandwidth electro-optic components; matched root-raised-cosine transmit and receive filters with 0.1 excess bandwidth are thus employed. Performance is assessed through transmission experiments over 1250 m and 2000 m of SMF. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Paraskevas Bakopoulos ; Stefanos Dris ; Nikolaos Argyris ; Christos Spatharakis and Hercules Avramopoulos
" 112 Gb/s sub-cycle 16-QAM Nyquist-SCM for intra-datacenter connectivity ", Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750A (March 7, 2016); doi:10.1117/12.2211639; http://dx.doi.org/10.1117/12.2211639


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