September 20, 2012

All-ETDM 107-Gbaud (214-Gb/s) Single-Polarization QPSK Transmitter and Coherent Receiver

  • Adamiecki A.
  • Buhl L.
  • Draving S.
  • Dupuy J.
  • Grove M.
  • Jorge F.
  • Konczykowska A.
  • Peckham D.
  • Raybon G.
  • Rush K.
  • S.Chandrashekhar
  • Winzer P.
  • Xie C.
  • Zhu B.

We demonstrate an all-electronically multiplexed, single-polarization 107-Gbaud quadraturephase-shift-keyed (QPSK) transmitter and off-line coherent detection using a real-time sampling oscilloscope prototype with 63-GHz electronic bandwidth, sampled at 160-GS/s. Using only distributed feedback lasers, we obtain a back-to-back implementation penalty of 4 dB and 2400-km transmission. . Introduction Symbol rates up to 107 Gb/s using electronically multiplexed transmitters and receivers have been previously demonstrated in direct detection experiments using on/off keyed (OOK), duobinary and differential phase shift keyed (DPSK) modulation formats [1,2], enabled by high speed electronic multiplexers, photodiodes, and demultiplexers [3,4]. With the move to digital coherent detection in optical transport [5], symbol rates have been limited by the bandwidth of analog-to-digital converters (ADCs), which in off-line research experiments take the form of fast sampling oscilloscopes; the highest symbol rates reported for coherent detection today is 80 Gbaud [6]. Optical techniques have been employed to circumvent this limitation and quasi-real-time sampling of a QPSK signal has been demonstrated at 66 [7]. Here we demonstrate the first coherent reception of a 107-Gbaud (214-Gb/s) singlepolarization QPSK optical signal using a realtime sampling oscilloscope operating at 160Gs/s with a 63-GHz electrical bandwidth. Owing to the relaxed phase noise requirements at the high symbol rate, we use distributed feedback lasers (DFBs) for both signal and local oscillator (LO).

View Original Article

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...