Open AccessCoherent UDWDM PON with joint subcarrier reception at OLT
Author(s) -
Christoph Kottke,
Johannes Fischer,
Robert Elschner,
Felix Frey,
J. Zach Hilt,
C. Schubert,
Daniel Schmidt,
Zifeng Wu,
Berthold Lankl
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.016876
Subject(s) - multiplexing , passive optical network , wavelength division multiplexing , optical line termination , polarization division multiplexing , computer science , time division multiplexing , electronic engineering , subcarrier , optics , physics , telecommunications , channel (broadcasting) , wavelength , orthogonal frequency division multiplexing , engineering
In this contribution, we report on the experimental investigation of an ultra-dense wavelength-division multiplexing (UDWDM) upstream link with up to 700 × 2.488 Gb/s polarization-division multiplexing differential quadrature phase-shift keying parallel upstream user channels transmitted over 80 km of standard single-mode fiber. We discuss challenges of the digital signal processing in the optical line terminal arising from the joint reception of several upstream user channels. We present solutions for resource and cost-efficient realization of the required channel separation, matched filtering, down-conversion and decimation as well as realization of the clock recovery and polarization demultiplexing for each individual channel.