title: Coherent UDWDM PON with joint subcarrier reception at OLT.
abstract: 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.
authors.forename: Christoph
authors.initials: C
authors.lastname: Kottke
authors.forename: Johannes Karl
authors.initials: JK
authors.lastname: Fischer
authors.forename: Robert
authors.initials: R
authors.lastname: Elschner
authors.forename: Felix
authors.initials: F
authors.lastname: Frey
authors.forename: Jonas
authors.initials: J
authors.lastname: Hilt
authors.forename: Colja
authors.initials: C
authors.lastname: Schubert
authors.forename: Daniel
authors.initials: D
authors.lastname: Schmidt
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Wu
authors.forename: Berthold
authors.initials: B
authors.lastname: Lankl