title: A long-reach ultra-dense 10 Gbit/s WDM-PON using a digital coherent receiver.
abstract: We investigate the impact of channel spacing and nonlinear transmission over 120 km of standard single mode fiber for a 10 Gbit/s long-reach wavelength division multiplexed passive optical network (WDM-PON). We employed polarization division multiplexed quadrature phase shift keying (PDM-QPSK), which allowed data transmission at 3.125 GBaud, including a 25% overhead for forward error correction. To receive this spectrally efficient modulation format, a digital coherent receiver was employed, allowing for both frequency selectivity and an increased sensitivity of -45 dBm (25 photons/bit).We investigated a channel spacing as low as 5 GHz, for which the loss budget was 48.6 dB, increasing to 54.0 dB for a 50 GHz grid.
authors.affiliation: Optical Networks Group, UCL Electronic & Electrical Engineering, Torrington Place, London WC1E 7JE, UK. d.lavery@ee.ucl.ac.uk
authors.forename: Domaniç
authors.initials: D
authors.lastname: Lavery
authors.forename: Maria
authors.initials: M
authors.lastname: Ionescu
authors.forename: Sergejs
authors.initials: S
authors.lastname: Makovejs
authors.forename: Enrico
authors.initials: E
authors.lastname: Torrengo
authors.forename: Seb J
authors.initials: SJ
authors.lastname: Savory
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008872:Microwaves; D055100:Optical Fibers; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*; D014159:Transducers