Bidirectional wavelength-division multiplexing transmission over installed fibre using a simplified optical coherent access transceiver

Abstract

High-speed broadband services require optical fibres in access networks, in which multiple subscribers are connected to service providers, to satisfy the continuously growing bandwidth demand. The primitive signaling scheme used in access networks enables the use of low-cost equipment but diminishes the bandwidth available to end-users. Thus, current technology will be unable to support future broadband demands. Coherent communication systems offer significantly improved power- and bandwidth-efficiency, but require fundamental simplifications to become economically viable for access networks. Here, we demonstrate a promising simplified coherent receiver exhibiting a robust performance against polarisation fluctuations over an installed fibre network. It enables the realisation of high-order modulation formats and offers high sensitivities, achieving a four-fold increase in the supported number of subscribers and approximately doubling the transmission distance compared to the recently standardized access technology. The proposed solution indicates that digital coherent technology can be feasible and transform the access networks, enabling ubiquitous new services and applications with uncontended, multi-gigabits/user broadband connections.

Real-time 10Gbps Polarization Independent Quasicoherent Receiver for NG-PON2 Access Networks

“…Content may change prior to final publication. NG-PON2 requirement ±12.5 GHz ±20 GHz Quasicoherent receiver with P RX of -34dBm ±16.65 GHz -Quasicoherent receiver with P RX of -32dBm ±19.75 GHz ±19.75 GHz (APD) only provide an improvement between 5 and 10 dB in comparison with the PDs [6,7].…”

“…Coherent technologies [7] have been researched during the recent years as a promising solution to satisfy these more and more demanding requirements of the optical access network. Cost-effective emitters have been proposed for coherent optical access networks as directly-phase modulated D Fig.…”

Real-Time 10 Gbps Polarization Independent Quasicoherent Receiver for NG-PON2 Access Networks

“…This improvement increases to 14.9 dB when the dispersion penalty of 40 km SSMF transmission is included. Typical avalanche photodiodes (APD) only provide an improvement between 5 and 10 dB in comparison with the PDs [6,7].…”

“…Coherent technologies [7] have been researched during the recent years as a promising solution to satisfy these more and more demanding requirements of the optical access network. Cost-effective emitters have been proposed for coherent optical access networks as directly-phase modulated 0733-8724 (c) 2018 IEEE.…”

Single Sideband Signals for Phase Noise Mitigation in Wireless THz-Over-Fibre Systems

“…1 we show the implementation scenario that we envisage within this paper. Note that, in the central office (CO), where the total cost is shared between all the users supported by the network, volume-production semiconductor lasers with linewidths in the range of a few hundreds of kHz are economically acceptable [8].…”