Ultra-dense, transparent and resilient ring-tree access network using coupler-based remote nodes and homodyne transceivers

Abstract

We propose an Ultra-Dense Wavelength Division Multiplex Passive Optical Network (UD-WDM-PON) based on homodyne detection in a totally transparent ring-tree implementation. It is based on time switching phase diversity homodyne detection and local oscillator reuse for upstream transmission. 4 GHz spaced 1 Gb/s streams were correctly received in a 30 km experimental deployment serving 1024 users.

An improved dynamic wavelength assignment in statistical UDWDM-PONs

“…WDM-PONs can provide dedicated wavelengths to the users and, by spacing channels very densely at few GHz, ultradense WDM (UDWDM) increases the spectral efficiency significantly, while introducing the "wavelength-to-the-user" concept. An UDWDM-PON can be implemented using coherent techniques at the transceiver, furnishing great selectivity, high sensitivity and, therefore, high network user capacity and long reach extension [7]- [8].…”

Asymmetric transmission from a 2D PT-symmetric honeycomb nanostructure

“…The significant technology to be developed is a low-cost coherent detection scheme with excellent wavelength selectivity and high sensitivity [4], enabling high speed connections to end users while deploying high splitting ratios and long-reach extension in the Optical Distribution Network (ODN). Furthermore, the most bandwidth efficient solution is the Ultra Dense Wavelength Division Multiplexing (UDWDM) [5]- [6], spacing channels ultra-densely at a few GHz and using bit rates from 100 Mb/s to 10G, thus adding a high aggregate capacity to the deployed PON.…”

“…When using the same local oscillator as transmitter and receiver in a HD mode, particularly in DPSK, the transceiver architecture can be with external modulation [5] (Fig. 1, left) or direct modulation [8] (Fig.…”

COCONUT requirements for residential, business and outdoor scenarios

“…Despite the four-wave missing (FWM) crosstalk between channels, received constellations at 3 dB input power for several distances were well resolved. Fàbrega et al [10] propose a UDWDM scheme with 4GHz spaced channels. With a power budget of 49 dB the ring is able to serve 1 Gb/s streams to 1024 users.…”