Single-Fiber Lightwave Centralized WDM-OFDMA-PON With Colorless Optical Network Units

Abstract

Abstract-We propose and experimentally demonstrate a carrier-reuse, single-feeder, wavelength-division-multiplexed, orthogonal-frequency-division-multiple-access passive optical network (WDM-OFDMA-PON) with colorless direct-detection optical network units and coherent detection optical line terminals. We examine two strategies by adjusting the frequency occupancy and the modulation format of the uplink (UL) and downlink (DL) signals. We investigate the impact of DL signal-to-carrier ratio on performance of both UL and DL via simulations and identify impairments limiting system performance. As a proof of concept, we demonstrate on a single wavelength channel, a realization of each of the two scenarios investigated using orthogonal-frequency-division-multiplexing (OFDM). A quadrature phase-shift keying approach with wide spectrum and narrow guard band achieves 21.6 Gb/s. A 32-ary quadrature amplitude modulation approach with narrow spectrum and wide guard band achieves 14.5 Gb/s and a span of over 80 km.

Extenuation of phase shift influenced nonlinear impairments in fiber optics network

“…The development of the telecommunication industry with a considerable support from fiber optics networks (FONs) has brought several advancements such as long range transmission, high data rates, low latency, and extremely high reliability. 1 However, the demand for further improvement is increasing exponentially due to the new requirements imposed by state-of-the-art applications and technologies such as 4K video streaming, online gaming, virtual reality (VR) applications, etc. 2,3 Thus, some modern up-gradation is required to enhance system capabilities without compromising the key performance indicators of ultra-reliability and low-latency for future mobile systems.…”

Zero Guard Band Multi-Twin-SSB System in Single Fiber Bidirectional PON Transmission

“…Rayleigh backscattering (RB) noise is also another obstacle for the bidirectional transmission. Lots of works have been done recently for RB noise mitigation [43]- [45]. Ref [43] used a radio frequency signal synthesizer to reduce the spectral overlap between the distributed carrier and desired signal.…”

“…Ref. [44], [45] introduced guard band between the downstream and upstream signals. The system performances were improved but the SE was reduced as well.…”

Bidirectional WDM-OOFDM access network based on a sliceable optical transceiver with colorless ONUs

“…However, other approaches in the literature propose to employ DDO-OFDM for DL but deploy a coherent receiver at OLT for the UL signal transmission in order to take advantage of superior performance for UL to enable symmetric data transmission rates. Remotely seeded approaches with separate fibers [17] or employing one sideband for each DL/UL signal transmission [18] are examples to demonstrate symmetrical single-feeder, lightwave centralized OFDMA-PON architectures but a larger number of components is required as the expense for higher performance [19].…”