Ultra-Dense WDM PON with 12.5-GHz Spaced 256 Channels

IEEE Photon. Technol. Lett.

et al. 2015

We demonstrate a spectrum-sliced wavelengthdivision-multiplexed passive optical network with the channel spacing of 25 GHz, where even and odd channels are spectrum sliced separately using a pair of 50-GHz arrayed-waveguide gratings (AWGs). The 50-GHz AWGs have an offset of 25 GHz with respect to each other. Similarly, the demultiplexing is done using a pair of 50-GHz AWGs for even and odd channels separately. Our use of 50-GHz AWGs gives better bit-error rate performances than using 25-GHz AWGs in a conventional way. With 50-GHz AWGs, the channel bandwidth is increased about two times larger than using 25-GHz AWGs. Moreover, the increased spectral overlap between adjacent channels produces relatively small crosstalk since the channels are incoherent and their intensity noise is absorbed by reflective semiconductor amplifiers. The 25-GHz spaced spectrum-sliced WDM passive optical network can be realized more easily using 50-GHz AWGs since 50-GHz AWGs are more available in the market than 25-GHz AWGs.Index Terms-Optical communication, optical fiber communication, optical fiber LAN, semiconductor optical amplifiers, wavelength division multiplexing (WDM).

Section: Resultsmentioning

confidence: 98%

25-GHz Spaced Spectrum-Sliced WDM PON Using 50-GHz AWGs

Manandhar

IEEE Photon. Technol. Lett.

et al. 2015

“…Typical AWG devices operate in C and L bands and offer between 25 GHz and 100 GHz bandwidth with a capacity going up to 40 channels. Recent research efforts made it possible to develop 12.5 GHz channel spacing AWG [21], [22] that enables the migration to high capacity WDM networks and compliant to flexible grid WDM [23]. In [21], the authors proposed 8 channels and 12.5 GHz bandwidth spacing AWG based on small-bend structures using trenches filled with low-refractive index material and offering compact size compared with conventional AWG.…”

Section: Remote Node Architecturementioning

confidence: 99%

“…In [21], the authors proposed 8 channels and 12.5 GHz bandwidth spacing AWG based on small-bend structures using trenches filled with low-refractive index material and offering compact size compared with conventional AWG. Another research work [22] demonstrates an ultra-dense WDM PON network based on 12.5 GHz channels AWG. The proposed component offers 256 channels raising the ultra dense WDM network capacity.…”

Section: Remote Node Architecturementioning

confidence: 99%

Flexible and Scalable Radio over Fiber Architecture

Rebhi¹,

Barrak²,

Menif³

2019

RADIOENGINEERING

In this paper, we investigate a scalable Radio over Fiber (RoF) system compliant to 5G fronthauling requirements. The proposed RoF architecture is able to adjust the network resources and capacities to satisfy user demands in terms of service, data rate and bandwidth. The flexibility and the reconfigurability of the proposed topology are provided through the inclusion of flexible network nodes which are at the Central Office (CO), the Remote Node (RN) and the Remote Access Unit (RAU). The centralized management of the RoF system based on a Software Defined Networking (SDN) enables the monitoring of the overhaul RoF system and the reconfiguration of network nodes parameters. The proposed RoF system architecture is designed to support multi-standard operation and mm-wave services. We investigated multi-service operation assuming high speed mm-wave service at 60 GHz besides to conventional wireless services such as WiFi and WiMax. The introduced system is able to operate for different RF bands (2.4, 5.2 and 60 GHz) with various modulation schemas such as BPSK, QPSK, 16QAM and 64QAM, that may be associated to Orthogonal Frequency-Division Multiplexing (OFDM) and multidata rates up to 5 Gbps. To validate the RoF system performances, we have considered the Error Vector Magnitude (EVM) and service constellation as figures of merit at the End User (EU). The simulated results testify the architecture viability.

“…Widely tunable laser diodes are essential ingredients as light sources for various applications such as wavelength division multiplexing systems, all-optical networks, bio-sensors, and optical coherence tomography [1][2][3][4][5]. For a long time, tunable laser diodes have usually been designed and fabricated based on grating structures, but there are some difficulties in mass production because fabrication is complex.…”

Section: Introductionmentioning

confidence: 99%

Widely Tunable Coupled-ring Reflector Laser Diode Consisting of Square Ring Resonators

Byun

Journal of the Optical Society of Korea

et al. 2010

We design and fabricate a widely tunable laser diode made of InGaAsP-InP. The diode is monolithically integrated with a wavelength-selective coupled-ring reflector and semiconductor amplifiers. For realization of a compact size device, deeply etched multi-mode interference couplers and square ring resonators composed of total-internal-reflection mirrors are adopted and fabricated using a self-aligned process. It is demonstrated that the laser diode exhibits single mode operation and 16 nm tuning range with side-mode-suppression-ratio exceeding 20 dB.