Applications of O-band semiconductor optical amplifiers in fibre-optic telecommunication networks

Optical ??bre communication is an essential part of modern telecommunication networks. Research activities are aiming to transport and switch information streams through optical ??bre networks most e??ciently. This thesis is devoted to applications of 1310 nm semiconductor optical ampli??ers (SOAs) in ??bre optic telecommunication networks. The basic application of 1310 nm SOAs is the ampli??cation of optical signals. In this thesis dense wavelength division multiplexed SOA based transmission in the 1310 nm wavelength domain is investigated. The 1310 nm SOAs allow high speed (10-40 Gbit/s) transmission over metro range distances (50-200 km) without any dispersion compensation in standard single-mode ??bre based networks. This is important for access and metro systems, where the system cost is shared by the limited number of users. To alleviate optical-electrical-optical conversion at the interface point between access-metro and core networks a novel wavelength conversion technique is proposed. Nonlinear polarization rotation in the 1310 nm SOA permits the realization of 1310- to-1550 nm wavelength conversion and the aggregation of multiple data streams in the 1310 nm wavelength domain into one time interleaved data stream in the 1550 nm wavelength domain. By utilizing the 1310 nm SOA in a gain transparent con??guration an all-optical optical time domain multiplexed add-drop switch was realized. The proposed adddrop switch was widely tested in the laboratory and ??eld transmission experiments allowing 160 Gbit/s transmission over 550 km of standard single-mode ??bre and the realization of a fully functional 160 Gbit/s optical time domain multiplexed network. Based on this research it is concluded that 1310 nm SOAs are versatile components which support essential transmission and switching functionalities with great opportunities for utilization in advanced telecommunication networks

Transmission impairments due to four-wave mixing in the 1310 nm window

High speed optical transmission in the 1310 nm window might have a potential for ACCESS and METRO applications considering the restricted distances and the virtual absence of dispersion related system penalties. On the other hand Four-Wave Mixing (FWM) is expected to play a major role in WDM transmission. The effects of FWM has been evaluated in a four channel 10 Gbit/s WDM experiment with 100 GHz channel spacing over 100 km Standard Single Mode Fibre employing semiconductor optical amplifiers (SOA’s) as a booster, in-line and preamplifier. Successful suppression of FWM penalties was achieved by using an unequal spaced channel allocation scheme

Towards 1 Tbit/s SOA based 1310 nm transmission for LAN/Data Center Applications

The growing data traffic in the local area networks (LAN) is driving development of the cost-effective transmission systems that can carry it cost-efficiently. In this paper we propose and demonstrate the 1310 nm dense-wavelength-division multiplexed and polarization multiplexed transmission system. The demonstrated n×2×40 Gbit/s transmission system is based exclusively on semiconductor components without any form of the chromatic dispersion compensation or error-correction. Results of the conducted experiments show the excellent error-free 8×2×40 Gbit/s all-semiconductor transmission over 25 km of standard single-mode fiber. The demonstrated transmission system can be utilized to realize ultra-high speed connections like the next generation 400 Gbit/s and 1 Tbit/s Ethernet

The raman amplifier in low-complexity PolMux DWDM 1310 nm transmission

In this paper, we experimentally investigate the impact of the Raman amplifier on the transmission quality in the high capacity and low complexity polarization multiplexed and dense wavelength division multiplexed transmission system in the 1310 nm wavelength domain. We compare its performance with the same system utilizing the semiconductor optical amplifier. Conducted experiments show that in the presented 1310 nm 8×2×40 Gbit/s transmission system, with the transmission line consisting of 25 km standard single mode fibre, the Raman amplifier can be successfully applied and its utilization leads to the 4 dB improvement of the average channel sensitivity in comparison with the system with a semiconductor optical amplifie

Remote access unit for optic-to-wireless conversion

In this paper we propose a design of a reconfigurable Remote Access Unit (RAU) interfacing optical dense wavelength division multiplexed (DWDM) networks with radio communication links. To generate a radio signal the device utilizes aprinciples of incoherent heterodyne signal upconversion. The proposed RAU is able to operate in a whole optical C-band with 100GHz spaced channels and can generate radio signals in a wide frequency range limited only by used photodiode. Experimental tests of the RAU showed error free operation after 15km of fiber and 50m of radio link in W-band frequency range. Growing demand for high speed wireless data transmission and new wireless standards like 5G force network operators to find new solutions for backhaul networks. Presently, to meet this need, attention of many researchers and top network vendors has been directed towards millimeter wave radio links. Operation in the millimeter wave range brings new possibilities for a channel allocation as well as allows wider radio channels to be used. Moreover this frequency range is lighter licensed than regular GSM. This clearly shows a huge potential of millimeter waves for a high speed wireless data transmission. Nevertheless operation in the millimeter wave range struggles with one problem – traditional generation of signals in this frequency range is complex. To overcome this issue and provide simple integration of radio networks with present and future optical networks use of optical heterodyne signal upconversion was proposed and research projects like IPHOBAC-NG were founded. The aim of the mentioned project is to employ novel RAUs featuring opticto-wireless and wireless-to-optic conversion with a speeds of 1-10Gbit/s for broadband wireless access and up to 3Gbit/s for mobile backhaul. The RAU proposed in this paper is in line with these assumptions.The principle of operation of the proposed RAU is as follow: when DWDM signal enters RAU a desired data channel is selected with a widely tunable fiber Fabry-Perot optical filter. Next signal is combined with a reference signal from a local oscillator spaced accordingly to the chosen radio frequency. Both signals are fed into a photodiode with 90GHz bandwidth and transmitted with antenas. The local oscillator and tunable filter are controlled over processing unit that can be easily connected to the management network. The filter and local oscillator are widely tunable what brings broad range of possible configurations. Tests in real-likely conditions showed great RAU's performance and allowed wireless transmission with the bit error rate at the level of 1-10

A novel data vortex switch for photonic slot routing

A Data Vortex switch with improved latency and no-contention property is proposed for photonic slot routing. Electro-absorption modulator technology is experimentally shown to be a promising solution for implementing compact and fast-speed operation Data Vortex switches

Dispersion tolerant radio-over-fibre transmission of 16 and 64 QAM radio signals at 40 GHz

Generation of a 39.9 GHz microwave carrying 16 and 64 QAM radio signals up to 20 MS/s, exploiting FM-IM conversion through a periodic bandpass filter, is demonstrated. The dispersion tolerance of the approach is also investigated

Carrierless amplitude phase modulation of VCSEL with 4 bit/s/Hz spectral efficiency for use in WDM-PON

We experimentally demonstrate successful performance of VCSEL-based WDM link supporting advanced 16-level carrierless amplitude/phase modulation up to 1.25 Gbps, over 26 km SSMF with spectral efficiency of 4 bit/s/Hz for application in high capacity PONs. © 2011 Optical Society of America

Error-free all-optical add-drop multiplexing using HNLF in a NOLM at 160 Gbit/s

The capability of a highly-nonlinear fibre (HNLF) as the phase shifting element in a nonlinear optical loop mirror (NOLM) for all-optical adding/dropping optical time domain multiplexed (OTDM) channels has been demonstrated. Error-free add/drop operation of 40 Gbit/s base rate channels from a 160 Gbit/s OTDM signal has been achieved

Digitized radio-over-fiber transceivers for SDM/WDM back-/front-haul

\u3cp\u3eIn this paper we analyze the perspective of digitized radio over fiber (DRoF) fronthaul, showing how to meet the requirements to cope with the future radio access networks (RANs). This entails the introduction of space division multiplexing (SDM) while increasing the flexibility and capacity of the DRoF transceivers.Since the evolution of the DRoF fronthaul is being revised and re-defined, in the blueSPACE project we propose two different DRoF transceiver options. The first option consists on simple transceiver, based on the recent standard specifications and, therefore, expected to be deployed in the short-term. The second options is a more advanced transceiver that features high flexibility, relying on a strong DSP and targeting a long-term deployment. Besides a basic characterization of both solutions, we also analyze additional aspects related to the design and implementation of these two DRoF solutions and their integration into an SDM based RAN. This includes the programmability and interaction with the control plane.\u3c/p\u3