Linearity Enhancement of a Directly Modulated Uncooled DFB Laser in a Multi-Channel Wireless-over-Fibre Systems

Ismail, T.; Mitchell, John E.; Seeds, A.J.

doi:10.1109/mwsym.2005.1516506

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…When a laser is used, it can be directly modulated with UL data [74,75] or an external modulation scheme can be selected. For the laser-free configuration, the CS provides the optical tone for UL transmission.…”

Section: Ne14: Ul Transmitter At the Bsmentioning

confidence: 99%

Knowledge-based framework for the design of millimeter-wave (60 GHz) radio over fiber land networks

et al. 2015

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This paper presents the research work involved in the development of a knowledge-based framework for the design of millimeter-wave 60 GHz radio over fiber (RoF) land networks. It combines object-oriented, rule-based, technical information, and procedural functions to support engineers in the conceptual and preliminary design of a network. The overall framework is organized in two main modules: the first module is a tutorial of the terminology and basic principles in the design of RoF networks. The second module is a design assistant system that requests input data from the user about the functional network requirements and its prioritized figures of merit. The proposed design assistant is capable of providing support on the major activities of the 60 GHz RoF land network design such as downlink and uplink channel assignment and network clustering, wavelength allocation, optical link design, and network integration. The assistant is user interactive through the implementation of a graphical user interface. To illustrate the validation of such framework, we present a case of study of a network design with specific requirements.

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Section: Ne14: Ul Transmitter At the Bsmentioning

confidence: 99%

Knowledge-based framework for the design of millimeter-wave (60 GHz) radio over fiber land networks

et al. 2015

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“…The proportion of noise coupled to the output depended on the coupling ratio of the optical coupler 2 and this could be minimised by using a coupler which has a coupling ratio of 10 dB or more. T. Ismail, et al [11], presented the effectiveness of the feedforward linearisation system in suppressing spectral re-growth caused by a directly modulated uncooled DFB Laser for the transmission of multichannel 3.5 MSymb/s QPSK modulated wireless signal centered around 2.4 GHz in a fibre ring distribution architecture at the Base Station. A reduction of intermodulation distortion was achieved when two strong channel are at +12 dBm input level.…”

Section: Experimental Progressmentioning

confidence: 99%

A review for development of feedforward linearisation system on radio over fiber links

Alifah¹,

Idrus²,

Kassim³

2008

2008 IEEE International RF and Microwave Conference

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Radio over fiber technology provides the efficient and cost effective solution for increased bandwidth demand in wireless area but suffer from performance degradation due to optical transmitter nonlinearity that generates distortion of inband, harmonic and intermodulation in modulating RF signal. A feedforward linearisation is a powerfull technique that prefers because can reduce the broadband distortion in microwave/millimeter wave frequencies, reduce the all orders of distortion and the laser relative intensity noise (RIN) simultaneously. This paper reviewed the research progress of feedforward linearisasion system in radio over fiber application. Feedforward linearisation system was reported that can suppress third-order intermodulation distortion (IMD3) from 10 -20 and RIN reduction from 1 -10 dB simultaneously at operating frequency from 0 -5 GHz with linearization bandwidth 500 -850 MHz. The highest operating frequency is 5.2 GHz with 10 dB IMD3 reduction on 500 MHz linearization bandwidth. Therefore, feedforward linearisation system can improved the RoF performance by linearity impovement so that the system can operate at broadband frequency

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“…To provide large area network coverage such as at an airport, RF modulated optical signals are generated at the central station and distributed to remote base stations without significant loss using optical fiber and reach the mobile user via RF transmission allowing mobility [1]. Since multiple RF carriers are multiplexed together and transmitted through optical links, undesired inter-modulation distortion products (IMD) or four wave mixing (FWM) are produced due to nonlinear devices, such as laser diode, Mach-Zehnder Modulator, optical amplifier and etc.…”

Section: Introductionmentioning

confidence: 99%

Optical predistortion feedback linearization for suppressing the nonlinearity in optical amplifier

Tabatabai

Al-Raweshidy

2008

2008 Asia-Pacific Microwave Conference

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Linearity Enhancement of a Directly Modulated Uncooled DFB Laser in a Multi-Channel Wireless-over-Fibre Systems

Cited by 7 publications

References 5 publications

Knowledge-based framework for the design of millimeter-wave (60 GHz) radio over fiber land networks

Knowledge-based framework for the design of millimeter-wave (60 GHz) radio over fiber land networks

A review for development of feedforward linearisation system on radio over fiber links

Optical predistortion feedback linearization for suppressing the nonlinearity in optical amplifier

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