Modulation characteristics of a laser-diode hybrid-integrated into a ceramic multilayer module for radio-over-fiber applications

Mathew, Sumy; Welker, Tilo; Gutzeit, Nam; Spira, Steffen; Stephan, Ralf; Müller, Jens; Hein, Matthias

doi:10.23919/eumc.2017.8230925

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…9b, which includes a small-signal equivalent circuit model for the VCSEL at a bias current of 6 mA, such that validation of the measurement is possible. Specifically, the model proposed in [45] was used. A resistance of 93.7 Ω in parallel with a capacitance of 142.3 fF represents the junction, while the series resistance of 25.4 Ω represents the metal contacts and the resistance of the Bragg mirror stack [46].…”

Section: B Optoelectronic Conversion Circuitmentioning

confidence: 99%

“…A parasitic inductor of 290.9 pH, arising from the contacts, is added in series. The model proposed in [45] includes additional parasitic components as well as an additional inductor, but these prove to be negligible at a modulation frequency up to 4 GHz. Finally, a 50 Ω transmission line with an electrical length of 52.3…”

Section: B Optoelectronic Conversion Circuitmentioning

confidence: 99%

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Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Caytan

Bogaert

et al. 2018

J. Lightwave Technol.

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Abstract-A novel remote antenna unit, intended for application in the downlink of an analog radio frequency over fiber system, is proposed, whose radiated power originates entirely from the optical signal supplied by a single multi-mode fiber. By operating the photodetector of the optical receiver at zero bias voltage, while omitting typical active components, such as transimpedance amplifiers, a fully passive unit, requiring no external power supply, is obtained. Instead, a careful co-design is performed to maximize the power transfer from photodetector to antenna within the frequency range of interest using an impedance matching network. A wideband cavity-backed slot antenna is implemented in air-filled substrate-integrated-waveguide technology. The antenna feed plane serves as integration platform for the optical receiver. The resulting downlink remote antenna unit is compact, cost-effective, energy-efficient and extremely reliable. Therefore, it is an ideal building block for novel, highly specialized, ultra-high density wireless communication systems, which require massive amounts of remote antenna units, deployed in attocells as small as 15 cm ×15 cm. A prototype operating in a wide frequency bandwidth ranging from 3.30 GHz to 3.70 GHz is constructed and validated. In free-space conditions, a broadside gain of −0.2 dBi, a front-to-back ratio of 8.8 dB and linear polarization with a cross-polarization level of −28.8 dB are measured at 3.50 GHz. Furthermore, a −3 dB gain bandwidth of 500 MHz is observed. Finally, the prototype is deployed in a unidirectional data link, achieving a symbol rate of 80 MBd over a distance of 20 cm.

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Section: B Optoelectronic Conversion Circuitmentioning

confidence: 99%

Section: B Optoelectronic Conversion Circuitmentioning

confidence: 99%

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Caytan

Bogaert

et al. 2018

J. Lightwave Technol.

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“…To ensure the orthogonal polarization between two channels, polarization controller (PC) is used. PC is used to rotate the polarization angle of channel . The two channels are polarization multiplexed using polarization multiplexer (PMX).…”

Section: Principle Of Operationmentioning

confidence: 99%

“…PC is used to rotate the polarization angle of channel. 14 The two channels are polarization multiplexed using polarization multiplexer (PMX). The polarization multiplexed signal is fed to single mode fiber (SMF UP ) to the BS for uplink.…”

Section: Uplink Sectionmentioning

confidence: 99%

Coherent full duplex radio over fiber system with multiple signal transmission

Chandrasenan

Zacharias

2018

Micro & Optical Tech Letters

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In this paper, a cost‐effective and simple full duplex RoF (radio over fiber) system is developed from a simplex coherent RoF. At the transmitter, utilizing the magnitude and phase of the vector carrier, four different information are encoded simultaneously on the carrier light wave. Dividing the total carrier power into two branches, enable the transmitter to modulate two distinct information on each branch. The working of the system is described in two main sections namely uplink section and downlink section. In the first section, encoding of uplink transmitting information and decoding downlink information at the central office (CO) is described. In the second section, modulating downlink transmitting information and demodulating coherently the uplink receiving information at the base station (BS) are described. An algorithm based on fast Fourier transform is described for effectively canceling the phase noise (PN) at the BS. Considering the cost of optical components, the source used to coherently detect the uplinked transmitted information, is again used as the carrier for downlink. Altogether, this system enables to transmit three different information on uplink and are faithfully received at the BS with an average of log(BER) value −23 dB. And for downlink, one information is transmitted and is successfully received at the CO with log(BER) of −9 dB. About 10 dB decrease in log(BER) values was found after the cancellation of PN.

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Design and analysis of full duplex RoF system with efficient phase noise cancellation from a coherent RoF system

Chandrasenan¹,

Zacharias²

2021

Journal of Optical Communications

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A energy efficient and high throughput bi directional radio over fiber (RoF) system is designed and analysed. In order to preserve the phase and the magnitude of the transmitted signals, coherent detection (CD) is employed and hence an optical local oscillator (OLO) source is used. A full duplex system is designed by utilising the same OLO. The phase noise in CD system is logically cancelled using digital signal processing techniques. 10 Gb/s 16-QAM at 5.5 GHz, 10 Gb/s 2-QAM at 2.5 GHz , 5 Gb/s QPSK at 5.5 Ghz and 10 Gb/s 4-QAM at 7.5 GHz are transmitted simultaneously over 25 km optical fiber(OF). It is analysed that any coherent RoF system can be designed to a full duplex system with acceptable log(BER) and error vector magnitude(EVM) values. The minimum values of log(BER) values obtained for 16-QAM, QPSK, 2-QAM and 4-QAM are −10, −8, −16 and −22, respectively.

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Modulation characteristics of a laser-diode hybrid-integrated into a ceramic multilayer module for radio-over-fiber applications

Cited by 4 publications

References 11 publications

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Passive Opto-Antenna as Downlink Remote Antenna Unit for Radio Frequency Over Fiber

Coherent full duplex radio over fiber system with multiple signal transmission

Design and analysis of full duplex RoF system with efficient phase noise cancellation from a coherent RoF system

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