Linearity Characterization of Connectorized Laser Diodes Under Microwave Intensity Modulation by AM/AM and AM/PM Measurements

Way, W.I.; Afrashteh, A.

doi:10.1109/mwsym.1986.1132274

Cited by 17 publications

(25 citation statements)

References 5 publications

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“…The AM -AM/PM characteristics are valid provided that the device "memory time" (amplitude -and frequency-dependent time delay between the transmitted and received RF signal) is much smaller than the reciprocal of the input signal bandwidth [18]. As a rule of thumb, the AM-AM/PM models are used when the memory time of the nonlinear system is at least twice less than the reciprocal of the envelope frequency [19,20]. This criterion is satisfied in this research.…”

Section: Optical Subsystemmentioning

confidence: 99%

On the Equalization of an OFDM-Based Radio-over-Fiber System Using Neural Networks

Safari¹,

Baghersalimi²,

Kiani³

2017

RADIOENGINEERING

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Section: Optical Subsystemmentioning

confidence: 99%

On the Equalization of an OFDM-Based Radio-over-Fiber System Using Neural Networks

Safari¹,

Baghersalimi²,

Kiani³

2017

RADIOENGINEERING

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“…The models are valid when the device Òmemory timeÓ (amplitude-and frequency-dependent time delay between the transmitted and received RF signal) is much smaller than the reciprocal of the input signal bandwidth [16]. In other words, these characteristics can be used only when the nonlinear system is treated as a quasi-memoryless system [17].…”

Section: B Optical Subsystemmentioning

confidence: 99%

“…In other words, these characteristics can be used only when the nonlinear system is treated as a quasi-memoryless system [17]. As a rule of thumb, the AM-AM/PM models are used when the memory of the nonlinear system is at least twice less than the reciprocal of the envelope frequency [16,18]. This condition is met in this study.…”

Section: B Optical Subsystemmentioning

confidence: 99%

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Baghersalimi¹,

O’Farrell²

2013

IET Communications

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AbstractÑIn this paper the impact of a Radio over Fibre (RoF) subsystem on the capacity performance of Wideband Code Division Multiple Access (WCDMA) is evaluated. The study investigates the use of pilot aided channel estimation to compensate for the optical subsystem nonlinearities for different channel conditions, estimation intervals, and coding schemes. The results show that pilot aided channel estimation is an effective method for compensating the composite impairments of the optical subsystem and the RF channel. It is found that there is always a suitable pilot power level which maximises the system capacity performance regardless of coding scheme and channel condition. Also, the peak capacity is only slightly affected by a decrease in the estimation interval.

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“…Intermodulation distortion has a deep influence on the quality of the received signal, and needs to be known accurately in order to evaluate the performance of the optical system. In a previous work [7], the authors experimentally measured the 3 rd -order intermodulation distortion (IMD3) of an RoF subsystem under microwave-intensity modulation. Furthermore, an analytical approach was also proposed to determine the abovementioned distortion.…”

mentioning

confidence: 99%

“…The optical system was a back-to-back high-speed GaAIAs laser diode (Ortel LDS10-PMF) and PIN diode (Ortel PD050-PM), both with 1-m multimode pigtails and biconic connectors. However, although two groups of experimental results were carried out in [7], the results obtained by using a laser diode with a threshold current of 19.5 mA and saturated at around 70 mA is used in this study. Finally, an HP 8566 B spectrum analyzer was used to measure the IMD3 levels [7].…”

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confidence: 99%

Application of multilayer perceptron networks to laser diode nonlinearity determination for radio‐over‐fibre mobile communications

Develı

2004

Micro & Optical Tech Letters

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(15°) at xЈ ϭ 9 (the pulse extends from xЈ ϭ ϩ9 to ϩ10) and Ϫ/18 at xЈ ϭ Ϫ10 (the pulse extends from xЈ ϭ Ϫ10 to Ϫ9). MEASUREMENT FOR A SIX-ELEMENT LINEAR COUPLED OSCILLATORS ARRAYOn a 0.508-mm-thick dielectric substrate with a relative dielectric constant of 3.0, a six-element coupled-oscillator array was fabricated with a commercially available packaged VCO operating at a selected ensemble frequency of 2.32 GHz (shown in Fig. 3). The measured and calculated phase distributions from the continuous dynamics with 16°coupling-phase adjustments for the coupling circuits between two oscillators, numbered 1 and 2 and between 5 and 6 in opposite signs, are shown in Figure 4. The coupling circuits were designed using varactor-tuned reflection-type phase shifters with branchline hybrid in series with 50⍀ resistors. A method of measuring the phase difference between adjacent oscillators using the Agilent network analyzer 8753D is used and output observation is done through the coupled ports of 15-dB directional couplers followed by VCOs and coupling circuits. There is a good agreement between two cases within the error range of Ϯ6.4°. CONCLUSIONIn this paper, we have evolved the continuous dynamics for a coupled-oscillator array using a coupling-phase adjustment presented by J. H. Hwang and N. H. Myung in [4] and have verified it by fabricating a six-element linear array operating at the nominal frequency of 2.32 GHz and by measuring the relative phase difference between adjacent oscillators at steady state in comparison with the calculated one. From the continuous dynamics, we can achieve definite and clear insight into the behavior of the array and predict a phase distribution across the array with a small phase adjustment of the peripheral coupling circuit in the array. Our goal is to implement a 2D coupled-oscillator array with a couplingphase adjustment. This work is anticipated to support the design of an array for spatial beam-scanning applications. ACKNOWLEDGMENTSThis work was supported by the MICROS Research Center at KAIST and the EMERC Research Center at CNU (Chungnam National University). INTRODUCTIONWith the increasing demand for broadband services, it is expected that the radio-over-fibre (RoF) technology may be employed to provide high-capacity mobile communication networks. The major advantages of the transmission of millimeter-wave signals over fibre are low attenuation loss and large bandwidth, as compared to the transmission on conventional coaxial cables [1,2]. Some of the applications of RoF technology include mobile radio communications, satellite communications, local multipoint distribution services [3], broadband-access radio, and indoor wireless LANs over optical networks [4].There are several techniques for distributing and generating microwave signals via optical fibre. The simplest method for the generation of radio signals for transmission through an optical network is to directly modulate the light source with the received electrical signal. Direct modulation of the laser can lead to a numb...

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Linearity Characterization of Connectorized Laser Diodes Under Microwave Intensity Modulation by AM/AM and AM/PM Measurements

Cited by 17 publications

References 5 publications

On the Equalization of an OFDM-Based Radio-over-Fiber System Using Neural Networks

On the Equalization of an OFDM-Based Radio-over-Fiber System Using Neural Networks

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Application of multilayer perceptron networks to laser diode nonlinearity determination for radio‐over‐fibre mobile communications

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