Computer-Aided Design of Digital Lightwave Systems

Duff, D.G.

doi:10.1109/jsac.1984.1146032

Cited by 32 publications

(5 citation statements)

References 36 publications

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“…According to , these two types of dispersion act independently and, hence, can be processed separately. Modal dispersion : Personick has shown that if a multimode fiber has sufficient mode mixing, the MMF modal transfer function can be considered as Gaussian . This transfer function is expressed in terms of the RF signal frequency f and the MMF bandwidth × distance product B M as follows:

H_{M} (f) MathClass-rel= e^{(MathClass-bin- \ln (2) f^{2} MathClass-bin∕ {(B_{M} {(1 MathClass-bin∕ L)}^{γ})}^{2})}

where L is the fiber length and γ is the cutback factor that takes into account the mode coupling, the mixing, and the concatenation effects.This basic model is only valid for particular cases where a source of low coherence or a non‐coherent source is used, such as the superluminescent diode or the light‐emitting diode.…”

Section: The Co‐simulation Approach and Rof Link Modelingmentioning

confidence: 99%

“…According to [20], these two types of dispersion act independently and, hence, can be processed separately. (a) Modal dispersion: Personick has shown that if a multimode fiber has sufficient mode mixing, the MMF modal transfer function can be considered as Gaussian [21][22][23]. This transfer function is expressed in terms of the RF signal frequency f and the MMF bandwidth distance product B M as follows:…”

Section: The Vcsel Transmitter Modelmentioning

confidence: 99%

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Co‐simulation‐based modeling and performance analysis of hybrid fiber–wireless links

Chettat

Simohamed

Algani

et al. 2011

Int J Communication

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SUMMARYWe present a new approach for the performance analysis of hybrid fiber/wireless communication systems. This approach is based on a co‐simulation using two types of dedicated software: the first is used for RF/wireless systems whereas the second is devoted to optical communication systems. The proposed method enables simultaneous simulation of all elements of the radio‐over‐fiber link with accurate modeling. A low‐cost wireless local area network over a fiber distribution system is implemented in order to validate the results experimentally. Simulation results are in good agreement with experimental measurements in terms of EVM evolution for different link element configurations. Copyright © 2011 John Wiley & Sons, Ltd.

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H_{M} (f) MathClass-rel= e^{(MathClass-bin- \ln (2) f^{2} MathClass-bin∕ {(B_{M} {(1 MathClass-bin∕ L)}^{γ})}^{2})}

Section: The Co‐simulation Approach and Rof Link Modelingmentioning

confidence: 99%

Section: The Vcsel Transmitter Modelmentioning

confidence: 99%

Co‐simulation‐based modeling and performance analysis of hybrid fiber–wireless links

Chettat

Simohamed

Algani

et al. 2011

Int J Communication

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“…It determines the degree to which the input signal can be linearly distorted during propagation. For SMF's, a formula of the baseband power transfer function was previously derived and can be expressed as [18], [19] ( 6) where is the length of fiber, the angular baseband frequency, is the fiber loss at position , and is the propagation delay per unit length. Relation (6) is valid within the assumption that the electrical angular frequency is much smaller that the optical angular frequency , and is also much smaller than the spectral frequency range .…”

Section: A Formulation For Fiber Dispersion Analysismentioning

confidence: 99%

“…The power flow in propagated modes is best described by the following partial differential equation incorporating not only modal velocities, but also distributed loss and mode-conversion effects [12], [22] ( 17) where is the mode coupling coefficient normalized to , and is the modal attenuation (in the absence of coupling effect). We will suppose the total power at position to be normalized such a way that (18) Equation (17) is in principle invalid when the mode parameter reaches its extremities corresponding to the lowest and highest order modes. These are described by the so-called boundary conditions that will be specified further.…”

Section: Modal Transfer Functionmentioning

confidence: 99%

Comprehensive theory of dispersion in graded-index optical fibers

Yabre

2000

J. Lightwave Technol.

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Abstract-This paper presents a theoretical investigation on the dispersion in graded-index silica glass fibers under overfilled launching with equal excitation of modes. This theory incorporates both chromatic effect and modal contribution which takes not only the modal delay into account but also the distributed loss and mode-coupling. Random microbends are considered to be the most dominant source of coupling. All index perturbations and intrinsic core diameter variations are assumed to be negligible, but they could readily be included without changing the basic structure of the model. The 3-dB bandwidth is analyzed through the study of the fiber transfer function which introduces the wavelength and modal effects as two separate filter functions. The formal derivation of the chromatic transfer function is analytical. On the other hand, the modal transfer function is obtained by numerically solving the power flow equation in the frequency domain using Crank-Nicholson method. As an application, the results are illustrated showing, in particular, the influence of the fiber core/outside diameters, for the first time.

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“…In single mode fiber only chromatic dispersion is present. No intermodal dispersion is there [5]. Simulation of the Receiver The detector we used is Avalanche photodiode.…”

Section: Extended Abstractmentioning

confidence: 99%

Performance of fiber optic CDMA LANs with less-than-ideal components

Kar¹,

Ramakrishnaiah²,

De³

1998

SPIE Proceedings

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Extended AbstractWe investigate the performance of CDMA. systems with laser chirping effects, single mode fiber dispersion effect and by assuming a Poisson shot noise model for an APD receiver. We develop the time-domain simulation models for the functional blocks in CDMA LANs and evaluate the end-to-end system performance using these models. The use of direct sequence CDMA LANs attracts attention due to the improved usage of the bandwidth of the optical fiber [1] [2] . We investigate the effect of using non-ideal components (sources, medium, detectors) on the performance of such a CDMA fiber-optic LAN. In our simulation the system comprises of the following signal processing blocks-Data source (NRZ) , Electrically programmable encoder, Laser, Optical encoder and decoder, Single mode fiber and Receiver.Simulation of Laser The direct current modulation of single-longitudinal mode semiconductor lasers causes a dynamic shift of the peak emission wavelength. The magnitude of the chirping induced performance degradation increases with the transmission bit rate and can ultimately limit achievable system performance [3] The injected laser current which is given by 1(t) = k=oo .'bias + k=-oo Ak * 1p (t -kT) where 'bias IS the bias current, the sequence Ak denotes the independently distributed data values, T is the signaling rate and 4, (t)is the applied current pulse. The optical power and the chirping response of the semiconductor laser to the current waveform 1(i) is determined by means of the large signal rate equations, which describe the interrelationship of the photon density , carrier density , and optical phase within the laser cavity.o{Fg0(N(t) -N0) --}where N(t) -electron density, 5(t) -photon density, g0 -differential gain, N0 -carrier density for transparency, r , T -electron & photon lifetime respectively, 1(t) -input current, V -volume of active layer, e -electron charge, 4 -the optical phase, F -the mode confinement factor, /3 -is the fraction of spontaneous emission coupled in the lasing mode, c -linewidth enhancement factor and -the gain compression factor. The time variation for the optical power and laser chirp are given by power(t) = 052' riohv , 1 respectively where hii is the photon energy at the frequency 1-' and ijo is the differential quantum efficiency.

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Computer-Aided Design of Digital Lightwave Systems

Cited by 32 publications

References 36 publications

Co‐simulation‐based modeling and performance analysis of hybrid fiber–wireless links

Co‐simulation‐based modeling and performance analysis of hybrid fiber–wireless links

Comprehensive theory of dispersion in graded-index optical fibers

Performance of fiber optic CDMA LANs with less-than-ideal components

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