Wavelength stable uncooled fibre grating semiconductor laser for use in an all optical WDM access network

Campbell, Robert; Armitage, J.R.; Sherlock, G.; Williams, Doug; Payne, Roger; Robertson, M.J.; Wyatt, R.

doi:10.1049/el:19960075

Cited by 48 publications

(9 citation statements)

References 5 publications

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“…It has been found that the bistability, multistability, mode hopping-induced instability, and continuous frequency tuning range of the ECSL are dependent on the reflectivity value of the ARC of laser [40]. Also, it has been shown that by reducing the reflectivity value of the ARC as low as possible, the system performance can be improved [41]. Figure 11 shows the effect of reflectivity value of the ARC on RIN and FN spectra.…”

Section: Resultsmentioning

confidence: 99%

Optimizing the external optical cavity parameters for performance improvement of a fiber grating Fabry–Perot laser

Hisham

Abas

Mahdiraji

et al. 2015

Opt Rev

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The effects of the external optical cavity parameters (external optical cavity length (L ext ), amplitude coupling (C o ) and anti-reflection coating (ARC) reflectivity coefficients) on the noise and modulation spectra of a fiber grating Fabry-Perot laser are numerically analyzed for designing a laser that operates in strong feedback regime (Regime V). Fiber Bragg grating (FBG) is used as a wavelength selective element to control the properties of the laser output by controlling the external optical feedback (OFB) level. The study is performed by modifying a set of rate equations that are solved by considering the effects of external OFB and ambient temperature (T) variations. We proposed a model to calculate the temperature dependence (TD) of laser characteristics according to the TD of laser parameters. An accurate analytical expression for the TD of threshold carrier density (N th,fe ) has been derived. The TD of N th,fe was calculated according to the TD of laser cavity parameters instead of using well-known empirical Pankove relationship via the use of characteristics temperature (T o ) and current (I o ). Results show that the optimum external fiber length (L ext ) is 3.1 cm. Also, it is shown that ARC with reflectivity value of 1 9 10 -2 is sufficient for the laser to operate at low noise, good modulation response, and low fabrication complexity.

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Section: Resultsmentioning

confidence: 99%

Optimizing the external optical cavity parameters for performance improvement of a fiber grating Fabry–Perot laser

Hisham

Abas

Mahdiraji

et al. 2015

Opt Rev

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“…We choose the lowered level of the current density so that the output power decreases by 10 dB, and our parameters are such that this never drops the diode below medium threshold. In a directly modulated laser system, lowering the current below threshold would force the system to build up again from spontaneous emission noise, which is not described by the original PDE's (1) and (2). The rise and fall of the normalized current density and input electric field is modeled by a ninth-order polynomial.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…We begin our analysis with the usual phenomenological equations that describe the electric field and carrier density in semiconductor active media [10], [14], [15] (1) (2) where is the electron-hole (carrier) density with transparency value and and are slowly varying envelope functions describing the forward-and backwardpropagating field amplitudes, respectively, where the total electric field is written as (3) where is the frequency of the incoming field and is the corresponding wavenumber in the passive structure. The group velocity in the absence of pumping is denoted by is the differential gain, is the fraction of the mode volume occupied by the gain medium, and is the parameter describing gain compression, an effect usually attributed to carrier heating or spectral hole burning [14], [16].…”

Section: Phenomenological Equationsmentioning

confidence: 99%

“…We denote the length of the gain medium by . Since in this paper we are focusing on field and carrier density dynamics of the diode only above the gain medium threshold, we have neglected noise sources in (1) and (2). We define effective photon densities associated with the forward-and backwardpropagating beams as where is the background index of refraction in the semiconductor.…”

Section: Phenomenological Equationsmentioning

confidence: 99%

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Dynamical model of directly modulated semiconductor laser diodes

Ramunno

Sipe

1999

IEEE J. Quantum Electron.

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We present a new dynamical model for a directly modulated semiconductor diode, applicable to systems in which the dynamical time scales of interest are longer than the roundtrip time of light in the diode. Employing a multiple scales analysis to simplify the familiar phenomenological equations, we find that the dynamical response of the diode can be described by time-dependent reflection and transmission coefficients for the electric field and one ordinary differential equation for the integrated carrier density. We do not assume that the photon and carrier densities are uniform along the diode and do not need to calculate them explicitly at each point. Additionally, we need not restrict ourselves to only a small-signal response. We justify the multiple scales analysis for parameters corresponding to typical structures through a comparison of the numerical solution of our results and a direct numerical integration of the original phenomenological equations.

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“…DDS is a new frequency synthesis technique which starts from the concept of phase and directly synthesis waveforms required [3]. The principle is shown in Fig.…”

Section: The Principle Of Ddsmentioning

confidence: 99%

Design and Simulation of an Optimized DDS

Wang

Zhong

2010

2010 International Conference on Computational Intelligence and Software Engineering

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In this paper, an improved design of direct digital synthesizer (DDS) based on the traditional frequency synthesizer theory is put forward. To achieve 32-bit DDS design, FPGA StatixⅡseries chip is used. Besides, it has proposed 1/4 look-up table compression, phase jitter injection and other optimization methods. Moreover, error sources of the DDS spectrum spurious output is analyzed. Experimental results show that the improved DDS can generate sine wave with high precision, meanwhile the spurious free dynamic range can achieve 93dB, which improves nearly 10 dB compared with that of unimproved DDS.

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Wavelength stable uncooled fibre grating semiconductor laser for use in an all optical WDM access network

Cited by 48 publications

References 5 publications

Optimizing the external optical cavity parameters for performance improvement of a fiber grating Fabry–Perot laser

Optimizing the external optical cavity parameters for performance improvement of a fiber grating Fabry–Perot laser

Dynamical model of directly modulated semiconductor laser diodes

Design and Simulation of an Optimized DDS

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